Merge remote-tracking branch 'remotes/palmer/tags/riscv-for-master-4.1-sf0' into...

[qemu.git] / include / qemu / notify.h

diff --git a/include/qemu/notify.h b/include/qemu/notify.h
index 4e2e7f0ec4db0aa63c4e5450b7d64467b4cb76aa..a3d73e4bc7604905dd32aa5b0dc49e6aa207ea6b 100644 (file)
--- a/include/qemu/notify.h
+++ b/include/qemu/notify.h
@@ -40,4 +40,33 @@ void notifier_remove(Notifier *notifier);
 
 void notifier_list_notify(NotifierList *list, void *data);
 
+/* Same as Notifier but allows .notify() to return errors */
+typedef struct NotifierWithReturn NotifierWithReturn;
+
+struct NotifierWithReturn {
+    /**
+     * Return 0 on success (next notifier will be invoked), otherwise
+     * notifier_with_return_list_notify() will stop and return the value.
+     */
+    int (*notify)(NotifierWithReturn *notifier, void *data);
+    QLIST_ENTRY(NotifierWithReturn) node;
+};
+
+typedef struct NotifierWithReturnList {
+    QLIST_HEAD(, NotifierWithReturn) notifiers;
+} NotifierWithReturnList;
+
+#define NOTIFIER_WITH_RETURN_LIST_INITIALIZER(head) \
+    { QLIST_HEAD_INITIALIZER((head).notifiers) }
+
+void notifier_with_return_list_init(NotifierWithReturnList *list);
+
+void notifier_with_return_list_add(NotifierWithReturnList *list,
+                                   NotifierWithReturn *notifier);
+
+void notifier_with_return_remove(NotifierWithReturn *notifier);
+
+int notifier_with_return_list_notify(NotifierWithReturnList *list,
+                                     void *data);
+
 #endif