From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 5 Jul 2012 15:16:22 +0000 (+0200)
Subject: event_notifier: add event_notifier_set
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2ec10b952b40d287037a50387a8b66d9ccc5124b;p=qemu.git

event_notifier: add event_notifier_set

EventNotifier right now cannot be used as an inter-thread communication
primitive.  It only works if something else (the kernel) sets the eventfd.
Add a primitive to signal an EventNotifier that another thread is waiting
on.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/event_notifier.c b/event_notifier.c
index 0b829813d3..2b210f4b44 100644
--- a/event_notifier.c
+++ b/event_notifier.c
@@ -38,6 +38,13 @@ int event_notifier_get_fd(EventNotifier *e)
     return e->fd;
 }
 
+int event_notifier_set(EventNotifier *e)
+{
+    uint64_t value = 1;
+    int r = write(e->fd, &value, sizeof(value));
+    return r == sizeof(value);
+}
+
 int event_notifier_test_and_clear(EventNotifier *e)
 {
     uint64_t value;
diff --git a/event_notifier.h b/event_notifier.h
index 886222cb36..efca852d10 100644
--- a/event_notifier.h
+++ b/event_notifier.h
@@ -22,6 +22,7 @@ struct EventNotifier {
 int event_notifier_init(EventNotifier *, int active);
 void event_notifier_cleanup(EventNotifier *);
 int event_notifier_get_fd(EventNotifier *);
+int event_notifier_set(EventNotifier *);
 int event_notifier_test_and_clear(EventNotifier *);
 int event_notifier_test(EventNotifier *);