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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qsystemsemaphore.h"
#include "qsystemsemaphore_p.h"
#include "qcoreapplication.h"
#include <qdebug.h>
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
#if QT_CONFIG(systemsemaphore)
QSystemSemaphorePrivate::QSystemSemaphorePrivate() :
semaphore(0), error(QSystemSemaphore::NoError)
{
}
void QSystemSemaphorePrivate::setErrorString(const QString &function)
{
BOOL windowsError = GetLastError();
if (windowsError == 0)
return;
switch (windowsError) {
case ERROR_NO_SYSTEM_RESOURCES:
case ERROR_NOT_ENOUGH_MEMORY:
error = QSystemSemaphore::OutOfResources;
errorString = QCoreApplication::translate("QSystemSemaphore", "%1: out of resources").arg(function);
break;
case ERROR_ACCESS_DENIED:
error = QSystemSemaphore::PermissionDenied;
errorString = QCoreApplication::translate("QSystemSemaphore", "%1: permission denied").arg(function);
break;
default:
errorString = QCoreApplication::translate("QSystemSemaphore", "%1: unknown error %2").arg(function).arg(windowsError);
error = QSystemSemaphore::UnknownError;
#if defined QSYSTEMSEMAPHORE_DEBUG
qDebug() << errorString << "key" << key;
#endif
}
}
HANDLE QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode)
{
// don't allow making handles on empty keys
if (key.isEmpty())
return 0;
// Create it if it doesn't already exists.
if (semaphore == 0) {
semaphore = CreateSemaphore(0, initialValue, MAXLONG,
reinterpret_cast<const wchar_t*>(fileName.utf16()));
if (semaphore == NULL)
setErrorString("QSystemSemaphore::handle"_L1);
}
return semaphore;
}
void QSystemSemaphorePrivate::cleanHandle()
{
if (semaphore && !CloseHandle(semaphore)) {
#if defined QSYSTEMSEMAPHORE_DEBUG
qDebug("QSystemSemaphorePrivate::CloseHandle: sem failed");
#endif
}
semaphore = 0;
}
bool QSystemSemaphorePrivate::modifySemaphore(int count)
{
if (0 == handle())
return false;
if (count > 0) {
if (0 == ReleaseSemaphore(semaphore, count, 0)) {
setErrorString("QSystemSemaphore::modifySemaphore"_L1);
#if defined QSYSTEMSEMAPHORE_DEBUG
qDebug("QSystemSemaphore::modifySemaphore ReleaseSemaphore failed");
#endif
return false;
}
} else {
if (WAIT_OBJECT_0 != WaitForSingleObjectEx(semaphore, INFINITE, FALSE)) {
setErrorString("QSystemSemaphore::modifySemaphore"_L1);
#if defined QSYSTEMSEMAPHORE_DEBUG
qDebug("QSystemSemaphore::modifySemaphore WaitForSingleObject failed");
#endif
return false;
}
}
clearError();
return true;
}
#endif // QT_CONFIG(systemsemaphore)
QT_END_NAMESPACE
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