mutex.h
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- /*
- * mutex.h
- *
- * Mutual exclusion thread synchonisation class.
- *
- * Portable Windows Library
- *
- * Copyright (c) 1993-1998 Equivalence Pty. Ltd.
- *
- * 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): ______________________________________.
- *
- * $Log: mutex.h,v $
- * Revision 1.5 1999/03/09 02:59:50 robertj
- * Changed comments to doc++ compatible documentation.
- *
- * Revision 1.4 1999/02/16 08:12:22 robertj
- * MSVC 6.0 compatibility changes.
- *
- * Revision 1.3 1998/11/30 02:50:59 robertj
- * New directory structure
- *
- * Revision 1.2 1998/09/23 06:20:55 robertj
- * Added open source copyright license.
- *
- * Revision 1.1 1998/03/23 02:41:31 robertj
- * Initial revision
- *
- */
- #define _PMUTEX
- #ifdef __GNUC__
- #pragma interface
- #endif
- #include <ptlib/semaphor.h>
- /**This class defines a thread mutual exclusion object. A mutex is where a
- piece of code or data cannot be accessed by more than one thread at a time.
- To prevent this the PMutex is used in the following manner:
- begin{verbatim}
- PMutex mutex;
- ...
- mutex.Wait();
- ... critical section - only one thread at a time here.
- mutex.Signal();
- ...
- end{verbatim}
- The first thread will pass through the #Wait()# function, a second
- thread will block on that function until the first calls the
- #Signal()# function, releasing the second thread.
- */
- class PMutex : public PSemaphore
- {
- PCLASSINFO(PMutex, PSemaphore);
- public:
- /* Create a new mutex.
- Initially the mutex will not be "set", so the first call to Wait() will
- never wait.
- */
- PMutex();
- #ifdef DOC_PLUS_PLUS
- };
- #endif
- // Class declaration continued in platform specific header file ///////////////