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https://github.com/TrinityCore/TrinityCore.git
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110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
/*
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* Copyright (c) 2005, Eric Crahen
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "zthread/PriorityInheritanceMutex.h"
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#include "MutexImpl.h"
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#include "ThreadOps.h"
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namespace ZThread {
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class InheritPriorityBehavior : public NullBehavior {
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ThreadImpl* owner;
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Priority p;
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protected:
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// Temporarily raise the effective priority of the owner
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inline void waiterArrived(ThreadImpl* impl) {
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Priority q = impl->getPriority();
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if((int)q > (int)p) {
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ThreadOps::setPriority(impl, p);
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p = q;
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}
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}
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// Note the owners priority
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inline void ownerAcquired(ThreadImpl* impl) {
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p = impl->getPriority();
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owner = impl;
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}
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// Restore its original priority
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inline void ownerReleased(ThreadImpl* impl) {
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if(p > owner->getPriority())
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ThreadOps::setPriority(impl, impl->getPriority());
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}
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};
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class PriorityInheritanceMutexImpl :
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public MutexImpl<priority_list, InheritPriorityBehavior> { };
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PriorityInheritanceMutex::PriorityInheritanceMutex() {
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_impl = new PriorityInheritanceMutexImpl();
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}
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PriorityInheritanceMutex::~PriorityInheritanceMutex() {
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if(_impl != 0)
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delete _impl;
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}
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// P
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void PriorityInheritanceMutex::acquire() {
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_impl->acquire();
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}
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// P
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bool PriorityInheritanceMutex::tryAcquire(unsigned long ms) {
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return _impl->tryAcquire(ms);
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}
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// V
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void PriorityInheritanceMutex::release() {
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_impl->release();
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}
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} // namespace ZThread
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