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NetBSD 6.1.5 - man page for membar_ops (netbsd section 3)

MEMBAR_OPS(3)			   BSD Library Functions Manual 		    MEMBAR_OPS(3)

NAME
     membar_ops, membar_enter, membar_exit, membar_producer, membar_consumer, membar_sync -- mem-
     ory access barrier operations

SYNOPSIS
     #include <sys/atomic.h>

     void
     membar_enter(void);

     void
     membar_exit(void);

     void
     membar_producer(void);

     void
     membar_consumer(void);

     void
     membar_sync(void);

DESCRIPTION
     The membar_ops family of functions provide memory access barrier operations necessary for
     synchronization in multiprocessor execution environments that have relaxed load and store
     order.

     membar_enter()
	  Any store preceding membar_enter() will reach global visibility before all loads and
	  stores following it.

	  membar_enter() is typically used in code that implements locking primitives to ensure
	  that a lock protects its data.

     membar_exit()
	  All loads and stores preceding membar_exit() will reach global visibility before any
	  store that follows it.

	  membar_exit() is typically used in code that implements locking primitives to ensure
	  that a lock protects its data.

     membar_producer()
	  All stores preceding the memory barrier will reach global visibility before any stores
	  after the memory barrier reach global visibility.

     membar_consumer()
	  All loads preceding the memory barrier will complete before any loads after the memory
	  barrier complete.

     membar_sync()
	  All loads and stores preceding the memory barrier will complete and reach global visi-
	  bility before any loads and stores after the memory barrier complete and reach global
	  visibility.

SEE ALSO
     atomic_ops(3)

HISTORY
     The membar_ops functions first appeared in NetBSD 5.0.

BSD					February 11, 2007				      BSD


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