From dfe10bc85196d1e7812b6cb775767cf1e072c20f Mon Sep 17 00:00:00 2001
From: lizzie <lizzie@eden-emu.dev>
Date: Wed, 1 Oct 2025 06:59:35 +0200
Subject: [common] use libc++ provided jthread instead of in-house one (which
 deadlocks on FBSD 14) (#351)

Needs test on our CI targets to see I didn't miss anything. Worried about android.

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/351
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>
---
 src/common/polyfill_thread.h | 351 +------------------------------------------
 1 file changed, 3 insertions(+), 348 deletions(-)

(limited to 'src/common/polyfill_thread.h')

diff --git a/src/common/polyfill_thread.h b/src/common/polyfill_thread.h
index 12e59a8939..0d3c963d25 100644
--- a/src/common/polyfill_thread.h
+++ b/src/common/polyfill_thread.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -7,23 +10,13 @@
 
 #pragma once
 
-#include <version>
-
-#ifdef __cpp_lib_jthread
-
 #include <chrono>
 #include <condition_variable>
-#include <stop_token>
 #include <thread>
 #include <utility>
 
 namespace Common {
 
-template <typename Condvar, typename Lock, typename Pred>
-void CondvarWait(Condvar& cv, std::unique_lock<Lock>& lk, std::stop_token token, Pred&& pred) {
-    cv.wait(lk, token, std::forward<Pred>(pred));
-}
-
 template <typename Rep, typename Period>
 bool StoppableTimedWait(std::stop_token token, const std::chrono::duration<Rep, Period>& rel_time) {
     std::condition_variable_any cv;
@@ -35,341 +28,3 @@ bool StoppableTimedWait(std::stop_token token, const std::chrono::duration<Rep,
 }
 
 } // namespace Common
-
-#else
-
-#include <atomic>
-#include <chrono>
-#include <condition_variable>
-#include <functional>
-#include <map>
-#include <memory>
-#include <mutex>
-#include <optional>
-#include <thread>
-#include <type_traits>
-#include <utility>
-
-namespace std {
-namespace polyfill {
-
-using stop_state_callback = size_t;
-
-class stop_state {
-public:
-    stop_state() = default;
-    ~stop_state() = default;
-
-    bool request_stop() {
-        unique_lock lk{m_lock};
-
-        if (m_stop_requested) {
-            // Already set, nothing to do.
-            return false;
-        }
-
-        // Mark stop requested.
-        m_stop_requested = true;
-
-        while (!m_callbacks.empty()) {
-            // Get an iterator to the first element.
-            const auto it = m_callbacks.begin();
-
-            // Move the callback function out of the map.
-            function<void()> f;
-            swap(it->second, f);
-
-            // Erase the now-empty map element.
-            m_callbacks.erase(it);
-
-            // Run the callback.
-            if (f) {
-                f();
-            }
-        }
-
-        return true;
-    }
-
-    bool stop_requested() const {
-        unique_lock lk{m_lock};
-        return m_stop_requested;
-    }
-
-    stop_state_callback insert_callback(function<void()> f) {
-        unique_lock lk{m_lock};
-
-        if (m_stop_requested) {
-            // Stop already requested. Don't insert anything,
-            // just run the callback synchronously.
-            if (f) {
-                f();
-            }
-            return 0;
-        }
-
-        // Insert the callback.
-        stop_state_callback ret = ++m_next_callback;
-        m_callbacks.emplace(ret, std::move(f));
-        return ret;
-    }
-
-    void remove_callback(stop_state_callback cb) {
-        unique_lock lk{m_lock};
-        m_callbacks.erase(cb);
-    }
-
-private:
-    mutable recursive_mutex m_lock;
-    map<stop_state_callback, function<void()>> m_callbacks;
-    stop_state_callback m_next_callback{0};
-    bool m_stop_requested{false};
-};
-
-} // 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(std::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(std::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(std::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(std::move(st.m_stop_state)) {
-        if (m_stop_state) {
-            m_callback = m_stop_state->insert_callback(std::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;
-    polyfill::stop_state_callback 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(std::forward<F>(f), std::forward<Args>(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(std::forward<F>(f), get_stop_token(), std::forward<Args>(args)...);
-        } else {
-            return thread(std::forward<F>(f), std::forward<Args>(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, std::unique_lock<Lock>& lk, std::stop_token token, Pred pred) {
-    if (token.stop_requested()) {
-        return;
-    }
-
-    std::stop_callback callback(token, [&] {
-        { std::scoped_lock lk2{*lk.mutex()}; }
-        cv.notify_all();
-    });
-
-    cv.wait(lk, [&] { return pred() || token.stop_requested(); });
-}
-
-template <typename Rep, typename Period>
-bool StoppableTimedWait(std::stop_token token, const std::chrono::duration<Rep, Period>& rel_time) {
-    if (token.stop_requested()) {
-        return false;
-    }
-
-    bool stop_requested = false;
-    std::condition_variable cv;
-    std::mutex m;
-
-    std::stop_callback cb(token, [&] {
-        // Wake up the waiting thread.
-        {
-            std::scoped_lock lk{m};
-            stop_requested = true;
-        }
-        cv.notify_one();
-    });
-
-    // Perform the timed wait.
-    std::unique_lock lk{m};
-    return !cv.wait_for(lk, rel_time, [&] { return stop_requested; });
-}
-
-} // namespace Common
-
-#endif
-- 
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