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\ Hypervisor Software File: timedrec.fth
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id: @(#)timedrec.fth 2.7 99/09/16
purpose: Network receive that will timeout after awhile
copyright: Copyright 1990-1997 Sun Microsystems, Inc.  All Rights Reserved

\ Implements a network receive that will timeout after a certain interval.

headerless

instance variable alarmtime

: set-timeout  ( interval -- )  get-msecs  +  alarmtime !  ;

: timeout?  ( -- flag )  get-msecs  alarmtime @ >=  ;

instance defer handle-broadcast-packet  ( pkt-addr pkt-len -- )    \ Fwd reference
' 2drop to handle-broadcast-packet

: multicast? ( -- flag)  *buffer @ c@ h# 01 and ;

: receive-ethernet-packet ( type -- [ pkt-adr pkt-len ] flag )
   begin
      receive dup 0>  if                                ( type len )
         *buffer @  active-struct !                     ( type len )
         over en-type be-w@ =  if                       ( type len )
            nip active-struct @ swap true exit
         else                                           ( type len )
            multicast?  if
               *buffer @ over handle-broadcast-packet
            then                                        ( type len )
         then                                           ( type len )
      then                                              ( type len )
      drop                                              ( type )
      timeout?                                          ( type flag )
   until                                                ( type )
   drop false                                           ( false )
;

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