__gnu_parallel(3)__gnu_parallel(3)NAME__gnu_parallel-
GNU parallel code for public use.
SYNOPSIS
Classes
struct _Settings
class _Settings Run-time settings for the parallel mode, including
all tunable parameters.
struct accumulate_binop_reduct
General reduction, using a binary operator.
struct accumulate_selector
std::accumulate() selector.
struct adjacent_difference_selector
Selector that returns the difference between two adjacent elements.
struct adjacent_find_selector
Test predicate on two adjacent elements.
struct balanced_quicksort_tag
Forces parallel sorting using balanced quicksort at compile time.
struct balanced_tag
Recommends parallel execution using dynamic load-balancing at
compile time.
class binder1st
Similar to std::binder1st, but giving the argument types
explicitly.
class binder2nd
Similar to std::binder2nd, but giving the argument types
explicitly.
struct constant_size_blocks_tag
Selects the constant block size variant for std::find().
struct count_if_selector
std::count_if () selector.
struct count_selector
std::count() selector.
struct default_parallel_tag
Recommends parallel execution using the default parallel algorithm.
struct DRandomShufflingGlobalData
Data known to every thread participating in
__gnu_parallel::parallel_random_shuffle().
struct DRSSorterPU
Local data for a thread participating in
__gnu_parallel::parallel_random_shuffle().
struct dummy_reduct
Reduction function doing nothing.
class equal_from_less
Constructs predicate for equality from strict weak ordering
predicate.
struct equal_split_tag
Selects the equal splitting variant for std::find().
struct equal_to
Similar to std::equal_to, but allows two different types.
struct exact_tag
Forces parallel merging with exact splitting, at compile time.
struct fill_selector
std::fill() selector.
struct find_first_of_selector
Test predicate on several elements.
struct find_if_selector
Test predicate on a single element, used for std::find() and
std::find_if ().
struct find_tag
Base class for for std::find() variants.
struct for_each_selector
std::for_each() selector.
struct generate_selector
std::generate() selector.
struct generic_find_selector
Base class of all __gnu_parallel::find_template selectors.
struct generic_for_each_selector
Generic selector for embarrassingly parallel functions.
struct growing_blocks_tag
Selects the growing block size variant for std::find().
class guarded_iterator
Iterator wrapper supporting an implicit supremum at the end of the
sequence, dominating all comparisons.
struct identity_selector
Selector that just returns the passed iterator.
struct inner_product_selector
std::inner_product() selector.
class iterator_pair
A pair of iterators. The usual iterator operations are applied to
both child iterators.
class iterator_triple
A triple of iterators. The usual iterator operations are applied to
all three child iterators.
struct Job
One job for a certain thread.
struct less
Similar to std::less, but allows two different types.
class lexicographic
Compare a pair of types lexicographically, ascending.
class lexicographic_reverse
Compare a pair of types lexicographically, descending.
struct loser_tree_traits
Traits for determining whether the loser tree should use pointers
or copies.
class LoserTree
Stable LoserTree variant.
class LoserTree< false, T, Comparator >
Unstable LoserTree variant.
class LoserTreeBase
Guarded loser/tournament tree.
class LoserTreePointer
Stable LoserTree implementation.
class LoserTreePointer< false, T, Comparator >
Unstable LoserTree implementation.
class LoserTreePointerBase
Base class of Loser Tree implementation using pointers.
class LoserTreePointerUnguarded
Stable unguarded LoserTree variant storing pointers.
class LoserTreePointerUnguarded< false, T, Comparator >
Unstable unguarded LoserTree variant storing pointers.
class LoserTreePointerUnguardedBase
Unguarded loser tree, keeping only pointers to the elements in the
tree structure.
class LoserTreeUnguarded
Stable implementation of unguarded LoserTree.
class LoserTreeUnguarded< false, T, Comparator >
Non-Stable implementation of unguarded LoserTree.
class LoserTreeUnguardedBase
Base class for unguarded LoserTree implementation.
struct max_element_reduct
Reduction for finding the maximum element, using a comparator.
struct min_element_reduct
Reduction for finding the maximum element, using a comparator.
struct mismatch_selector
Test inverted predicate on a single element.
struct multiplies
Similar to std::multiplies, but allows two different types.
struct multiway_merge_3_variant_sentinel_switch
Switch for 3-way merging with sentinels turned off.
struct multiway_merge_3_variant_sentinel_switch< true,
RandomAccessIteratorIterator, RandomAccessIterator3, _DifferenceTp,
Comparator >
Switch for 3-way merging with sentinels turned on.
struct multiway_merge_4_variant_sentinel_switch
Switch for 4-way merging with sentinels turned off.
struct multiway_merge_4_variant_sentinel_switch< true,
RandomAccessIteratorIterator, RandomAccessIterator3, _DifferenceTp,
Comparator >
Switch for 4-way merging with sentinels turned on.
struct multiway_merge_k_variant_sentinel_switch
Switch for k-way merging with sentinels turned on.
struct multiway_merge_k_variant_sentinel_switch< false, stable,
RandomAccessIteratorIterator, RandomAccessIterator3, _DifferenceTp,
Comparator >
Switch for k-way merging with sentinels turned off.
struct multiway_mergesort_exact_tag
Forces parallel sorting using multiway mergesort with exact
splitting at compile time.
struct multiway_mergesort_sampling_tag
Forces parallel sorting using multiway mergesort with splitting by
sampling at compile time.
struct multiway_mergesort_tag
Forces parallel sorting using multiway mergesort at compile time.
struct nothing
Functor doing nothing.
struct omp_loop_static_tag
Recommends parallel execution using OpenMP static load-balancing at
compile time.
struct omp_loop_tag
Recommends parallel execution using OpenMP dynamic load-balancing
at compile time.
struct parallel_tag
Recommends parallel execution at compile time, optionally using a
user-specified number of threads.
struct Piece
Subsequence description.
struct plus
Similar to std::plus, but allows two different types.
struct PMWMSSortingData
Data accessed by all threads.
class pseudo_sequence
Sequence that conceptually consists of multiple copies of the same
element. The copies are not stored explicitly, of course.
class pseudo_sequence_iterator
Iterator associated with __gnu_parallel::pseudo_sequence. If
features the usual random-access iterator functionality.
struct QSBThreadLocal
Information local to one thread in the parallel quicksort run.
struct quicksort_tag
Forces parallel sorting using unbalanced quicksort at compile time.
class random_number
Random number generator, based on the Mersenne twister.
struct replace_if_selector
std::replace() selector.
struct replace_selector
std::replace() selector.
class RestrictedBoundedConcurrentQueue
Double-ended queue of bounded size, allowing lock-free atomic
access. push_front() and pop_front() must not be called
concurrently to each other, while pop_back() can be called
concurrently at all times. empty(), size(), and top() are
intentionally not provided. Calling them would not make sense in a
concurrent setting.
struct sampling_sorter
Stable sorting functor.
struct sampling_sorter< false, RandomAccessIterator, StrictWeakOrdering
>
Non-stable sorting functor.
struct sampling_tag
Forces parallel merging with exact splitting, at compile time.
struct sequential_tag
Forces sequential execution at compile time.
struct split_consistently
Split consistently.
struct split_consistently< false, RandomAccessIterator, Comparator,
SortingPlacesIterator >
Split by sampling.
struct split_consistently< true, RandomAccessIterator, Comparator,
SortingPlacesIterator >
Split by exact splitting.
struct transform1_selector
std::transform() selector, one input sequence variant.
struct transform2_selector
std::transform() selector, two input sequences variant.
class unary_negate
Similar to std::binder1st, but giving the argument types
explicitly.
struct unbalanced_tag
Recommends parallel execution using static load-balancing at
compile time.
class void_functor
Functor that does nothing.
Typedefs
typedef unsigned short bin_index
typedef short int16
typedef int int32
typedef long long int64
typedef int64 lcas_t
typedef uint64 sequence_index_t
typedef uint16 thread_index_t
typedef unsigned short uint16
typedef unsigned int uint32
typedef unsigned long long uint64
Enumerations
enum _AlgorithmStrategy { heuristic, force_sequential, force_parallel }
enum _FindAlgorithm { GROWING_BLOCKS, CONSTANT_SIZE_BLOCKS, EQUAL_SPLIT
}
enum _MultiwayMergeAlgorithm { LOSER_TREE }
enum _Parallelism { sequential, parallel_unbalanced, parallel_balanced,
parallel_omp_loop, parallel_omp_loop_static, parallel_taskqueue }
enum _PartialSumAlgorithm { RECURSIVE, LINEAR }
enum _SortAlgorithm { MWMS, QS, QS_BALANCED }
enum _SplittingAlgorithm { SAMPLING, EXACT }
Functions
template<typename Size > Size __log2 (Size n)
template<typename RandomAccessIterator , typename _DifferenceTp > void
calc_borders (RandomAccessIterator elements, _DifferenceTp length,
_DifferenceTp *off)
template<typename T > bool compare_and_swap (volatile T *ptr, T
comparand, T replacement)
bool compare_and_swap_32 (volatile int32 *ptr, int32 comparand, int32
replacement)
bool compare_and_swap_64 (volatile int64 *ptr, int64 comparand, int64
replacement)
template<typename InputIterator , typename OutputIterator >
OutputIterator copy_tail (std::pair< InputIterator, InputIterator >
b, std::pair< InputIterator, InputIterator > e, OutputIterator r)
void decode2 (lcas_t x, int &a, int &b)
template<typename RandomAccessIterator , typename _DifferenceTp > void
determine_samples (PMWMSSortingData< RandomAccessIterator > *sd,
_DifferenceTp num_samples)
lcas_t encode2 (int a, int b)
template<typename difference_type , typename OutputIterator >
OutputIterator equally_split (difference_type n, thread_index_t
num_threads, OutputIterator s)
template<typename difference_type > difference_type equally_split_point
(difference_type n, thread_index_t num_threads, thread_index_t
thread_no)
template<typename T > T fetch_and_add (volatile T *ptr, T addend)
int32 fetch_and_add_32 (volatile int32 *ptr, int32 addend)
int64 fetch_and_add_64 (volatile int64 *ptr, int64 addend)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename Pred , typename Selector >
std::pair< RandomAccessIterator1, RandomAccessIterator2 >
find_template (RandomAccessIterator1 begin1, RandomAccessIterator1
end1, RandomAccessIterator2 begin2, Pred pred, Selector selector,
constant_size_blocks_tag)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename Pred , typename Selector >
std::pair< RandomAccessIterator1, RandomAccessIterator2 >
find_template (RandomAccessIterator1 begin1, RandomAccessIterator1
end1, RandomAccessIterator2 begin2, Pred pred, Selector selector,
growing_blocks_tag)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename Pred , typename Selector >
std::pair< RandomAccessIterator1, RandomAccessIterator2 >
find_template (RandomAccessIterator1 begin1, RandomAccessIterator1
end1, RandomAccessIterator2 begin2, Pred pred, Selector selector,
equal_split_tag)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename Pred , typename Selector >
std::pair< RandomAccessIterator1, RandomAccessIterator2 >
find_template (RandomAccessIterator1 begin1, RandomAccessIterator1
end1, RandomAccessIterator2 begin2, Pred pred, Selector selector)
template<typename InputIterator , typename UserOp , typename
Functionality , typename Red , typename Result > UserOp
for_each_template_random_access (InputIterator begin, InputIterator
end, UserOp user_op, Functionality &functionality, Red reduction,
Result reduction_start, Result &output, typename
std::iterator_traits< InputIterator >::difference_type bound,
_Parallelism parallelism_tag)
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
for_each_template_random_access_ed (RandomAccessIterator begin,
RandomAccessIterator end, Op o, Fu &f, Red r, Result base, Result
&output, typename std::iterator_traits< RandomAccessIterator
>::difference_type bound)
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
for_each_template_random_access_omp_loop (RandomAccessIterator
begin, RandomAccessIterator end, Op o, Fu &f, Red r, Result base,
Result &output, typename std::iterator_traits< RandomAccessIterator
>::difference_type bound)
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
for_each_template_random_access_omp_loop_static
(RandomAccessIterator begin, RandomAccessIterator end, Op o, Fu &f,
Red r, Result base, Result &output, typename std::iterator_traits<
RandomAccessIterator >::difference_type bound)
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
for_each_template_random_access_workstealing (RandomAccessIterator
begin, RandomAccessIterator end, Op op, Fu &f, Red r, Result base,
Result &output, typename std::iterator_traits< RandomAccessIterator
>::difference_type bound)
int get_max_threads ()
bool is_parallel (const _Parallelism __p)
template<typename InputIterator , typename Comparator > bool is_sorted
(InputIterator begin, InputIterator end, Comparator comp=std::less<
typename std::iterator_traits< InputIterator >::value_type >())
template<typename InputIterator , typename Comparator > bool
is_sorted_failure (InputIterator begin, InputIterator end,
InputIterator &first_failure, Comparator comp=std::less< typename
std::iterator_traits< InputIterator >::value_type >())
template<typename InputIterator , typename Comparator > bool
is_sorted_print_failures (InputIterator begin, InputIterator end,
Comparator comp=std::less< typename std::iterator_traits<
InputIterator >::value_type >())
template<typename InputIterator , typename FunctorType > size_t
list_partition (const InputIterator begin, const InputIterator end,
InputIterator *starts, size_t *lengths, const int num_parts,
FunctorType &f, int oversampling=0)
template<typename T > const T & max (const T &a, const T &b)
template<typename RandomAccessIterator , typename Comparator >
RandomAccessIterator median_of_three_iterators
(RandomAccessIterator a, RandomAccessIterator b,
RandomAccessIterator c, Comparator &comp)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename OutputIterator , typename
_DifferenceTp , typename Comparator > OutputIterator merge_advance
(RandomAccessIterator1 &begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 &begin2, RandomAccessIterator2 end2,
OutputIterator target, _DifferenceTp max_length, Comparator comp)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename OutputIterator , typename
_DifferenceTp , typename Comparator > OutputIterator
merge_advance_movc (RandomAccessIterator1 &begin1,
RandomAccessIterator1 end1, RandomAccessIterator2 &begin2,
RandomAccessIterator2 end2, OutputIterator target, _DifferenceTp
max_length, Comparator comp)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename OutputIterator , typename
_DifferenceTp , typename Comparator > OutputIterator
merge_advance_usual (RandomAccessIterator1 &begin1,
RandomAccessIterator1 end1, RandomAccessIterator2 &begin2,
RandomAccessIterator2 end2, OutputIterator target, _DifferenceTp
max_length, Comparator comp)
template<typename T > const T & min (const T &a, const T &b)
template<typename RanSeqs , typename RankType , typename RankIterator ,
typename Comparator > void multiseq_partition (RanSeqs begin_seqs,
RanSeqs end_seqs, RankType rank, RankIterator begin_offsets,
Comparator comp=std::less< typename std::iterator_traits< typename
std::iterator_traits< RanSeqs >::value_type::first_type
>::value_type >())
template<typename T , typename RanSeqs , typename RankType , typename
Comparator > T multiseq_selection (RanSeqs begin_seqs, RanSeqs
end_seqs, RankType rank, RankType &offset, Comparator
comp=std::less< T >())
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, default_parallel_tag
tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, parallel_tag
tag=parallel_tag(0))
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::sampling_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::exact_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::sequential_tag)
template<template< typename RAI, typename C > class iterator, typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Comparator >
RandomAccessIterator3 multiway_merge_3_variant
(RandomAccessIteratorIterator seqs_begin,
RandomAccessIteratorIterator seqs_end, RandomAccessIterator3
target, _DifferenceTp length, Comparator comp)
template<template< typename RAI, typename C > class iterator, typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Comparator >
RandomAccessIterator3 multiway_merge_4_variant
(RandomAccessIteratorIterator seqs_begin,
RandomAccessIteratorIterator seqs_end, RandomAccessIterator3
target, _DifferenceTp length, Comparator comp)
template<bool stable, typename RandomAccessIteratorIterator , typename
Comparator , typename difference_type > void
multiway_merge_exact_splitting (RandomAccessIteratorIterator
seqs_begin, RandomAccessIteratorIterator seqs_end, difference_type
length, difference_type total_length, Comparator comp, std::vector<
std::pair< difference_type, difference_type > > *pieces)
template<typename LT , typename RandomAccessIteratorIterator , typename
RandomAccessIterator3 , typename _DifferenceTp , typename
Comparator > RandomAccessIterator3 multiway_merge_loser_tree
(RandomAccessIteratorIterator seqs_begin,
RandomAccessIteratorIterator seqs_end, RandomAccessIterator3
target, _DifferenceTp length, Comparator comp)
template<typename UnguardedLoserTree , typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Comparator >
RandomAccessIterator3 multiway_merge_loser_tree_sentinel
(RandomAccessIteratorIterator seqs_begin,
RandomAccessIteratorIterator seqs_end, RandomAccessIterator3
target, const typename std::iterator_traits< typename
std::iterator_traits< RandomAccessIteratorIterator
>::value_type::first_type >::value_type &sentinel, _DifferenceTp
length, Comparator comp)
template<typename LT , typename RandomAccessIteratorIterator , typename
RandomAccessIterator3 , typename _DifferenceTp , typename
Comparator > RandomAccessIterator3
multiway_merge_loser_tree_unguarded (RandomAccessIteratorIterator
seqs_begin, RandomAccessIteratorIterator seqs_end,
RandomAccessIterator3 target, const typename std::iterator_traits<
typename std::iterator_traits< RandomAccessIteratorIterator
>::value_type::first_type >::value_type &sentinel, _DifferenceTp
length, Comparator comp)
template<bool stable, typename RandomAccessIteratorIterator , typename
Comparator , typename difference_type > void
multiway_merge_sampling_splitting (RandomAccessIteratorIterator
seqs_begin, RandomAccessIteratorIterator seqs_end, difference_type
length, difference_type total_length, Comparator comp, std::vector<
std::pair< difference_type, difference_type > > *pieces)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge_sentinels
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, default_parallel_tag
tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge_sentinels
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, parallel_tag
tag=parallel_tag(0))
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge_sentinels
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, sampling_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge_sentinels
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::exact_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut multiway_merge_sentinels
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::sequential_tag)
template<typename RandomAccessIterator , typename Comparator > bool
operator< (unguarded_iterator< RandomAccessIterator, Comparator >
&bi1, unguarded_iterator< RandomAccessIterator, Comparator > &bi2)
template<typename RandomAccessIterator , typename Comparator > bool
operator< (guarded_iterator< RandomAccessIterator, Comparator >
&bi1, guarded_iterator< RandomAccessIterator, Comparator > &bi2)
template<typename RandomAccessIterator , typename Comparator > bool
operator<= (unguarded_iterator< RandomAccessIterator, Comparator >
&bi1, unguarded_iterator< RandomAccessIterator, Comparator > &bi2)
template<typename RandomAccessIterator , typename Comparator > bool
operator<= (guarded_iterator< RandomAccessIterator, Comparator >
&bi1, guarded_iterator< RandomAccessIterator, Comparator > &bi2)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator3 , typename Comparator > RandomAccessIterator3
parallel_merge_advance (RandomAccessIterator1 &begin1,
RandomAccessIterator1 end1, RandomAccessIterator1 &begin2,
RandomAccessIterator1 end2, RandomAccessIterator3 target, typename
std::iterator_traits< RandomAccessIterator1 >::difference_type
max_length, Comparator comp)
template<typename RandomAccessIterator1 , typename
RandomAccessIterator2 , typename RandomAccessIterator3 , typename
Comparator > RandomAccessIterator3 parallel_merge_advance
(RandomAccessIterator1 &begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 &begin2, RandomAccessIterator2 end2,
RandomAccessIterator3 target, typename std::iterator_traits<
RandomAccessIterator1 >::difference_type max_length, Comparator
comp)
template<bool stable, bool sentinels, typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Splitter , typename Comparator >
RandomAccessIterator3 parallel_multiway_merge
(RandomAccessIteratorIterator seqs_begin,
RandomAccessIteratorIterator seqs_end, RandomAccessIterator3
target, Splitter splitter, _DifferenceTp length, Comparator comp,
thread_index_t num_threads)
template<typename RandomAccessIterator , typename Comparator > void
parallel_nth_element (RandomAccessIterator begin,
RandomAccessIterator nth, RandomAccessIterator end, Comparator
comp)
template<typename RandomAccessIterator , typename Comparator > void
parallel_partial_sort (RandomAccessIterator begin,
RandomAccessIterator middle, RandomAccessIterator end, Comparator
comp)
template<typename InputIterator , typename OutputIterator , typename
BinaryOperation > OutputIterator parallel_partial_sum
(InputIterator begin, InputIterator end, OutputIterator result,
BinaryOperation bin_op)
template<typename InputIterator , typename OutputIterator , typename
BinaryOperation > OutputIterator parallel_partial_sum_basecase
(InputIterator begin, InputIterator end, OutputIterator result,
BinaryOperation bin_op, typename std::iterator_traits<
InputIterator >::value_type value)
template<typename InputIterator , typename OutputIterator , typename
BinaryOperation > OutputIterator parallel_partial_sum_linear
(InputIterator begin, InputIterator end, OutputIterator result,
BinaryOperation bin_op, typename std::iterator_traits<
InputIterator >::difference_type n)
template<typename RandomAccessIterator , typename Predicate >
std::iterator_traits< RandomAccessIterator >::difference_type
parallel_partition (RandomAccessIterator begin,
RandomAccessIterator end, Predicate pred, thread_index_t
num_threads)
template<typename RandomAccessIterator , typename RandomNumberGenerator
> void parallel_random_shuffle (RandomAccessIterator begin,
RandomAccessIterator end, RandomNumberGenerator
rng=random_number())
template<typename RandomAccessIterator , typename RandomNumberGenerator
> void parallel_random_shuffle_drs (RandomAccessIterator begin,
RandomAccessIterator end, typename std::iterator_traits<
RandomAccessIterator >::difference_type n, thread_index_t
num_threads, RandomNumberGenerator &rng)
template<typename RandomAccessIterator , typename RandomNumberGenerator
> void parallel_random_shuffle_drs_pu (DRSSorterPU<
RandomAccessIterator, RandomNumberGenerator > *pus)
template<typename InputIterator , typename OutputIterator , typename
Comparator > OutputIterator parallel_set_difference (InputIterator
begin1, InputIterator end1, InputIterator begin2, InputIterator
end2, OutputIterator result, Comparator comp)
template<typename InputIterator , typename OutputIterator , typename
Comparator > OutputIterator parallel_set_intersection
(InputIterator begin1, InputIterator end1, InputIterator begin2,
InputIterator end2, OutputIterator result, Comparator comp)
template<typename InputIterator , typename OutputIterator , typename
Operation > OutputIterator parallel_set_operation (InputIterator
begin1, InputIterator end1, InputIterator begin2, InputIterator
end2, OutputIterator result, Operation op)
template<typename InputIterator , typename OutputIterator , typename
Comparator > OutputIterator parallel_set_symmetric_difference
(InputIterator begin1, InputIterator end1, InputIterator begin2,
InputIterator end2, OutputIterator result, Comparator comp)
template<typename InputIterator , typename OutputIterator , typename
Comparator > OutputIterator parallel_set_union (InputIterator
begin1, InputIterator end1, InputIterator begin2, InputIterator
end2, OutputIterator result, Comparator comp)
template<bool stable, typename RandomAccessIterator , typename
Comparator > void parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, parallel_tag
parallelism)
template<bool stable, typename RandomAccessIterator , typename
Comparator > void parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, default_parallel_tag
parallelism)
template<bool stable, typename RandomAccessIterator , typename
Comparator > void parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, balanced_quicksort_tag
parallelism)
template<bool stable, typename RandomAccessIterator , typename
Comparator > void parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, quicksort_tag
parallelism)
template<bool stable, typename RandomAccessIterator , typename
Comparator > void parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp,
multiway_mergesort_sampling_tag parallelism)
template<bool stable, typename RandomAccessIterator , typename
Comparator > void parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp,
multiway_mergesort_exact_tag parallelism)
template<bool stable, typename RandomAccessIterator , typename
Comparator > void parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, multiway_mergesort_tag
parallelism)
template<bool stable, typename RandomAccessIterator , typename
Comparator , typename Parallelism > void parallel_sort
(RandomAccessIterator begin, RandomAccessIterator end, Comparator
comp, Parallelism parallelism)
template<bool stable, bool exact, typename RandomAccessIterator ,
typename Comparator > void parallel_sort_mwms (RandomAccessIterator
begin, RandomAccessIterator end, Comparator comp, thread_index_t
num_threads)
template<bool stable, bool exact, typename RandomAccessIterator ,
typename Comparator > void parallel_sort_mwms_pu (PMWMSSortingData<
RandomAccessIterator > *sd, Comparator &comp)
template<typename RandomAccessIterator , typename Comparator > void
parallel_sort_qs (RandomAccessIterator begin, RandomAccessIterator
end, Comparator comp, thread_index_t num_threads)
template<typename RandomAccessIterator , typename Comparator > void
parallel_sort_qs_conquer (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, thread_index_t
num_threads)
template<typename RandomAccessIterator , typename Comparator >
std::iterator_traits< RandomAccessIterator >::difference_type
parallel_sort_qs_divide (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, typename
std::iterator_traits< RandomAccessIterator >::difference_type
pivot_rank, typename std::iterator_traits< RandomAccessIterator
>::difference_type num_samples, thread_index_t num_threads)
template<typename RandomAccessIterator , typename Comparator > void
parallel_sort_qsb (RandomAccessIterator begin, RandomAccessIterator
end, Comparator comp, thread_index_t num_threads)
template<typename InputIterator , class OutputIterator > OutputIterator
parallel_unique_copy (InputIterator first, InputIterator last,
OutputIterator result)
template<typename InputIterator , class OutputIterator , class
BinaryPredicate > OutputIterator parallel_unique_copy
(InputIterator first, InputIterator last, OutputIterator result,
BinaryPredicate binary_pred)
template<typename RandomAccessIterator , typename Comparator > void
qsb_conquer (QSBThreadLocal< RandomAccessIterator > **tls,
RandomAccessIterator begin, RandomAccessIterator end, Comparator
comp, thread_index_t iam, thread_index_t num_threads, bool
parent_wait)
template<typename RandomAccessIterator , typename Comparator >
std::iterator_traits< RandomAccessIterator >::difference_type
qsb_divide (RandomAccessIterator begin, RandomAccessIterator end,
Comparator comp, thread_index_t num_threads)
template<typename RandomAccessIterator , typename Comparator > void
qsb_local_sort_with_helping (QSBThreadLocal< RandomAccessIterator >
**tls, Comparator &comp, int iam, bool wait)
template<typename RandomNumberGenerator > int random_number_pow2 (int
logp, RandomNumberGenerator &rng)
template<typename T > T round_up_to_pow2 (T x)
template<typename _RandomAccessIterator1 , typename
_RandomAccessIterator2 , typename Pred > _RandomAccessIterator1
search_template (_RandomAccessIterator1 begin1,
_RandomAccessIterator1 end1, _RandomAccessIterator2 begin2,
_RandomAccessIterator2 end2, Pred pred)
template<bool stable, bool sentinels, typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Comparator >
RandomAccessIterator3 sequential_multiway_merge
(RandomAccessIteratorIterator seqs_begin,
RandomAccessIteratorIterator seqs_end, RandomAccessIterator3
target, const typename std::iterator_traits< typename
std::iterator_traits< RandomAccessIteratorIterator
>::value_type::first_type >::value_type &sentinel, _DifferenceTp
length, Comparator comp)
template<typename RandomAccessIterator , typename RandomNumberGenerator
> void sequential_random_shuffle (RandomAccessIterator begin,
RandomAccessIterator end, RandomNumberGenerator &rng)
template<typename InputIterator > void shrink (std::vector<
InputIterator > &os_starts, size_t &count_to_two, size_t
&range_length)
template<typename InputIterator > void shrink_and_double (std::vector<
InputIterator > &os_starts, size_t &count_to_two, size_t
&range_length, const bool make_twice)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut stable_multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, default_parallel_tag
tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut stable_multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, parallel_tag
tag=parallel_tag(0))
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut stable_multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp, sampling_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut stable_multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::exact_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut stable_multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::sequential_tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut
stable_multiway_merge_sentinels (RandomAccessIteratorPairIterator
seqs_begin, RandomAccessIteratorPairIterator seqs_end,
RandomAccessIteratorOut target, _DifferenceTp length, Comparator
comp, default_parallel_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut
stable_multiway_merge_sentinels (RandomAccessIteratorPairIterator
seqs_begin, RandomAccessIteratorPairIterator seqs_end,
RandomAccessIteratorOut target, _DifferenceTp length, Comparator
comp, parallel_tag tag=parallel_tag(0))
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut
stable_multiway_merge_sentinels (RandomAccessIteratorPairIterator
seqs_begin, RandomAccessIteratorPairIterator seqs_end,
RandomAccessIteratorOut target, _DifferenceTp length, Comparator
comp, sampling_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut
stable_multiway_merge_sentinels (RandomAccessIteratorPairIterator
seqs_begin, RandomAccessIteratorPairIterator seqs_end,
RandomAccessIteratorOut target, _DifferenceTp length, Comparator
comp, __gnu_parallel::exact_tag tag)
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename
Comparator > RandomAccessIteratorOut
stable_multiway_merge_sentinels (RandomAccessIteratorPairIterator
seqs_begin, RandomAccessIteratorPairIterator seqs_end,
RandomAccessIteratorOut target, _DifferenceTp length, Comparator
comp, __gnu_parallel::sequential_tag)
void yield ()
Variables
static const int lcas_t_bits
static const lcas_t lcas_t_mask
Detailed Description
GNU parallel code for public use.
Typedef Documentation
typedef unsigned short __gnu_parallel::bin_index
Type to hold the index of a bin. Since many variables of this type are
allocated, it should be chosen as small as possible.
Definition at line 47 of file random_shuffle.h.
typedef short __gnu_parallel::int16
Integer Types. 16-bit signed integer.
Definition at line 114 of file types.h.
typedef int __gnu_parallel::int32
32-bit signed integer.
Definition at line 120 of file types.h.
typedef long long __gnu_parallel::int64
64-bit signed integer.
Definition at line 126 of file types.h.
typedef int64 __gnu_parallel::lcas_t
Longest compare-and-swappable integer type on this platform.
Definition at line 145 of file types.h.
typedef uint64 __gnu_parallel::sequence_index_t
Unsigned integer to index elements. The total number of elements for
each algorithm must fit into this type.
Definition at line 135 of file types.h.
typedef uint16 __gnu_parallel::thread_index_t
Unsigned integer to index a thread number. The maximum thread number
(for each processor) must fit into this type.
Definition at line 141 of file types.h.
typedef unsigned short __gnu_parallel::uint16
16-bit unsigned integer.
Definition at line 117 of file types.h.
typedef unsigned int __gnu_parallel::uint32
32-bit unsigned integer.
Definition at line 123 of file types.h.
typedef unsigned long long __gnu_parallel::uint64
64-bit unsigned integer.
Definition at line 129 of file types.h.
Enumeration Type Documentation
enum __gnu_parallel::_AlgorithmStrategy
Strategies for run-time algorithm selection:.
Definition at line 65 of file types.h.
enum __gnu_parallel::_FindAlgorithm
Find algorithms:.
Definition at line 104 of file types.h.
enum __gnu_parallel::_MultiwayMergeAlgorithm
Merging algorithms:.
Definition at line 83 of file types.h.
enum __gnu_parallel::_Parallelism
Run-time equivalents for the compile-time tags.
Enumerator:
sequential
Not parallel.
parallel_unbalanced
Parallel unbalanced (equal-sized chunks).
parallel_balanced
Parallel balanced (work-stealing).
parallel_omp_loop
Parallel with OpenMP dynamic load-balancing.
parallel_omp_loop_static
Parallel with OpenMP static load-balancing.
parallel_taskqueue
Parallel with OpenMP taskqueue construct.
Definition at line 42 of file types.h.
enum __gnu_parallel::_PartialSumAlgorithm
Partial sum algorithms: recursive, linear.
Definition at line 89 of file types.h.
enum __gnu_parallel::_SortAlgorithm
Sorting algorithms:.
Definition at line 74 of file types.h.
enum __gnu_parallel::_SplittingAlgorithm
Sorting/merging algorithms: sampling, exact.
Definition at line 96 of file types.h.
Function Documentation
template<typename Size > Size __gnu_parallel::__log2 (Size n) [inline]
Calculates the rounded-down logarithm of n for base 2. Parameters:
n Argument.
Returns:
Returns 0 for any argument <1.
Definition at line 105 of file base.h.
Referenced by __gnu_parallel::LoserTreeBase< T, Comparator
>::LoserTreeBase(), multiseq_partition(), multiseq_selection(),
parallel_random_shuffle_drs(), round_up_to_pow2(), and
sequential_random_shuffle().
template<typename RandomAccessIterator , typename _DifferenceTp > void
__gnu_parallel::calc_borders (RandomAccessIterator elements,
_DifferenceTp length, _DifferenceTp * off) [inline]
Precalculate advances for Knuth-Morris-Pratt algorithm. Parameters:
elements Begin iterator of sequence to search for.
length Length of sequence to search for.
advances Returned offsets.
Definition at line 52 of file search.h.
Referenced by search_template().
template<typename T > bool __gnu_parallel::compare_and_swap (volatile T *
ptr, T comparand, T replacement) [inline]
Compare *ptr and comparand. If equal, let *ptr=replacement and return
true, return false otherwise. Implementation is heavily platform-
dependent.
Parameters:
ptr Pointer to signed integer.
comparand Compare value.
replacement Replacement value.
Definition at line 327 of file parallel/compatibility.h.
References compare_and_swap_32(), and compare_and_swap_64().
Referenced by __gnu_parallel::RestrictedBoundedConcurrentQueue< Piece
>::pop_back(), and __gnu_parallel::RestrictedBoundedConcurrentQueue<
Piece >::pop_front().
bool __gnu_parallel::compare_and_swap_32 (volatile int32 * ptr, int32
comparand, int32 replacement) [inline]
Compare *ptr and comparand. If equal, let *ptr=replacement and return
true, return false otherwise. Implementation is heavily platform-
dependent.
Parameters:
ptr Pointer to 32-bit signed integer.
comparand Compare value.
replacement Replacement value.
Definition at line 235 of file parallel/compatibility.h.
Referenced by compare_and_swap().
bool __gnu_parallel::compare_and_swap_64 (volatile int64 * ptr, int64
comparand, int64 replacement) [inline]
Compare *ptr and comparand. If equal, let *ptr=replacement and return
true, return false otherwise. Implementation is heavily platform-
dependent.
Parameters:
ptr Pointer to 64-bit signed integer.
comparand Compare value.
replacement Replacement value.
Definition at line 275 of file parallel/compatibility.h.
Referenced by compare_and_swap().
void __gnu_parallel::decode2 (lcas_t x, int & a, int & b) [inline]
Decode two integers from one __gnu_parallel::lcas_t. Parameters:
x __gnu_parallel::lcas_t to decode integers from.
a First integer, to be decoded from the most-significant
lcas_t_bits/2 bits of x.
b Second integer, to be encoded in the least-significant
lcas_t_bits/2 bits of x.
See also:
encode2
Definition at line 136 of file base.h.
References lcas_t_bits, and lcas_t_mask.
Referenced by __gnu_parallel::RestrictedBoundedConcurrentQueue< Piece
>::pop_back(), __gnu_parallel::RestrictedBoundedConcurrentQueue< Piece
>::pop_front(), and __gnu_parallel::RestrictedBoundedConcurrentQueue<
Piece >::push_front().
template<typename RandomAccessIterator , typename _DifferenceTp > void
__gnu_parallel::determine_samples (PMWMSSortingData<
RandomAccessIterator > * sd, _DifferenceTp num_samples) [inline]
Select samples from a sequence. Parameters:
sd Pointer to algorithm data. Result will be placed in sd->samples.
num_samples Number of samples to select.
Definition at line 98 of file multiway_mergesort.h.
References equally_split(), __gnu_parallel::PMWMSSortingData<
RandomAccessIterator >::samples, __gnu_parallel::PMWMSSortingData<
RandomAccessIterator >::source, and __gnu_parallel::PMWMSSortingData<
RandomAccessIterator >::starts.
lcas_t __gnu_parallel::encode2 (int a, int b) [inline]
Encode two integers into one __gnu_parallel::lcas_t. Parameters:
a First integer, to be encoded in the most-significant
lcas_t_bits/2 bits.
b Second integer, to be encoded in the least-significant
lcas_t_bits/2 bits.
Returns:
__gnu_parallel::lcas_t value encoding a and b.
See also:
decode2
Definition at line 122 of file base.h.
References lcas_t_bits.
Referenced by __gnu_parallel::RestrictedBoundedConcurrentQueue< Piece
>::pop_back(), __gnu_parallel::RestrictedBoundedConcurrentQueue< Piece
>::pop_front(), __gnu_parallel::RestrictedBoundedConcurrentQueue< Piece
>::push_front(), and __gnu_parallel::RestrictedBoundedConcurrentQueue<
Piece >::RestrictedBoundedConcurrentQueue().
template<typename difference_type , typename OutputIterator >
OutputIterator __gnu_parallel::equally_split (difference_type n,
thread_index_t num_threads, OutputIterator s) [inline]
Function to split a sequence into parts of almost equal size. The
resulting sequence s of length num_threads+1 contains the splitting
positions when splitting the range [0,n) into parts of almost equal
size (plus minus 1). The first entry is 0, the last one n. There may
result empty parts.
Parameters:
n Number of elements
num_threads Number of parts
s Splitters
Returns:
End of splitter sequence, i. e. s+num_threads+1
Definition at line 48 of file equally_split.h.
Referenced by determine_samples(), find_template(),
multiway_merge_exact_splitting(), parallel_partial_sum_linear(),
parallel_unique_copy(), and search_template().
template<typename difference_type > difference_type
__gnu_parallel::equally_split_point (difference_type n, thread_index_t
num_threads, thread_index_t thread_no) [inline]
Function to split a sequence into parts of almost equal size. Returns
the position of the splitting point between thread number thread_no
(included) and thread number thread_no+1 (excluded).
Parameters:
n Number of elements
num_threads Number of parts
Returns:
_SplittingAlgorithm point
Definition at line 73 of file equally_split.h.
Referenced by for_each_template_random_access_ed().
template<typename T > T __gnu_parallel::fetch_and_add (volatile T * ptr, T
addend) [inline]
Add a value to a variable, atomically. Implementation is heavily
platform-dependent.
Parameters:
ptr Pointer to a signed integer.
addend Value to add.
Definition at line 185 of file parallel/compatibility.h.
References fetch_and_add_32(), and fetch_and_add_64().
Referenced by __gnu_parallel::RestrictedBoundedConcurrentQueue< Piece
>::push_front().
int32 __gnu_parallel::fetch_and_add_32 (volatile int32 * ptr, int32 addend)
[inline]
Add a value to a variable, atomically. Implementation is heavily
platform-dependent.
Parameters:
ptr Pointer to a 32-bit signed integer.
addend Value to add.
Definition at line 95 of file parallel/compatibility.h.
Referenced by fetch_and_add().
int64 __gnu_parallel::fetch_and_add_64 (volatile int64 * ptr, int64 addend)
[inline]
Add a value to a variable, atomically. Implementation is heavily
platform-dependent.
Parameters:
ptr Pointer to a 64-bit signed integer.
addend Value to add.
Definition at line 134 of file parallel/compatibility.h.
Referenced by fetch_and_add().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename Pred , typename Selector > std::pair<RandomAccessIterator1,
RandomAccessIterator2> __gnu_parallel::find_template
(RandomAccessIterator1 begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 begin2, Pred pred, Selector selector,
constant_size_blocks_tag) [inline]
Parallel std::find, constant block size variant. Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence. Second sequence must have
same length as first sequence.
pred Find predicate.
selector Functionality (e. g. std::find_if (), std::equal(),...)
Returns:
Place of finding in both sequences.
See also:
__gnu_parallel::_Settings::find_sequential_search_size
__gnu_parallel::_Settings::find_block_size There are two main
differences between the growing blocks and the constant-size blocks
variants. 1. For GB, the block size grows; for CSB, the block size
is fixed. 2. For GB, the blocks are allocated dynamically; for CSB,
the blocks are allocated in a predetermined manner, namely spacial
round-robin.
Definition at line 314 of file find.h.
References _GLIBCXX_CALL,
__gnu_parallel::_Settings::find_initial_block_size,
__gnu_parallel::_Settings::find_sequential_search_size, and
__gnu_parallel::_Settings::get().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename Pred , typename Selector > std::pair<RandomAccessIterator1,
RandomAccessIterator2> __gnu_parallel::find_template
(RandomAccessIterator1 begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 begin2, Pred pred, Selector selector,
growing_blocks_tag) [inline]
Parallel std::find, growing block size variant. Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence. Second sequence must have
same length as first sequence.
pred Find predicate.
selector Functionality (e. g. std::find_if (), std::equal(),...)
Returns:
Place of finding in both sequences.
See also:
__gnu_parallel::_Settings::find_sequential_search_size
__gnu_parallel::_Settings::find_initial_block_size
__gnu_parallel::_Settings::find_maximum_block_size
__gnu_parallel::_Settings::find_increasing_factor
There are two main differences between the growing blocks and the
constant-size blocks variants. 1. For GB, the block size grows; for
CSB, the block size is fixed.
2. For GB, the blocks are allocated dynamically; for CSB, the blocks
are allocated in a predetermined manner, namely spacial round-robin.
Definition at line 191 of file find.h.
References _GLIBCXX_CALL,
__gnu_parallel::_Settings::find_increasing_factor,
__gnu_parallel::_Settings::find_initial_block_size,
__gnu_parallel::_Settings::find_maximum_block_size,
__gnu_parallel::_Settings::find_sequential_search_size, and
__gnu_parallel::_Settings::get().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename Pred , typename Selector > std::pair<RandomAccessIterator1,
RandomAccessIterator2> __gnu_parallel::find_template
(RandomAccessIterator1 begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 begin2, Pred pred, Selector selector,
equal_split_tag) [inline]
Parallel std::find, equal splitting variant. Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence. Second sequence must have
same length as first sequence.
pred Find predicate.
selector Functionality (e. g. std::find_if (), std::equal(),...)
Returns:
Place of finding in both sequences.
Definition at line 97 of file find.h.
References _GLIBCXX_CALL, and equally_split().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename Pred , typename Selector > std::pair<RandomAccessIterator1,
RandomAccessIterator2> __gnu_parallel::find_template
(RandomAccessIterator1 begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 begin2, Pred pred, Selector selector) [inline]
Parallel std::find, switch for different algorithms. Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence. Must have same length as
first sequence.
pred Find predicate.
selector Functionality (e. g. std::find_if (), std::equal(),...)
Returns:
Place of finding in both sequences.
Definition at line 60 of file find.h.
References __gnu_parallel::_Settings::get().
template<typename InputIterator , typename UserOp , typename Functionality
, typename Red , typename Result > UserOp
__gnu_parallel::for_each_template_random_access (InputIterator begin,
InputIterator end, UserOp user_op, Functionality & functionality, Red
reduction, Result reduction_start, Result & output, typename
std::iterator_traits< InputIterator >::difference_type bound,
_Parallelism parallelism_tag) [inline]
Chose the desired algorithm by evaluating parallelism_tag. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
user_op A user-specified functor (comparator, predicate,
associative operator,...)
functionality functor to 'process' an element with user_op (depends
on desired functionality, e. g. accumulate, for_each,...
reduction Reduction functor.
reduction_start Initial value for reduction.
output Output iterator.
bound Maximum number of elements processed.
parallelism_tag Parallelization method
Definition at line 61 of file for_each.h.
References for_each_template_random_access_ed(),
for_each_template_random_access_omp_loop(),
for_each_template_random_access_workstealing(), parallel_omp_loop,
parallel_omp_loop_static, and parallel_unbalanced.
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
__gnu_parallel::for_each_template_random_access_ed
(RandomAccessIterator begin, RandomAccessIterator end, Op o, Fu & f,
Red r, Result base, Result & output, typename std::iterator_traits<
RandomAccessIterator >::difference_type bound) [inline]
Embarrassingly parallel algorithm for random access iterators, using
hand-crafted parallelization by equal splitting the work. Parameters:
begin Begin iterator of element sequence.
end End iterator of element sequence.
o User-supplied functor (comparator, predicate, adding functor,
...)
f Functor to 'process' an element with op (depends on desired
functionality, e. g. for std::for_each(), ...).
r Functor to 'add' a single result to the already processed
elements (depends on functionality).
base Base value for reduction.
output Pointer to position where final result is written to
bound Maximum number of elements processed (e. g. for
std::count_n()).
Returns:
User-supplied functor (that may contain a part of the result).
Definition at line 68 of file par_loop.h.
References equally_split_point().
Referenced by for_each_template_random_access().
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
__gnu_parallel::for_each_template_random_access_omp_loop
(RandomAccessIterator begin, RandomAccessIterator end, Op o, Fu & f,
Red r, Result base, Result & output, typename std::iterator_traits<
RandomAccessIterator >::difference_type bound) [inline]
Embarrassingly parallel algorithm for random access iterators, using an
OpenMP for loop. Parameters:
begin Begin iterator of element sequence.
end End iterator of element sequence.
o User-supplied functor (comparator, predicate, adding functor,
etc.).
f Functor to 'process' an element with op (depends on desired
functionality, e. g. for std::for_each(), ...).
r Functor to 'add' a single result to the already processed
elements (depends on functionality).
base Base value for reduction.
output Pointer to position where final result is written to
bound Maximum number of elements processed (e. g. for
std::count_n()).
Returns:
User-supplied functor (that may contain a part of the result).
Definition at line 67 of file omp_loop.h.
Referenced by for_each_template_random_access().
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
__gnu_parallel::for_each_template_random_access_omp_loop_static
(RandomAccessIterator begin, RandomAccessIterator end, Op o, Fu & f,
Red r, Result base, Result & output, typename std::iterator_traits<
RandomAccessIterator >::difference_type bound) [inline]
Embarrassingly parallel algorithm for random access iterators, using an
OpenMP for loop with static scheduling. Parameters:
begin Begin iterator of element sequence.
end End iterator of element sequence.
o User-supplied functor (comparator, predicate, adding functor,
...).
f Functor to 'process' an element with op (depends on desired
functionality, e. g. for std::for_each(), ...).
r Functor to 'add' a single result to the already processed
elements (depends on functionality).
base Base value for reduction.
output Pointer to position where final result is written to
bound Maximum number of elements processed (e. g. for
std::count_n()).
Returns:
User-supplied functor (that may contain a part of the result).
Definition at line 67 of file omp_loop_static.h.
template<typename RandomAccessIterator , typename Op , typename Fu ,
typename Red , typename Result > Op
__gnu_parallel::for_each_template_random_access_workstealing
(RandomAccessIterator begin, RandomAccessIterator end, Op op, Fu & f,
Red r, Result base, Result & output, typename std::iterator_traits<
RandomAccessIterator >::difference_type bound) [inline]
Work stealing algorithm for random access iterators. Uses O(1)
additional memory. Synchronization at job lists is done with atomic
operations.
Parameters:
begin Begin iterator of element sequence.
end End iterator of element sequence.
op User-supplied functor (comparator, predicate, adding functor,
...).
f Functor to 'process' an element with op (depends on desired
functionality, e. g. for std::for_each(), ...).
r Functor to 'add' a single result to the already processed
elements (depends on functionality).
base Base value for reduction.
output Pointer to position where final result is written to
bound Maximum number of elements processed (e. g. for
std::count_n()).
Returns:
User-supplied functor (that may contain a part of the result).
Definition at line 99 of file workstealing.h.
References _GLIBCXX_CALL, __gnu_parallel::_Settings::cache_line_size,
__gnu_parallel::Job< _DifferenceTp >::first,
__gnu_parallel::_Settings::get(), __gnu_parallel::Job< _DifferenceTp
>::last, __gnu_parallel::Job< _DifferenceTp >::load, min(), and
yield().
Referenced by for_each_template_random_access().
template<typename InputIterator , typename Comparator > bool
__gnu_parallel::is_sorted (InputIterator begin, InputIterator end,
Comparator comp = std::less<typename
std::iterator_traits<InputIterator>:: value_type>()) [inline]
Check whether [begin, end) is sorted according to comp. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
comp Comparator.
Returns:
true if sorted, false otherwise.
Definition at line 51 of file checkers.h.
Referenced by multiway_merge_loser_tree_sentinel(),
parallel_multiway_merge(), and sequential_multiway_merge().
template<typename InputIterator , typename Comparator > bool
__gnu_parallel::is_sorted_failure (InputIterator begin, InputIterator
end, InputIterator & first_failure, Comparator comp =
std::less<typename std::iterator_traits<InputIterator>:: value_type>())
[inline]
Check whether [begin, end) is sorted according to comp. Prints the
position in case an unordered pair is found. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
first_failure The first failure is returned in this variable.
comp Comparator.
Returns:
true if sorted, false otherwise.
Definition at line 89 of file checkers.h.
template<typename InputIterator , typename Comparator > bool
__gnu_parallel::is_sorted_print_failures (InputIterator begin,
InputIterator end, Comparator comp = std::less<typename
std::iterator_traits <InputIterator>::value_type>()) [inline]
Check whether [begin, end) is sorted according to comp. Prints all
unordered pair, including the surrounding two elements. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
comp Comparator.
Returns:
true if sorted, false otherwise.
Definition at line 129 of file checkers.h.
template<typename InputIterator , typename FunctorType > size_t
__gnu_parallel::list_partition (const InputIterator begin, const
InputIterator end, InputIterator * starts, size_t * lengths, const int
num_parts, FunctorType & f, int oversampling = 0) [inline]
Splits a sequence given by input iterators into parts of almost equal
size. The function needs only one pass over the sequence.
Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
starts Start iterators for the resulting parts, dimension
num_parts+1. For convenience, starts [num_parts] contains the end
iterator of the sequence.
lengths Length of the resulting parts.
num_parts Number of parts to split the sequence into.
f Functor to be applied to each element by traversing it
oversampling Oversampling factor. If 0, then the partitions will
differ in at most $ t{thrm{end} - thrm{begin}} $ elements.
Otherwise, the ratio between the longest and the shortest part is
bounded by $ 1/(thrm{oversampling}
Returns:
Length of the whole sequence.
Definition at line 100 of file list_partition.h.
References shrink_and_double(), and std::vector< _Tp, _Alloc >::size().
template<typename T > const T& __gnu_parallel::max (const T & a, const T &
b) [inline]
Equivalent to std::max.
Definition at line 151 of file base.h.
Referenced by multiseq_partition(), multiseq_selection(), and
parallel_nth_element().
template<typename RandomAccessIterator , typename Comparator >
RandomAccessIterator __gnu_parallel::median_of_three_iterators
(RandomAccessIterator a, RandomAccessIterator b, RandomAccessIterator
c, Comparator & comp) [inline]
Compute the median of three referenced elements, according to comp.
Parameters:
a First iterator.
b Second iterator.
c Third iterator.
comp Comparator.
Definition at line 443 of file base.h.
Referenced by qsb_divide().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename OutputIterator , typename _DifferenceTp , typename Comparator
> OutputIterator __gnu_parallel::merge_advance (RandomAccessIterator1 &
begin1, RandomAccessIterator1 end1, RandomAccessIterator2 & begin2,
RandomAccessIterator2 end2, OutputIterator target, _DifferenceTp
max_length, Comparator comp) [inline]
Merge routine being able to merge only the max_length smallest
elements. The begin iterators are advanced accordingly, they might not
reach end, in contrast to the usual variant. Static switch on whether
to use the conditional-move variant.
Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence.
end2 End iterator of second sequence.
target Target begin iterator.
max_length Maximum number of elements to merge.
comp Comparator.
Returns:
Output end iterator.
Definition at line 174 of file merge.h.
References _GLIBCXX_CALL, and merge_advance_movc().
Referenced by parallel_merge_advance(), and
sequential_multiway_merge().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename OutputIterator , typename _DifferenceTp , typename Comparator
> OutputIterator __gnu_parallel::merge_advance_movc
(RandomAccessIterator1 & begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 & begin2, RandomAccessIterator2 end2,
OutputIterator target, _DifferenceTp max_length, Comparator comp)
[inline]
Merge routine being able to merge only the max_length smallest
elements. The begin iterators are advanced accordingly, they might not
reach end, in contrast to the usual variant. Specially designed code
should allow the compiler to generate conditional moves instead of
branches.
Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence.
end2 End iterator of second sequence.
target Target begin iterator.
max_length Maximum number of elements to merge.
comp Comparator.
Returns:
Output end iterator.
Definition at line 106 of file merge.h.
Referenced by merge_advance().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename OutputIterator , typename _DifferenceTp , typename Comparator
> OutputIterator __gnu_parallel::merge_advance_usual
(RandomAccessIterator1 & begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 & begin2, RandomAccessIterator2 end2,
OutputIterator target, _DifferenceTp max_length, Comparator comp)
[inline]
Merge routine being able to merge only the max_length smallest
elements. The begin iterators are advanced accordingly, they might not
reach end, in contrast to the usual variant.
Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence.
end2 End iterator of second sequence.
target Target begin iterator.
max_length Maximum number of elements to merge.
comp Comparator.
Returns:
Output end iterator.
Definition at line 57 of file merge.h.
template<typename T > const T& __gnu_parallel::min (const T & a, const T &
b) [inline]
Equivalent to std::min.
Definition at line 145 of file base.h.
Referenced by for_each_template_random_access_workstealing(),
multiseq_partition(), multiseq_selection(), parallel_sort_qs_divide(),
and search_template().
template<typename RanSeqs , typename RankType , typename RankIterator ,
typename Comparator > void __gnu_parallel::multiseq_partition (RanSeqs
begin_seqs, RanSeqs end_seqs, RankType rank, RankIterator
begin_offsets, Comparator comp = std::less< typename
std::iterator_traits<typename
std::iterator_traits<RanSeqs>::value_type:: first_type>::value_type>())
[inline]
Splits several sorted sequences at a certain global rank, resulting in
a splitting point for each sequence. The sequences are passed via a
sequence of random-access iterator pairs, none of the sequences may be
empty. If there are several equal elements across the split, the ones
on the left side will be chosen from sequences with smaller number.
Parameters:
begin_seqs Begin of the sequence of iterator pairs.
end_seqs End of the sequence of iterator pairs.
rank The global rank to partition at.
begin_offsets A random-access sequence begin where the result will
be stored in. Each element of the sequence is an iterator that
points to the first element on the greater part of the respective
sequence.
comp The ordering functor, defaults to std::less<T>.
Definition at line 123 of file multiseq_selection.h.
References __log2(), _GLIBCXX_CALL, std::vector< _Tp, _Alloc
>::begin(), std::distance(), __gnu_cxx::distance(),
std::priority_queue< _Tp, _Sequence, _Compare >::empty(), std::vector<
_Tp, _Alloc >::end(), max(), min(), std::priority_queue< _Tp,
_Sequence, _Compare >::pop(), std::priority_queue< _Tp, _Sequence,
_Compare >::push(), std::vector< _Tp, _Alloc >::push_back(), and
std::priority_queue< _Tp, _Sequence, _Compare >::top().
Referenced by multiway_merge_exact_splitting().
template<typename T , typename RanSeqs , typename RankType , typename
Comparator > T __gnu_parallel::multiseq_selection (RanSeqs begin_seqs,
RanSeqs end_seqs, RankType rank, RankType & offset, Comparator comp =
std::less<T>()) [inline]
Selects the element at a certain global rank from several sorted
sequences. The sequences are passed via a sequence of random-access
iterator pairs, none of the sequences may be empty.
Parameters:
begin_seqs Begin of the sequence of iterator pairs.
end_seqs End of the sequence of iterator pairs.
rank The global rank to partition at.
offset The rank of the selected element in the global subsequence
of elements equal to the selected element. If the selected element
is unique, this number is 0.
comp The ordering functor, defaults to std::less.
Definition at line 377 of file multiseq_selection.h.
References __log2(), _GLIBCXX_CALL, std::vector< _Tp, _Alloc
>::begin(), std::distance(), __gnu_cxx::distance(),
std::priority_queue< _Tp, _Sequence, _Compare >::empty(), std::vector<
_Tp, _Alloc >::end(), max(), min(), std::priority_queue< _Tp,
_Sequence, _Compare >::pop(), std::priority_queue< _Tp, _Sequence,
_Compare >::push(), std::vector< _Tp, _Alloc >::push_back(), and
std::priority_queue< _Tp, _Sequence, _Compare >::top().
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename Comparator
> RandomAccessIteratorOut __gnu_parallel::multiway_merge
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::sequential_tag) [inline]
Multiway Merge Frontend. Merge the sequences specified by seqs_begin
and seqs_end into target. seqs_begin and seqs_end must point to a
sequence of pairs. These pairs must contain an iterator to the
beginning of a sequence in their first entry and an iterator the end of
the same sequence in their second entry.
Ties are broken arbitrarily. See stable_multiway_merge for a variant
that breaks ties by sequence number but is slower.
The first entries of the pairs (i.e. the begin iterators) will be moved
forward.
The output sequence has to provide enough space for all elements that
are written to it.
This function will merge the input sequences:
· not stable
· parallel, depending on the input size and Settings
· using sampling for splitting
· not using sentinels
Example:
int sequences[10][10];
for (int i = 0; i < 10; ++i)
for (int j = 0; i < 10; ++j)
sequences[i][j] = j;
int out[33];
std::vector<std::pair<int*> > seqs;
for (int i = 0; i < 10; ++i)
{ seqs.push(std::make_pair<int*>(sequences[i], sequences[i] + 10)) }
multiway_merge(seqs.begin(), seqs.end(), target, std::less<int>(), 33);
See also:
stable_multiway_merge
Precondition:
All input sequences must be sorted.
Target must provide enough space to merge out length elements or
the number of elements in all sequences, whichever is smaller.
Postcondition:
[target, return value) contains merged elements from the input
sequences.
return value - target = min(length, number of elements in all
sequences).
Parameters:
RandomAccessIteratorPairIterator iterator over sequence of pairs of
iterators
RandomAccessIteratorOut iterator over target sequence
_DifferenceTp difference type for the sequence
Comparator strict weak ordering type to compare elements in
sequences
seqs_begin begin of sequence sequence
seqs_end end of sequence sequence
target target sequence to merge to.
comp strict weak ordering to use for element comparison.
length Maximum length to merge, possibly larger than the number of
elements available.
Returns:
end iterator of output sequence
Definition at line 1477 of file multiway_merge.h.
References _GLIBCXX_CALL, and sequential_multiway_merge().
template<template< typename RAI, typename C > class iterator, typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Comparator > RandomAccessIterator3
__gnu_parallel::multiway_merge_3_variant (RandomAccessIteratorIterator
seqs_begin, RandomAccessIteratorIterator seqs_end,
RandomAccessIterator3 target, _DifferenceTp length, Comparator comp)
[inline]
Highly efficient 3-way merging procedure. Merging is done with the
algorithm implementation described by Peter Sanders. Basically, the
idea is to minimize the number of necessary comparison after merging
out an element. The implementation trick that makes this fast is that
the order of the sequences is stored in the instruction pointer
(translated into labels in C++).
This works well for merging up to 4 sequences.
Note that making the merging stable does not come at a performance hit.
Whether the merging is done guarded or unguarded is selected by the
used iterator class.
Parameters:
seqs_begin Begin iterator of iterator pair input sequence.
seqs_end End iterator of iterator pair input sequence.
target Begin iterator out output sequence.
comp Comparator.
length Maximum length to merge, less equal than the total number of
elements available.
Returns:
End iterator of output sequence.
Definition at line 290 of file multiway_merge.h.
References _GLIBCXX_CALL.
template<template< typename RAI, typename C > class iterator, typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Comparator > RandomAccessIterator3
__gnu_parallel::multiway_merge_4_variant (RandomAccessIteratorIterator
seqs_begin, RandomAccessIteratorIterator seqs_end,
RandomAccessIterator3 target, _DifferenceTp length, Comparator comp)
[inline]
Highly efficient 4-way merging procedure. Merging is done with the
algorithm implementation described by Peter Sanders. Basically, the
idea is to minimize the number of necessary comparison after merging
out an element. The implementation trick that makes this fast is that
the order of the sequences is stored in the instruction pointer
(translated into goto labels in C++).
This works well for merging up to 4 sequences.
Note that making the merging stable does not come at a performance hit.
Whether the merging is done guarded or unguarded is selected by the
used iterator class.
Parameters:
seqs_begin Begin iterator of iterator pair input sequence.
seqs_end End iterator of iterator pair input sequence.
target Begin iterator out output sequence.
comp Comparator.
length Maximum length to merge, less equal than the total number of
elements available.
Returns:
End iterator of output sequence.
Definition at line 410 of file multiway_merge.h.
References _GLIBCXX_CALL.
template<bool stable, typename RandomAccessIteratorIterator , typename
Comparator , typename difference_type > void
__gnu_parallel::multiway_merge_exact_splitting
(RandomAccessIteratorIterator seqs_begin, RandomAccessIteratorIterator
seqs_end, difference_type length, difference_type total_length,
Comparator comp, std::vector< std::pair< difference_type,
difference_type > > * pieces) [inline]
Exact splitting for parallel multiway-merge routine. None of the passed
sequences may be empty.
Definition at line 1181 of file multiway_merge.h.
References _GLIBCXX_PARALLEL_LENGTH, std::vector< _Tp, _Alloc
>::begin(), equally_split(), multiseq_partition(), and std::vector<
_Tp, _Alloc >::resize().
Referenced by parallel_merge_advance().
template<typename LT , typename RandomAccessIteratorIterator , typename
RandomAccessIterator3 , typename _DifferenceTp , typename Comparator >
RandomAccessIterator3 __gnu_parallel::multiway_merge_loser_tree
(RandomAccessIteratorIterator seqs_begin, RandomAccessIteratorIterator
seqs_end, RandomAccessIterator3 target, _DifferenceTp length,
Comparator comp) [inline]
Multi-way merging procedure for a high branching factor, guarded case.
This merging variant uses a LoserTree class as selected by LT.
Stability is selected through the used LoserTree class LT.
At least one non-empty sequence is required.
Parameters:
seqs_begin Begin iterator of iterator pair input sequence.
seqs_end End iterator of iterator pair input sequence.
target Begin iterator out output sequence.
comp Comparator.
length Maximum length to merge, less equal than the total number of
elements available.
Returns:
End iterator of output sequence.
Definition at line 534 of file multiway_merge.h.
References _GLIBCXX_CALL, and _GLIBCXX_PARALLEL_LENGTH.
template<typename UnguardedLoserTree , typename
RandomAccessIteratorIterator , typename RandomAccessIterator3 ,
typename _DifferenceTp , typename Comparator > RandomAccessIterator3
__gnu_parallel::multiway_merge_loser_tree_sentinel
(RandomAccessIteratorIterator seqs_begin, RandomAccessIteratorIterator
seqs_end, RandomAccessIterator3 target, const typename
std::iterator_traits< typename std::iterator_traits<
RandomAccessIteratorIterator >::value_type::first_type >::value_type &
sentinel, _DifferenceTp length, Comparator comp) [inline]
Multi-way merging procedure for a high branching factor, requiring
sentinels to exist. Parameters:
stable The value must the same as for the used LoserTrees.
UnguardedLoserTree Loser Tree variant to use for the unguarded
merging.
GuardedLoserTree Loser Tree variant to use for the guarded merging.
seqs_begin Begin iterator of iterator pair input sequence.
seqs_end End iterator of iterator pair input sequence.
target Begin iterator out output sequence.
comp Comparator.
length Maximum length to merge, less equal than the total number of
elements available.
Returns:
End iterator of output sequence.
Definition at line 705 of file multiway_merge.h.
References _GLIBCXX_CALL, is_sorted(), and
multiway_merge_loser_tree_unguarded().
template<typename LT , typename RandomAccessIteratorIterator , typename
RandomAccessIterator3 , typename _DifferenceTp , typename Comparator >
RandomAccessIterator3
__gnu_parallel::multiway_merge_loser_tree_unguarded
(RandomAccessIteratorIterator seqs_begin, RandomAccessIteratorIterator
seqs_end, RandomAccessIterator3 target, const typename
std::iterator_traits< typename std::iterator_traits<
RandomAccessIteratorIterator >::value_type::first_type >::value_type &
sentinel, _DifferenceTp length, Comparator comp) [inline]
Multi-way merging procedure for a high branching factor, unguarded
case. Merging is done using the LoserTree class LT.
Stability is selected by the used LoserTrees.
Precondition:
No input will run out of elements during the merge.
Parameters:
seqs_begin Begin iterator of iterator pair input sequence.
seqs_end End iterator of iterator pair input sequence.
target Begin iterator out output sequence.
comp Comparator.
length Maximum length to merge, less equal than the total number of
elements available.
Returns:
End iterator of output sequence.
Definition at line 615 of file multiway_merge.h.
References _GLIBCXX_CALL.
Referenced by multiway_merge_loser_tree_sentinel().
template<bool stable, typename RandomAccessIteratorIterator , typename
Comparator , typename difference_type > void
__gnu_parallel::multiway_merge_sampling_splitting
(RandomAccessIteratorIterator seqs_begin, RandomAccessIteratorIterator
seqs_end, difference_type length, difference_type total_length,
Comparator comp, std::vector< std::pair< difference_type,
difference_type > > * pieces) [inline]
Sampling based splitting for parallel multiway-merge routine.
Definition at line 1100 of file multiway_merge.h.
References _GLIBCXX_PARALLEL_LENGTH, __gnu_parallel::_Settings::get(),
and __gnu_parallel::_Settings::merge_oversampling.
template<typename RandomAccessIteratorPairIterator , typename
RandomAccessIteratorOut , typename _DifferenceTp , typename Comparator
> RandomAccessIteratorOut __gnu_parallel::multiway_merge_sentinels
(RandomAccessIteratorPairIterator seqs_begin,
RandomAccessIteratorPairIterator seqs_end, RandomAccessIteratorOut
target, _DifferenceTp length, Comparator comp,
__gnu_parallel::sequential_tag) [inline]
Multiway Merge Frontend. Merge the sequences specified by seqs_begin
and seqs_end into target. seqs_begin and seqs_end must point to a
sequence of pairs. These pairs must contain an iterator to the
beginning of a sequence in their first entry and an iterator the end of
the same sequence in their second entry.
Ties are broken arbitrarily. See stable_multiway_merge for a variant
that breaks ties by sequence number but is slower.
The first entries of the pairs (i.e. the begin iterators) will be moved
forward accordingly.
The output sequence has to provide enough space for all elements that
are written to it.
This function will merge the input sequences:
· not stable
· parallel, depending on the input size and Settings
· using sampling for splitting
· using sentinels
You have to take care that the element the end iterator points to is
readable and contains a value that is greater than any other non-
sentinel value in all sequences.
Example:
int sequences[10][11];
for (int i = 0; i < 10; ++i)
for (int j = 0; i < 11; ++j)
sequences[i][j] = j; // last one is sentinel!
int out[33];
std::vector<std::pair<int*> > seqs;
for (int i = 0; i < 10; ++i)
{ seqs.push(std::make_pair<int*>(sequences[i], sequences[i] + 10)) }
multiway_merge(seqs.begin(), seqs.end(), target, std::less<int>(), 33);
Precondition:
All input sequences must be sorted.
Target must provide enough space to merge out length elements or
the number of elements in all sequences, whichever is smaller.
For each i, seqs_begin[i].second must be the end marker of the
sequence, but also reference the one more sentinel element.
Postcondition:
[target, return value) contains merged elements from the input
sequences.
return value - target = min(length, number of elements in all
sequences).
See also:
stable_multiway_merge_sentinels
Parameters:
RandomAccessIteratorPairIterator iterator over sequence of pairs of
iterators
RandomAccessIteratorOut iterator over target sequence
_DifferenceTp difference type for the sequence
Comparator strict weak ordering type to compare elements in
sequences
seqs_begin begin of sequence sequence
seqs_end end of sequence sequence
target target sequence to merge to.
comp strict weak ordering to use for element comparison.
length Maximum length to merge, possibly larger than the number of
elements available.
Returns:
end iterator of output sequence
Definition at line 1849 of file multiway_merge.h.
References _GLIBCXX_CALL, and sequential_multiway_merge().
template<typename RandomAccessIterator , typename Comparator > bool
__gnu_parallel::operator< (unguarded_iterator< RandomAccessIterator,
Comparator > & bi1, unguarded_iterator< RandomAccessIterator,
Comparator > & bi2) [inline]
Compare two elements referenced by unguarded iterators. Parameters:
bi1 First iterator.
bi2 Second iterator.
Returns:
True if less.
Definition at line 239 of file multiway_merge.h.
template<typename RandomAccessIterator , typename Comparator > bool
__gnu_parallel::operator< (guarded_iterator< RandomAccessIterator,
Comparator > & bi1, guarded_iterator< RandomAccessIterator, Comparator
> & bi2) [inline]
Compare two elements referenced by guarded iterators. Parameters:
bi1 First iterator.
bi2 Second iterator.
Returns:
True if less.
Definition at line 144 of file multiway_merge.h.
template<typename RandomAccessIterator , typename Comparator > bool
__gnu_parallel::operator<= (unguarded_iterator< RandomAccessIterator,
Comparator > & bi1, unguarded_iterator< RandomAccessIterator,
Comparator > & bi2) [inline]
Compare two elements referenced by unguarded iterators. Parameters:
bi1 First iterator.
bi2 Second iterator.
Returns:
True if less equal.
Definition at line 252 of file multiway_merge.h.
template<typename RandomAccessIterator , typename Comparator > bool
__gnu_parallel::operator<= (guarded_iterator< RandomAccessIterator,
Comparator > & bi1, guarded_iterator< RandomAccessIterator, Comparator
> & bi2) [inline]
Compare two elements referenced by guarded iterators. Parameters:
bi1 First iterator.
bi2 Second iterator.
Returns:
True if less equal.
Definition at line 160 of file multiway_merge.h.
template<typename RandomAccessIterator1 , typename RandomAccessIterator3 ,
typename Comparator > RandomAccessIterator3
__gnu_parallel::parallel_merge_advance (RandomAccessIterator1 & begin1,
RandomAccessIterator1 end1, RandomAccessIterator1 & begin2,
RandomAccessIterator1 end2, RandomAccessIterator3 target, typename
std::iterator_traits< RandomAccessIterator1 >::difference_type
max_length, Comparator comp) [inline]
Parallel merge routine being able to merge only the max_length smallest
elements. The begin iterators are advanced accordingly, they might not
reach end, in contrast to the usual variant. The functionality is
projected onto parallel_multiway_merge.
Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence.
end2 End iterator of second sequence.
target Target begin iterator.
max_length Maximum number of elements to merge.
comp Comparator.
Returns:
Output end iterator.
Definition at line 228 of file merge.h.
References multiway_merge_exact_splitting(), and
parallel_multiway_merge().
template<typename RandomAccessIterator1 , typename RandomAccessIterator2 ,
typename RandomAccessIterator3 , typename Comparator >
RandomAccessIterator3 __gnu_parallel::parallel_merge_advance
(RandomAccessIterator1 & begin1, RandomAccessIterator1 end1,
RandomAccessIterator2 & begin2, RandomAccessIterator2 end2,
RandomAccessIterator3 target, typename std::iterator_traits<
RandomAccessIterator1 >::difference_type max_length, Comparator comp)
[inline]
Merge routine fallback to sequential in case the iterators of the two
input sequences are of different type. Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence.
end2 End iterator of second sequence.
target Target begin iterator.
max_length Maximum number of elements to merge.
comp Comparator.
Returns:
Output end iterator.
Definition at line 198 of file merge.h.
References merge_advance().
template<bool stable, bool sentinels, typename RandomAccessIteratorIterator
, typename RandomAccessIterator3 , typename _DifferenceTp , typename
Splitter , typename Comparator > RandomAccessIterator3
__gnu_parallel::parallel_multiway_merge (RandomAccessIteratorIterator
seqs_begin, RandomAccessIteratorIterator seqs_end,
RandomAccessIterator3 target, Splitter splitter, _DifferenceTp length,
Comparator comp, thread_index_t num_threads) [inline]
Parallel multi-way merge routine. The _GLIBCXX_PARALLEL_DECISION is
based on the branching factor and runtime settings.
Must not be called if the number of sequences is 1.
Parameters:
Splitter functor to split input (either exact or sampling based)
seqs_begin Begin iterator of iterator pair input sequence.
seqs_end End iterator of iterator pair input sequence.
target Begin iterator out output sequence.
comp Comparator.
length Maximum length to merge, possibly larger than the number of
elements available.
stable Stable merging incurs a performance penalty.
sentinel Ignored.
Returns:
End iterator of output sequence.
Definition at line 1286 of file multiway_merge.h.
References _GLIBCXX_CALL, _GLIBCXX_PARALLEL_LENGTH,
__gnu_parallel::_Settings::get(), is_sorted(), and
__gnu_parallel::_Settings::merge_oversampling.
Referenced by parallel_merge_advance().
template<typename RandomAccessIterator , typename Comparator > void
__gnu_parallel::parallel_nth_element (RandomAccessIterator begin,
RandomAccessIterator nth, RandomAccessIterator end, Comparator comp)
[inline]
Parallel implementation of std::nth_element(). Parameters:
begin Begin iterator of input sequence.
nth Iterator of element that must be in position afterwards.
end End iterator of input sequence.
comp Comparator.
Definition at line 330 of file partition.h.
References _GLIBCXX_CALL, __gnu_parallel::_Settings::get(), max(),
__gnu_parallel::_Settings::nth_element_minimal_n, parallel_partition(),
and __gnu_parallel::_Settings::partition_minimal_n.
Referenced by parallel_partial_sort().
template<typename RandomAccessIterator , typename Comparator > void
__gnu_parallel::parallel_partial_sort (RandomAccessIterator begin,
RandomAccessIterator middle, RandomAccessIterator end, Comparator comp)
[inline]
Parallel implementation of std::partial_sort(). Parameters:
begin Begin iterator of input sequence.
middle Sort until this position.
end End iterator of input sequence.
comp Comparator.
Definition at line 418 of file partition.h.
References parallel_nth_element().
template<typename InputIterator , typename OutputIterator , typename
BinaryOperation > OutputIterator __gnu_parallel::parallel_partial_sum
(InputIterator begin, InputIterator end, OutputIterator result,
BinaryOperation bin_op) [inline]
Parallel partial sum front-end. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
result Begin iterator of output sequence.
bin_op Associative binary function.
Returns:
End iterator of output sequence.
Definition at line 196 of file partial_sum.h.
References _GLIBCXX_CALL, __gnu_parallel::_Settings::get(), and
parallel_partial_sum_linear().
template<typename InputIterator , typename OutputIterator , typename
BinaryOperation > OutputIterator
__gnu_parallel::parallel_partial_sum_basecase (InputIterator begin,
InputIterator end, OutputIterator result, BinaryOperation bin_op,
typename std::iterator_traits< InputIterator >::value_type value)
[inline]
Base case prefix sum routine. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
result Begin iterator of output sequence.
bin_op Associative binary function.
value Start value. Must be passed since the neutral element is
unknown in general.
Returns:
End iterator of output sequence.
Definition at line 58 of file partial_sum.h.
Referenced by parallel_partial_sum_linear().
template<typename InputIterator , typename OutputIterator , typename
BinaryOperation > OutputIterator
__gnu_parallel::parallel_partial_sum_linear (InputIterator begin,
InputIterator end, OutputIterator result, BinaryOperation bin_op,
typename std::iterator_traits< InputIterator >::difference_type n)
[inline]
Parallel partial sum implementation, two-phase approach, no recursion.
Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
result Begin iterator of output sequence.
bin_op Associative binary function.
n Length of sequence.
num_threads Number of threads to use.
Returns:
End iterator of output sequence.
Definition at line 90 of file partial_sum.h.
References equally_split(), __gnu_parallel::_Settings::get(),
parallel_partial_sum_basecase(), and
__gnu_parallel::_Settings::partial_sum_dilation.
Referenced by parallel_partial_sum().
template<typename RandomAccessIterator , typename Predicate >
std::iterator_traits<RandomAccessIterator>::difference_type
__gnu_parallel::parallel_partition (RandomAccessIterator begin,
RandomAccessIterator end, Predicate pred, thread_index_t num_threads)
[inline]
Parallel implementation of std::partition. Parameters:
begin Begin iterator of input sequence to split.
end End iterator of input sequence to split.
pred Partition predicate, possibly including some kind of pivot.
num_threads Maximum number of threads to use for this task.
Returns:
Number of elements not fulfilling the predicate.
Definition at line 55 of file partition.h.
References _GLIBCXX_CALL, _GLIBCXX_VOLATILE,
__gnu_parallel::_Settings::get(), std::left(),
__gnu_parallel::_Settings::partition_chunk_share,
__gnu_parallel::_Settings::partition_chunk_size, and std::right().
Referenced by parallel_nth_element(), parallel_sort_qs_divide(), and
qsb_divide().
template<typename RandomAccessIterator , typename RandomNumberGenerator >
void __gnu_parallel::parallel_random_shuffle (RandomAccessIterator
begin, RandomAccessIterator end, RandomNumberGenerator rng =
random_number()) [inline]
Parallel random public call. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
rng Random number generator to use.
Definition at line 507 of file random_shuffle.h.
References parallel_random_shuffle_drs().
template<typename RandomAccessIterator , typename RandomNumberGenerator >
void __gnu_parallel::parallel_random_shuffle_drs (RandomAccessIterator
begin, RandomAccessIterator end, typename std::iterator_traits<
RandomAccessIterator >::difference_type n, thread_index_t num_threads,
RandomNumberGenerator & rng) [inline]
Main parallel random shuffle step. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
n Length of sequence.
num_threads Number of threads to use.
rng Random number generator to use.
Definition at line 258 of file random_shuffle.h.
References __log2(), _GLIBCXX_CALL,
__gnu_parallel::DRandomShufflingGlobalData< RandomAccessIterator
>::bin_proc, __gnu_parallel::DRSSorterPU< RandomAccessIterator,
RandomNumberGenerator >::bins_begin, __gnu_parallel::DRSSorterPU<
RandomAccessIterator, RandomNumberGenerator >::bins_end,
__gnu_parallel::DRandomShufflingGlobalData< RandomAccessIterator
>::dist, __gnu_parallel::_Settings::L2_cache_size, std::min(),
__gnu_parallel::DRandomShufflingGlobalData< RandomAccessIterator
>::num_bins, __gnu_parallel::DRandomShufflingGlobalData<
RandomAccessIterator >::num_bits, __gnu_parallel::DRSSorterPU<
RandomAccessIterator, RandomNumberGenerator >::num_threads,
parallel_random_shuffle_drs_pu(), round_up_to_pow2(),
__gnu_parallel::DRSSorterPU< RandomAccessIterator,
RandomNumberGenerator >::sd, __gnu_parallel::DRSSorterPU<
RandomAccessIterator, RandomNumberGenerator >::seed,
sequential_random_shuffle(),
__gnu_parallel::DRandomShufflingGlobalData< RandomAccessIterator
>::starts, __gnu_parallel::DRandomShufflingGlobalData<
RandomAccessIterator >::temporaries, and
__gnu_parallel::_Settings::TLB_size.
Referenced by parallel_random_shuffle().
template<typename RandomAccessIterator , typename RandomNumberGenerator >
void __gnu_parallel::parallel_random_shuffle_drs_pu (DRSSorterPU<
RandomAccessIterator, RandomNumberGenerator > * pus) [inline]
Random shuffle code executed by each thread. Parameters:
pus Array of thread-local data records.
Definition at line 122 of file random_shuffle.h.
References __gnu_parallel::DRandomShufflingGlobalData<
RandomAccessIterator >::dist,
__gnu_parallel::DRandomShufflingGlobalData< RandomAccessIterator
>::num_bins, __gnu_parallel::DRandomShufflingGlobalData<
RandomAccessIterator >::num_bits, __gnu_parallel::DRSSorterPU<
RandomAccessIterator, RandomNumberGenerator >::num_threads,
random_number_pow2(), __gnu_parallel::DRSSorterPU<
RandomAccessIterator, RandomNumberGenerator >::sd,
__gnu_parallel::DRSSorterPU< RandomAccessIterator,
RandomNumberGenerator >::seed, and
__gnu_parallel::DRandomShufflingGlobalData< RandomAccessIterator
>::starts.
Referenced by parallel_random_shuffle_drs().
template<bool stable, typename RandomAccessIterator , typename Comparator >
void __gnu_parallel::parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, parallel_tag parallelism)
[inline]
Choose a parallel sorting algorithm. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
comp Comparator.
stable Sort stable.
Definition at line 196 of file sort.h.
References _GLIBCXX_CALL, __gnu_parallel::_Settings::get(),
__gnu_parallel::parallel_tag::get_num_threads(), parallel_sort_qs(),
and parallel_sort_qsb().
template<bool stable, typename RandomAccessIterator , typename Comparator >
void __gnu_parallel::parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, default_parallel_tag
parallelism) [inline]
Choose multiway mergesort with exact splitting, for parallel sorting.
Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
comp Comparator.
Definition at line 175 of file sort.h.
References _GLIBCXX_CALL, and
__gnu_parallel::parallel_tag::get_num_threads().
template<bool stable, typename RandomAccessIterator , typename Comparator >
void __gnu_parallel::parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, balanced_quicksort_tag
parallelism) [inline]
Choose balanced quicksort for parallel sorting. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
comp Comparator.
stable Sort stable.
Definition at line 154 of file sort.h.
References _GLIBCXX_CALL,
__gnu_parallel::parallel_tag::get_num_threads(), and
parallel_sort_qsb().
template<bool stable, typename RandomAccessIterator , typename Comparator >
void __gnu_parallel::parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, quicksort_tag parallelism)
[inline]
Choose quicksort for parallel sorting. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
comp Comparator.
Definition at line 134 of file sort.h.
References _GLIBCXX_CALL,
__gnu_parallel::parallel_tag::get_num_threads(), and
parallel_sort_qs().
template<bool stable, typename RandomAccessIterator , typename Comparator >
void __gnu_parallel::parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp,
multiway_mergesort_sampling_tag parallelism) [inline]
Choose multiway mergesort with splitting by sampling, for parallel
sorting. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
comp Comparator.
Definition at line 116 of file sort.h.
References _GLIBCXX_CALL, and
__gnu_parallel::parallel_tag::get_num_threads().
template<bool stable, typename RandomAccessIterator , typename Comparator >
void __gnu_parallel::parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, multiway_mergesort_exact_tag
parallelism) [inline]
Choose multiway mergesort with exact splitting, for parallel sorting.
Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
comp Comparator.
Definition at line 97 of file sort.h.
References _GLIBCXX_CALL, and
__gnu_parallel::parallel_tag::get_num_threads().
template<bool stable, typename RandomAccessIterator , typename Comparator >
void __gnu_parallel::parallel_sort (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, multiway_mergesort_tag
parallelism) [inline]
Choose multiway mergesort, splitting variant at run-time, for parallel
sorting. Parameters:
begin Begin iterator of input sequence.
end End iterator of input sequence.
comp Comparator.
Definition at line 74 of file sort.h.
References _GLIBCXX_CALL, __gnu_parallel::_Settings::get(), and
__gnu_parallel::parallel_tag::get_num_threads().
template<bool stable, bool exact, typename RandomAccessIterator , typename
Comparator > void __gnu_parallel::parallel_sort_mwms
(RandomAccessIterator begin, RandomAccessIterator end, Comparator comp,
thread_index_t num_threads) [inline]
PMWMS main call. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
comp Comparator.
n Length of sequence.
num_threads Number of threads to use.
Definition at line 398 of file multiway_mergesort.h.
References _GLIBCXX_CALL, __gnu_parallel::_Settings::get(),
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::num_threads,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::offsets,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::pieces,
std::vector< _Tp, _Alloc >::resize(), __gnu_parallel::PMWMSSortingData<
RandomAccessIterator >::samples,
__gnu_parallel::_Settings::sort_mwms_oversampling,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::source,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::starts, and
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::temporary.
template<bool stable, bool exact, typename RandomAccessIterator , typename
Comparator > void __gnu_parallel::parallel_sort_mwms_pu
(PMWMSSortingData< RandomAccessIterator > * sd, Comparator & comp)
[inline]
PMWMS code executed by each thread. Parameters:
sd Pointer to algorithm data.
comp Comparator.
Definition at line 315 of file multiway_mergesort.h.
References std::vector< _Tp, _Alloc >::begin(), std::vector< _Tp,
_Alloc >::end(), __gnu_parallel::_Settings::get(),
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::num_threads,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::pieces,
__gnu_parallel::_Settings::sort_mwms_oversampling,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::source,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::starts,
__gnu_parallel::PMWMSSortingData< RandomAccessIterator >::temporary,
and std::uninitialized_copy().
template<typename RandomAccessIterator , typename Comparator > void
__gnu_parallel::parallel_sort_qs (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, thread_index_t num_threads)
[inline]
Unbalanced quicksort main call. Parameters:
begin Begin iterator of input sequence.
end End iterator input sequence, ignored.
comp Comparator.
num_threads Number of threads that are allowed to work on this
part.
Definition at line 157 of file quicksort.h.
References _GLIBCXX_CALL, and parallel_sort_qs_conquer().
Referenced by parallel_sort().
template<typename RandomAccessIterator , typename Comparator > void
__gnu_parallel::parallel_sort_qs_conquer (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, thread_index_t num_threads)
[inline]
Unbalanced quicksort conquer step. Parameters:
begin Begin iterator of subsequence.
end End iterator of subsequence.
comp Comparator.
num_threads Number of threads that are allowed to work on this
part.
Definition at line 101 of file quicksort.h.
References __gnu_parallel::_Settings::get(), and
parallel_sort_qs_divide().
Referenced by parallel_sort_qs().
template<typename RandomAccessIterator , typename Comparator >
std::iterator_traits<RandomAccessIterator>::difference_type
__gnu_parallel::parallel_sort_qs_divide (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, typename
std::iterator_traits< RandomAccessIterator >::difference_type
pivot_rank, typename std::iterator_traits< RandomAccessIterator
>::difference_type num_samples, thread_index_t num_threads) [inline]
Unbalanced quicksort divide step. Parameters:
begin Begin iterator of subsequence.
end End iterator of subsequence.
comp Comparator.
pivot_rank Desired rank of the pivot.
num_samples Choose pivot from that many samples.
num_threads Number of threads that are allowed to work on this
part.
Definition at line 51 of file quicksort.h.
References min(), and parallel_partition().
Referenced by parallel_sort_qs_conquer().
template<typename RandomAccessIterator , typename Comparator > void
__gnu_parallel::parallel_sort_qsb (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, thread_index_t num_threads)
[inline]
Top-level quicksort routine. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
comp Comparator.
num_threads Number of threads that are allowed to work on this
part.
Definition at line 418 of file balanced_quicksort.h.
References _GLIBCXX_CALL, and qsb_conquer().
Referenced by parallel_sort().
template<typename InputIterator , class OutputIterator > OutputIterator
__gnu_parallel::parallel_unique_copy (InputIterator first,
InputIterator last, OutputIterator result) [inline]
Parallel std::unique_copy(), without explicit equality predicate.
Parameters:
first Begin iterator of input sequence.
last End iterator of input sequence.
result Begin iterator of result sequence.
Returns:
End iterator of result sequence.
Definition at line 181 of file unique_copy.h.
References parallel_unique_copy().
template<typename InputIterator , class OutputIterator , class
BinaryPredicate > OutputIterator __gnu_parallel::parallel_unique_copy
(InputIterator first, InputIterator last, OutputIterator result,
BinaryPredicate binary_pred) [inline]
Parallel std::unique_copy(), w/o explicit equality predicate.
Parameters:
first Begin iterator of input sequence.
last End iterator of input sequence.
result Begin iterator of result sequence.
binary_pred Equality predicate.
Returns:
End iterator of result sequence.
Definition at line 51 of file unique_copy.h.
References _GLIBCXX_CALL, and equally_split().
Referenced by parallel_unique_copy().
template<typename RandomAccessIterator , typename Comparator > void
__gnu_parallel::qsb_conquer (QSBThreadLocal< RandomAccessIterator > **
tls, RandomAccessIterator begin, RandomAccessIterator end, Comparator
comp, thread_index_t iam, thread_index_t num_threads, bool parent_wait)
[inline]
Quicksort conquer step. Parameters:
tls Array of thread-local storages.
begin Begin iterator of subsequence.
end End iterator of subsequence.
comp Comparator.
iam Number of the thread processing this function.
num_threads Number of threads that are allowed to work on this
part.
Definition at line 163 of file balanced_quicksort.h.
References __gnu_parallel::QSBThreadLocal< RandomAccessIterator
>::elements_leftover, __gnu_parallel::QSBThreadLocal<
RandomAccessIterator >::initial, qsb_divide(), and
qsb_local_sort_with_helping().
Referenced by parallel_sort_qsb().
template<typename RandomAccessIterator , typename Comparator >
std::iterator_traits<RandomAccessIterator>::difference_type
__gnu_parallel::qsb_divide (RandomAccessIterator begin,
RandomAccessIterator end, Comparator comp, thread_index_t num_threads)
[inline]
Balanced quicksort divide step. Parameters:
begin Begin iterator of subsequence.
end End iterator of subsequence.
comp Comparator.
num_threads Number of threads that are allowed to work on this
part.
Precondition:
(end-begin)>=1
Definition at line 100 of file balanced_quicksort.h.
References median_of_three_iterators(), and parallel_partition().
Referenced by qsb_conquer().
template<typename RandomAccessIterator , typename Comparator > void
__gnu_parallel::qsb_local_sort_with_helping (QSBThreadLocal<
RandomAccessIterator > ** tls, Comparator & comp, int iam, bool wait)
[inline]
Quicksort step doing load-balanced local sort. Parameters:
tls Array of thread-local storages.
comp Comparator.
iam Number of the thread processing this function.
Definition at line 239 of file balanced_quicksort.h.
References _GLIBCXX_ASSERTIONS, __gnu_parallel::QSBThreadLocal<
RandomAccessIterator >::elements_leftover,
__gnu_parallel::_Settings::get(), __gnu_parallel::QSBThreadLocal<
RandomAccessIterator >::initial, __gnu_parallel::QSBThreadLocal<
RandomAccessIterator >::leftover_parts, __gnu_parallel::QSBThreadLocal<
RandomAccessIterator >::num_threads,
__gnu_parallel::RestrictedBoundedConcurrentQueue< T >::pop_front(),
__gnu_parallel::RestrictedBoundedConcurrentQueue< T >::push_front(),
__gnu_parallel::_Settings::sort_qsb_base_case_maximal_n, and yield().
Referenced by qsb_conquer().
template<typename RandomNumberGenerator > int
__gnu_parallel::random_number_pow2 (int logp, RandomNumberGenerator &
rng) [inline]
Generate a random number in [0,2^logp). Parameters:
logp Logarithm (basis 2) of the upper range bound.
rng Random number generator to use.
Definition at line 115 of file random_shuffle.h.
Referenced by parallel_random_shuffle_drs_pu(), and
sequential_random_shuffle().
template<typename T > T __gnu_parallel::round_up_to_pow2 (T x) [inline]
Round up to the next greater power of 2. Parameters:
x Integer to round up
Definition at line 241 of file random_shuffle.h.
References __log2().
Referenced by parallel_random_shuffle_drs(), and
sequential_random_shuffle().
template<typename _RandomAccessIterator1 , typename _RandomAccessIterator2
, typename Pred > _RandomAccessIterator1
__gnu_parallel::search_template (_RandomAccessIterator1 begin1,
_RandomAccessIterator1 end1, _RandomAccessIterator2 begin2,
_RandomAccessIterator2 end2, Pred pred) [inline]
Parallel std::search. Parameters:
begin1 Begin iterator of first sequence.
end1 End iterator of first sequence.
begin2 Begin iterator of second sequence.
end2 End iterator of second sequence.
pred Find predicate.
Returns:
Place of finding in first sequences.
Definition at line 82 of file search.h.
References _GLIBCXX_CALL, calc_borders(), equally_split(), and min().
template<bool stable, bool sentinels, typename RandomAccessIteratorIterator
, typename RandomAccessIterator3 , typename _DifferenceTp , typename
Comparator > RandomAccessIterator3
__gnu_parallel::sequential_multiway_merge (RandomAccessIteratorIterator
seqs_begin, RandomAccessIteratorIterator seqs_end,
RandomAccessIterator3 target, const typename std::iterator_traits<
typename std::iterator_traits< RandomAccessIteratorIterator
>::value_type::first_type >::value_type & sentinel, _DifferenceTp
length, Comparator comp) [inline]
Sequential multi-way merging switch. The _GLIBCXX_PARALLEL_DECISION is
based on the branching factor and runtime settings.
Parameters:
seqs_begin Begin iterator of iterator pair input sequence.
seqs_end End iterator of iterator pair input sequence.
target Begin iterator out output sequence.
comp Comparator.
length Maximum length to merge, possibly larger than the number of
elements available.
stable Stable merging incurs a performance penalty.
sentinel The sequences have a sentinel element.
Returns:
End iterator of output sequence.
Definition at line 979 of file multiway_merge.h.
References _GLIBCXX_CALL, _GLIBCXX_PARALLEL_LENGTH, is_sorted(), and
merge_advance().
Referenced by multiway_merge(), and multiway_merge_sentinels().
template<typename RandomAccessIterator , typename RandomNumberGenerator >
void __gnu_parallel::sequential_random_shuffle (RandomAccessIterator
begin, RandomAccessIterator end, RandomNumberGenerator & rng) [inline]
Sequential cache-efficient random shuffle. Parameters:
begin Begin iterator of sequence.
end End iterator of sequence.
rng Random number generator to use.
Definition at line 394 of file random_shuffle.h.
References __log2(), __gnu_parallel::_Settings::L2_cache_size,
std::min(), random_number_pow2(), round_up_to_pow2(), and
__gnu_parallel::_Settings::TLB_size.
Referenced by parallel_random_shuffle_drs().
template<typename InputIterator > void __gnu_parallel::shrink (std::vector<
InputIterator > & os_starts, size_t & count_to_two, size_t &
range_length) [inline]
Combines two ranges into one and thus halves the number of ranges.
Parameters:
os_starts Start positions worked on (oversampled).
count_to_two Counts up to 2.
range_length Current length of a chunk.
Definition at line 70 of file list_partition.h.
References std::vector< _Tp, _Alloc >::size().
Referenced by shrink_and_double().
template<typename InputIterator > void __gnu_parallel::shrink_and_double
(std::vector< InputIterator > & os_starts, size_t & count_to_two,
size_t & range_length, const bool make_twice) [inline]
Shrinks and doubles the ranges. Parameters:
os_starts Start positions worked on (oversampled).
count_to_two Counts up to 2.
range_length Current length of a chunk.
make_twice Whether the os_starts is allowed to be grown or not
Definition at line 50 of file list_partition.h.
References std::vector< _Tp, _Alloc >::resize(), shrink(), and
std::vector< _Tp, _Alloc >::size().
Referenced by list_partition().
void __gnu_parallel::yield () [inline]
Yield the control to another thread, without waiting for the end to the
time slice.
Definition at line 340 of file parallel/compatibility.h.
Referenced by for_each_template_random_access_workstealing(), and
qsb_local_sort_with_helping().
Variable Documentation
const int __gnu_parallel::lcas_t_bits [static]
Number of bits of lcas_t.
Definition at line 149 of file types.h.
Referenced by decode2(), and encode2().
const lcas_t __gnu_parallel::lcas_t_mask [static]
lcas_t with the right half of bits set to 1.
Definition at line 152 of file types.h.
Referenced by decode2().
Author
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libstdc++ 22 Nov 2013 __gnu_parallel(3)
