[Bayonne-devel] RE: [Bayonne-dialogic] bayonne locks a line in state "step"

[Julien Chavanton]

Interresting , this should be posted to bayonne-devel, our fellow working with 
ccscript 
should be aware about this.
 
Thanks,
Julien
 

        -----Original Message----- 
        From: infos chez fdrconseil [mailto:address@hidden 
        Sent: Sat 2/19/2005 09:43 AM 
        To: infos chez fdrconseil; Julien Chavanton; Jonathan Wolfe; 
address@hidden 
        Cc: David Sugar 
        Subject: Re: [Bayonne-dialogic] bayonne locks a line in state "step"
        
        

        The script given as an exploit to reproduce the problem 
        (bugSortantRedem.scr)
        has a bug in it.
        Let me explain and let's learn something :
        
        Remeber the following lines in the script :
        
                start.group did bugSortantRedem::Calling
                goto ::Waiting
        
        
        The script starts a new thread (start.group ....) and then "goto" a 
block
        where we are waiting for an event coming from the started child.
        Under some circumstances (heavy load), the child is running faster than 
the
        parent and the event is sent by the child BEFORE the parent is going to
        the ::Waiting block.
        The strange thing is that [starting a thread + Dialing + reporting an 
        event to the parent]
        is executed faster than a simple "goto"... but it happens !!
        
        Adding the following code in the ::Loop block fixes the problem :
        
        ^event
                if %session.eventsendermsg == "OK"
                then
                        goto ::WaitForEnd
                else
                        goto ::Loop
                endif
        
        
        
        The lesson is : when you are waiting for an event, never think it'll be 
        raised LATER.
        
        FdR (*#)
        
        
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