| PostgreSQL 7.4.22 Documentation | ||||
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   pg_on_connection_loss creates, changes, or
   cancels a request to execute a callback command if an unexpected
   loss of connection to the database occurs.  With a
   callbackCommand parameter, the request is
   established, or the command string of an already existing request
   is replaced.  With no callbackCommand parameter, a
   prior request is canceled.
  
   The callback command string is executed from the Tcl idle loop.
   That is the normal idle state of an application written with Tk.
   In non-Tk Tcl shells, you can execute update
   or vwait to cause the idle loop to be entered.