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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of jom.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "iocompletionport.h"
namespace NMakeFile {
IoCompletionPort *IoCompletionPort::m_instance = 0;
IoCompletionPort::IoCompletionPort()
: hPort(INVALID_HANDLE_VALUE)
{
setObjectName(QLatin1String("I/O completion port thread"));
HANDLE hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, NULL, 0);
if (!hIOCP) {
qWarning("CreateIoCompletionPort failed with error code %d.\n", GetLastError());
return;
}
hPort = hIOCP;
}
IoCompletionPort::~IoCompletionPort()
{
PostQueuedCompletionStatus(hPort, 0, NULL, NULL);
QThread::wait();
CloseHandle(hPort);
}
IoCompletionPort *IoCompletionPort::instance()
{
if (!m_instance)
m_instance = new IoCompletionPort;
return m_instance;
}
void IoCompletionPort::destroyInstance()
{
delete m_instance;
m_instance = 0;
}
void IoCompletionPort::registerObserver(IoCompletionPortObserver *observer, HANDLE hFile)
{
HANDLE hIOCP = CreateIoCompletionPort(hFile, hPort, reinterpret_cast<ULONG_PTR>(observer), 0);
if (!hIOCP) {
qWarning("Can't associate file handle with I/O completion port. Error code %d.\n", GetLastError());
return;
}
mutex.lock();
observers.insert(observer);
mutex.unlock();
if (!QThread::isRunning())
QThread::start();
}
void IoCompletionPort::unregisterObserver(IoCompletionPortObserver *observer)
{
mutex.lock();
observers.remove(observer);
mutex.unlock();
}
void IoCompletionPort::run()
{
DWORD dwBytesRead;
ULONG_PTR pulCompletionKey;
OVERLAPPED *overlapped;
for (;;) {
BOOL success = GetQueuedCompletionStatus(hPort,
&dwBytesRead,
&pulCompletionKey,
&overlapped,
INFINITE);
DWORD errorCode = success ? ERROR_SUCCESS : GetLastError();
if (!success && !overlapped) {
printf("GetQueuedCompletionStatus failed with error code %d.\n", errorCode);
return;
}
if (success && !(dwBytesRead || pulCompletionKey || overlapped)) {
// We've posted null values via PostQueuedCompletionStatus to end this thread.
return;
}
IoCompletionPortObserver *observer = reinterpret_cast<IoCompletionPortObserver *>(pulCompletionKey);
mutex.lock();
if (observers.contains(observer))
observer->completionPortNotified(dwBytesRead, errorCode);
mutex.unlock();
}
}
} // namespace NMakeFile
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