186 lines
4.3 KiB
C++
186 lines
4.3 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: AuSemaphore.NT.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 "AuSemaphore.Generic.hpp"
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#include "AuSemaphore.NT.hpp"
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#include "SMTYield.hpp"
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#if !defined(_AURUNTIME_GENERIC_SEMAPHORE)
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namespace Aurora::Threading::Primitives
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{
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SemaphoreImpl::SemaphoreImpl(long iIntialValue) :
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var(AuUnsafeRaiiToShared(&this->mutex))
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{
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this->value_ = iIntialValue;
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}
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SemaphoreImpl::~SemaphoreImpl()
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{
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}
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bool SemaphoreImpl::HasOSHandle(AuMach &mach)
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{
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return false;
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}
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bool SemaphoreImpl::HasLockImplementation()
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{
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return true;
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}
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bool SemaphoreImpl::TryLock()
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{
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return DoTryIf([=]()
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{
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auto old = this->value_;
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return (old != 0 && AuAtomicCompareExchange(&this->value_, old - 1, old) == old);
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});
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}
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bool SemaphoreImpl::LockMS(AuUInt64 uTimeout)
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{
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return LockNS(AuMSToNS<AuUInt64>(uTimeout));
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}
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bool SemaphoreImpl::LockNS(AuUInt64 uTimeout)
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{
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if (this->TryLock())
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{
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return true;
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}
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AuUInt64 uStart = AuTime::SteadyClockNS();
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AuUInt64 uEnd = uStart + uTimeout;
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if (pWaitOnAddress)
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{
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auto old = this->value_;
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//!tryLock (with old in a scope we can access)
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while (!((old != 0) &&
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(AuAtomicCompareExchange(&this->value_, old - 1, old) == old)))
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{
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AuUInt32 dwTimeoutMs = INFINITE;
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if (uTimeout != 0)
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{
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uStart = Time::SteadyClockNS();
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if (uStart >= uEnd)
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{
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return false;
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}
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dwTimeoutMs = AuNSToMS<AuInt64>(uEnd - uStart);
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}
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old = 0;
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if (dwTimeoutMs == 0)
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{
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SMPPause();
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AuThreading::ContextYield();
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continue;
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}
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else
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{
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(void)pWaitOnAddress(&this->value_, &old, sizeof(this->value_), dwTimeoutMs);
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}
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old = this->value_;
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}
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return true;
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}
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else
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{
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this->mutex.Lock();
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while (!TryLock())
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{
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if (uTimeout != 0)
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{
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uStart = Time::SteadyClockNS();
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if (uStart >= uEnd)
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{
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this->mutex.Unlock();
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return false;
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}
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var.WaitForSignalNS(uEnd - uStart);
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}
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else
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{
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var.WaitForSignalNS(0);
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}
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}
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this->mutex.Unlock();
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}
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return true;
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}
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void SemaphoreImpl::Lock()
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{
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auto status = LockNS(0);
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SysAssert(status, "Couldn't lock semaphore");
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}
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void SemaphoreImpl::Unlock(long count)
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{
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if (!pWaitOnAddress)
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{
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this->mutex.Lock();
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AuAtomicAdd<AuInt32>(&this->value_, count);
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if (count == 1)
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{
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this->var.Signal();
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}
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else
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{
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for (AU_ITERATE_N(i, count))
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{
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(void)i;
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this->var.Signal();
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}
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}
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this->mutex.Unlock();
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}
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else
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{
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AuAtomicAdd<AuInt32>(&this->value_, count);
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if (count == 1)
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{
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pWakeByAddressSingle(&this->value_);
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}
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else
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{
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pWakeByAddressAll(&this->value_);
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}
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}
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}
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void SemaphoreImpl::Unlock()
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{
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return Unlock(1);
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}
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AUKN_SYM ISemaphore *SemaphoreNew(int iInitialCount)
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{
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return _new SemaphoreImpl(iInitialCount);
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}
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AUKN_SYM void SemaphoreRelease(ISemaphore *pSemaphore)
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{
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AuSafeDelete<SemaphoreImpl *>(pSemaphore);
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}
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AUROXTL_INTERFACE_SOO_SRC_EX(AURORA_SYMBOL_EXPORT, Semaphore, SemaphoreImpl)
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}
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#endif |