diff options
Diffstat (limited to 'src/corelib/ipc/qsystemsemaphore_win.cpp')
-rw-r--r-- | src/corelib/ipc/qsystemsemaphore_win.cpp | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/corelib/ipc/qsystemsemaphore_win.cpp b/src/corelib/ipc/qsystemsemaphore_win.cpp new file mode 100644 index 0000000000..f42fecf71f --- /dev/null +++ b/src/corelib/ipc/qsystemsemaphore_win.cpp @@ -0,0 +1,98 @@ +// 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) + +void QSystemSemaphorePrivate::setWindowsErrorString(QLatin1StringView 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, qt_error_string(windowsError)); + error = QSystemSemaphore::UnknownError; +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug() << errorString << "key" << key; +#endif + } +} + +HANDLE QSystemSemaphoreWin32::handle(QSystemSemaphorePrivate *self, QSystemSemaphore::AccessMode) +{ + // don't allow making handles on empty keys + if (self->nativeKey.isEmpty()) + return 0; + + // Create it if it doesn't already exists. + if (semaphore == 0) { + semaphore = CreateSemaphore(0, self->initialValue, MAXLONG, + reinterpret_cast<const wchar_t*>(self->nativeKey.nativeKey().utf16())); + if (semaphore == NULL) + self->setWindowsErrorString("QSystemSemaphore::handle"_L1); + } + + return semaphore; +} + +void QSystemSemaphoreWin32::cleanHandle(QSystemSemaphorePrivate *) +{ + if (semaphore && !CloseHandle(semaphore)) { +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug("QSystemSemaphoreWin32::CloseHandle: sem failed"); +#endif + } + semaphore = 0; +} + +bool QSystemSemaphoreWin32::modifySemaphore(QSystemSemaphorePrivate *self, int count) +{ + if (handle(self, QSystemSemaphore::Open) == nullptr) + return false; + + if (count > 0) { + if (0 == ReleaseSemaphore(semaphore, count, 0)) { + self->setWindowsErrorString("QSystemSemaphore::modifySemaphore"_L1); +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug("QSystemSemaphore::modifySemaphore ReleaseSemaphore failed"); +#endif + return false; + } + } else { + if (WAIT_OBJECT_0 != WaitForSingleObjectEx(semaphore, INFINITE, FALSE)) { + self->setWindowsErrorString("QSystemSemaphore::modifySemaphore"_L1); +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug("QSystemSemaphore::modifySemaphore WaitForSingleObject failed"); +#endif + return false; + } + } + + self->clearError(); + return true; +} + +#endif // QT_CONFIG(systemsemaphore) + +QT_END_NAMESPACE |