ck_pr_fence_load_store man page on DragonFly
[printable version]
CK_PR_FENCE_LOAD_STOR... BSD Library Functions Manual CK_PR_FENCE_LOAD_STOR...
NAME
ck_pr_fence_load_store — enforce ordering of load operations to store
operations
LIBRARY
Concurrency Kit (libck, -lck)
SYNOPSIS
#include <ck_pr.h>
void
ck_pr_fence_load_store(void);
void
ck_pr_fence_strict_load_store(void);
DESCRIPTION
This function enforces the ordering of any memory load and ck_pr_load(3)
operations with respect to store operations relative to the invocation of
the function. Any store operations that were committed on remote proces‐
sors and received by the calling processor before the invocation of
ck_pr_fence_load_store() is also be made visible only after a call to the
ck_pr_fence_load family of functions. 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 instruc‐
tions will be emitted. To force the unconditional emission of a load
fence, use ck_pr_fence_strict_load_store(). Architectures implementing
CK_MD_RMO always emit a fence.
EXAMPLE
#include <ck_pr.h>
static unsigned int a;
static unsigned int b;
void
function(void)
{
unsigned int snapshot_a;
snapshot_a = ck_pr_load_uint(&a);
/*
* Guarantee that the load from "a" completes
* before the store to "b".
*/
ck_pr_fence_load_store();
ck_pr_store_uint(&b, 1);
return;
}
RETURN VALUES
This function has no return value.
SEE ALSO
ck_pr_stall(3), ck_pr_fence_atomic(3), ck_pr_fence_atomic_store(3),
ck_pr_fence_atomic_load(3), ck_pr_fence_load_depends(3),
ck_pr_fence_load_atomic(3), ck_pr_fence_store(3), ck_pr_fence_memory(3),
ck_pr_barrier(3), ck_pr_fas(3), ck_pr_load(3), ck_pr_store(3),
ck_pr_faa(3), ck_pr_inc(3), ck_pr_dec(3), ck_pr_neg(3), ck_pr_not(3),
ck_pr_add(3), ck_pr_sub(3), ck_pr_and(3), ck_pr_or(3), ck_pr_xor(3),
ck_pr_cas(3), ck_pr_btc(3), ck_pr_bts(3), ck_pr_btr(3)
Additional information available at http://concurrencykit.org/
May 18, 2013
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