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notifier: event notifier implementation

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event notifiers are slightly generalized eventfd descriptors. Current
implementation depends on eventfd because vhost is the only user, and
vhost depends on eventfd anyway, but a stub is provided for non-eventfd
case.

We'll be able to further generalize this when another user comes along
and we see how to best do this.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2010-03-17 13:07:58 +02:00 • committed by Anthony Liguori
parent ca82180603
commit 2292b33986
4 changed files with 80 additions and 0 deletions
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16
hw/event_notifier.h Normal file
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#ifndef QEMU_EVENT_NOTIFIER_H
#define QEMU_EVENT_NOTIFIER_H
#include "qemu-common.h"
struct EventNotifier {
int fd;
};
int event_notifier_init(EventNotifier *, int active);
void event_notifier_cleanup(EventNotifier *);
int event_notifier_get_fd(EventNotifier *);
int event_notifier_test_and_clear(EventNotifier *);
int event_notifier_test(EventNotifier *);
#endif