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            C++ Programmer's Cookbook

            {C++ 基礎} {C++ 高級} {C#界面,C++核心算法} {設計模式} {C#基礎}

            C++多線程(五)

             
            多線程之等待函數
            一 等待函數

            1)函數列舉

            Wait function Description
            MsgWaitForMultipleObjects Waits until one or all of the specified objects are in the signaled state or the time-out interval elapses. The objects can include input event objects.
            MsgWaitForMultipleObjectsEx Waits until one or all of the specified objects are in the signaled state, an I/O completion routine or asynchronous procedure call (APC) is queued to the thread, or the time-out interval elapses. The array of objects can include input event objects.
            RegisterWaitForSingleObject Directs a wait thread in the thread pool to wait on the object.
            SignalObjectAndWait Atomically signals one object and waits on another object.
            UnregisterWait Cancels a registered wait operation.
            UnregisterWaitEx Cancels a registered wait operation.
            WaitForMultipleObjects Waits until one or all of the specified objects are in the signaled state or the time-out interval elapses.
            WaitForMultipleObjectsEx Waits until one or all of the specified objects are in the signaled state, an I/O completion routine or asynchronous procedure call (APC) is queued to the thread, or the time-out interval elapses.
            WaitForSingleObject Waits until the specified object is in the signaled state or the time-out interval elapses.
            WaitForSingleObjectEx Waits until the specified object is in the signaled state, an I/O completion routine or asynchronous procedure call (APC) is queued to the thread, or the time-out interval elapses.
            WaitOrTimerCallback An application-defined function that serves as the starting address for a timer callback or a registered wait callback.


            Waitable-timer function Description
            CancelWaitableTimer Sets the specified waitable timer to the inactive state.
            CreateWaitableTimer Creates or opens a waitable timer object.
            CreateWaitableTimerEx Creates or opens a waitable timer object and returns a handle to the object.
            OpenWaitableTimer Opens an existing named waitable timer object.
            SetWaitableTimer Activates the specified waitable timer.
            TimerAPCProc Application-defined timer completion routine used with the SetWaitableTimer function.


            2)簡單說明WaitForSingleObject

            DWORD WaitForSingleObject(HANDLE hObject,DWORD dwMilliseconds);

            參數hObject:要等待的內核對象的句柄。
            參數dwMilliseconds: 設置的等待超時的時間,以毫秒為單位。可以設置為INGINIT。     
                                                 順便說一下,INFINITE已經定義為0xFFFFFFFF(或-1)。當然,傳遞INFINITE有些危險。如果對象永遠不變為已
                                                 通知狀態,那么調用線程永遠不會被喚醒,它將永遠處于死鎖狀態。
            返回值:WAIT_OBJECT_0表示要等待的對象已經變為已通知的狀態。
                             WAIT_TIMEOUT表示設置的時間超時。
                             WAIT_FAILED表示失敗,可能是傳入的handle不正確或其他的問題。

            DWORD dw = WaitForSingleObject(hProcess, 5000);
            switch(dw)
            {
               
            case WAIT_OBJECT_0:
                  
            // The process terminated.
                  break;

               
            case WAIT_TIMEOUT:
                  
            // The process did not terminate within 5000 milliseconds.
                  break;

               
            case WAIT_FAILED:
                  
            // Bad call to function (invalid handle?)
                  break;
            }

            3)簡單說明WaitForMultipleObjects

            DWORD WaitForMultipleObjects(DWORD dwCount,CONST HANDLE* phObjects,BOOL fWaitAll,DWORD dwMilliseconds);

            參數dwCout:需要等待的內核對象的數量。
            參數phObjects:需要等待的內核對象的是數組的指針。
            參數fWaitAll:表示是否需要等待所有的內核對象。
            參數dwMilliseconds:設置等待超時的時間。(同上函數)

            返回值:WAIT_FAILED和WAIT_TIMEOUT同上函數。
             如果為fWaitAll參數傳遞TRUE,同時所有對象均變為已通知狀態,那么返回值是WAIT_OBJECT_0。如果為fWaitAll傳遞FALSE       ,那么一旦任何一個對象變為已通知狀態,該函數便返回。在這種情況下,你可能想要知道哪個對象變為已通知狀態。返回值是WAIT_OBJECT_0與(WAIT_OBJECT_0+dwCount- 1)之間的一個值。

            HANDLE h[3];
            h[
            0= hProcess1;
            h[
            1= hProcess2;
            h[
            2= hProcess3;
            DWORD dw 
            = WaitForMultipleObjects(3, h, FALSE, 5000);
            switch(dw) 
            {
               
            case WAIT_FAILED:
                  
            // Bad call to function (invalid handle?)
                  break;

               
            case WAIT_TIMEOUT:
                  
            // None of the objects became signaled within 5000 milliseconds.
                  break;

               
            case WAIT_OBJECT_0 + 0:
                  
            // The process identified by h[0] (hProcess1) terminated.
                  break;

               
            case WAIT_OBJECT_0 + 1:
                  
            // The process identified by h[1] (hProcess2) terminated.
                  break;

               
            case WAIT_OBJECT_0 + 2:
                  
            // The process identified by h[2] (hProcess3) terminated.
                  break;
            }


            二 參考msdn和windows核心編程。

            posted on 2007-07-28 10:36 夢在天涯 閱讀(6280) 評論(1)  編輯 收藏 引用 所屬分類: CPlusPlus

            評論

            # re: C++多線程(五) 2009-06-10 11:16 aniki

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