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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.
*
*/
#ifndef __ZTPRIORITYSEMAPHORE_H__
#define __ZTPRIORITYSEMAPHORE_H__
#include "zthread/Lockable.h"
#include "zthread/NonCopyable.h"
namespace ZThread {
class PrioritySemaphoreImpl;
/**
* @class PrioritySemaphore
* @author Eric Crahen <http://www.code-foo.com>
* @date <2003-07-16T15:36:07-0400>
* @version 2.2.1
*
* A PrioritySemaphore operates in the same way as a Semaphore. Its an owner-less
* Lockable object that is sensitive to priority.
*
* <b>Scheduling</b>
*
* Threads blocked on a PrioritySemaphore are resumed in priority order, highest
* priority first.
*
* <b>Error Checking</b>
*
* An attempt to increase a PrioritySemaphore beyond its maximum value will result in
* an InvalidOp_Exception.
*
* @see Semaphore
*/
class ZTHREAD_API PrioritySemaphore : public Lockable, private NonCopyable {
PrioritySemaphoreImpl* _impl;
public:
/**
* @see Semaphore::Semaphore(int count, unsigned int maxCount)
*/
PrioritySemaphore(int count = 1, unsigned int maxCount = 1);
/**
* @see Semaphore::~Semaphore()
*/
virtual ~PrioritySemaphore();
/**
* @see Semaphore::wait()
*/
void wait();
/**
* @see Semaphore::tryWait(unsigned long)
*/
bool tryWait(unsigned long);
/**
* @see Semaphore::post()
*/
void post();
/**
* @see Semaphore::count()
*/
virtual int count();
/**
* @see Semaphore::tryAcquire(unsigned long timeout)
*/
virtual bool tryAcquire(unsigned long timeout);
/**
* @see Semaphore::acquire()
*/
virtual void acquire();
/**
* @see Semaphore::release()
*/
virtual void release();
};
} // namespace ZThread
#endif // __ZTPRIORITYSEMAPHORE_H__
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