From 2ec10b952b40d287037a50387a8b66d9ccc5124b Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Thu, 5 Jul 2012 17:16:22 +0200 Subject: [PATCH] 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 Signed-off-by: Avi Kivity --- event_notifier.c | 7 +++++++ event_notifier.h | 1 + 2 files changed, 8 insertions(+) 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 *);