144 lines
3.5 KiB
C++
144 lines
3.5 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: AuConditionMutex.Win32.cpp
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Date: 2021-6-12
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Author: Reece
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***/
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#include <Source/RuntimeInternal.hpp>
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#include "AuConditionMutex.Generic.hpp"
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#include "SMTYield.hpp"
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#include "AuProcAddresses.NT.hpp"
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#if !defined(_AURUNTIME_GENERICCM)
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namespace Aurora::Threading::Primitives
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{
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Win32ConditionMutex::Win32ConditionMutex()
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{
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#if !defined(AURORA_FORCE_SRW_LOCKS)
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if (gKeyedEventHandle == INVALID_HANDLE_VALUE)
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{
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if (!pNtCreateKeyedEvent)
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{
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InitNTAddresses();
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}
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pNtCreateKeyedEvent(&gKeyedEventHandle, -1, NULL, 0);
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}
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#else
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::InitializeSRWLock(&this->lock_);
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#endif
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}
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Win32ConditionMutex::~Win32ConditionMutex()
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{
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}
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bool Win32ConditionMutex::TryLock()
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{
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#if defined(AURORA_FORCE_SRW_LOCKS)
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return ::TryAcquireSRWLockExclusive(&this->lock_);
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#else
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return DoTryIf([=]()
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{
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return !AuAtomicTestAndSet(&this->lock_.uWaitCount, 0);
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});
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#endif
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}
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void Win32ConditionMutex::Lock()
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{
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#if defined(AURORA_FORCE_SRW_LOCKS)
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::AcquireSRWLockExclusive(&this->lock_);
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#else
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while (!TryLock())
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{
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auto &uValueRef = this->lock_.uWaitCount;
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auto uValue = uValueRef | 1;
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if (AuAtomicCompareExchange(&uValueRef, uValue + kFutexBitWait, uValue) == uValue)
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{
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pNtWaitForKeyedEvent(gKeyedEventHandle, (void *)&uValueRef, 0, NULL);
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AuAtomicSub(&uValueRef, kFutexBitWake);
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}
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}
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#endif
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}
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void Win32ConditionMutex::Unlock()
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{
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#if defined(AURORA_FORCE_SRW_LOCKS)
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::ReleaseSRWLockExclusive(&this->lock_);
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#else
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auto &uValueRef = this->lock_.uWaitCount;
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// Mirrors: ./AuMutex.NT.cpp
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// keep this codeblock in parity
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// defer to the comments in that source file
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#if defined(AURORA_ARCH_X86) || defined(AURORA_ARCH_X64)
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*(AuUInt8 *)&uValueRef = 0;
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#else
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InterlockedAndRelease((volatile LONG *)&uValueRef, ~0xFF);
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#endif
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while (true)
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{
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auto uOld = uValueRef;
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auto uValue = uOld;
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if (uValue & 1)
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{
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return;
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}
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if (uValue < kFutexBitWait)
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{
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return;
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}
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if (uValue & kFutexBitWake)
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{
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if (AuAtomicCompareExchange(&uValueRef, uValue, uValue) == uValue)
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{
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return;
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}
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else
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{
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SMPPause();
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continue;
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}
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}
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if (AuAtomicCompareExchange(&uValueRef, uValue - kFutexBitWait + kFutexBitWake, uValue) == uValue)
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{
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pNtReleaseKeyedEvent(gKeyedEventHandle, (void *)&uValueRef, 0, NULL);
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return;
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}
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SMPPause();
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}
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#endif
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}
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AuUInt Win32ConditionMutex::GetOSHandle()
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{
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return reinterpret_cast<AuUInt>(&this->lock_);
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}
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AUKN_SYM IConditionMutex *ConditionMutexNew()
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{
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return _new Win32ConditionMutex();
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}
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AUKN_SYM void ConditionMutexRelease(IConditionMutex *pMutex)
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{
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AuSafeDelete<Win32ConditionMutex *>(pMutex);
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}
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AUROXTL_INTERFACE_SOO_SRC_EX(AURORA_SYMBOL_EXPORT, ConditionMutex, Win32ConditionMutex)
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}
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#endif |