HP OpenVMS Systems

terminology: upcall vs callback?

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The Question is:

 
What is the difference between a "callback"
and an "upcall" ?
 
Thanks,
Raj Mohan
 
 

The Answer is :

 
  The context -- in DECthreads, an upcall is a callback used by OpenVMS
  to inform DECthreads that something "interesting" has happened.  In the
  more traditional OpenVMS context, callbacks are typically used to refer
  to user-written calls registered by users for certain events.
 
 

  

     

     
answer written or last revised on ( 9-NOV-1998 )
     
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