synchronizedobject.h

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//
// SynchronizedObject.h
//
// $Id: //poco/Main/Foundation/include/Foundation/SynchronizedObject.h#5 $
//
// Definition of the SynchronizedObject class.
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Foundation_SynchronizedObject_INCLUDED
#define Foundation_SynchronizedObject_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif
#ifndef Foundation_Mutex_INCLUDED
#include "Foundation/Mutex.h"
#endif
#ifndef Foundation_Event_INCLUDED
#include "Foundation/Event.h"
#endif


Foundation_BEGIN


class Foundation_API SynchronizedObject
	/// This class aggregates a Mutex and an Event
	/// and can act as a base class for all objects
	/// requiring synchronization in a multithreaded
	/// scenario.
{
public:
	typedef Foundation::ScopedLock<SynchronizedObject> ScopedLock;
	
	SynchronizedObject();
		/// Creates the object.
		
	virtual ~SynchronizedObject();
		/// Destroys the object.

	void lock() const;
		/// Locks the object. Blocks if the object
		/// is locked by another thread.

	bool tryLock() const;
		/// Tries to lock the object. Returns false immediately
		/// if the object is already locked by another thread
		/// Returns true if the object was successfully locked.
	
	void unlock() const;
		/// Unlocks the object so that it can be locked by
		/// other threads.
		
	void notify() const;
		/// Signals the object. 
		/// Exactly only one thread waiting for the object 
		/// can resume execution.

	void wait() const;
		/// Waits for the object to become signalled.

	void wait(long milliseconds) const;
		/// Waits for the object to become signalled.
		/// Throws a TimeOutException if the object
		/// does not become signalled within the specified
		/// time interval.

	bool tryWait(long milliseconds) const;
		/// Waits for the object to become signalled.
		/// Returns true if the object
		/// became signalled within the specified
		/// time interval, false otherwise.

private:
	mutable Mutex _mutex;
	mutable Event _event;
};


//
// inlines
//
inline void SynchronizedObject::lock() const
{
	_mutex.lock();
}


inline bool SynchronizedObject::tryLock() const
{
	return _mutex.tryLock();
}


inline void SynchronizedObject::unlock() const
{
	_mutex.unlock();
}


inline void SynchronizedObject::notify() const
{
	_event.set();
}


inline void SynchronizedObject::wait() const
{
	_event.wait();
}


inline void SynchronizedObject::wait(long milliseconds) const
{
	_event.wait(milliseconds);
}


inline bool SynchronizedObject::tryWait(long milliseconds) const
{
	return _event.tryWait(milliseconds);
}


Foundation_END


#endif // Foundation_SynchronizedObject_INCLUDED