[ace-users] Need help to resolve the hang with ACE Reactor usage

[Douglas C. Schmidt]

Hi Sukum,

> We are using ACE_Reactor pattern to register and take the reaction on certain
> handles.

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Therefore, please make sure you are using ACE+TAO+CIAO+DAnCE x.3.1
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If you need more "predictable" help or need help for earlier versions
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Thanks,

        Doug


> We are using remove handler with NULL_MASK to remove the handle forcefully from
> ace internal handler as follows
> 
>  
> 
> thePReactor->remove_handler(this->m_shutDownEvent->handle
> (),ACE_Event_Handler::NULL_MASK);
> 
> int HttpCommand::handle_close (ACE_HANDLE handle, ACE_Reactor_Mask close_mask)
> 
> {
> 
>       UNREFERENCED_PARAMETER(close_mask);
> 
>       UNREFERENCED_PARAMETER(handle);
> 
>  
> 
>     ACE_DEBUG((LM_DEBUG,"HttpCommand::handle_close \n"));
> 
>       m_safeToDestructEvent.signal();
> 
>     return 0;
> 
> }
> 
>  
> 
> The call back handle_close() should be invoked when we remove handler with
> NULL_MASK. In one of the use case this doesn?t happen and our application is
> hanging  as in attached call stack
> 
> and we don?t see that call back gets invoked at these times(When app hangs)
> 
>  
> 
> Changing the reactor mask type to DONT_CALL has fixed this issue. I don?t see
> hanging any more .  Can you please let me know what happens in background when
> the reactor type is NULL_MASK and the reason for app hang?
> 
> Does this wait for any process mutex to invoke handle_close callback.?
> 
>  
> 
> When we use DON?T_CALL instead NULL_MASK it solved the issue but we need to
> know what?s the issue in depth. Please let us know if you have any information
> on same
> 
>  
> 
> Thanks in advance
> 
>  
> 
> Regards
> 
> Sukumar
> 
>  
> 
> 
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