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/