SMP Barriers

This group contains the SMP barrier implementation. More...

Files
file	cpukit/include/rtems/score/smpbarrier.h
	This header file provides the interfaces of the SMP Barriers.
file	cpukit/score/src/smpbarrierwait.c
	This source file contains the implementation of _SMP_barrier_Wait().

Data Structures
struct	SMP_barrier_Control
	SMP barrier control. More...
struct	SMP_barrier_State
	SMP barrier per-thread state. More...

Macros
#define	SMP_BARRIER_CONTROL_INITIALIZER   { ATOMIC_INITIALIZER_UINT( 0U ), ATOMIC_INITIALIZER_UINT( 0U ) }
	SMP barrier control initializer for static initialization.
#define	SMP_BARRIER_STATE_INITIALIZER   { 0U }
	SMP barrier per-thread state initializer for static initialization.

Functions
bool	_SMP_barrier_Wait (SMP_barrier_Control *control, SMP_barrier_State *state, unsigned int count)
	Waits on the SMP barrier until count threads rendezvoused.

Detailed Description

This group contains the SMP barrier implementation.

The SMP barrier provides barrier synchronization for SMP systems at the lowest level.

The SMP barrier is implemented as a sense barrier, see also Herlihy and Shavit, "The Art of Multiprocessor Programming", 17.3 Sense-Reversing Barrier.

Function Documentation

_SMP_barrier_Wait()

bool _SMP_barrier_Wait	(	SMP_barrier_Control *	control,
		SMP_barrier_State *	state,
		unsigned int	count )

Waits on the SMP barrier until count threads rendezvoused.

Parameters

[in,out]	control	The SMP barrier control.
[in,out]	state	The SMP barrier per-thread state.
	count	The thread count bound to rendezvous.

Return values

true	This processor performed the barrier release.
false	This processor did not performe the barrier release.