ThreadCond2Example

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    // C++ Source Code File Name: testprog.cpp
    // Compiler Used: MSVC, BCC32, GCC, HPUX aCC, SOLARIS CC
    // Produced By: DataReel Software Development Team
    // File Creation Date: 03/25/2000
    // Date Last Modified: 06/17/2016
    // Copyright (c) 2001-2016 DataReel Software Development
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    // ------------- Program Description and Details ------------- //
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    /*
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
    USA

    Simple test program demonstrating the basic operation of the
    gxThread class using mutex and condition variable synchronization
    primitives.
    */
    // ----------------------------------------------------------- //
    #include "gxdlcode.h"

    #if defined (__USE_ANSI_CPP__) // Use the ANSI Standard C++ library
    #include <iostream>
    using namespace std; // Use unqualified names for Standard C++ library
    #else // Use the old iostream library by default
    #include <iostream.h>
    #endif // __USE_ANSI_CPP__

    #include "gxthread.h"
    #include "gxmutex.h"
    #include "gxcond.h"

    #ifdef __MSVC_DEBUG__
    #include "leaktest.h"
    #endif

    // Constants
    const int max_reps = 10;

    // Global variables
    char buffer;
    int buffer_has_item = 0;
    int num_reps;

    // Global synchronization objects
    gxMutex mutex;
    gxCondition condition;

    // Standalone function that works with the reader class
    inline char make_new_item() { return 'A' + num_reps; }
    inline void consume_item(char &c) { c = 0; }
    void WriterFunction();

    // Class derived from the abstract gxThread base class
    class ReaderClass : public gxThread
    {
    public:
      ReaderClass() { }
      ~ReaderClass() { }

    private: // Base class interface
      void *ThreadEntryRoutine(gxThread_t *thread);
    };

    // Program's main thread of execution
    int main()
    {
    #ifdef __MSVC_DEBUG__
      InitLeakTest();
    #endif

      // Set the rep count to zero
      num_reps = 0;

      ReaderClass t;
      gxThread_t *tptr = t.CreateThread();

      WriterFunction();

      // Wait for the thread to consume the last item before exiting
      t.sSleep(3);

      delete tptr; // Prevent memory leaks
      return 0;
    }

    void *ReaderClass::ThreadEntryRoutine(gxThread_t *thread)
    {
      while(num_reps < max_reps) {
        mutex.MutexLock();
        condition.ConditionTimedWait(&mutex, 1);
        if(buffer_has_item == 1) {
          cout << "Comsuing item: " << buffer << "\n" << flush;
          consume_item(buffer);
          buffer_has_item = 0;
        }
        mutex.MutexUnlock();
      }
      return 0;
    }

    void WriterFunction()
    {
      while(num_reps < max_reps) {
        mutex.MutexLock();
        condition.ConditionTimedWait(&mutex, 1);
          if(buffer_has_item == 0) {
    	buffer = make_new_item();
    	cout << "Making item: " << buffer << "\n" << flush;
    	buffer_has_item = 1;
    	num_reps++;
          }
          mutex.MutexUnlock();
      }
    }
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