ck_pr_fence_atomic (3) - Linux Manuals

ck_pr_fence_atomic: enforce partial ordering of atomic read-modify-write operations

NAME

ck_pr_fence_atomic - enforce partial ordering of atomic read-modify-write operations

LIBRARY

Concurrency Kit (libck, -lck)

SYNOPSIS

In ck_pr.h Ft void Fn ck_pr_fence_atomic void Ft void Fn ck_pr_fence_strict_atomic void

DESCRIPTION

The Fn 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 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 Fn 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.