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queues.v
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1992-05-19
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/*
C BASED FORTH-83 MULTI-TASKING KERNEL: DOUBLE LINKED LIST
Copyright (C) 1990 by Mikael R.K. Patel
Computer Aided Design Laboratory (CADLAB)
Department of Computer and Information Science
Linkoping University
S-581 83 LINKOPING
SWEDEN
Email: mip@ida.liu.se
Started on: 12 April 1990
Last updated on: 26 June 1990
Dependencies:
(cc) kernel.c, kernel.h
Description:
Double linked list (queues) extension vocabulary for the tile
forth multi-tasking kernel.
Copying:
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
VOID doqemptyqueue()
{
compare(== ((INT32) tos.QUEUE -> succ), INT32);
}
NORMAL_CODE(qemptyqueue, forth, "?empty-queue", doqemptyqueue);
VOID doenqueue()
{
register QUEUE t, q;
q = spop(QUEUE);
t = spop(QUEUE);
t -> pred = q -> pred;
t -> succ = q;
q -> pred -> succ = t;
q -> pred = t;
}
NORMAL_CODE(enqueue, qemptyqueue, "enqueue", doenqueue);
VOID dodequeue()
{
register QUEUE t;
t = spop(QUEUE);
t -> succ -> pred = t -> pred;
t -> pred -> succ = t -> succ;
t -> succ = t -> pred = t;
}
NORMAL_CODE(dequeue, enqueue, "dequeue", dodequeue);