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