2 * Server-side async I/O support
4 * Copyright (C) 2007 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
27 #define WIN32_NO_STATUS
37 struct object obj; /* object header */
38 struct thread *thread; /* owning thread */
39 struct list queue_entry; /* entry in async queue list */
40 struct async_queue *queue; /* queue containing this async */
41 struct timeout_user *timeout;
42 unsigned int timeout_status; /* status to report upon timeout */
44 async_data_t data; /* data for async I/O call */
47 static void async_dump( struct object *obj, int verbose );
48 static void async_destroy( struct object *obj );
50 static const struct object_ops async_ops =
52 sizeof(struct async), /* size */
53 async_dump, /* dump */
54 no_add_queue, /* add_queue */
55 NULL, /* remove_queue */
58 no_signal, /* signal */
59 no_get_fd, /* get_fd */
60 no_map_access, /* map_access */
61 no_lookup_name, /* lookup_name */
62 no_open_file, /* open_file */
63 no_close_handle, /* close_handle */
64 async_destroy /* destroy */
70 struct object obj; /* object header */
71 struct fd *fd; /* file descriptor owning this queue */
72 struct list queue; /* queue of async objects */
75 static void async_queue_dump( struct object *obj, int verbose );
77 static const struct object_ops async_queue_ops =
79 sizeof(struct async_queue), /* size */
80 async_queue_dump, /* dump */
81 no_add_queue, /* add_queue */
82 NULL, /* remove_queue */
85 no_signal, /* signal */
86 no_get_fd, /* get_fd */
87 no_map_access, /* map_access */
88 no_lookup_name, /* lookup_name */
89 no_open_file, /* open_file */
90 no_close_handle, /* close_handle */
91 no_destroy /* destroy */
95 static void async_dump( struct object *obj, int verbose )
97 struct async *async = (struct async *)obj;
98 assert( obj->ops == &async_ops );
99 fprintf( stderr, "Async thread=%p\n", async->thread );
102 static void async_destroy( struct object *obj )
104 struct async *async = (struct async *)obj;
105 assert( obj->ops == &async_ops );
107 if (async->timeout) remove_timeout_user( async->timeout );
108 if (async->event) release_object( async->event );
109 release_object( async->queue );
111 release_object( async->thread );
114 static void async_queue_dump( struct object *obj, int verbose )
116 struct async_queue *async_queue = (struct async_queue *)obj;
117 assert( obj->ops == &async_queue_ops );
118 fprintf( stderr, "Async queue fd=%p\n", async_queue->fd );
121 /* notifies client thread of new status of its async request */
122 /* destroys the server side of it */
123 static void async_terminate( struct async *async, unsigned int status )
127 memset( &data, 0, sizeof(data) );
128 data.type = APC_ASYNC_IO;
129 data.async_io.func = async->data.callback;
130 data.async_io.user = async->data.arg;
131 data.async_io.sb = async->data.iosb;
132 data.async_io.status = status;
133 thread_queue_apc( async->thread, &async->obj, &data );
135 if (async->timeout) remove_timeout_user( async->timeout );
136 async->timeout = NULL;
137 list_remove( &async->queue_entry );
138 release_object( async );
141 /* callback for timeout on an async request */
142 static void async_timeout( void *private )
144 struct async *async = private;
146 async->timeout = NULL;
147 async_terminate( async, async->timeout_status );
150 /* create a new async queue for a given fd */
151 struct async_queue *create_async_queue( struct fd *fd )
153 struct async_queue *queue = alloc_object( &async_queue_ops );
158 list_init( &queue->queue );
163 /* free an async queue, cancelling all async operations */
164 void free_async_queue( struct async_queue *queue )
168 async_wake_up( queue, STATUS_HANDLES_CLOSED );
169 release_object( queue );
172 /* create an async on a given queue of a fd */
173 struct async *create_async( struct thread *thread, struct async_queue *queue, const async_data_t *data )
175 struct event *event = NULL;
178 if (data->event && !(event = get_event_obj( thread->process, data->event, EVENT_MODIFY_STATE )))
181 if (!(async = alloc_object( &async_ops )))
183 if (event) release_object( event );
187 async->thread = (struct thread *)grab_object( thread );
188 async->event = event;
190 async->timeout = NULL;
191 async->queue = (struct async_queue *)grab_object( queue );
193 list_add_tail( &queue->queue, &async->queue_entry );
194 grab_object( async );
196 if (queue->fd) set_fd_signaled( queue->fd, 0 );
197 if (event) reset_event( event );
201 /* set the timeout of an async operation */
202 void async_set_timeout( struct async *async, const struct timeval *timeout, unsigned int status )
204 if (async->timeout) remove_timeout_user( async->timeout );
205 if (timeout) async->timeout = add_timeout_user( timeout, async_timeout, async );
206 else async->timeout = NULL;
207 async->timeout_status = status;
210 /* store the result of the client-side async callback */
211 void async_set_result( struct object *obj, unsigned int status )
213 struct async *async = (struct async *)obj;
215 if (obj->ops != &async_ops) return; /* in case the client messed up the APC results */
217 if (status == STATUS_PENDING)
219 /* FIXME: restart the async operation */
226 data.type = APC_USER;
227 data.user.func = async->data.apc;
228 data.user.args[0] = (unsigned long)async->data.apc_arg;
229 data.user.args[1] = (unsigned long)async->data.iosb;
230 data.user.args[2] = 0;
231 thread_queue_apc( async->thread, NULL, &data );
233 if (async->event) set_event( async->event );
234 else if (async->queue->fd) set_fd_signaled( async->queue->fd, 1 );
238 /* check if an async operation is waiting to be alerted */
239 int async_waiting( struct async_queue *queue )
241 return queue && !list_empty( &queue->queue );
244 /* wake up async operations on the queue */
245 void async_wake_up( struct async_queue *queue, unsigned int status )
247 struct list *ptr, *next;
251 LIST_FOR_EACH_SAFE( ptr, next, &queue->queue )
253 struct async *async = LIST_ENTRY( ptr, struct async, queue_entry );
254 async_terminate( async, status );
255 if (status == STATUS_ALERTED) break; /* only wake up the first one */