src/event.cc

   1
   2 /*
   3  * $Id: event.cc,v 1.9 1997/11/05 05:29:23 wessels Exp $
   4  *
   5  * DEBUG: section 41    Event Processing
   6  * AUTHOR: Henrik Nordstrom
   7  *
   8  * SQUID Internet Object Cache  http://squid.nlanr.net/Squid/
   9  * --------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from the
  12  *  Internet community.  Development is led by Duane Wessels of the
  13  *  National Laboratory for Applied Network Research and funded by
  14  *  the National Science Foundation.
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License as published by
  18  *  the Free Software Foundation; either version 2 of the License, or
  19  *  (at your option) any later version.
  20  *
  21  *  This program is distributed in the hope that it will be useful,
  22  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *  GNU General Public License for more details.
  25  *
  26  *  You should have received a copy of the GNU General Public License
  27  *  along with this program; if not, write to the Free Software
  28  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  *
  30  */
  31
  32 #include "squid.h"
  33
  34 /* The list of event processes */
  35 struct ev_entry {
  36     EVH *func;
  37     void *arg;
  38     const char *name;
  39     time_t when;
  40     struct ev_entry *next;
  41 };
  42
  43 static struct ev_entry *tasks = NULL;
  44
  45 void
  46 eventAdd(const char *name, EVH * func, void *arg, time_t when)
  47 {
  48     struct ev_entry *event = xcalloc(1, sizeof(struct ev_entry));
  49     struct ev_entry **E;
  50     event->func = func;
  51     event->arg = arg;
  52     event->name = name;
  53     event->when = squid_curtime + when;
  54     debug(41, 7) ("eventAdd: Adding '%s', in %d seconds\n", name, when);
  55     /* Insert after the last event with the same or earlier time */
  56     for (E = &tasks; *E; E = &(*E)->next) {
  57         if ((*E)->when > event->when)
  58             break;
  59     }
  60     event->next = *E;
  61     *E = event;
  62 }
  63
  64 void
  65 eventDelete(EVH * func, void *arg)
  66 {
  67     struct ev_entry **E;
  68     struct ev_entry *event;
  69     for (E = &tasks; (event = *E) != NULL; E = &(*E)->next) {
  70         if (event->func != func)
  71             continue;
  72         if (event->arg != arg)
  73             continue;
  74         *E = event->next;
  75         xfree(event);
  76         return;
  77     }
  78     debug_trap("eventDelete: event not found");
  79 }
  80
  81 void
  82 eventRun(void)
  83 {
  84     struct ev_entry *event = NULL;
  85     EVH *func;
  86     void *arg;
  87     if ((event = tasks) == NULL)
  88         return;
  89     if (event->when > squid_curtime)
  90         return;
  91     debug(41, 7) ("eventRun: Running '%s'\n", event->name);
  92     func = event->func;
  93     arg = event->arg;
  94     event->func = NULL;
  95     event->arg = NULL;
  96     tasks = event->next;
  97     safe_free(event);
  98     func(arg);
  99 }
 100
 101 time_t
 102 eventNextTime(void)
 103 {
 104     if (!tasks)
 105         return (time_t) 10;
 106     return tasks->when - squid_curtime;
 107 }