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66 lines
1.3 KiB
C++
66 lines
1.3 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#pragma once
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#include <mutex>
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#include <memory>
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#include <condition_variable>
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namespace base {
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// Helper for macOS < 11.0 and GCC < 11 that don't have wait/notify.
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#if defined __cpp_lib_atomic_wait && !defined Q_OS_MAC
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using std::atomic;
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using std::atomic_notify_all;
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#else // __cpp_lib_atomic_wait
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template <typename Type>
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class atomic final {
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public:
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atomic(Type value) : _value(value) {
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}
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atomic &operator=(Type value) {
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_value = value;
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return *this;
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}
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[[nodiscard]] Type load() const {
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return _value.load();
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}
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void wait(Type whileEquals) {
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if (_value == whileEquals) {
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std::unique_lock<std::mutex> lock(_mutex);
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while (_value == whileEquals) {
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_condition.wait(lock);
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}
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}
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}
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friend inline bool operator==(const atomic &a, Type b) {
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return (a._value == b);
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}
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friend void atomic_notify_all(atomic *value) {
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std::unique_lock<std::mutex> lock(value->_mutex);
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value->_condition.notify_all();
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}
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private:
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std::atomic<Type> _value;
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std::mutex _mutex;
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std::condition_variable _condition;
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};
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#endif // __cpp_lib_atomic_wait
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} // namespace base
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