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 enforces 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 architectures 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 unconditional 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 CK_PR_FENCE_ATOMIC(3)