ck_pr_fence_memory man page on DragonFly
[printable version]
ck_pr_fence_memory(3) BSD Library Functions Manual ck_pr_fence_memory(3)
NAME
ck_pr_fence_memory — enforce partial ordering of all memory operations
LIBRARY
Concurrency Kit (libck, -lck)
SYNOPSIS
#include <ck_pr.h>
void
ck_pr_fence_memory();
void
ck_pr_fence_strict_memory();
DESCRIPTION
The ck_pr_fence_memory(3) function enforces the ordering of any memory
operations with respect to the invocation of the function. This function
always serves as an implicit compiler barrier. Achitectures implementing
CK_MD_TSO do not emit a barrier, but compiler barrier semantics remain.
Architectures implementing CK_MD_PSO and CK_MD_RMO always emit an
instructions which provides the specified ordering guarantees. To force
the unconditional emission of a memory fence, use
ck_pr_fence_strict_memory().
EXAMPLE
#include <ck_pr.h>
static int a = 0;
static int b;
static int c;
static int d;
void
function(void)
{
int snapshot_a;
ck_pr_store_int(&b, 1);
snapshot_a = ck_pr_load_int(&a);
/*
* Make sure previous memory operations are
* ordered with respect to memory operations
* following the ck_pr_fence_memory.
*/
ck_pr_fence_memory();
ck_pr_store_int(&d, 3);
ck_pr_store_int(&c, 2);
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_atomic_load(3), ck_pr_fence_load(3),
ck_pr_fence_load_depends(3), ck_pr_fence_store(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/
April 7, 2013
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