ThreadMutex2Example

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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
    // ----------------------------------------------------------- //
    // ------------- 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

    Mutex example used to show how corruption can result if no
    serialization is done.
    */
    // ----------------------------------------------------------- //
    #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"

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

    // Constants
    const int LOOPCONSTANT = 100000;
    const int NUM_THREADS = 10;

    // Mutex that will be shared by threads within this process
    gxMutex mutex;

    // Global variables
    int i, j, k, l;
    int uselock = 1; // TRUE if locking shared data

    class SimpleThread : public gxThread
    {
    public:
      SimpleThread() { }
      ~SimpleThread() { }

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

    void *SimpleThread::ThreadEntryRoutine(gxThread_t *thread)
    {
      for(int loop=0; loop < LOOPCONSTANT; ++loop) {
        if(uselock) { // Lock critical section if uselock is true
          if(mutex.MutexLock() != 0) {
    	cout << mutex.MutexExceptionMessage() << "\n" << flush;
    	return ExitThread(thread, 1);
          }
        }

        // Shared data
        ++i; ++j; ++k; ++l;

        if(uselock) {
          if(mutex.MutexUnlock() != 0) {
    	cout << mutex.MutexExceptionMessage() << "\n" << flush;
    	return ExitThread(thread, 1);
          }
        }
      }

      return 0;
    }

    int main()
    {
    #ifdef __MSVC_DEBUG__
      InitLeakTest();
    #endif

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

      cout << "Creating " << NUM_THREADS << " threads" << "\n" << flush;
      for(loop = 0; loop < NUM_THREADS; ++loop)
        thread[loop] = t.CreateThread();

      cout << "Wait for results" << "\n" << flush;
      t.sSleep(10);

      cout << "Show results" << "\n" << flush;
      cout << "Using " << NUM_THREADS << " threads and " << LOOPCONSTANT
           << " loop constant" << "\n" << flush;
      cout << "Values are: (should be " << (NUM_THREADS * LOOPCONSTANT)
           << ")" << "\n" << flush;
      cout << "  ==>" << i << ' ' << j << ' ' << k << ' ' << l << "\n" << flush;

      cout << "Main thread completed" << "\n" << flush;

      // Prevent memory leaks
      for(loop = 0; loop < NUM_THREADS; ++loop) delete thread[loop];

      return 0;
    }
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