Re: exported.writes inside a hook threadlock?

On Mon, 12 Apr 2004 00:56:05 -0500
  [email protected] wrote:
>
>Is Lyntin expected to freeze when I perform
>exported.write_user_data in a to_user_hook?

Sure, it will hang. To be more precise, it could be 
eventually aborted due to stack overflow.

The exported.write_user_data calls engine.writeUI, which, 
in turn, spams the "to_user_hook". Then your hook catches 
the spammed call and calls the exported.write_user_data, 
which calls the engine.writeUI, which in turn, etc. etc.

To Will: is there any cause why the engine.writeUI calls 
the UI module directly, and doesn't shedule the call via 
it's event queue? At least, the client won't hang.

By the way, using the event queue would allow to remove 
all the synchronization stuff from the engine.writeUI. So, 
instead of

     self._ui_lock.acquire(1)
     try:
       exported.hook_spam("to_user_hook", {"message": 
text})
     finally:
       self._ui_lock.release()


it will be something like that:

     self._enqueue(event.SpamEvent("to_user_hook", 
{"message": text}))

and that's all.

>In load() I register...
>
>exported.hook_register("to_user_hook", handle_to_user)
>
>In handle_to_user(args) all these freeze...
>
>exported.write_message('...')
>exported.write_user_data('n')
>exported.write_user_data('n',msg.session)
>exported.write_user_data('n\n')
>exported.write_user_data('n\n',msg.session)

--
Eugene
---
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