/usr/include/ptlib/psync.h is in libpt-dev 2.10.11~dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
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* psync.h
*
* Abstract synchronisation semaphore class.
*
* Portable Tools Library
*
* Copyright (c) 1993-1998 Equivalence Pty. Ltd.
* Copyright (c) 2005 Post Increment
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Portable Windows Library.
*
* The Initial Developer of the Original Code is Equivalence Pty. Ltd.
*
* Portions are Copyright (C) 1993 Free Software Foundation, Inc.
* All Rights Reserved.
*
* Contributor(s): ______________________________________.
*
* $Revision: 27923 $
* $Author: rjongbloed $
* $Date: 2012-06-27 22:28:36 -0500 (Wed, 27 Jun 2012) $
*/
#ifndef PTLIB_SYNC_H
#define PTLIB_SYNC_H
#ifdef P_USE_PRAGMA
#pragma interface
#endif
#include <ptlib/contain.h>
#include <ptlib/object.h>
class PSync : public PObject
{
public:
/**@name Operations */
//@{
/**Block until the synchronisation object is available.
*/
virtual void Wait() = 0;
/**Signal that the synchronisation object is available.
*/
virtual void Signal() = 0;
//@}
};
class PSyncNULL : public PSync
{
public:
virtual void Wait() { }
virtual void Signal() { }
};
/**This class waits for the semaphore on construction and automatically
signals the semaphore on destruction. Any descendent of PSemaphore
may be used.
This is very useful for constructs such as:
<pre><code>
void func()
{
PWaitAndSignal mutexWait(myMutex);
if (condition)
return;
do_something();
if (other_condition)
return;
do_something_else();
}
</code></pre>
*/
class PWaitAndSignal {
public:
/**Create the semaphore wait instance.
This will wait on the specified semaphore using the Wait() function
before returning.
*/
inline PWaitAndSignal(
const PSync & sem, ///< Semaphore descendent to wait/signal.
PBoolean wait = true ///< Wait for semaphore before returning.
) : sync((PSync &)sem)
{ if (wait) sync.Wait(); }
/** Signal the semaphore.
This will execute the Signal() function on the semaphore that was used
in the construction of this instance.
*/
~PWaitAndSignal()
{ sync.Signal(); }
protected:
PSync & sync;
};
#endif // PTLIB_SYNC_H
// End Of File ///////////////////////////////////////////////////////////////
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