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Add support for generic notifier lists

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Notifiers are data-less callbacks and a notifier list is a list of registered
notifiers that all are interested in a particular event.

We'll use this in a few patches to implement mouse change notification.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
v1 -> v2
 - Do not do memory allocations by placing list nodes in notifier
This commit is contained in:
Anthony Liguori 2010-03-09 13:16:14 -06:00
parent ddbda4323e
commit d1e70c5e6d
3 changed files with 83 additions and 0 deletions
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43
notify.h Normal file
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@ -0,0 +1,43 @@
/*
* Notifier lists
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#ifndef QEMU_NOTIFY_H
#define QEMU_NOTIFY_H
#include "qemu-queue.h"
typedef struct Notifier Notifier;
struct Notifier
{
void (*notify)(Notifier *notifier);
QTAILQ_ENTRY(Notifier) node;
};
typedef struct NotifierList
{
QTAILQ_HEAD(, Notifier) notifiers;
} NotifierList;
#define NOTIFIER_LIST_INITIALIZER(head) \
{ QTAILQ_HEAD_INITIALIZER((head).notifiers) }
void notifier_list_init(NotifierList *list);
void notifier_list_add(NotifierList *list, Notifier *notifier);
void notifier_list_remove(NotifierList *list, Notifier *notifier);
void notifier_list_notify(NotifierList *list);
#endif