qemu/event_notifier.h
Paolo Bonzini d0cc2fbfa6 event_notifier: enable it to use pipes
This takes the eventfd emulation code from the main loop.  When the
EventNotifier is used for the main loop too, we need this compatibility
code.

Without CONFIG_EVENTFD, event_notifier_get_fd is only usable for the
"read" side of the notifier, for example to set a select() handler.

The return value of event_notifier_set changes to the cleaner 0/-errno.
No caller is actually checking the return value.

Reviewed-by: Anthony Liguori <anthony@codemonkey.ws>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-30 09:30:52 +01:00

47 lines
994 B
C

/*
* event notifier support
*
* Copyright Red Hat, Inc. 2010
*
* Authors:
* Michael S. Tsirkin <mst@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef QEMU_EVENT_NOTIFIER_H
#define QEMU_EVENT_NOTIFIER_H
#include "qemu-common.h"
#ifdef _WIN32
#include <windows.h>
#endif
struct EventNotifier {
#ifdef _WIN32
HANDLE event;
#else
int rfd;
int wfd;
#endif
};
typedef void EventNotifierHandler(EventNotifier *);
int event_notifier_init(EventNotifier *, int active);
void event_notifier_cleanup(EventNotifier *);
int event_notifier_set(EventNotifier *);
int event_notifier_test_and_clear(EventNotifier *);
int event_notifier_set_handler(EventNotifier *, EventNotifierHandler *);
#ifdef CONFIG_POSIX
void event_notifier_init_fd(EventNotifier *, int fd);
int event_notifier_get_fd(EventNotifier *);
#else
HANDLE event_notifier_get_handle(EventNotifier *);
#endif
#endif