ck_pr_fence_memory man page

ck_pr_fence_memory ā€” enforce partial ordering of all memory operations

Library

Concurrency Kit (libck, -lck)

Synopsis

#include <ck_pr.h>

void
ck_pr_fence_memory();

void
ck_pr_fence_strict_memory();

Description

The ck_pr_fence_memory(3) function enforces the ordering of any memory operations with respect to the invocation of the function. This function always serves as an implicit compiler barrier. Achitectures implementing CK_MD_TSO do not emit a barrier, but compiler barrier semantics remain. Architectures implementing CK_MD_PSO and CK_MD_RMO always emit an instructions which provides the specified ordering guarantees. To force the unconditional emission of a memory fence, use ck_pr_fence_strict_memory().

Example


#include <ck_pr.h> 
 
static int a = 0; 
static int b; 
static int c; 
static int d; 
 
void 
function(void) 
{ 
	int snapshot_a; 
 
	ck_pr_store_int(&b, 1); 
	snapshot_a = ck_pr_load_int(&a); 
 
	/* 
	 * Make sure previous memory operations are 
	 * ordered with respect to memory operations 
	 * following the ck_pr_fence_memory. 
	 */ 
	ck_pr_fence_memory(); 
 
	ck_pr_store_int(&d, 3); 
	ck_pr_store_int(&c, 2); 
 
	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(3), ck_pr_fence_load_depends(3), ck_pr_fence_store(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/

Referenced By

ck_pr(3), ck_pr_add(3), ck_pr_and(3), ck_pr_barrier(3), ck_pr_btc(3), ck_pr_btr(3), ck_pr_bts(3), ck_pr_cas(3), ck_pr_dec(3), ck_pr_faa(3), ck_pr_fas(3), ck_pr_fence_acquire(3), ck_pr_fence_atomic(3), ck_pr_fence_atomic_load(3), ck_pr_fence_atomic_store(3), ck_pr_fence_load(3), ck_pr_fence_load_atomic(3), ck_pr_fence_load_depends(3), ck_pr_fence_load_store(3), ck_pr_fence_release(3), ck_pr_fence_store(3), ck_pr_fence_store_atomic(3), ck_pr_fence_store_load(3), ck_pr_inc(3), ck_pr_load(3), ck_pr_neg(3), ck_pr_not(3), ck_pr_or(3), ck_pr_rtm(3), ck_pr_stall(3), ck_pr_store(3), ck_pr_sub(3), ck_pr_xor(3).

April 7, 2013