pprocess.h

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/*
 * pprocess.h
 *
 * Operating System Process (running program executable) 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: pprocess.h,v $
 * Revision 1.71  2005/11/30 12:47:38  csoutheren
 * Removed tabs, reformatted some code, and changed tags for Doxygen
 *
 * Revision 1.70  2005/11/25 03:43:47  csoutheren
 * Fixed function argument comments to be compatible with Doxygen
 *
 * Revision 1.69  2005/01/26 05:37:54  csoutheren
 * Added ability to remove config file support
 *
 * Revision 1.68  2004/06/30 12:17:04  rjongbloed
 * Rewrite of plug in system to use single global variable for all factories to avoid all sorts
 *   of issues with startup orders and Windows DLL multiple instances.
 *
 * Revision 1.67  2004/05/27 04:46:42  csoutheren
 * Removed vestigal Macintosh code
 *
 * Revision 1.66  2004/05/21 00:28:39  csoutheren
 * Moved PProcessStartup creation to PProcess::Initialise
 * Added PreShutdown function and called it from ~PProcess to handle PProcessStartup removal
 *
 * Revision 1.65  2004/05/19 22:27:19  csoutheren
 * Added fix for gcc 2.95
 *
 * Revision 1.64  2004/05/18 21:49:25  csoutheren
 * Added ability to display trace output from program startup via environment
 * variable or by application creating a PProcessStartup descendant
 *
 * Revision 1.63  2004/05/18 06:01:06  csoutheren
 * Deferred plugin loading until after main has executed by using abstract factory classes
 *
 * Revision 1.62  2004/05/13 14:54:57  csoutheren
 * Implement PProcess startup and shutdown handling using abstract factory classes
 *
 * Revision 1.61  2003/11/25 08:28:13  rjongbloed
 * Removed ability to have platform without threads, win16 finally deprecated
 *
 * Revision 1.60  2003/09/17 05:41:59  csoutheren
 * Removed recursive includes
 *
 * Revision 1.59  2003/09/17 01:18:02  csoutheren
 * Removed recursive include file system and removed all references
 * to deprecated coooperative threading support
 *
 * Revision 1.58  2002/12/11 22:23:59  robertj
 * Added ability to set user identity temporarily and permanently.
 * Added get and set users group functions.
 *
 * Revision 1.57  2002/12/02 03:57:18  robertj
 * More RTEMS support patches, thank you Vladimir Nesic.
 *
 * Revision 1.56  2002/10/17 13:44:27  robertj
 * Port to RTEMS, thanks Vladimir Nesic.
 *
 * Revision 1.55  2002/10/17 07:17:42  robertj
 * Added ability to increase maximum file handles on a process.
 *
 * Revision 1.54  2002/10/10 04:43:43  robertj
 * VxWorks port, thanks Martijn Roest
 *
 * Revision 1.53  2002/09/16 01:08:59  robertj
 * Added #define so can select if #pragma interface/implementation is used on
 *   platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan.
 *
 * Revision 1.52  2002/07/30 02:55:48  craigs
 * Added program start time to PProcess
 * Added virtual to GetVersion etc
 *
 * Revision 1.51  2002/02/14 05:13:33  robertj
 * Fixed possible deadlock if a timer is deleted (however indirectly) in the
 *   OnTimeout of another timer.
 *
 * Revision 1.50  2001/11/23 06:59:29  robertj
 * Added PProcess::SetUserName() function for effective user changes.
 *
 * Revision 1.49  2001/08/11 07:57:30  rogerh
 * Add Mac OS Carbon changes from John Woods <[e-mail]>
 *
 * Revision 1.48  2001/05/22 12:49:32  robertj
 * Did some seriously wierd rewrite of platform headers to eliminate the
 *   stupid GNU compiler warning about braces not matching.
 *
 * Revision 1.47  2001/03/09 05:50:48  robertj
 * Added ability to set default PConfig file or path to find it.
 *
 * Revision 1.46  2001/01/02 07:47:44  robertj
 * Fixed very narrow race condition in timers (destroyed while in OnTimeout()).
 *
 * Revision 1.45  2000/08/30 03:16:59  robertj
 * Improved multithreaded reliability of the timers under stress.
 *
 * Revision 1.44  2000/04/03 18:42:40  robertj
 * Added function to determine if PProcess instance is initialised.
 *
 * Revision 1.43  2000/02/29 12:26:14  robertj
 * Added named threads to tracing, thanks to Dave Harvey
 *
 * Revision 1.42  1999/03/09 02:59:50  robertj
 * Changed comments to doc++ compatible documentation.
 *
 * Revision 1.41  1999/02/16 08:11:09  robertj
 * MSVC 6.0 compatibility changes.
 *
 * Revision 1.40  1999/01/30 14:28:10  robertj
 * Added GetOSConfigDir() function.
 *
 * Revision 1.39  1999/01/11 11:27:11  robertj
 * Added function to get the hardware process is running on.
 *
 * Revision 1.38  1998/11/30 02:51:00  robertj
 * New directory structure
 *
 * Revision 1.37  1998/10/18 14:28:44  robertj
 * Renamed argv/argc to eliminate accidental usage.
 *
 * Revision 1.36  1998/10/13 14:06:13  robertj
 * Complete rewrite of memory leak detection code.
 *
 * Revision 1.35  1998/09/23 06:21:10  robertj
 * Added open source copyright license.
 *
 * Revision 1.34  1998/09/14 12:30:38  robertj
 * Fixed memory leak dump under windows to not include static globals.
 *
 * Revision 1.33  1998/04/07 13:33:53  robertj
 * Changed startup code to support PApplication class.
 *
 * Revision 1.32  1998/04/01 01:56:21  robertj
 * Fixed standard console mode app main() function generation.
 *
 * Revision 1.31  1998/03/29 06:16:44  robertj
 * Rearranged initialisation sequence so PProcess descendent constructors can do "things".
 *
 * Revision 1.30  1998/03/20 03:16:10  robertj
 * Added special classes for specific sepahores, PMutex and PSyncPoint.
 *
 * Revision 1.29  1997/07/08 13:13:46  robertj
 * DLL support.
 *
 * Revision 1.28  1997/04/27 05:50:13  robertj
 * DLL support.
 *
 * Revision 1.27  1997/02/05 11:51:56  robertj
 * Changed current process function to return reference and validate objects descendancy.
 *
 * Revision 1.26  1996/06/28 13:17:08  robertj
 * Fixed incorrect declaration of internal timer list.
 *
 * Revision 1.25  1996/06/13 13:30:49  robertj
 * Rewrite of auto-delete threads, fixes Windows95 total crash.
 *
 * Revision 1.24  1996/05/23 09:58:47  robertj
 * Changed process.h to pprocess.h to avoid name conflict.
 * Added mutex to timer list.
 *
 * Revision 1.23  1996/05/18 09:18:30  robertj
 * Added mutex to timer list.
 *
 * Revision 1.22  1996/04/29 12:18:48  robertj
 * Added function to return process ID.
 *
 * Revision 1.21  1996/03/12 11:30:21  robertj
 * Moved destructor to platform dependent code.
 *
 * Revision 1.20  1996/02/25 11:15:26  robertj
 * Added platform dependent Construct function to PProcess.
 *
 * Revision 1.19  1996/02/03 11:54:09  robertj
 * Added operating system identification functions.
 *
 * Revision 1.18  1996/01/02 11:57:17  robertj
 * Added thread for timers.
 *
 * Revision 1.17  1995/12/23 03:46:02  robertj
 * Changed version numbers.
 *
 * Revision 1.16  1995/12/10 11:33:36  robertj
 * Added extra user information to processes and applications.
 * Changes to main() startup mechanism to support Mac.
 *
 * Revision 1.15  1995/06/17 11:13:05  robertj
 * Documentation update.
 *
 * Revision 1.14  1995/06/17 00:43:10  robertj
 * Made PreInitialise virtual for NT service support
 *
 * Revision 1.13  1995/03/14 12:42:14  robertj
 * Updated documentation to use HTML codes.
 *
 * Revision 1.12  1995/03/12  04:43:26  robertj
 * Remvoed redundent destructor.
 *
 * Revision 1.11  1995/01/11  09:45:09  robertj
 * Documentation and normalisation.
 *
 * Revision 1.10  1994/08/23  11:32:52  robertj
 * Oops
 *
 * Revision 1.9  1994/08/22  00:46:48  robertj
 * Added pragma fro GNU C++ compiler.
 *
 * Revision 1.8  1994/08/21  23:43:02  robertj
 * Added function to get the user name of the owner of a process.
 *
 * Revision 1.7  1994/08/04  11:51:04  robertj
 * Moved OperatingSystemYield() to protected for Unix.
 *
 * Revision 1.6  1994/08/01  03:42:23  robertj
 * Destructor needed for heap debugging.
 *
 * Revision 1.5  1994/07/27  05:58:07  robertj
 * Synchronisation.
 *
 * Revision 1.4  1994/07/21  12:33:49  robertj
 * Moved cooperative threads to common.
 *
 * Revision 1.3  1994/06/25  11:55:15  robertj
 * Unix version synchronisation.
 *
 */

#ifndef _PPROCESS
#define _PPROCESS

#ifdef P_USE_PRAGMA
#pragma interface
#endif

#include <ptlib/mutex.h>
#include <ptlib/syncpoint.h>
#include <ptlib/pfactory.h>


/**Create a process.
   This macro is used to create the components necessary for a user PWLib
   process. For a PWLib program to work correctly on all platforms the
   #main()# function must be defined in the same module as the
   instance of the application.
 */
#ifdef P_VXWORKS
#define PCREATE_PROCESS(cls) \
  PProcess::PreInitialise(0, NULL, NULL); \
  cls instance; \
  instance._main();
#elif defined(P_RTEMS)
#define PCREATE_PROCESS(cls) \
extern "C" {\
   void* POSIX_Init( void* argument) \
     { PProcess::PreInitialise(0, 0, 0); \
       static cls instance; \
       exit( instance._main() ); \
     } \
}
#else
#define PCREATE_PROCESS(cls) \
  int main(int argc, char ** argv, char ** envp) \
    { PProcess::PreInitialise(argc, argv, envp); \
      static cls instance; \
      return instance._main(); \
    }
#endif // P_VXWORKS

/*$MACRO PDECLARE_PROCESS(cls,ancestor,manuf,name,major,minor,status,build)
   This macro is used to declare the components necessary for a user PWLib
   process. This will declare the PProcess descendent class, eg PApplication,
   and create an instance of the class. See the #PCREATE_PROCESS# macro
   for more details.
 */
#define PDECLARE_PROCESS(cls,ancestor,manuf,name,major,minor,status,build) \
  class cls : public ancestor { \
    PCLASSINFO(cls, ancestor); \
    public: \
      cls() : ancestor(manuf, name, major, minor, status, build) { } \
    private: \
      virtual void Main(); \
  };


PLIST(PInternalTimerList, PTimer);

class PTimerList : PInternalTimerList // Want this to be private
/* This class defines a list of #PTimer# objects. It is primarily used
   internally by the library and the user should never create an instance of
   it. The #PProcess# instance for the application maintains an instance
   of all of the timers created so that it may decrements them at regular
   intervals.
 */
{
  PCLASSINFO(PTimerList, PInternalTimerList);

  public:
    PTimerList();
    // Create a new timer list

    PTimeInterval Process();
    /* Decrement all the created timers and dispatch to their callback
       functions if they have expired. The #PTimer::Tick()# function
       value is used to determine the time elapsed since the last call to
       Process().

       The return value is the number of milliseconds until the next timer
       needs to be despatched. The function need not be called again for this
       amount of time, though it can (and usually is).
       
       @return
       maximum time interval before function should be called again.
     */

  private:
    PMutex listMutex, processingMutex, inTimeoutMutex;
    // Mutual exclusion for multi tasking

    PTimeInterval lastSample;
    // The last system timer tick value that was used to process timers.

    PTimer * currentTimer;
    // The timer which is currently being handled

  friend class PTimer;
};


///////////////////////////////////////////////////////////////////////////////
// PProcess

/**This class represents an operating system process. This is a running
   "programme" in the  context of the operating system. Note that there can
   only be one instance of a PProcess class in a given programme.
   
   The instance of a PProcess or its GUI descendent #PApplication# is
   usually a static variable created by the application writer. This is the
   initial "anchor" point for all data structures in an application. As the
   application writer never needs to access the standard system
   #main()# function, it is in the library, the programmes
   execution begins with the virtual function #PThread::Main()# on a
   process.
 */
class PProcess : public PThread
{
  PCLASSINFO(PProcess, PThread);

  public:
  /**@name Construction */
  //@{
    /// Release status for the program.
    enum CodeStatus {
      /// Code is still very much under construction.
      AlphaCode,    
      /// Code is largely complete and is under test.
      BetaCode,     
      /// Code has all known bugs removed and is shipping.
      ReleaseCode,  
      NumCodeStatuses
    };

    /** Create a new process instance.
     */
    PProcess(
      const char * manuf = "",         ///< Name of manufacturer
      const char * name = "",          ///< Name of product
      WORD majorVersion = 1,           ///< Major version number of the product
      WORD minorVersion = 0,           ///< Minor version number of the product
      CodeStatus status = ReleaseCode, ///< Development status of the product
      WORD buildNumber = 1             ///< Build number of the product
    );
  //@}

  /**@name Overrides from class PObject */
  //@{
    /**Compare two process instances. This should almost never be called as
       a programme only has access to a single process, its own.

       @return
       #EqualTo# if the two process object have the same name.
     */
    Comparison Compare(
      const PObject & obj   ///< Other process to compare against.
    ) const;
  //@}

  /**@name Overrides from class PThread */
  //@{