C++多執行緒（五）

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1. 
   
2.    多執行緒之等待函數
   
3. 一 等待函數
   
4. 
   
5. 1）函數列舉
   
6. 
   
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.
    
18. 
    
19. 
    
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.
    
26. 
    
27. 2）簡單說明WaitForSingleObject
    
28. 
    
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。
    
37. 
    
38. DWORD dw = WaitForSingleObject(hProcess、5000);
    
39. switch(dw)
    
40. {
    
41.    case WAIT_OBJECT_0:
    
42.       // The process terminated.
    
43. 
    
44. break;
    
45. 
    
46.    case WAIT_TIMEOUT:
    
47.       // The process did not terminate within 5000 milliseconds.
    
48. 
    
49. break;
    
50. 
    
51.    case WAIT_FAILED:
    
52.       // Bad call to function (invalid handle?)
    
53. 
    
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。
    
64. 
    
65. 
    
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?)
    
75. 
    
76. break;
    
77. 
    
78.    case WAIT_TIMEOUT:
    
79.       // None of the objects became signaled within 5000 milliseconds.
    
80. 
    
81. break;
    
82. 
    
83.    case WAIT_OBJECT_0 +
    
84. 0:
    
85.       // The process identified by h[0] (hProcess1) terminated.
    
86. 
    
87. break;
    
88. 
    
89.    case WAIT_OBJECT_0 +
    
90. 1:
    
91.       // The process identified by h[1] (hProcess2) terminated.
    
92. 
    
93. break;
    
94. 
    
95.    case WAIT_OBJECT_0 +
    
96. 2:
    
97.       // The process identified by h[2] (hProcess3) terminated.
    
98. 
    
99. break;
    
100. }
     
101. 
     
102. 二 參考msdn和windows核心編程。
     
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