ck_pr_fence_memory(3)

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.