[Ace-users] Why the spawned thread must be waited?

[gebenxiang at gmail.com]

Hi all,
    I am developing a windows client with MFC and ACE. For user-
friendliness, the request to the server can be  cancelled. I put two
threads in the client, one is for UI, the other is for network
commucation.

    I want to use the active object pattern to handle the net
request:
1. The MFC message handler received a button-click event
2. The message handler creates an agent proxy and an
ACE_Future_Observer object
   (exactly like %ACE_ROOT%/examples/apg/active_objects/AO2.cpp)
3. When the request completed, the ACE_Future_Observer object would
get the result, then notify the UI thread.

    Now I face a problem: if I don't call ACE_Thread_Manager::instance
()->wait(), the spawned thread would crash; but when I call it, the UI
thread would be blocked (and it would succeed to get the result).

    Why must we wait the spawned thread?

    When activated it, I used the flag (THR_NEW_LWP | THR_DETACHED).


Best regards

John Ge