CreateSemaphore是干吗的?

创建信号灯， 一种内核对象的同步方式  

  使用步骤如下  
  1，创建信号灯  
  HANDLE   hCounter   =   CreateSemaphore(NULL,2,2,"iCounter")  
  2，打开信号灯  
  hCounterIn=OpenSemaphore(SEMAPHORE_ALL_ACCESS,FALSE,"iCounter")  
  3， 等待信号灯WaitForSingleObject(hCounterIn,INFINITE);   或
     dwWait = WaitForMultipleObjects(2, hWait, FALSE, INFINITE);
  4, 释放信号灯ReleaseSemaphore(hCounterIn,1,NULL);   
  5， 关闭句柄了CloseHandle(hCounter)

信号量，Event   等等这些东西   用来实现多进程/多线程通讯  

进程1    
  {  
      HANDLE     hEvent     =     CreateEvent(     NULL,     TRUE,     FALSE,     "MyName"     );  
      getch();  
      SetEvent(     hEvent     );//传递信号  
      CloseHandle(     hEvent     );  
      return     0;  
  }  
  进程2  
      HANDLE     hEvent     =     OpenEvent(     SYNCHRONIZE,     FALSE,     "MyName"     );  
      if(     hEvent     !=     NULL     )  
      {  
          WaitForSingleObject(     hEvent,     INFINITE     );  
      MessageBox(NULL,   "接收到信号",0   ,MB_ICONINFORMATION);  
            CloseHandle(     hEvent     );  
  }  
  return   0;  

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原址：http://274387.blog.51cto.com/264387/60969

HANDLE hThread;
HANDLE hEvent;

DWORD WINAPI ThreadProc1( LPVOID lpParamenter);int main(int argc, char* argv[]){
 // 更改第二个参数你会发现PulseEvent的用处,第三个参数用来设置初始状态是Singled还是Unsingled。
 hEvent = CreateEvent(NULL, TRUE, TRUE, "abc");
 hThread = CreateThread(NULL, NULL, ThreadProc1, NULL, NULL, NULL);
 Sleep(1);
 printf("1\n");
 PulseEvent(hEvent);
 Sleep(1);
 printf("2\n");
 SetEvent(hEvent);
 Sleep(1);
 printf("3\n");
 ResetEvent(hEvent);
 printf("4\n");
 PulseEvent(hEvent);
 Sleep(1);
 printf("5\n");
 TerminateThread(hThread, NULL);
 printf("Hello World!\n");
 return 0;
}

DWORD WINAPI ThreadProc1( LPVOID lParamenter )
{
 int iCount = 0;
 while( true )
 {
  printf("xx%d\t", iCount++);
  WaitForSingleObject(hEvent, INFINITE);
  printf("**%d\t", iCount++);
 }
 return NULL;
}