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@xxxxxxxxxx>
---
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
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