ck_pr_fence_atomic_load man page on DragonFly
[printable version]
CK_PR_FENCE_ATOMIC_LO... BSD Library Functions Manual CK_PR_FENCE_ATOMIC_LO...
NAME
ck_pr_fence_atomic_load — enforce ordering of atomic read-modify-write
operations to load operations
LIBRARY
Concurrency Kit (libck, -lck)
SYNOPSIS
#include <ck_pr.h>
void
ck_pr_fence_atomic_load(void);
void
ck_pr_fence_strict_atomic_load(void);
DESCRIPTION
The ck_pr_fence_atomic_load() function enfores the ordering of any atomic
read-modify-write operations relative to any load operations following
the function invocation. This function always serve as an implicit com‐
piler barrier. On architectures implementing CK_MD_TSO, this operation
only serves as a compiler barrier and no fences are emitted. To force the
unconditional emission of a fence, use ck_pr_fence_strict_atomic_load().
EXAMPLE
#include <ck_pr.h>
static int a = 0;
static int b = 0;
void
function(void)
{
int c;
ck_pr_fas_int(&a, 1);
/*
* Guarantee that the update to a is completed
* with respect to the load of *b.
*/
ck_pr_fence_atomic_load();
c = ck_pr_load_int(&b);
return;
}
RETURN VALUES
This function has no return value.
SEE ALSO
ck_pr_stall(3), ck_pr_fence_atomic(3), ck_pr_fence_atomic_store(3),
ck_pr_fence_store(3), ck_pr_fence_load(3), ck_pr_fence_load_atomic(3),
ck_pr_fence_load_store(3), ck_pr_fence_load_depends(3),
ck_pr_fence_memory(3), ck_pr_barrier(3), ck_pr_fas(3), ck_pr_load(3),
ck_pr_store(3), ck_pr_faa(3), ck_pr_inc(3), ck_pr_dec(3), ck_pr_neg(3),
ck_pr_not(3), ck_pr_add(3), ck_pr_sub(3), ck_pr_and(3), ck_pr_or(3),
ck_pr_xor(3), ck_pr_cas(3), ck_pr_btc(3), ck_pr_bts(3), ck_pr_btr(3)
Additional information available at http://concurrencykit.org/
May 16, 2013
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