323ce02f23
This change has been done to make it easier for OpenSceneGraph users to check out the svn via https without any conflicts introduced with a http externals.
150 lines
3.9 KiB
C++
150 lines
3.9 KiB
C++
/* -*-c++-*- OpenThreads library, Copyright (C) 2002 - 2007 The Open Thread Group
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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//
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// Win32Barrier.c++ - C++ Barrier class built on top of POSIX threads.
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// ~~~~~~~~~~~~~~~~~~
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//
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#include <OpenThreads/Barrier>
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#include <OpenThreads/Thread>
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#include <OpenThreads/ScopedLock>
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#include "Win32BarrierPrivateData.h"
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using namespace OpenThreads;
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// so compiler can place it somewhere
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Win32BarrierPrivateData::~Win32BarrierPrivateData()
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{
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};
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//----------------------------------------------------------------------------
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//
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// Description: Constructor
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//
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// Use: public.
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//
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Barrier::Barrier(int numThreads) {
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Win32BarrierPrivateData *pd = new Win32BarrierPrivateData();
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pd->cnt = 0;
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pd->phase = 0;
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pd->maxcnt = numThreads;
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_valid = true;
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_prvData = static_cast<void *>(pd);
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}
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//----------------------------------------------------------------------------
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//
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// Description: Destructor
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//
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// Use: public.
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//
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Barrier::~Barrier() {
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Win32BarrierPrivateData *pd =
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static_cast<Win32BarrierPrivateData*>(_prvData);
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delete pd;
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}
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//----------------------------------------------------------------------------
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//
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// Description: Reset the barrier to its original state
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//
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// Use: public.
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//
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void Barrier::reset() {
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Win32BarrierPrivateData *pd =
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static_cast<Win32BarrierPrivateData*>(_prvData);
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pd->cnt = 0;
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pd->phase = 0;
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}
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//----------------------------------------------------------------------------
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//
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// Description: Block until numThreads threads have entered the barrier.
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//
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// Use: public.
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//
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void Barrier::block(unsigned int numThreads) {
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Win32BarrierPrivateData *pd =
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static_cast<Win32BarrierPrivateData*>(_prvData);
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if(numThreads != 0) pd->maxcnt = numThreads;
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int my_phase;
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ScopedLock<Mutex> lock(pd->lock);
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if( _valid )
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{
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my_phase = pd->phase;
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++pd->cnt;
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if (pd->cnt == pd->maxcnt) { // I am the last one
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pd->cnt = 0; // reset for next use
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pd->phase = 1 - my_phase; // toggle phase
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pd->cond.broadcast();
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}else{
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while (pd->phase == my_phase ) {
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pd->cond.wait(&pd->lock);
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}
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}
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}
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}
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void Barrier::invalidate()
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{
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Win32BarrierPrivateData *pd =
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static_cast<Win32BarrierPrivateData*>(_prvData);
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pd->lock.lock();
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_valid = false;
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pd->lock.unlock();
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release();
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}
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//----------------------------------------------------------------------------
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//
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// Description: Release the barrier, now.
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//
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// Use: public.
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//
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void Barrier::release() {
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Win32BarrierPrivateData *pd =
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static_cast<Win32BarrierPrivateData*>(_prvData);
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int my_phase;
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ScopedLock<Mutex> lock(pd->lock);
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my_phase = pd->phase;
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pd->cnt = 0; // reset for next use
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pd->phase = 1 - my_phase; // toggle phase
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pd->cond.broadcast();
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}
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//----------------------------------------------------------------------------
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//
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// Description: Return the number of threads currently blocked in the barrier
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//
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// Use: public
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//
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int Barrier::numThreadsCurrentlyBlocked() {
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Win32BarrierPrivateData *pd =
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static_cast<Win32BarrierPrivateData*>(_prvData);
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int numBlocked = -1;
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ScopedLock<Mutex> lock(pd->lock);
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numBlocked = pd->cnt;
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return numBlocked;
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}
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