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SynchronizedObject.h
//
// SynchronizedObject.h
//
// $Id: //poco/1.3/Foundation/include/Poco/SynchronizedObject.h#2 $
//
// Library: Foundation
// Package: Threading
// Module:  SynchronizedObject
//
// Definition of the SynchronizedObject class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// 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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef Foundation_SynchronizedObject_INCLUDED
#define Foundation_SynchronizedObject_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Mutex.h"
#include "Poco/Event.h"


namespace Poco {


00051 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 Poco::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:
00100       mutable Mutex _mutex;
      mutable Event _event;
};


//
// inlines
//
00108 inline void SynchronizedObject::lock() const
{
      _mutex.lock();
}


00114 inline bool SynchronizedObject::tryLock() const
{
      return _mutex.tryLock();
}


00120 inline void SynchronizedObject::unlock() const
{
      _mutex.unlock();
}


00126 inline void SynchronizedObject::notify() const
{
      _event.set();
}


00132 inline void SynchronizedObject::wait() const
{
      _event.wait();
}


00138 inline void SynchronizedObject::wait(long milliseconds) const
{
      _event.wait(milliseconds);
}


00144 inline bool SynchronizedObject::tryWait(long milliseconds) const
{
      return _event.tryWait(milliseconds);
}


} // namespace Poco


#endif // Foundation_SynchronizedObject_INCLUDED

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