Gabriele Cosmo
103 lines
3.9 KiB
C++
103 lines
3.9 KiB
C++
// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4MTBarrier class implementation
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//
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// Author: A.Dotti (SLAC), 10 February 2016
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// Revision: J.Madsen (NERSC), 09 February 2018
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// --------------------------------------------------------------------
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#include "G4MTBarrier.hh"
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#include "G4AutoLock.hh"
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// --------------------------------------------------------------------
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G4MTBarrier::G4MTBarrier(unsigned int numThreads)
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: m_numActiveThreads(numThreads)
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{}
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// --------------------------------------------------------------------
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void G4MTBarrier::ThisWorkerReady()
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{
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// Step-1: Worker acquires lock on shared resource (the counter)
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G4AutoLock lock(&m_mutex);
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// Step-2: Worker increases counter
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++m_counter;
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// Step-3: Worker broadcasts that the counter has changed
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G4CONDITIONBROADCAST(&m_counterChanged);
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// Step-4: Worker waits on condition to continue
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G4CONDITIONWAIT(&m_continue, &lock);
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}
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// --------------------------------------------------------------------
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void G4MTBarrier::Wait()
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{
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while(true)
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{
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// Step-2: Acquires lock on shared resource (the counter)
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G4AutoLock lock(&m_mutex);
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// If the counter equals active threads, all threads are ready, exit the
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// loop
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if(m_counter == m_numActiveThreads)
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{
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break;
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}
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// Step-3: Not all workers are ready, wait for the number to change
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// before repeating the check
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G4CONDITIONWAIT(&m_counterChanged, &lock);
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}
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}
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// --------------------------------------------------------------------
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void G4MTBarrier::ReleaseBarrier()
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{
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// Step-4: re-aquire lock and re-set shared resource for future re-use
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G4AutoLock lock(&m_mutex);
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m_counter = 0;
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G4CONDITIONBROADCAST(&m_continue);
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}
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// --------------------------------------------------------------------
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void G4MTBarrier::WaitForReadyWorkers()
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{
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// Step-1: Master enters a loop to wait all workers to be ready
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Wait();
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// Done, all workers are ready, broadcast a continue signal
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ReleaseBarrier();
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}
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// --------------------------------------------------------------------
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void G4MTBarrier::ResetCounter()
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{
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G4AutoLock l(&m_mutex);
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m_counter = 0;
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}
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// --------------------------------------------------------------------
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unsigned int G4MTBarrier::GetCounter()
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{
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G4AutoLock l(&m_mutex);
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const unsigned int result = m_counter;
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return result;
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}
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