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authorAnthony Liguori <aliguori@us.ibm.com>2010-03-09 13:16:14 -0600
committerAnthony Liguori <aliguori@us.ibm.com>2010-03-19 15:27:32 -0500
commitd1e70c5e6d1472856c52969301247fe8c3c8389d (patch)
treecf8518783ecd1737ea4eb00ac1be7c7ed4d048f0 /notify.h
parentddbda4323e2bdc7cb3925b0f4080f9eb836a09e8 (diff)
Add support for generic notifier lists
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
Diffstat (limited to 'notify.h')
-rw-r--r--notify.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/notify.h b/notify.h
new file mode 100644
index 0000000000..b40522f582
--- /dev/null
+++ b/notify.h
@@ -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