Multithread 之 wait

• Sleep
• void Sleep( DWORD dwMilliseconds );
• This function suspends the execution of the current thread for a specified interval.
• Busy Loop
• 不断调用GetExitCodeThread()，直到其结果不再是STILL_ACTIVE
• 缺点：浪费CPU时间
• WaitForSingleObject
• DWORD WaitForSingleObject( HANDLE hHandle, DWORD dwMilliseconds );
• This function returns when the specified object is in the signaled state or when the time-out interval elapses.
• Objecs：
• Event
• Mutex
• Semaphore
• Process
• Thread ：线程结束时，线程对象被激发（signaled state）。
• WaitForMultipleObjects
• DWORD WaitForMultipleObjects( DWORD nCount, CONST HANDLE* lpHandles, BOOL fWaitAll, DWORD dwMilliseconds );
• This function returns a value when either any one of the specified objects is in the signaled state, or the time-out interval elapses.
• MsgWaitForMultipleObjects
• DWORD MsgWaitForMultipleObjects( DWORD nCount, LPHANDLE pHandles, BOOL fWaitAll, DWORD dwMilliseconds, DWORD dwWakeMask );
• 可以同时等待消息或核心对象被激发，对GUI线程来说，可防止等待核心对象时，无法回到消息循环，界面无反应
• 参考:《Win32多线程程序设计》