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.