ck_pr_fence_load (3) - Linux Manuals

ck_pr_fence_load: enforce partial ordering of load operations

NAME

ck_pr_fence_load - enforce partial ordering of load operations

LIBRARY

Concurrency Kit (libck, -lck)

SYNOPSIS

In ck_pr.h Ft void Fn ck_pr_fence_load void Ft void Fn ck_pr_fence_strict_load void

DESCRIPTION

This function enforces the ordering of any memory load and Fn ck_pr_load 3 operations relative to the invocation of the function. Any store operations that were committed on remote processors and received by the calling processor before the invocation of Fn ck_pr_fence_load is also be made visible only after a call to Fn ck_pr_fence_load . This function always serves as an implicit compiler barrier. On architectures with CK_MD_TSO or CK_MD_PSO specified (total store ordering and partial store ordering respectively), this operation only serves as a compiler barrier and no fence instructions will be emitted. To force the unconditional emission of a load fence, use Fn ck_pr_fence_strict_load . Architectures implementing CK_MD_RMO always emit a load fence.

EXAMPLE

#include <ck_pr.h>

static unsigned int a;
static unsigned int b;

void
function(void)
{
        unsigned int snapshot_a, snapshot_b;

        snapshot_a = ck_pr_load_uint(&a);

        /*
         * Guarantee that the load from "a" completes
         * before the load from "b".
         */
        ck_pr_fence_load();
        snapshot_b = ck_pr_load_uint(&b);

        return;
}

RETURN VALUES

This function has no return value.