ThreadMutex1Example

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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

    gxMutex example program demonstrating how to protect access to
    shared data.
    */
    // ----------------------------------------------------------- //
    #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 NUMTHREADS = 3;

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

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

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

    public:
      void Begin();
      void End();

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

    public:
      gxThread_t *t[NUMTHREADS];
    };

    void *SimpleThread::ThreadEntryRoutine(gxThread_t *thread)
    {
      cout << "Entering thread" << "\n" << flush;
      mutex.MutexLock();

      //********** Critical Section *******************//
      cout << "Start critical section, holding lock" << "\n" << flush;

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

      cout << "End critical section, release lock" << "\n" << flush;
      //********** Critical Section *******************//

      mutex.MutexUnlock();
      return 0;
    }

    void SimpleThread::Begin()
    {
      for(int i = 0; i < NUMTHREADS; ++i) t[i] = CreateThread();
    }

    void SimpleThread::End()
    {
      for(int i = 0; i < NUMTHREADS; ++i) JoinThread(t[i]);
    }

    SimpleThread::~SimpleThread()
    {
      for(int i = 0; i < NUMTHREADS; ++i) {
        if(t[i]) delete t[i];
      }
    }

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

      SimpleThread t;

      cout << "Hold Mutex to prevent access to shared data" << "\n" << flush;
      cout << "sharedData1 = " << sharedData1 << ", sharedData2 = " << sharedData2
           << "\n" << flush;

      mutex.MutexLock();

      cout << "Create/start threads" << "\n" << flush;
      t.Begin();

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

      cout << "Unlock shared data" << "\n" << flush;
      mutex.MutexUnlock();

      cout << "Wait for the threads to complete, and release their resources"
           << "\n" << flush;
      t.End();

      return 0; // Exit the process
    }
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