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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkBarrier.cxx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:33 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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DEF |
#ifndef __itkBarrier_cxx_ |
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DEF |
#define __itkBarrier_cxx_ |
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#include "itkBarrier.h" |
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#include "itkMacro.h" |
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#ifdef ITK_USE_SPROC |
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#include "itkMultiThreader.h" |
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#endif |
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namespace itk { |
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#ifdef ITK_USE_FETCHOP_BARRIERS |
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atomic_reservoir_t Barrier::m_Reservoir = 0; |
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bool Barrier::m_ReservoirInitialized = false; |
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int Barrier::m_MaxBarriers = 1024; |
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#endif |
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Barrier::Barrier() |
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{ |
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m_NumberExpected = 0; |
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#ifndef ITK_USE_SPROC |
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#ifndef ITK_USE_FETCHOP_BARRIERS |
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m_NumberArrived = 0; |
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m_ConditionVariable = ConditionVariable::New(); |
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#endif |
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#endif |
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} |
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Barrier::~Barrier() |
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{ |
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#if defined ITK_USE_FETCHOP_BARRIERS |
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if (m_Pvar !=0 && Barrier::m_Reservoir != 0 ) |
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{ |
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atomic_free_variable(Barrier::m_Reservoir, m_Pvar); |
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m_Pvar = 0; |
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} |
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if (Barrier::m_Reservoir != 0) |
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{ |
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atomic_free_reservoir(Barrier::m_Reservoir); |
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Barrier::m_Reservoir = 0; |
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} |
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#elif defined ITK_USE_SPROC |
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if (m_Barrier != 0) |
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{ |
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// Note: free_barrier should be called here |
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// but is buggy and causes a seg fault. jc 7/29/03 |
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// free_barrier( m_Barrier ); |
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} |
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#endif |
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} |
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void Barrier::Initialize( unsigned int n ) |
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{ |
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m_NumberExpected = n; |
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#if defined ITK_USE_FETCHOP_BARRIERS |
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// Create the reservoir. |
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if (Barrier::m_ReservoirInitialized == false) |
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{ |
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Barrier::m_Reservoir = atomic_alloc_reservoir(USE_DEFAULT_PM, m_MaxBarriers, 0); |
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if (Barrier::m_Reservoir != 0) |
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{ |
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Barrier::m_ReservoirInitialized = true; |
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} |
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else |
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{ |
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itkExceptionMacro( << "atomic_alloc_reservoir call failed!" ); |
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} |
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} |
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m_FetchopFlag = 0; |
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m_Pvar = atomic_alloc_variable(Barrier::m_Reservoir, 0); |
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storeop_store(m_Pvar, 0); |
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#elif defined ITK_USE_SPROC |
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if (MultiThreader::GetInitialized() == false) |
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{ |
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MultiThreader::Initialize(); |
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} |
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m_Barrier = new_barrier( MultiThreader::GetThreadArena() ); |
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#endif |
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} |
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void Barrier::Wait() |
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{ |
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#if defined ITK_USE_FETCHOP_BARRIERS |
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int gen = m_FetchopFlag; |
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atomic_var_t val = atomic_fetch_and_increment(m_Pvar); |
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if (val == m_NumberExpected - 1) |
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{ |
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storeop_store(m_Pvar, 0); |
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m_FetchopFlag++; |
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} |
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while (m_FetchopFlag == gen) |
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{ // spin |
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} |
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#elif defined ITK_USE_SPROC |
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barrier(m_Barrier, m_NumberExpected); |
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#else |
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m_Mutex.Lock(); |
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m_NumberArrived++; |
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if ( m_NumberArrived == m_NumberExpected ) |
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{ |
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// Clear all blocked threads |
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m_NumberArrived = 0; |
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m_ConditionVariable->Broadcast(); |
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} |
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else |
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{ |
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// Block this thread |
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m_ConditionVariable->Wait( &m_Mutex ); |
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} |
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m_Mutex.Unlock(); |
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#endif |
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} |
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}// end namespace itk |
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#endif |
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