Visual C++ .NET/Thread/Monitor

Sync By Monitor

<source lang="csharp">

1. include "stdafx.h"

using namespace System; using namespace System::Threading; ref class MyThread {

   static Object^ MonitorObject = gcnew Object();

public:

   void FOne();
   void FTwo();
   void FThree();

};

void MyThread::FOne() {

   Monitor::Enter(MonitorObject);
   for (Int32 i = 0; i < 3; i++)
   {
       Console::WriteLine("FOne   Waits  {0}", i.ToString());
       Monitor::Wait(MonitorObject);
       Console::WriteLine("FOne   Pulses {0}", i.ToString());
       Monitor::Pulse(MonitorObject);
       Thread::Sleep(1);
   }
   Monitor::Exit(MonitorObject);
   Console::WriteLine("FOne   exits monitor");

} void MyThread::FTwo() {

   Monitor::Enter(MonitorObject);
   for (Int32 i = 0; i < 3; i++)
   {
       Console::WriteLine("FTwo   Pulses {0}", i.ToString());
       Monitor::Pulse(MonitorObject);
       Thread::Sleep(1);
       Console::WriteLine("FTwo   Waits  {0}", i.ToString());
       Monitor::Wait(MonitorObject);
   }
   Monitor::Exit(MonitorObject);
   Console::WriteLine("FTwo   exits monitor");

} void MyThread::FThree() {

   if (!Monitor::TryEnter(MonitorObject))
   {
       Console::WriteLine("FThree was not able to lock");
       return;
   }
   Console::WriteLine("FThree got a lock");
   Monitor::Exit(MonitorObject);
   Console::WriteLine("FThree exits monitor");

}

void main() {

   MyThread ^myThr1 = gcnew MyThread();
   (gcnew Thread(gcnew ThreadStart(myThr1, &MyThread::FOne)))->Start();
   Thread::Sleep(2);

   (gcnew Thread(gcnew ThreadStart(myThr1, &MyThread::FTwo)))->Start();
   Thread::Sleep(2);
   for (int i = 0; i < 2; i++)
   {
       (gcnew Thread(
           gcnew ThreadStart(myThr1, &MyThread::FThree)))->Start();
       Thread::Sleep(50);
  }

}

 </source>