Revision control
++ // Copyright (C) 2025 Intel Corporation.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++
++ #ifndef QATOMICWAIT_P_H
++ #define QATOMICWAIT_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 "qbasicatomic.h"
++ #include <private/qglobal_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace QtPrivate {
++ enum class WakeMode { One = 1, All = -1 };
++
++ #ifdef QATOMICWAIT_USE_FALLBACK
++ # define Q_ATOMICWAIT_EXPORT /* being linked into the unit test */
++ #else
++ # define Q_ATOMICWAIT_EXPORT Q_CORE_EXPORT
++ #endif
++
++ Q_ATOMICWAIT_EXPORT void _q_atomicWait(const void *address, const void *old, qsizetype size) noexcept;
++ Q_ATOMICWAIT_EXPORT void _q_atomicWake(void *address, WakeMode) noexcept;
++
++ #undef Q_ATOMICWAIT_EXPORT
++ }
++
++ namespace QtFallbackAtomicWait {
++ // C++20- & C23-like API
++ template <typename T> std::enable_if_t<std::has_unique_object_representations_v<T>>
++ atomic_wait_explicit(const std::atomic<T> *atomic, T old, std::memory_order mo) noexcept
++ {
++ Q_ASSERT(mo == std::memory_order_relaxed || mo == std::memory_order_acquire
++ || mo == std::memory_order_seq_cst);
++ QtPrivate::_q_atomicWait(atomic, &old, sizeof(T));
++ // TSAN does not support atomic_thread_fence and GCC complains (QTBUG-134415)
++ QT_WARNING_PUSH
++ #if defined(Q_CC_GNU_ONLY) && Q_CC_GNU >= 1100
++ QT_WARNING_DISABLE_GCC("-Wtsan")
++ #endif
++ std::atomic_thread_fence(mo);
++ QT_WARNING_POP
++ }
++
++ template <typename T> std::enable_if_t<std::has_unique_object_representations_v<T>>
++ atomic_wait(const std::atomic<T> *atomic, T old) noexcept
++ {
++ atomic_wait_explicit(atomic, old, std::memory_order_seq_cst);
++ }
++
++ template <typename T> std::enable_if_t<std::has_unique_object_representations_v<T>>
++ atomic_notify_one(std::atomic<T> *atomic)
++ {
++ QtPrivate::_q_atomicWake(atomic, QtPrivate::WakeMode::One);
++ }
++
++ template <typename T> std::enable_if_t<std::has_unique_object_representations_v<T>>
++ atomic_notify_all(std::atomic<T> *atomic)
++ {
++ QtPrivate::_q_atomicWake(atomic, QtPrivate::WakeMode::All);
++ }
++ } // namespace QtFallbackAtomicWait
++
++ namespace q20 {
++ #ifdef __cpp_lib_atomic_wait
++ using std::atomic_wait;
++ using std::atomic_wait_explicit;
++ using std::atomic_notify_all;
++ using std::atomic_notify_one;
++ #else
++ using QtFallbackAtomicWait::atomic_wait;
++ using QtFallbackAtomicWait::atomic_wait_explicit;
++ using QtFallbackAtomicWait::atomic_notify_all;
++ using QtFallbackAtomicWait::atomic_notify_one;
++ #endif
++ } // namespace QtNativeAtomicWait
++
++ QT_END_NAMESPACE
++
++ #endif // QATOMICWAIT_P_H