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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 Pow-erPC, PowerPC,
erPC, by creating a barrier. All loads and stores executed in sequential program order before the bar-rier barrier
rier 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 synchro-nization synchronization
nization protocols as an alternative to the spinlock or queue/dequeue operations. Note that this bar-rier barrier
rier 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
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