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/* Copyright (c) <2003-2011> <Julio Jerez, Newton Game Dynamics>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/
#include "dgStdafx.h"
#include "dgTypes.h"
#include "dgThreads.h"
inline void dgSpinUnlock(dgInt32 *spin) {
*spin = 0;
}
dgThreads::dgThreads() {
m_numberOfCPUCores = 0;
m_numOfThreads = 0;
m_exit = false;
m_topIndex = 0;
m_bottomIndex = 0;
m_workInProgress = 0;
m_globalSpinLock = 0;
m_workToDoSpinLock = 0;
m_getPerformanceCount = NULL;
for (dgInt32 i = 0; i < DG_MAXIMUN_THREADS; i++) {
m_localData[i].m_ticks = 0;
m_localData[i].m_threadIndex = i;
m_localData[i].m_manager = this;
}
}
dgThreads::~dgThreads() {
}
dgInt32 dgThreads::GetThreadCount() const {
return (m_numOfThreads == 0) ? 1 : m_numOfThreads;
}
void dgThreads::ClearTimers() {
}
void dgThreads::SetPerfomanceCounter(OnGetPerformanceCountCallback callback) {
m_getPerformanceCount = callback;
}
dgUnsigned32 dgThreads::GetPerfomanceTicks(dgUnsigned32 threadIndex) const {
if (dgInt32(threadIndex) <= m_numOfThreads) {
return dgUnsigned32(m_localData[threadIndex].m_ticks);
} else {
return 0;
}
}
void dgThreads::CreateThreaded(dgInt32 threads) {
}
void dgThreads::DestroydgThreads() {
}
//Queues up another to work
dgInt32 dgThreads::SubmitJob(dgWorkerThread *const job) {
NEWTON_ASSERT(job->m_threadIndex != -1);
job->ThreadExecute();
return 1;
}
void *dgThreads::ThreadExecute(void *param) {
dgLocadData &data = *(dgLocadData *) param;
data.m_manager->DoWork(data.m_threadIndex);
return 0;
}
dgInt32 dgThreads::GetWork(dgWorkerThread **job) {
dgWorkerThread *cWorker = m_queue[m_bottomIndex];
*job = cWorker;
return 1;
}
void dgThreads::DoWork(dgInt32 mythreadIndex) {
// dgWorkerThread *job;
// job->ThreadExecute();
}
void dgThreads::SynchronizationBarrier() {
}
void dgThreads::CalculateChunkSizes(dgInt32 elements,
dgInt32 *const chunkSizes) const {
dgInt32 step;
dgInt32 fraction;
if (m_numOfThreads) {
step = elements / m_numOfThreads;
fraction = elements - step * m_numOfThreads;
for (dgInt32 i = 0; i < m_numOfThreads; i++) {
chunkSizes[i] = step + (fraction > 0);
fraction--;
}
} else {
chunkSizes[0] = elements;
}
}
void dgThreads::dgGetLock() const {
NEWTON_ASSERT(sizeof(dgInt32) == sizeof(long));
//spinLock( &m_globalSpinLock );
// linux and mac may need to yeald time
// while(! __sync_bool_compare_and_swap(&m_globalSpinLock, 0, 1) ) {
// ThreadYield();
// }
}
void dgThreads::dgReleaseLock() const {
dgSpinUnlock(&m_globalSpinLock);
}
void dgThreads::dgGetIndirectLock(dgInt32 *lockVar) {
NEWTON_ASSERT(sizeof(dgInt32) == sizeof(long));
}
void dgThreads::dgReleaseIndirectLock(dgInt32 *lockVar) {
NEWTON_ASSERT(sizeof(dgInt32) == sizeof(long));
dgSpinUnlock(lockVar);
}
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