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// -------- Start of File -------- //
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// ----------------------------------------------------------- //
// 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
gxMutex example program demonstrating how to protect access to
shared data.
*/
// ----------------------------------------------------------- //
#include <iostream.h>
#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 *thread[NUMTHREADS];
};
void *SimpleThread::ThreadEntryRoutine(gxThread_t *thread)
{
cout << "Entering thread" << endl;
mutex.MutexLock();
//********** Critical Section *******************//
cout << "Start critical section, holding lock" << endl;
// Access to shared data goes here
++sharedData1; --sharedData2;
cout << "sharedData1 = " << sharedData1 << ", sharedData2 = " << sharedData2
<< endl;
cout << "End critical section, release lock" << endl;
//********** Critical Section *******************//
mutex.MutexUnlock();
return 0;
}
void SimpleThread::Begin()
{
for(int i = 0; i < NUMTHREADS; ++i) thread[i] = CreateThread();
}
void SimpleThread::End()
{
for(int i = 0; i < NUMTHREADS; ++i) JoinThread(thread[i]);
}
SimpleThread::~SimpleThread()
{
for(int i = 0; i < NUMTHREADS; ++i) {
if(thread[i]) delete thread[i];
}
}
int main()
{
#ifdef __MSVC_DEBUG__
InitLeakTest();
#endif
SimpleThread t;
cout << "Hold Mutex to prevent access to shared data" << endl;
cout << "sharedData1 = " << sharedData1 << ", sharedData2 = " << sharedData2
<< endl;
mutex.MutexLock();
cout << "Create/start threads" << endl;
t.Begin();
cout << "Wait a until we are done with the shared data" << endl;
t.sSleep(3);
cout << "Unlock shared data" << endl;
mutex.MutexUnlock();
cout << "Wait for the threads to complete, and release their resources"
<< endl;
t.End();
return 0; // Exit the process
}
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