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event_notifier: add event_notifier_set

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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>
This commit is contained in:
Paolo Bonzini 2012-07-05 17:16:22 +02:00 committed by Avi Kivity
parent 5d62c43a17
commit 2ec10b952b
2 changed files with 8 additions and 0 deletions
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7
event_notifier.c
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@ -38,6 +38,13 @@ int event_notifier_get_fd(EventNotifier *e)
return e->fd; 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) int event_notifier_test_and_clear(EventNotifier *e)
{ {
uint64_t value; uint64_t value;

1
event_notifier.h
View File

@ -22,6 +22,7 @@ struct EventNotifier {
int event_notifier_init(EventNotifier *, int active); int event_notifier_init(EventNotifier *, int active);
void event_notifier_cleanup(EventNotifier *); void event_notifier_cleanup(EventNotifier *);
int event_notifier_get_fd(EventNotifier *); int event_notifier_get_fd(EventNotifier *);
int event_notifier_set(EventNotifier *);
int event_notifier_test_and_clear(EventNotifier *); int event_notifier_test_and_clear(EventNotifier *);
int event_notifier_test(EventNotifier *); int event_notifier_test(EventNotifier *);