ck_pr_fence_load_atomic man page on DragonFly
[printable version]
CK_PR_FENCE_LOAD_ATOM... BSD Library Functions Manual CK_PR_FENCE_LOAD_ATOM...
NAME
ck_pr_fence_load_atomic — enforce ordering of load operations to atomic
read-modify-write operations
LIBRARY
Concurrency Kit (libck, -lck)
SYNOPSIS
#include <ck_pr.h>
void
ck_pr_fence_load_atomic(void);
void
ck_pr_fence_strict_load_atomic(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_atomic() 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 instructions will be emitted. To force the unconditional emission
of a load fence, use ck_pr_fence_strict_load_atomic(). 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_b;
snapshot_a = ck_pr_load_uint(&a);
/*
* Guarantee that the load from "a" completes
* before the update to "b".
*/
ck_pr_fence_load_atomic();
ck_pr_fas_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_store(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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