util/notify.c

   1 /*
   2  * Notifier lists
   3  *
   4  * Copyright IBM, Corp. 2010
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "qemu/osdep.h"
  17 #include "qemu-common.h"
  18 #include "qemu/notify.h"
  19
  20 void notifier_list_init(NotifierList *list)
  21 {
  22     QLIST_INIT(&list->notifiers);
  23 }
  24
  25 void notifier_list_add(NotifierList *list, Notifier *notifier)
  26 {
  27     QLIST_INSERT_HEAD(&list->notifiers, notifier, node);
  28 }
  29
  30 void notifier_remove(Notifier *notifier)
  31 {
  32     QLIST_REMOVE(notifier, node);
  33 }
  34
  35 void notifier_list_notify(NotifierList *list, void *data)
  36 {
  37     Notifier *notifier, *next;
  38
  39     QLIST_FOREACH_SAFE(notifier, &list->notifiers, node, next) {
  40         notifier->notify(notifier, data);
  41     }
  42 }
  43
  44 void notifier_with_return_list_init(NotifierWithReturnList *list)
  45 {
  46     QLIST_INIT(&list->notifiers);
  47 }
  48
  49 void notifier_with_return_list_add(NotifierWithReturnList *list,
  50                                    NotifierWithReturn *notifier)
  51 {
  52     QLIST_INSERT_HEAD(&list->notifiers, notifier, node);
  53 }
  54
  55 void notifier_with_return_remove(NotifierWithReturn *notifier)
  56 {
  57     QLIST_REMOVE(notifier, node);
  58 }
  59
  60 int notifier_with_return_list_notify(NotifierWithReturnList *list, void *data)
  61 {
  62     NotifierWithReturn *notifier, *next;
  63     int ret = 0;
  64
  65     QLIST_FOREACH_SAFE(notifier, &list->notifiers, node, next) {
  66         ret = notifier->notify(notifier, data);
  67         if (ret != 0) {
  68             break;
  69         }
  70     }
  71     return ret;
  72 }