77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: SpinLock.cpp
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Date: 2021-6-12
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Author: Reece
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***/
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#include <RuntimeInternal.hpp>
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#include "SpinLock.hpp"
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namespace Aurora::Threading::Primitives
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{
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static void YieldCpu(long &count)
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{
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int loops = (1 << count);
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while (loops > 0)
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{
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#if (defined(AURORA_ARCH_X64) || defined(AURORA_ARCH_X86))
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_mm_pause();
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#endif
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loops -= 1;
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}
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}
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SpinLock::SpinLock()
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{
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value_ = 0;
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}
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bool SpinLock::HasOSHandle(AuMach &mach)
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{
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return false;
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}
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bool SpinLock::TryLock()
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{
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#if defined(_AU_HAS_ATOMIC_INTRINS)
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return _interlockedbittestandset(&value_, 0) == 0;
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#else
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return value_.fetch_or(1);
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#endif
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}
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bool SpinLock::HasLockImplementation()
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{
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return true;
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}
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void SpinLock::Lock()
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{
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auto status = Lock(0);
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SysAssert(status, "Couldn't lock Mutex object");
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}
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bool SpinLock::Lock(AuUInt64 timeout)
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{
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#if defined(_AU_HAS_ATOMIC_INTRINS)
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while (_interlockedbittestandset(&value_, 0))
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#else
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while (value_.fetch_or(1))
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#endif
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{
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long count = 0;
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while (value_)
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{
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YieldCpu(count);
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}
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}
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return true;
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}
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void SpinLock::Unlock()
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{
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value_ = 0;
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}
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} |