ck_pr_stall man page on DragonFly
[printable version]
ck_pr_stall(3) BSD Library Functions Manual ck_pr_stall(3)
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 archi‐
tectures 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/
April 7, 2013
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