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| ck_pr_stall(3) | FreeBSD 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
Theck_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/
| April 7, 2013 |
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