多线程和锁的运用

//注释掉的地方时另一种锁的应用

#include <windows.h>
#include <iostream.h>
int i = 0;
HANDLE hMutex;
DWORD WINAPI threadproc1(LPVOID lpParameter);
DWORD WINAPI threadproc2(LPVOID lpParameter);
CRITICAL_SECTION   Semo;
int main(int argc, char* argv[])
{
   HANDLE hthread1, hthread2;
   hMutex = CreateMutex(NULL, FALSE, "ru");

   if(GetLastError() == ERROR_ALREADY_EXISTS)
   {
       cout<<"已经有一个实例开启！"<<endl;
    return 0;
   }
   //InitializeCriticalSection(&Semo);
   hthread1 = CreateThread(NULL, 0,threadproc1, NULL, 0, NULL);
   hthread2 = CreateThread(NULL, 0,threadproc2, NULL, 0, NULL);
 
   while(1)
   {  
    WaitForSingleObject(hMutex,INFINITE);
    //::EnterCriticalSection(&Semo);
    if(i < 100)
    {
     cout<<"thread3"<<"  "<<i<<endl;
     i++;
    
    }
    ReleaseMutex(hMutex);
   // ::LeaveCriticalSection(&Semo);
    if(i == 100)  break;
 } 

   CloseHandle(hthread1);
   CloseHandle(hthread2);
   Sleep(5000);
   return 0;
}

DWORD WINAPI threadproc1(LPVOID lpParameter)
{
 while(1)
  {
  WaitForSingleObject(hMutex,INFINITE);
  //::EnterCriticalSection(&Semo);
        if(i < 100)
  {
            cout<<"thread1"<<"  "<<i<<endl;
   i++;
   
  }
  if(i == 100)  break;
  ReleaseMutex(hMutex);
  //::LeaveCriticalSection(&Semo);
 } 
 return 0;
}

DWORD WINAPI threadproc2(LPVOID lpParameter)
{
 while(1)
 {
  WaitForSingleObject(hMutex,INFINITE);
  //::EnterCriticalSection(&Semo);
        if(i < 100)
  {
            cout<<"thread2"<<"  "<<i<<endl;
   i++;
  
  }
     ReleaseMutex(hMutex);
  //::LeaveCriticalSection(&Semo);
 }
    return 0;
}