1 /* 2 * event notifier support 3 * 4 * Copyright Red Hat, Inc. 2010 5 * 6 * Authors: 7 * Michael S. Tsirkin <mst@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or later. 10 * See the COPYING file in the top-level directory. 11 */ 12 13 #include "qemu-common.h" 14 #include "qemu/event_notifier.h" 15 #include "qemu/main-loop.h" 16 17 int event_notifier_init(EventNotifier *e, int active) 18 { 19 e->event = CreateEvent(NULL, TRUE, FALSE, NULL); 20 assert(e->event); 21 return 0; 22 } 23 24 void event_notifier_cleanup(EventNotifier *e) 25 { 26 CloseHandle(e->event); 27 } 28 29 HANDLE event_notifier_get_handle(EventNotifier *e) 30 { 31 return e->event; 32 } 33 34 int event_notifier_set_handler(EventNotifier *e, 35 EventNotifierHandler *handler) 36 { 37 if (handler) { 38 return qemu_add_wait_object(e->event, (IOHandler *)handler, e); 39 } else { 40 qemu_del_wait_object(e->event, (IOHandler *)handler, e); 41 return 0; 42 } 43 } 44 45 int event_notifier_set(EventNotifier *e) 46 { 47 SetEvent(e->event); 48 return 0; 49 } 50 51 int event_notifier_test_and_clear(EventNotifier *e) 52 { 53 int ret = WaitForSingleObject(e->event, 0); 54 if (ret == WAIT_OBJECT_0) { 55 ResetEvent(e->event); 56 return true; 57 } 58 return false; 59 } 60