$CLRAST

   Clears the "AST active" status.

   This enables delivery of asynchronous system traps (ASTs) for the
   access mode from which the service call was issued, while an AST
   routine is active.

                                  NOTE

      The explicit use of $CLRAST is strongly discouraged, as
      it complicates synchronization issues and may lead to the
      unbounded consumption of stack space.

   Normally, AST delivery for a particular access mode is deferred
   while an AST routine is executing in that access mode. When the
   AST routine returns, an implicit call is made to $CLRAST to re-
   enable AST delivery.

   Explicitly calling $CLRAST within an AST routine allows the
   delivery of ASTs for the access mode from which the service call
   was issued, prior to completion of the active AST routine.

   Format

     SYS$CLRAST
 

Additional information available:

Arguments