windows同步（Windows synchronization）.docVIP

windows同步（Windows synchronization） 1. critical region CRITICAL_SECTION: Scope of application: it can only synchronize threads in a process, and can not synchronize across processes. Generally use it to do a single process within the code fast synchronization, the efficiency is relatively high. CRITICAL_SECTION _critical; (1) initialize the function that was first called. General windows programming has a similar initialization method InitializeCriticalSection ( _critical); (2) protect the code. When this function is called, other threads cannot access the resources later. EnterCriticalSection ( _critical) (3) leave the critical area to indicate that other threads can come in. LeaveCriticalSection ( _critical) (4) release the resource and make sure that the call is not used when _critical is used. It is usually called when the program exits. DeleteCriticalSection ( _critical) 2.HANDLE hEvent scope of application: more for thread communication, you can cross process synchronization. (1) initialize the method, create an event object, the first parameter represents the security attribute, and in general, the type of parameter is encountered directly to the null, and whether the second parameter is manually reset. There are two modes of operation in kernel time: manual reset and auto reset. The difference will be mentioned below. The third parameter is the initial state, and the fourth parameter event name. HEvent = CreateEvent (NULL, FALSE, FALSE, NULL); (2) wait for a single event to be set, that is, the thread will block in this function until the event is set, SetEvent. If it is an automatic reset event, the system automatically calls ResetEvent (hEvnet) after the return of the function, resetting the event to ensure that other threads cannot access it. If it is a manual reset event, the other threads of the system can continue to access after the function is returned. The second parameter indicates the waiting event, and the INIFINET indicates that it has been waiti