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https://git.eden-emu.dev/eden-emu/eden
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b1daffad19
inline justified because it's like 4-5 assembly instructions max Signed-off-by: lizzie <lizzie@eden-emu.dev> Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3287 Reviewed-by: DraVee <dravee@eden-emu.dev> Reviewed-by: CamilleLaVey <camillelavey99@gmail.com> Co-authored-by: lizzie <lizzie@eden-emu.dev> Co-committed-by: lizzie <lizzie@eden-emu.dev>
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#ifdef _MSC_VER
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#include <intrin.h>
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#elif defined(ARCHITECTURE_x86_64)
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#include <xmmintrin.h>
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#endif
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#include <atomic>
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namespace Common {
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/// @brief A lock similar to mutex that forces a thread to spin wait instead calling the
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/// supervisor. Should be used on short sequences of code.
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struct SpinLock {
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SpinLock() noexcept = default;
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SpinLock(const SpinLock&) noexcept = delete;
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SpinLock& operator=(const SpinLock&) noexcept = delete;
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SpinLock(SpinLock&&) noexcept = delete;
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SpinLock& operator=(SpinLock&&) noexcept = delete;
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inline void lock() noexcept {
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while (lck.test_and_set(std::memory_order_acquire)) {
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#if defined(ARCHITECTURE_x86_64)
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_mm_pause();
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#elif defined(ARCHITECTURE_arm64) && defined(_MSC_VER)
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__yield();
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#elif defined(ARCHITECTURE_arm64)
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asm("yield");
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#endif
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}
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}
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inline void unlock() noexcept {
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lck.clear(std::memory_order_release);
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}
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[[nodiscard]] inline bool try_lock() noexcept {
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return !lck.test_and_set(std::memory_order_acquire);
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}
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std::atomic_flag lck = ATOMIC_FLAG_INIT;
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};
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} // namespace Common
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