130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: AuRWLock.hpp
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Date: 2021-6-12
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Author: Reece
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***/
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#pragma once
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#include "AuConditionVariable.Generic.hpp"
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#include "AuConditionMutex.Generic.hpp"
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#include "ThreadCookie.hpp"
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namespace Aurora::Threading::Primitives
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{
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template<bool bIsWriteRecursionAllowed>
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struct RWLockImpl;
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template<bool bIsReadView, typename T>
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struct RWLockAccessView : IWaitable
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{
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#if defined(RWLOCK_VIEW_HAS_PARENT)
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RWLockAccessView(T &impl) :
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parent_(impl)
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{
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}
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#endif
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bool LockMS(AuUInt64 timeout) override;
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bool LockNS(AuUInt64 timeout) override;
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bool LockAbsMS(AuUInt64 timeout) override;
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bool LockAbsNS(AuUInt64 timeout) override;
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bool TryLock() override;
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bool HasOSHandle(AuMach &mach) override
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{
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return false;
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}
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bool HasLockImplementation() override
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{
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return true;
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}
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void Lock() override
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{
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SysAssert(LockNS(0));
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}
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void Unlock() override;
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private:
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#if defined(RWLOCK_VIEW_HAS_PARENT)
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T &parent_;
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#endif
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};
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template<bool bIsWriteRecursionAllowed>
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struct RWLockImpl final : IRWLock
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{
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RWLockImpl();
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~RWLockImpl();
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// i dont think i'll expose a high performance interface yet
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auline bool LockReadNSAbs(AuUInt64 timeout);// override;
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auline bool LockReadNS(AuUInt64 timeout);// override;
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auline bool LockWriteNS(AuUInt64 timeout);// override;
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auline bool LockWriteNSAbs(AuUInt64 timeout);// override;
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auline bool TryLockRead();// override;
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template<bool bCheckWrite>
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auline bool TryLockReadNoSpin();
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auline bool TryLockWriteScatterSwitch();// override;
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auline void UnlockRead();// override;
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auline void UnlockWrite();// override;
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auline void WriterWake();
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auline bool WriterSleep(AuUInt64 qwTimeoutNS);
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auline bool WriterTryLock();
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auline void FutexWriterWake();
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auline bool TryLockWriteMaybeSpin();// override;
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auline bool TryLockWriteNoSpin();// override;
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auline bool LockWriteNSAbsUnlocked(AuUInt64 qwTimeoutNS);// override;
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bool UpgradeReadToWrite(AuUInt64 timeout) override;
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bool DowngradeWriteToRead() override;
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auline bool UpgradeReadToWriteDoUpgrade();
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IWaitable *AsReadable() override;
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IWaitable *AsWritable() override;
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bool CheckSelfThreadIsWriter() override;
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auline ConditionVariableInternal &GetCondition();
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auline ConditionVariableInternal &GetConditionWriter();
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auline AuUInt32 *GetFutexCondition();
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auline AuUInt32 *GetFutexConditionWriter();
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auline void SignalOneReader();
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auline void SignalOneWriter();
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auline void SignalManyReader();
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auline void SignalManyWriter(int iBias = 0);
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auline AuUInt32 *GetReadSleepCounter();
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private:
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RWLockAccessView<true, RWLockImpl> read_;
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RWLockAccessView<false, RWLockImpl> write_;
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ConditionMutexInternal mutex_;
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#if defined(AURWLOCK_NO_SIZE_OPTIMIZED_CONDVAR)
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ConditionVariableInternal condition_;
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ConditionVariableInternal conditionWriter_;
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#else
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char conditionVariable_[kSizeOfDummyCondVar] {};
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char conditionVariableWriter_[kSizeOfDummyCondVar] {};
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#endif
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ThreadCookie_t reentrantWriteLockHandle_ {};
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AuAInt32 iState_ {};
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AuAInt32 dwWritersPending_ {};
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public:
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cstatic const AuUInt8 kOffsetOfRead = AuOffsetOf(&RWLockImpl::read_);
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cstatic const AuUInt8 kOffsetOfWrite = AuOffsetOf(&RWLockImpl::write_);
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};
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}
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