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/*
* copyright (c) 2006 Boudewijn Rempt
*
* This program is free software; you can distribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 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 "kis_thread_pool.h"
#include <tdeglobal.h>
#include <tdeconfig.h>
#include <kdebug.h>
KisThreadPool * KisThreadPool::m_singleton = 0;
KisThreadPool::KisThreadPool()
{
Q_ASSERT(KisThreadPool::m_singleton == 0);
KisThreadPool::m_singleton = this;
TDEConfig * cfg = TDEGlobal::config();
cfg->setGroup("");
m_maxThreads = cfg->readNumEntry("maxthreads", 10);
m_numberOfRunningThreads = 0;
m_numberOfQueuedThreads = 0;
m_wait = 200;
start();
}
KisThreadPool::~KisThreadPool()
{
m_poolMutex.lock();
m_canceled = true;
m_runningThreads.setAutoDelete(true);
m_threads.setAutoDelete(true);
m_oldThreads.setAutoDelete(true);
KisThread * t;
for ( t = m_threads.first(); t; t = m_threads.next()) {
if (t) {
t->cancel();
t->wait();
m_threads.remove(t);
}
}
for ( t = m_runningThreads.first(); t; t = m_runningThreads.next()) {
if (t) {
t->cancel();
t->wait();
m_runningThreads.remove(t);
}
}
for ( t = m_oldThreads.first(); t; t = m_oldThreads.next()) {
if (t) {
t->cancel();
t->wait();
m_runningThreads.remove(t);
}
}
KisThreadPool::m_singleton = 0;
m_poolMutex.unlock();
}
KisThreadPool * KisThreadPool::instance()
{
if(KisThreadPool::m_singleton == 0)
{
KisThreadPool::m_singleton = new KisThreadPool();
}
else {
if (KisThreadPool::m_singleton->finished()) {
delete KisThreadPool::m_singleton;
KisThreadPool::m_singleton = 0;
KisThreadPool::m_singleton = new KisThreadPool();
}
}
return KisThreadPool::m_singleton;
}
void KisThreadPool::enqueue(KisThread * thread)
{
m_poolMutex.lock();
m_threads.append(thread);
m_numberOfQueuedThreads++;
m_poolMutex.unlock();
m_wait = 200;
}
void KisThreadPool::dequeue(KisThread * thread)
{
KisThread * t = 0;
m_poolMutex.lock();
int i = m_threads.findRef(thread);
if (i >= 0) {
t = m_threads.take(i);
m_numberOfQueuedThreads--;
} else {
i = m_runningThreads.findRef(thread);
if (i >= 0) {
t = m_runningThreads.take(i);
m_numberOfRunningThreads--;
}
else {
i = m_oldThreads.findRef(thread);
if (i >= 0) {
t = m_oldThreads.take(i);
}
}
}
m_poolMutex.unlock();
if (t) {
t->cancel();
t->wait();
delete t;
}
}
void KisThreadPool::run()
{
int sleeps = 10;
while(!m_canceled) {
if (m_numberOfQueuedThreads > 0 && m_numberOfRunningThreads < m_maxThreads) {
KisThread * thread = 0;
m_poolMutex.lock();
if (m_threads.count() > 0) {
thread = m_threads.take();
m_numberOfQueuedThreads--;
}
if (thread) {
thread->start();
m_runningThreads.append(thread);
m_numberOfRunningThreads++;
}
m_poolMutex.unlock();
}
else {
msleep(m_wait);
m_poolMutex.lock();
for ( KisThread * t = m_runningThreads.first(); t; t = m_runningThreads.next()) {
if (t) {
if (t->finished()) {
m_runningThreads.remove(t);
m_numberOfRunningThreads--;
m_oldThreads.append(t);
}
}
}
m_poolMutex.unlock();
m_poolMutex.lock();
if (m_numberOfQueuedThreads == 0 && m_numberOfRunningThreads == 0) {
sleeps--;
if (sleeps == 0) {
m_poolMutex.unlock();
return;
}
m_poolMutex.unlock();
}
m_poolMutex.unlock();
}
}
}
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