NAME¶
ck_pr_stall
—
busy-wait primitive
LIBRARY¶
Concurrency Kit (libck, -lck)
SYNOPSIS¶
#include
<ck_pr.h>
void
ck_pr_stall
(
void);
DESCRIPTION¶
The
ck_pr_stall
(
3)
function should be used inside retry paths of busy-wait loops. It not only
serves as a compiler barrier, but on some architectures it emits cycle-saving
instructions.
EXAMPLE¶
#include <ck_pr.h>
static int ready = 0;
void
function(void)
{
/* Busy-wait until ready is non-zero. */
while (ck_pr_load_int(&ready) == 0)
ck_pr_stall();
return;
}
SEE ALSO¶
ck_pr_fence_load(3),
ck_pr_fence_load_depends(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/