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Copy pathworkerPool.cpp
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executable file
·206 lines (147 loc) · 5.14 KB
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/*
*****************************************************************************
* Copyright (C) 2012 - 2014 Institute of Information Technology,
* Alpen-Adria-Universität Klagenfurt
*
* Created on: May 20, 2014
* Authors: Benjamin Rainer <benjamin.rainer@itec.aau.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <stdint.h>
#if (defined WIN32 || defined WIN64)
#include <Windows.h>
#endif
#include "workerPool.h"
workerPool::workerPool(void)
{
// check how many CPUs / cores we have
#if (defined WIN32 || defined WIN64)
SYSTEM_INFO sysInfo;
GetSystemInfo(&sysInfo);
// create our worker pool
workers = sysInfo.dwNumberOfProcessors;
#else
#if (defined ANDROID)
workers = ANDROID_MAX_THREADS;
#else
workers = sysconf(_SC_NPROCESSORS_ONLN);
#endif
#endif
initThreads();
}
workerPool::workerPool(unsigned int workers)
{
this->workers = workers;
initThreads();
}
void workerPool::initThreads()
{
threads = (thread**) new thread[workers]();
threadIDs = new threadId[workers]();
wParam = (workerParam*) calloc(workers,sizeof(workerParam));
threadsReady = event_barrier_create(workers);
for(uint32_t i=0;i<workers;i++)
{
// create mutex for every thread, events, ...
wParam[i].threadData = NULL;
wParam[i].tEvent = event_create();
event_init(wParam[i].tEvent);
wParam[i].threadID = i;
wParam[i].threadMutex = mutex_create(false);
wParam[i].threadFunc = NULL;
wParam[i].running = true;
threads[i] = thread_create(&worker, &wParam[i]);
wParam[i].wThread = threads[i];
wParam[i].workerFinished = threadsReady;
wParam[i].workers = workers;
}
poolMutex = mutex_create(false);
}
threadFuncReturnType workerPool::worker(threadFuncParamType params)
{
workerParam *wParam = (workerParam*) params;
while(wParam->running)
{
event_wait(wParam->tEvent);
event_reset(wParam->tEvent);
mutex_lock(wParam->threadMutex);
// call our function
if(wParam->threadFunc != NULL) wParam->threadFunc(wParam->threadData,wParam);
mutex_unlock(wParam->threadMutex);
if(wParam->synchronized) event_barrier_sync(wParam->workerFinished);
};
return (threadFuncReturnType)0;
}
int workerPool::attachAndWait(void *threadFunc,void *params)
{
if(threadFunc == NULL) return -1;
mutex_lock(poolMutex);
for(unsigned int i=0;i<workers;i++)
{
mutex_lock(wParam[i].threadMutex); // lock thread
wParam[i].threadData = params;
wParam[i].synchronized = true;
wParam[i].threadFunc = (ThreadFunction)threadFunc;
event_signal(wParam[i].tEvent); // tell him that there is work
mutex_unlock(wParam[i].threadMutex); // unlock thread
}
// wait on all threads, create a barrier for this ... because in the pthread library conditions do not have a memory
event_barrier_wait(threadsReady);
event_barrier_reset(threadsReady);
mutex_unlock(poolMutex);
return 0;
}
int workerPool::attach(void *threadFunc, void *params)
{
if(threadFunc == NULL) return -1;
mutex_lock(poolMutex);
for(unsigned int i=0;i<workers;i++)
{
mutex_lock(wParam[i].threadMutex); // lock thread
wParam[i].threadData = params;
wParam[i].synchronized = false;
wParam[i].threadFunc = (ThreadFunction)threadFunc;
event_signal(wParam[i].tEvent); // tell him that there is work
mutex_unlock(wParam[i].threadMutex); // unlock thread
}
mutex_unlock(poolMutex);
return 0;
}
workerPool::~workerPool(void)
{
mutex_destroy(poolMutex);
for(unsigned int i=0;i<workers;i++)
{
wParam[i].running = false;
mutex_lock(wParam[i].threadMutex); // lock thread
wParam[i].threadData = NULL;
wParam[i].synchronized = false;
wParam[i].threadFunc = NULL;
event_signal(wParam[i].tEvent); // tell him that there is work
mutex_unlock(wParam[i].threadMutex); // unlock thread
thread_join(wParam[i].wThread); // join the thread and wait until it is done
thread_destroy(wParam[i].wThread);
event_destroy(wParam[i].tEvent);
mutex_destroy(wParam[i].threadMutex);
}
free(wParam);
event_barrier_destroy(threadsReady);
delete []threads;
delete []threadIDs;
}