    // ------------------------------- //
    // -------- Start of File -------- //
    // ------------------------------- //
    // ----------------------------------------------------------- //
    // C++ Source Code File Name: testprog.cpp
    // Compiler Used: MSVC, BCC32, GCC, HPUX aCC, SOLARIS CC
    // Produced By: glNET Software
    // File Creation Date: 03/25/2000
    // Date Last Modified: 05/25/2001
    // Copyright (c) 2001 glNET Software
    // ----------------------------------------------------------- //
    // ------------- Program Description and Details ------------- //
    // ----------------------------------------------------------- //
    /*
    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

    Test program demonstrating the basic operation of the gxThread
    class using semaphores.
    */
    // ----------------------------------------------------------- //
    #include <iostream.h>
    #include <stdlib.h>
    #include "gxthread.h"
    #include "gxsema.h"

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

    // Constants
    const int NUM_THREADS = 3;

    // Global semaphore object
    gxSemaphore sema;

    // Shared data
    int sharedData1 = 0;
    int sharedData2 = 0;

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

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

    void *SimpleThread::ThreadEntryRoutine(gxThread_t *thread)
    {
      cout << "Entering thread" << endl;
      if(sema.SemaphoreWait() != 0) {
        cout << sema.SemaphoreExceptionMessage() << endl;
        return ExitThread(thread, 1);
      }

      // ********** Critical Section ******************* //
      cout << "Start critical section, holding semaphore" << endl;

      // Access to shared data goes here
      ++sharedData1; --sharedData2;
      cout << "sharedData1 = " << sharedData1 << ", sharedData2 = " << sharedData2
           << endl;

      cout << "End critical section, release semaphore" << endl;
      // ********** Critical Section ******************* //

      if(sema.SemaphorePost() != 0) {
        cout << sema.SemaphoreExceptionMessage() << endl;
        return ExitThread(thread, 1);
      }

      return 0;
    }

    int main(int argc, char **argv)
    {
    #ifdef __MSVC_DEBUG__
      InitLeakTest();
    #endif

      SimpleThread t;
      gxThread_t *thread[NUM_THREADS];
      int i;

      cout << "Wait on semaphore to prevent access to shared data" << endl;
      cout << "sharedData1 = " << sharedData1 << ", sharedData2 = " << sharedData2
           << endl;

      if(sema.SemaphoreWait() != 0) {
        cout << sema.SemaphoreExceptionMessage() << endl;
        return 0;
      }

      cout << "Creating " << NUM_THREADS << " threads" << endl;
      for(i = 0; i < NUM_THREADS; ++i) thread[i] = t.CreateThread();

      cout << "Wait a bit until we are done with the shared data" << endl;
      t.sSleep(3);

      cout << "Unlock shared data" << endl;
      if(sema.SemaphorePost() != 0) {
        cout << sema.SemaphoreExceptionMessage() << endl;
        return 0;
      }

      cout << "Wait for the threads to complete, and release their resources"
           << endl;
      for(i = 0; i < NUM_THREADS; ++i) t.JoinThread(thread[i]);

      // Prevent memory leaks
      for(i = 0; i < NUM_THREADS; ++i) delete thread[i];
      return 0;
    }
    // ----------------------------------------------------------- //
    // ------------------------------- //
    // --------- End of File --------- //
    // ------------------------------- //