libchill/continue.c

   1 /* Implement tasking-related runtime actions for CHILL.
   2    Copyright (C) 1992,1993 Free Software Foundation, Inc.
   3    Author: Wilfried Moser
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #include "rtltypes.h"
  30 #include "rts.h"
  31
  32 /*
  33  * function __continue
  34  *
  35  * parameters:
  36  *     evaddr     pointer to Eventlocation
  37  *     filename   source file name where function gets called
  38  *     lineno     linenumber in source file
  39  *
  40  * returns:
  41  *     void
  42  *
  43  * exceptions:
  44  *     none
  45  *
  46  * abstract:
  47  *     implement the CHILL CONTINUE action.
  48  */
  49
  50 void
  51 __continue (evaddr, filename, lineno)
  52      Event_Queue   **evaddr;
  53      char           *filename;
  54      int             lineno;
  55 {
  56   Event_Queue  *ev = *evaddr;
  57   Event_Queue  *wrk;
  58
  59   if (ev == 0)
  60     /* nothing to do */
  61     return;
  62
  63   /* search for 1st one is not already continued */
  64   while (ev && ev->is_continued)
  65     ev = ev->forward;
  66   if (!ev)
  67     /* all have been continued in that queue, do nothing */
  68     return;
  69
  70   wrk = ev->startlist;
  71   while (wrk)
  72     {
  73       Event_Queue     *tmp = (Event_Queue *)wrk->listhead;
  74
  75       while (tmp->forward != wrk)
  76         tmp = tmp->forward;
  77       tmp->forward = wrk->forward;
  78       wrk = wrk->chain;
  79     }
  80
  81   /* so far so good, continue this one */
  82   ev->is_continued = 1;
  83   ev->who_continued = THIS;
  84
  85   /* tell the runtime system to activate the process */
  86   __continue_that (ev->this, ev->priority, filename, lineno);
  87 }
  88
  89 /* force function print_event to be linked */
  90 extern void __print_event ();
  91 static EntryPoint pev = __print_event;