Blame qtools/qthread_win32.cpp

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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** contained in the either Technology Preview License Agreement or the
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** Beta Release License Agreement.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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****************************************************************************/
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#include "qthread.h"
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#include "qthread_p.h"
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/**************************************************************************
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 ** QThreadPrivate
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 *************************************************************************/
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QThreadPrivate::QThreadPrivate() :
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  running(FALSE), finished(FALSE), terminated(FALSE), stackSize(0)
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{
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  handle = NULL;
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  waiters = 0;
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}
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QThreadPrivate::~QThreadPrivate()
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{
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}
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unsigned int __stdcall QThreadPrivate::start(void *arg)
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{
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    QThread *thr = reinterpret_cast<QThread *>(arg);
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    thr->started();
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    thr->run();
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    finish(arg);
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    return 0;
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}
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void QThreadPrivate::finish(void *arg,bool lockAnyway)
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{
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    QThread *thr = reinterpret_cast<QThread *>(arg);
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    QThreadPrivate *d = thr->d;
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    if (lockAnyway) d->mutex.lock();
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    d->running = FALSE;
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    d->finished = TRUE;
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    if (d->terminated) thr->terminated();
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    d->terminated = FALSE;
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    thr->finished();
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    if (!d->waiters)
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    {
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      CloseHandle(d->handle);
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      d->handle = 0;
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    }
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    if (lockAnyway) d->mutex.unlock();
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}
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/**************************************************************************
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 ** QThread
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 *************************************************************************/
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void QThread::start()
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{
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    QMutexLocker locker(&d->mutex);
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    if (d->running) return;
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    d->running = TRUE;
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    d->finished = FALSE;
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    d->terminated = FALSE;
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    d->handle = CreateThread(NULL,d->stackSize,
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                    (LPTHREAD_START_ROUTINE)QThreadPrivate::start,this,0,NULL);
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    if (!d->handle) 
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    {
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        qWarning("QThread::start: Failed to create thread: errno=%d",errno);
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        d->running = FALSE;
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        d->finished = TRUE;
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        return;
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    }
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}
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void QThread::terminate()
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{
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    QMutexLocker locker(&d->mutex);
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    if (!d->running) return;
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    TerminateThread(d->handle, 0);
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    d->terminated = TRUE;
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    QThreadPrivate::finish(this);
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}
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void QThread::wait()
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{
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    QMutexLocker locker(&d->mutex);
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    if (d->finished || !d->running) return;
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    ++d->waiters;
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    locker.mutex()->unlock();
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    WaitForSingleObject(d->handle,INFINITE);
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    locker.mutex()->lock();
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    --d->waiters;
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    if (!d->finished) // thread was terminated by someone else
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    {
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      d->terminated = TRUE;
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      QThreadPrivate::finish(this);
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    }
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    if (d->finished && d->waiters)
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    {
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      CloseHandle(d->handle);
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      d->handle = 0;
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    }
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}
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int QThread::idealThreadCount()
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{
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    SYSTEM_INFO sysinfo;
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    GetSystemInfo(&sysinfo);
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    return sysinfo.dwNumberOfProcessors;
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}
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