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-rw-r--r--src/common/polyfill_thread.h323
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diff --git a/src/common/polyfill_thread.h b/src/common/polyfill_thread.h
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+// SPDX-FileCopyrightText: 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+//
+// TODO: remove this file when jthread is supported by all compilation targets
+//
+
+#pragma once
+
+#include <version>
+
+#ifdef __cpp_lib_jthread
+
+#include <stop_token>
+#include <thread>
+
+namespace Common {
+
+template <typename Condvar, typename Lock, typename Pred>
+void CondvarWait(Condvar& cv, Lock& lock, std::stop_token token, Pred&& pred) {
+ cv.wait(lock, token, std::move(pred));
+}
+
+} // namespace Common
+
+#else
+
+#include <atomic>
+#include <functional>
+#include <list>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <thread>
+#include <type_traits>
+
+namespace std {
+namespace polyfill {
+
+using stop_state_callbacks = list<function<void()>>;
+
+class stop_state {
+public:
+ stop_state() = default;
+ ~stop_state() = default;
+
+ bool request_stop() {
+ stop_state_callbacks callbacks;
+
+ {
+ scoped_lock lk{m_lock};
+
+ if (m_stop_requested.load()) {
+ // Already set, nothing to do
+ return false;
+ }
+
+ // Set as requested
+ m_stop_requested = true;
+
+ // Copy callback list
+ callbacks = m_callbacks;
+ }
+
+ for (auto callback : callbacks) {
+ callback();
+ }
+
+ return true;
+ }
+
+ bool stop_requested() const {
+ return m_stop_requested.load();
+ }
+
+ stop_state_callbacks::const_iterator insert_callback(function<void()> f) {
+ stop_state_callbacks::const_iterator ret{};
+ bool should_run{};
+
+ {
+ scoped_lock lk{m_lock};
+ should_run = m_stop_requested.load();
+ m_callbacks.push_front(f);
+ ret = m_callbacks.begin();
+ }
+
+ if (should_run) {
+ f();
+ }
+
+ return ret;
+ }
+
+ void remove_callback(stop_state_callbacks::const_iterator it) {
+ scoped_lock lk{m_lock};
+ m_callbacks.erase(it);
+ }
+
+private:
+ mutex m_lock;
+ atomic<bool> m_stop_requested;
+ stop_state_callbacks m_callbacks;
+};
+
+} // namespace polyfill
+
+class stop_token;
+class stop_source;
+struct nostopstate_t {
+ explicit nostopstate_t() = default;
+};
+inline constexpr nostopstate_t nostopstate{};
+
+template <class Callback>
+class stop_callback;
+
+class stop_token {
+public:
+ stop_token() noexcept = default;
+
+ stop_token(const stop_token&) noexcept = default;
+ stop_token(stop_token&&) noexcept = default;
+ stop_token& operator=(const stop_token&) noexcept = default;
+ stop_token& operator=(stop_token&&) noexcept = default;
+ ~stop_token() = default;
+
+ void swap(stop_token& other) noexcept {
+ m_stop_state.swap(other.m_stop_state);
+ }
+
+ [[nodiscard]] bool stop_requested() const noexcept {
+ return m_stop_state && m_stop_state->stop_requested();
+ }
+ [[nodiscard]] bool stop_possible() const noexcept {
+ return m_stop_state != nullptr;
+ }
+
+private:
+ friend class stop_source;
+ template <typename Callback>
+ friend class stop_callback;
+ stop_token(shared_ptr<polyfill::stop_state> stop_state) : m_stop_state(move(stop_state)) {}
+
+private:
+ shared_ptr<polyfill::stop_state> m_stop_state;
+};
+
+class stop_source {
+public:
+ stop_source() : m_stop_state(make_shared<polyfill::stop_state>()) {}
+ explicit stop_source(nostopstate_t) noexcept {}
+
+ stop_source(const stop_source&) noexcept = default;
+ stop_source(stop_source&&) noexcept = default;
+ stop_source& operator=(const stop_source&) noexcept = default;
+ stop_source& operator=(stop_source&&) noexcept = default;
+ ~stop_source() = default;
+ void swap(stop_source& other) noexcept {
+ m_stop_state.swap(other.m_stop_state);
+ }
+
+ [[nodiscard]] stop_token get_token() const noexcept {
+ return stop_token(m_stop_state);
+ }
+ [[nodiscard]] bool stop_possible() const noexcept {
+ return m_stop_state != nullptr;
+ }
+ [[nodiscard]] bool stop_requested() const noexcept {
+ return m_stop_state && m_stop_state->stop_requested();
+ }
+ bool request_stop() noexcept {
+ return m_stop_state && m_stop_state->request_stop();
+ }
+
+private:
+ friend class jthread;
+ explicit stop_source(shared_ptr<polyfill::stop_state> stop_state)
+ : m_stop_state(move(stop_state)) {}
+
+private:
+ shared_ptr<polyfill::stop_state> m_stop_state;
+};
+
+template <typename Callback>
+class stop_callback {
+ static_assert(is_nothrow_destructible_v<Callback>);
+ static_assert(is_invocable_v<Callback>);
+
+public:
+ using callback_type = Callback;
+
+ template <typename C>
+ requires constructible_from<Callback, C>
+ explicit stop_callback(const stop_token& st,
+ C&& cb) noexcept(is_nothrow_constructible_v<Callback, C>)
+ : m_stop_state(st.m_stop_state) {
+ if (m_stop_state) {
+ m_callback = m_stop_state->insert_callback(move(cb));
+ }
+ }
+ template <typename C>
+ requires constructible_from<Callback, C>
+ explicit stop_callback(stop_token&& st,
+ C&& cb) noexcept(is_nothrow_constructible_v<Callback, C>)
+ : m_stop_state(move(st.m_stop_state)) {
+ if (m_stop_state) {
+ m_callback = m_stop_state->insert_callback(move(cb));
+ }
+ }
+ ~stop_callback() {
+ if (m_stop_state && m_callback) {
+ m_stop_state->remove_callback(*m_callback);
+ }
+ }
+
+ stop_callback(const stop_callback&) = delete;
+ stop_callback(stop_callback&&) = delete;
+ stop_callback& operator=(const stop_callback&) = delete;
+ stop_callback& operator=(stop_callback&&) = delete;
+
+private:
+ shared_ptr<polyfill::stop_state> m_stop_state;
+ optional<polyfill::stop_state_callbacks::const_iterator> m_callback;
+};
+
+template <typename Callback>
+stop_callback(stop_token, Callback) -> stop_callback<Callback>;
+
+class jthread {
+public:
+ using id = thread::id;
+ using native_handle_type = thread::native_handle_type;
+
+ jthread() noexcept = default;
+
+ template <typename F, typename... Args,
+ typename = enable_if_t<!is_same_v<remove_cvref_t<F>, jthread>>>
+ explicit jthread(F&& f, Args&&... args)
+ : m_stop_state(make_shared<polyfill::stop_state>()),
+ m_thread(make_thread(move(f), move(args)...)) {}
+
+ ~jthread() {
+ if (joinable()) {
+ request_stop();
+ join();
+ }
+ }
+
+ jthread(const jthread&) = delete;
+ jthread(jthread&&) noexcept = default;
+ jthread& operator=(const jthread&) = delete;
+
+ jthread& operator=(jthread&& other) noexcept {
+ m_thread.swap(other.m_thread);
+ m_stop_state.swap(other.m_stop_state);
+ return *this;
+ }
+
+ void swap(jthread& other) noexcept {
+ m_thread.swap(other.m_thread);
+ m_stop_state.swap(other.m_stop_state);
+ }
+ [[nodiscard]] bool joinable() const noexcept {
+ return m_thread.joinable();
+ }
+ void join() {
+ m_thread.join();
+ }
+ void detach() {
+ m_thread.detach();
+ m_stop_state.reset();
+ }
+
+ [[nodiscard]] id get_id() const noexcept {
+ return m_thread.get_id();
+ }
+ [[nodiscard]] native_handle_type native_handle() {
+ return m_thread.native_handle();
+ }
+ [[nodiscard]] stop_source get_stop_source() noexcept {
+ return stop_source(m_stop_state);
+ }
+ [[nodiscard]] stop_token get_stop_token() const noexcept {
+ return stop_source(m_stop_state).get_token();
+ }
+ bool request_stop() noexcept {
+ return get_stop_source().request_stop();
+ }
+ [[nodiscard]] static unsigned int hardware_concurrency() noexcept {
+ return thread::hardware_concurrency();
+ }
+
+private:
+ template <typename F, typename... Args>
+ thread make_thread(F&& f, Args&&... args) {
+ if constexpr (is_invocable_v<decay_t<F>, stop_token, decay_t<Args>...>) {
+ return thread(move(f), get_stop_token(), move(args)...);
+ } else {
+ return thread(move(f), move(args)...);
+ }
+ }
+
+ shared_ptr<polyfill::stop_state> m_stop_state;
+ thread m_thread;
+};
+
+} // namespace std
+
+namespace Common {
+
+template <typename Condvar, typename Lock, typename Pred>
+void CondvarWait(Condvar& cv, Lock& lock, std::stop_token token, Pred pred) {
+ if (token.stop_requested()) {
+ return;
+ }
+
+ std::stop_callback callback(token, [&] { cv.notify_all(); });
+ cv.wait(lock, [&] { return pred() || token.stop_requested(); });
+}
+
+} // namespace Common
+
+#endif