diff options
Diffstat (limited to 'src/corelib/ipc/qsystemsemaphore_p.h')
-rw-r--r-- | src/corelib/ipc/qsystemsemaphore_p.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/corelib/ipc/qsystemsemaphore_p.h b/src/corelib/ipc/qsystemsemaphore_p.h new file mode 100644 index 0000000000..788c4fb784 --- /dev/null +++ b/src/corelib/ipc/qsystemsemaphore_p.h @@ -0,0 +1,152 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// Copyright (C) 2022 Intel Corporation. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#ifndef QSYSTEMSEMAPHORE_P_H +#define QSYSTEMSEMAPHORE_P_H + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#include "qsystemsemaphore.h" + +#if QT_CONFIG(systemsemaphore) + +#include "qcoreapplication.h" +#include "qtipccommon_p.h" +#include "private/qtcore-config_p.h" + +#include <sys/types.h> +#if QT_CONFIG(posix_sem) +# include <semaphore.h> +#endif +#ifndef SEM_FAILED +# define SEM_FAILED nullptr +struct sem_t; +#endif +#if QT_CONFIG(sysv_sem) +# include <sys/sem.h> +#endif + +QT_BEGIN_NAMESPACE + +class QSystemSemaphorePrivate; + +struct QSystemSemaphorePosix +{ + static constexpr bool Enabled = QT_CONFIG(posix_sem); + static bool supports(QNativeIpcKey::Type type) + { return type == QNativeIpcKey::Type::PosixRealtime; } + static bool runtimeSupportCheck(); + + bool handle(QSystemSemaphorePrivate *self, QSystemSemaphore::AccessMode mode); + void cleanHandle(QSystemSemaphorePrivate *self); + bool modifySemaphore(QSystemSemaphorePrivate *self, int count); + + sem_t *semaphore = SEM_FAILED; + bool createdSemaphore = false; +}; + +struct QSystemSemaphoreSystemV +{ + static constexpr bool Enabled = QT_CONFIG(sysv_sem); + static bool supports(QNativeIpcKey::Type type) + { return quint16(type) <= 0xff; } + static bool runtimeSupportCheck(); + +#if QT_CONFIG(sysv_sem) + key_t handle(QSystemSemaphorePrivate *self, QSystemSemaphore::AccessMode mode); + void cleanHandle(QSystemSemaphorePrivate *self); + bool modifySemaphore(QSystemSemaphorePrivate *self, int count); + + QByteArray nativeKeyFile; + key_t unix_key = -1; + int semaphore = -1; + bool createdFile = false; + bool createdSemaphore = false; +#endif +}; + +struct QSystemSemaphoreWin32 +{ +#ifdef Q_OS_WIN32 + static constexpr bool Enabled = true; +#else + static constexpr bool Enabled = false; +#endif + static bool supports(QNativeIpcKey::Type type) + { return type == QNativeIpcKey::Type::Windows; } + static bool runtimeSupportCheck() { return Enabled; } + + // we can declare the members without the #if + Qt::HANDLE handle(QSystemSemaphorePrivate *self, QSystemSemaphore::AccessMode mode); + void cleanHandle(QSystemSemaphorePrivate *self); + bool modifySemaphore(QSystemSemaphorePrivate *self, int count); + + Qt::HANDLE semaphore = nullptr; +}; + +class QSystemSemaphorePrivate +{ +public: + QSystemSemaphorePrivate(QNativeIpcKey::Type type) : nativeKey(type) + { constructBackend(); } + ~QSystemSemaphorePrivate() { destructBackend(); } + + void setWindowsErrorString(QLatin1StringView function); // Windows only + void setUnixErrorString(QLatin1StringView function); + inline void setError(QSystemSemaphore::SystemSemaphoreError e, const QString &message) + { error = e; errorString = message; } + inline void clearError() + { setError(QSystemSemaphore::NoError, QString()); } + + QNativeIpcKey nativeKey; + QString errorString; + int initialValue; + QSystemSemaphore::SystemSemaphoreError error = QSystemSemaphore::NoError; + + union Backend { + Backend() {} + ~Backend() {} + QSystemSemaphorePosix posix; + QSystemSemaphoreSystemV sysv; + QSystemSemaphoreWin32 win32; + }; + QtIpcCommon::IpcStorageVariant<&Backend::posix, &Backend::sysv, &Backend::win32> backend; + + void constructBackend(); + void destructBackend(); + + template <typename Lambda> auto visit(const Lambda &lambda) + { + return backend.visit(nativeKey.type(), lambda); + } + + void handle(QSystemSemaphore::AccessMode mode) + { + visit([&](auto p) { p->handle(this, mode); }); + } + void cleanHandle() + { + visit([&](auto p) { p->cleanHandle(this); }); + } + bool modifySemaphore(int count) + { + return visit([&](auto p) { return p->modifySemaphore(this, count); }); + } +}; + +QT_END_NAMESPACE + +#endif // QT_CONFIG(systemsemaphore) + +#endif // QSYSTEMSEMAPHORE_P_H + |