ck_pr_fence_memory (3) - Linux Manuals

ck_pr_fence_memory: enforce partial ordering of all memory operations

NAME

ck_pr_fence_memory - enforce partial ordering of all memory operations

LIBRARY

Concurrency Kit (libck, -lck)

SYNOPSIS

In ck_pr.h Ft void Fn ck_pr_fence_memory Ft void Fn ck_pr_fence_strict_memory

DESCRIPTION

The Fn 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 Fn 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.