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 enforces 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 compiler 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/