external/bsd/ntp/dist/lib/isc/ondestroy.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: ondestroy.c,v 1.16 2007/06/19 23:47:17 tbox Exp */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <stddef.h>
  27
  28 #include <isc/event.h>
  29 #include <isc/magic.h>
  30 #include <isc/ondestroy.h>
  31 #include <isc/task.h>
  32 #include <isc/util.h>
  33
  34 #define ONDESTROY_MAGIC         ISC_MAGIC('D', 'e', 'S', 't')
  35 #define VALID_ONDESTROY(s)      ISC_MAGIC_VALID(s, ONDESTROY_MAGIC)
  36
  37 void
  38 isc_ondestroy_init(isc_ondestroy_t *ondest) {
  39         ondest->magic = ONDESTROY_MAGIC;
  40         ISC_LIST_INIT(ondest->events);
  41 }
  42
  43 isc_result_t
  44 isc_ondestroy_register(isc_ondestroy_t *ondest, isc_task_t *task,
  45                        isc_event_t **eventp)
  46 {
  47         isc_event_t *theevent;
  48         isc_task_t *thetask = NULL;
  49
  50         REQUIRE(VALID_ONDESTROY(ondest));
  51         REQUIRE(task != NULL);
  52         REQUIRE(eventp != NULL);
  53
  54         theevent = *eventp;
  55
  56         REQUIRE(theevent != NULL);
  57
  58         isc_task_attach(task, &thetask);
  59
  60         theevent->ev_sender = thetask;
  61
  62         ISC_LIST_APPEND(ondest->events, theevent, ev_link);
  63
  64         return (ISC_R_SUCCESS);
  65 }
  66
  67 void
  68 isc_ondestroy_notify(isc_ondestroy_t *ondest, void *sender) {
  69         isc_event_t *eventp;
  70         isc_task_t *task;
  71
  72         REQUIRE(VALID_ONDESTROY(ondest));
  73
  74         eventp = ISC_LIST_HEAD(ondest->events);
  75         while (eventp != NULL) {
  76                 ISC_LIST_UNLINK(ondest->events, eventp, ev_link);
  77
  78                 task = eventp->ev_sender;
  79                 eventp->ev_sender = sender;
  80
  81                 isc_task_sendanddetach(&task, &eventp);
  82
  83                 eventp = ISC_LIST_HEAD(ondest->events);
  84         }
  85 }
  86
  87