osx man page for osmemorybarrier

Query: osmemorybarrier

OS: osx

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

BARRIER(3)						   BSD Library Functions Manual 						BARRIER(3)

NAME
OSMemoryBarrier -- memory barrier to order loads and stores
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <libkern/OSAtomic.h> void OSMemoryBarrier(void);
DESCRIPTION
OSMemoryBarrier() strictly orders memory accesses in a weakly ordered memory model such as with PowerPC, by creating a barrier. All loads and stores executed in sequential program order before the barrier will complete with respect to the memory coherence mechanism, before any load or store executed after the barrier. Used with an atomic operation, the barrier can be used to create custom synchronization protocols as an alternative to the spinlock or queue/dequeue operations. Note that this barrier does not order uncached loads and stores. On a uniprocessor, the barrier operation is typically optimized into a nop.
SEE ALSO
atomic(3), spinlock(3) Darwin May 26, 2004 Darwin
Related Man Pages
osatomicor32(3) - mojave
osatomicadd32barrier(3) - mojave
osatomicand32orig(3) - mojave
membar_producer(3) - netbsd
membar_sync(3) - netbsd
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