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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* As a special exception, if you link this library with other files,
  22    some of which are compiled with GCC, to produce an executable,
  23    this library does not by itself cause the resulting executable
  24    to be covered by the GNU General Public License.
  25    This exception does not however invalidate any other reasons why
  26    the executable file might be covered by the GNU General Public License.  */
  27
  28 #include "rtltypes.h"
  29 #include "rts.h"
  30
  31 /*
  32  * function __continue
  33  *
  34  * parameters:
  35  *     evaddr     pointer to Eventlocation
  36  *     filename   source file name where function gets called
  37  *     lineno     linenumber in source file
  38  *
  39  * returns:
  40  *     void
  41  *
  42  * exceptions:
  43  *     none
  44  *
  45  * abstract:
  46  *     implement the CHILL CONTINUE action.
  47  */
  48
  49 void
  50 __continue (evaddr, filename, lineno)
  51      Event_Queue   **evaddr;
  52      char           *filename;
  53      int             lineno;
  54 {
  55   Event_Queue  *ev = *evaddr;
  56   Event_Queue  *wrk;
  57
  58   if (ev == 0)
  59     /* nothing to do */
  60     return;
  61
  62   /* search for 1st one is not already continued */
  63   while (ev && ev->is_continued)
  64     ev = ev->forward;
  65   if (!ev)
  66     /* all have been continued in that queue, do nothing */
  67     return;
  68
  69   wrk = ev->startlist;
  70   while (wrk)
  71     {
  72       Event_Queue     *tmp = (Event_Queue *)wrk->listhead;
  73
  74       while (tmp->forward != wrk)
  75         tmp = tmp->forward;
  76       tmp->forward = wrk->forward;
  77       wrk = wrk->chain;
  78     }
  79
  80   /* so far so good, continue this one */
  81   ev->is_continued = 1;
  82   ev->who_continued = THIS;
  83
  84   /* tell the runtime system to activate the process */
  85   __continue_that (ev->this, ev->priority, filename, lineno);
  86 }
  87
  88 /* force function print_event to be linked */
  89 extern void __print_event ();
  90 static EntryPoint pev = __print_event;