ck_pr_fence_atomic man page on DragonFly
[printable version]
CK_PR_FENCE_ATOMIC(3) BSD Library Functions Manual CK_PR_FENCE_ATOMIC(3)
NAME
ck_pr_fence_atomic — enforce partial ordering of atomic read-modify-write
operations
LIBRARY
Concurrency Kit (libck, -lck)
SYNOPSIS
#include <ck_pr.h>
void
ck_pr_fence_atomic(void);
void
ck_pr_fence_strict_atomic(void);
DESCRIPTION
The ck_pr_fence_atomic() function enfores the ordering of any atomic
read-modify-write operations relative to the invocation of the function.
This function always serve as an implicit compiler barrier. On architec‐
tures implementing CK_MD_TSO, this operation only serves as a compiler
barrier and no fences are emitted. On architectures implementing
CK_MD_PSO and CK_MD_RMO, a store fence is emitted. To force the uncondi‐
tional emission of a fence, use ck_pr_fence_strict_atomic().
EXAMPLE
#include <ck_pr.h>
static int a = 0;
static int b = 0;
static int c = 0;
void
function(void)
{
ck_pr_fas_int(&a, 1);
/*
* Guarantee that the update to a is completed
* with respect to the updates of b and c.
*/
ck_pr_fence_atomic();
ck_pr_fas_int(&b, 2);
ck_pr_fas_int(&c, 2);
return;
}
RETURN VALUES
This function has no return value.
SEE ALSO
ck_pr_stall(3), ck_pr_fence_atomic_store(3), ck_pr_fence_atomic_load(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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