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Common: Implement a basic SpinLock class
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3 changed files with 68 additions and 0 deletions
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@ -143,6 +143,8 @@ add_library(common STATIC
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scm_rev.cpp
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scm_rev.h
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scope_exit.h
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spin_lock.cpp
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spin_lock.h
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string_util.cpp
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string_util.h
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swap.h
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46
src/common/spin_lock.cpp
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46
src/common/spin_lock.cpp
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@ -0,0 +1,46 @@
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/spin_lock.h"
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#if _MSC_VER
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#include <intrin.h>
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#if _M_AMD64
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#define __x86_64__ 1
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#endif
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#if _M_ARM64
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#define __aarch64__ 1
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#endif
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#else
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#if __x86_64__
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#include <xmmintrin.h>
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#endif
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#endif
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namespace {
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void thread_pause() {
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#if __x86_64__
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_mm_pause();
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#elif __aarch64__ && _MSC_VER
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__yield();
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#elif __aarch64__
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asm("yield");
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#endif
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}
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} // namespace
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namespace Common {
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void SpinLock::lock() {
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while (lck.test_and_set(std::memory_order_acquire))
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thread_pause();
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}
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void SpinLock::unlock() {
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lck.clear(std::memory_order_release);
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}
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} // namespace Common
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src/common/spin_lock.h
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20
src/common/spin_lock.h
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <atomic>
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namespace Common {
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class SpinLock {
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public:
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void lock();
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void unlock();
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private:
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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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