Reece Wilson
8ff81df129
[*] Optimize mutex lock out of RWLockImpl::TryLockWrite [*] Force all relevant members of RWLockImpl to be volatile just bc lol (afaik we cant justify it yet; however, i want to minimalize the risk of future issues in this type)
85 lines
1.8 KiB
C++
85 lines
1.8 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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namespace Aurora::Threading::Primitives
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{
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struct RWLockImpl;
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template<bool isread>
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struct RWLockAccessView : IWaitable
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{
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RWLockAccessView(RWLockImpl &impl) : parent_(impl)
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{
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}
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bool Lock(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(Lock(0));
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}
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void Unlock() override;
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private:
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RWLockImpl &parent_;
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};
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struct RWLockImpl : IRWLock
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{
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RWLockImpl();
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~RWLockImpl();
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bool LockRead(AuUInt64 timeout);
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bool LockWrite(AuUInt64 timeout);
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bool TryLockRead();
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bool TryLockWrite();
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void UnlockRead();
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void UnlockWrite();
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bool UpgradeReadToWrite(AuUInt64 timeout) override;
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bool DowngradeWriteToRead() override;
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IWaitable *AsReadable() override;
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IWaitable *AsWritable() override;
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bool Init();
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private:
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//bool reentrantWriteLock_ {true};
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AuUInt reentrantWriteLockHandle_ {};
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RWLockAccessView<true> read_;
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RWLockAccessView<false> write_;
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ConditionMutexImpl mutex_;
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ConditionVariableImpl condition_;
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volatile AuInt32 state_ {};
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AuInt32 writersPending_ {};
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bool bElevaterPending_ {};
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};
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}
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