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標題: C++多執行緒（五） [打印本頁]
作者: f66666602    時間: 2007-8-14 04:47
標題: C++多執行緒（五）

  2.    多執行緒之等待函數
  3. 一 等待函數

  5. 1）函數列舉

  7. [tr]            Wait function            Description        [/tr]         MsgWaitForMultipleObjects Waitsuntil one or all of the specified objects are in the signaled state orthe time-out interval elapses. The objects can include input eventobjects.
  8.          MsgWaitForMultipleObjectsEx Waitsuntil one or all of the specified objects are in the signaled state、anI/O completion routine or asynchronous procedure call (APC) is queuedto the thread、or the time-out interval elapses. The array of objectscan include input event objects.
  9.          RegisterWaitForSingleObject Directs a wait thread in the thread pool to wait on the object.
  10.          SignalObjectAndWait Atomically signals one object and waits on another object.
  11.          UnregisterWait Cancels a registered wait operation.
  12.          UnregisterWaitEx Cancels a registered wait operation.
  13.          WaitForMultipleObjects Waits until one or all of the specified objects are in the signaled state or the time-out interval elapses.
  14.          WaitForMultipleObjectsEx Waitsuntil one or all of the specified objects are in the signaled state、anI/O completion routine or asynchronous procedure call (APC) is queuedto the thread、or the time-out interval elapses.
  15.          WaitForSingleObject Waits until the specified object is in the signaled state or the time-out interval elapses.
  16.          WaitForSingleObjectEx Waitsuntil the specified object is in the signaled state、an I/O completionroutine or asynchronous procedure call (APC) is queued to the thread,or the time-out interval elapses.
  17.          WaitOrTimerCallback An application-defined function that serves as the starting address for a timer callback or a registered wait callback.


  20. [tr]            Waitable-timer function            Description        [/tr]         CancelWaitableTimer Sets the specified waitable timer to the inactive state.
  21.          CreateWaitableTimer Creates or opens a waitable timer object.
  22.          CreateWaitableTimerEx Creates or opens a waitable timer object and returns a handle to the object.
  23.          OpenWaitableTimer Opens an existing named waitable timer object.
  24.          SetWaitableTimer Activates the specified waitable timer.
  25.          TimerAPCProc Application-defined timer completion routine used with the SetWaitableTimer function.

  27. 2）簡單說明WaitForSingleObject

  29. DWORD WaitForSingleObject(HANDLE hObject,DWORD dwMilliseconds);
  30. 參數hObject：要等待的內核對象的句柄。
  31. 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。     
  32.                                      順便說一下，INFINITE已經定義為0xFFFFFFFF（或-1）。當然，傳遞INFINITE有些危險。如果對像永遠不變為已
  33.                                      通知狀態，那麼調用執行緒永遠不會被喚醒，它將永遠處於死鎖狀態。
  34. 返回值：WAIT_OBJECT_0表示要等待的對象已經變為已通知的狀態。
  35.                  WAIT_TIMEOUT表示設置的時間超時。
  36.                  WAIT_FAILED表示失敗，可能是傳入的handle不正確或其他的問題。

  38. DWORD dw = WaitForSingleObject(hProcess、5000);
  39. switch(dw)
  40. {
  41.    case WAIT_OBJECT_0:
  42.       // The process terminated.

  44. break;

  46.    case WAIT_TIMEOUT:
  47.       // The process did not terminate within 5000 milliseconds.

  49. break;

  51.    case WAIT_FAILED:
  52.       // Bad call to function (invalid handle?)

  54. break;
  55. }
  56. 3)簡單說明WaitForMultipleObjects
  57. DWORD WaitForMultipleObjects(DWORD dwCount,CONST HANDLE* phObjects,BOOL fWaitAll,DWORD dwMilliseconds);
  58. 參數dwCout：需要等待的內核對象的數量。
  59. 參數phObjects：需要等待的內核對象的是數組的指針。
  60. 參數fWaitAll：表示是否需要等待所有的內核對象。
  61. 參數dwMilliseconds：設置等待超時的時間。（同上函數）
  62. 返回值：WAIT_FAILED和WAIT_TIMEOUT同上函數。
  63. 如果為fWaitAll參數傳遞TRUE，同時所有對象均變為已通知狀態，那麼返回值是WAIT_OBJECT_0。如果為fWaitAll傳遞FALSE      ，那麼一旦任何一個對像變為已通知狀態，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。


  66. HANDLE h[3];
  67. h[0] = hProcess1;
  68. h[1] = hProcess2;
  69. h[2] = hProcess3;
  70. DWORD dw = WaitForMultipleObjects(3、h、FALSE、5000);
  71. switch(dw)
  72. {
  73.    case WAIT_FAILED:
  74.       // Bad call to function (invalid handle?)

  76. break;

  78.    case WAIT_TIMEOUT:
  79.       // None of the objects became signaled within 5000 milliseconds.

  81. break;

  83.    case WAIT_OBJECT_0 +
  84. 0:
  85.       // The process identified by h[0] (hProcess1) terminated.

  87. break;

  89.    case WAIT_OBJECT_0 +
  90. 1:
  91.       // The process identified by h[1] (hProcess2) terminated.

  93. break;

  95.    case WAIT_OBJECT_0 +
  96. 2:
  97.       // The process identified by h[2] (hProcess3) terminated.

  99. break;
  100. }

  102. 二 參考msdn和windows核心編程。



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