From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:60314) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Smnnh-00015N-Le for qemu-devel@nongnu.org; Thu, 05 Jul 2012 11:17:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Smnnd-0001vo-Sq for qemu-devel@nongnu.org; Thu, 05 Jul 2012 11:17:01 -0400 Received: from mail-yx0-f173.google.com ([209.85.213.173]:42815) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Smnnd-0001vb-MH for qemu-devel@nongnu.org; Thu, 05 Jul 2012 11:16:57 -0400 Received: by yenl1 with SMTP id l1so8126175yen.4 for ; Thu, 05 Jul 2012 08:16:56 -0700 (PDT) Sender: Paolo Bonzini From: Paolo Bonzini Date: Thu, 5 Jul 2012 17:16:22 +0200 Message-Id: <1341501390-797-2-git-send-email-pbonzini@redhat.com> In-Reply-To: <1341501390-797-1-git-send-email-pbonzini@redhat.com> References: <1341501390-797-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH uq/master 1/9] event_notifier: add event_notifier_set List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kvm@vger.kernel.org, mst@redhat.com, jan.kiszka@siemens.com, mtosatti@redhat.com, avi@redhat.com, anthony.perard@citrix.com, stefano.stabellini@eu.citrix.com 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 --- event_notifier.c | 7 +++++++ event_notifier.h | 1 + 2 files changed, 8 insertions(+) diff --git a/event_notifier.c b/event_notifier.c index 0b82981..2b210f4 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 886222c..efca852 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 *); -- 1.7.10.2