gem5::WFBarrier Class Reference

WF barrier slots. More...

#include <compute_unit.hh>

Public Member Functions
	WFBarrier ()
int	numAtBarrier () const
int	numYetToReachBarrier () const
	Number of WFs that have not yet reached the barrier.
int	maxBarrierCnt () const
void	setMaxBarrierCnt (int max_barrier_cnt)
	Set the maximum barrier count (i.e., the number of WFs that are participating in the barrier).
void	incNumAtBarrier ()
	Mark that a WF has reached the barrier.
bool	allAtBarrier () const
	Have all WFs participating in this barrier reached the barrier? If so, then the barrier is satisfied and WFs may proceed past the barrier.
void	decMaxBarrierCnt ()
	Decrement the number of WFs that are participating in this barrier.
void	release ()
	Release this barrier resource so it can be used by other WGs.
void	reset ()
	Reset the barrier.

Static Public Attributes
static const int	InvalidID = -1

Private Attributes
int	_numAtBarrier
	The number of WFs in the WG that have reached the barrier.
int	_maxBarrierCnt
	The maximum number of WFs that can reach this barrier.

Detailed Description

WF barrier slots.

This represents the barrier resource for WF-level barriers (i.e., barriers to sync WFs within a WG).

Definition at line 91 of file compute_unit.hh.

Constructor & Destructor Documentation

WFBarrier()

gem5::WFBarrier::WFBarrier ( )

inline

Definition at line 94 of file compute_unit.hh.

Member Function Documentation

allAtBarrier()

bool gem5::WFBarrier::allAtBarrier ( ) const

inline

Have all WFs participating in this barrier reached the barrier? If so, then the barrier is satisfied and WFs may proceed past the barrier.

Definition at line 147 of file compute_unit.hh.

References _maxBarrierCnt, and _numAtBarrier.

decMaxBarrierCnt()

void gem5::WFBarrier::decMaxBarrierCnt ( )

inline

Decrement the number of WFs that are participating in this barrier.

This should be called when a WF exits.

Definition at line 157 of file compute_unit.hh.

References _maxBarrierCnt.

incNumAtBarrier()

void gem5::WFBarrier::incNumAtBarrier ( )

inline

Mark that a WF has reached the barrier.

Definition at line 135 of file compute_unit.hh.

References _maxBarrierCnt, and _numAtBarrier.

maxBarrierCnt()

int gem5::WFBarrier::maxBarrierCnt ( ) const

inline

Definition at line 116 of file compute_unit.hh.

References _maxBarrierCnt.

numAtBarrier()

int gem5::WFBarrier::numAtBarrier ( ) const

inline

Definition at line 101 of file compute_unit.hh.

References _numAtBarrier.

numYetToReachBarrier()

int gem5::WFBarrier::numYetToReachBarrier ( ) const

inline

Number of WFs that have not yet reached the barrier.

Definition at line 110 of file compute_unit.hh.

References _maxBarrierCnt, and _numAtBarrier.

release()

void gem5::WFBarrier::release ( )

inline

Release this barrier resource so it can be used by other WGs.

This is generally called when a WG has finished.

Definition at line 168 of file compute_unit.hh.

References _maxBarrierCnt, and _numAtBarrier.

reset()

void gem5::WFBarrier::reset ( )

inline

Reset the barrier.

This is used to reset the barrier, usually when a dynamic instance of a barrier has been satisfied.

Definition at line 179 of file compute_unit.hh.

References _numAtBarrier.

setMaxBarrierCnt()

void gem5::WFBarrier::setMaxBarrierCnt ( int max_barrier_cnt )

inline

Set the maximum barrier count (i.e., the number of WFs that are participating in the barrier).

Definition at line 126 of file compute_unit.hh.

References _maxBarrierCnt.

Member Data Documentation

_maxBarrierCnt

int gem5::WFBarrier::_maxBarrierCnt

private

The maximum number of WFs that can reach this barrier.

This is essentially the number of WFs in the WG, and a barrier is satisfied when the number of WFs that reach the barrier equal this value. If a WF exits early it must decrement this value so that it is no longer considered for this barrier.

Definition at line 199 of file compute_unit.hh.

Referenced by allAtBarrier(), decMaxBarrierCnt(), incNumAtBarrier(), maxBarrierCnt(), numYetToReachBarrier(), release(), and setMaxBarrierCnt().

_numAtBarrier

int gem5::WFBarrier::_numAtBarrier

private

The number of WFs in the WG that have reached the barrier.

Once the number of WFs that reach a barrier matches the number of WFs in the WG, the barrier is satisfied.

Definition at line 190 of file compute_unit.hh.

Referenced by allAtBarrier(), incNumAtBarrier(), numAtBarrier(), numYetToReachBarrier(), release(), and reset().

InvalidID

const int gem5::WFBarrier::InvalidID = -1

static

Definition at line 98 of file compute_unit.hh.

Referenced by gem5::Wavefront::barrierId(), gem5::ComputeUnit::barrierSlot(), gem5::ComputeUnit::dispWorkgroup(), gem5::VegaISA::Inst_SOPP__S_ENDPGM::execute(), gem5::Wavefront::hasBarrier(), gem5::Wavefront::releaseBarrier(), and gem5::ComputeUnit::startWavefront().

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The documentation for this class was generated from the following file:

• gpu-compute/compute_unit.hh