msdaps: Add a stub rowset proxy object.
[wine/hramrach.git] / server / async.c
blob73cd76de3e15e55648a5f83e8cc2aa3c8862bff6
1 /*
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
21 #include <assert.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <stdarg.h>
26 #include "ntstatus.h"
27 #define WIN32_NO_STATUS
28 #include "windef.h"
29 #include "winternl.h"
31 #include "object.h"
32 #include "file.h"
33 #include "request.h"
35 struct async
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 unsigned int status; /* current status */
42 struct timeout_user *timeout;
43 unsigned int timeout_status; /* status to report upon timeout */
44 struct event *event;
45 struct completion *completion;
46 apc_param_t comp_key;
47 async_data_t data; /* data for async I/O call */
50 static void async_dump( struct object *obj, int verbose );
51 static void async_destroy( struct object *obj );
53 static const struct object_ops async_ops =
55 sizeof(struct async), /* size */
56 async_dump, /* dump */
57 no_get_type, /* get_type */
58 no_add_queue, /* add_queue */
59 NULL, /* remove_queue */
60 NULL, /* signaled */
61 NULL, /* satisfied */
62 no_signal, /* signal */
63 no_get_fd, /* get_fd */
64 no_map_access, /* map_access */
65 default_get_sd, /* get_sd */
66 default_set_sd, /* set_sd */
67 no_lookup_name, /* lookup_name */
68 no_open_file, /* open_file */
69 no_close_handle, /* close_handle */
70 async_destroy /* destroy */
74 struct async_queue
76 struct object obj; /* object header */
77 struct fd *fd; /* file descriptor owning this queue */
78 struct list queue; /* queue of async objects */
81 static void async_queue_dump( struct object *obj, int verbose );
83 static const struct object_ops async_queue_ops =
85 sizeof(struct async_queue), /* size */
86 async_queue_dump, /* dump */
87 no_get_type, /* get_type */
88 no_add_queue, /* add_queue */
89 NULL, /* remove_queue */
90 NULL, /* signaled */
91 NULL, /* satisfied */
92 no_signal, /* signal */
93 no_get_fd, /* get_fd */
94 no_map_access, /* map_access */
95 default_get_sd, /* get_sd */
96 default_set_sd, /* set_sd */
97 no_lookup_name, /* lookup_name */
98 no_open_file, /* open_file */
99 no_close_handle, /* close_handle */
100 no_destroy /* destroy */
104 static inline void async_reselect( struct async *async )
106 if (async->queue->fd) fd_reselect_async( async->queue->fd, async->queue );
109 static void async_dump( struct object *obj, int verbose )
111 struct async *async = (struct async *)obj;
112 assert( obj->ops == &async_ops );
113 fprintf( stderr, "Async thread=%p\n", async->thread );
116 static void async_destroy( struct object *obj )
118 struct async *async = (struct async *)obj;
119 assert( obj->ops == &async_ops );
121 list_remove( &async->queue_entry );
122 async_reselect( async );
124 if (async->timeout) remove_timeout_user( async->timeout );
125 if (async->event) release_object( async->event );
126 if (async->completion) release_object( async->completion );
127 release_object( async->queue );
128 release_object( async->thread );
131 static void async_queue_dump( struct object *obj, int verbose )
133 struct async_queue *async_queue = (struct async_queue *)obj;
134 assert( obj->ops == &async_queue_ops );
135 fprintf( stderr, "Async queue fd=%p\n", async_queue->fd );
138 /* notifies client thread of new status of its async request */
139 void async_terminate( struct async *async, unsigned int status )
141 apc_call_t data;
143 assert( status != STATUS_PENDING );
145 if (async->status != STATUS_PENDING)
147 /* already terminated, just update status */
148 async->status = status;
149 return;
152 memset( &data, 0, sizeof(data) );
153 data.type = APC_ASYNC_IO;
154 data.async_io.func = async->data.callback;
155 data.async_io.user = async->data.arg;
156 data.async_io.sb = async->data.iosb;
157 data.async_io.status = status;
158 thread_queue_apc( async->thread, &async->obj, &data );
159 async->status = status;
160 async_reselect( async );
161 release_object( async ); /* so that it gets destroyed when the async is done */
164 /* callback for timeout on an async request */
165 static void async_timeout( void *private )
167 struct async *async = private;
169 async->timeout = NULL;
170 async_terminate( async, async->timeout_status );
173 /* create a new async queue for a given fd */
174 struct async_queue *create_async_queue( struct fd *fd )
176 struct async_queue *queue = alloc_object( &async_queue_ops );
178 if (queue)
180 queue->fd = fd;
181 list_init( &queue->queue );
183 return queue;
186 /* free an async queue, cancelling all async operations */
187 void free_async_queue( struct async_queue *queue )
189 if (!queue) return;
190 queue->fd = NULL;
191 async_wake_up( queue, STATUS_HANDLES_CLOSED );
192 release_object( queue );
195 /* create an async on a given queue of a fd */
196 struct async *create_async( struct thread *thread, struct async_queue *queue, const async_data_t *data )
198 struct event *event = NULL;
199 struct async *async;
201 if (data->event && !(event = get_event_obj( thread->process, data->event, EVENT_MODIFY_STATE )))
202 return NULL;
204 if (!(async = alloc_object( &async_ops )))
206 if (event) release_object( event );
207 return NULL;
210 async->thread = (struct thread *)grab_object( thread );
211 async->event = event;
212 async->status = STATUS_PENDING;
213 async->data = *data;
214 async->timeout = NULL;
215 async->queue = (struct async_queue *)grab_object( queue );
216 async->completion = NULL;
217 if (queue->fd) async->completion = fd_get_completion( queue->fd, &async->comp_key );
219 list_add_tail( &queue->queue, &async->queue_entry );
220 grab_object( async );
222 if (queue->fd) set_fd_signaled( queue->fd, 0 );
223 if (event) reset_event( event );
224 return async;
227 /* set the timeout of an async operation */
228 void async_set_timeout( struct async *async, timeout_t timeout, unsigned int status )
230 if (async->timeout) remove_timeout_user( async->timeout );
231 if (timeout != TIMEOUT_INFINITE) async->timeout = add_timeout_user( timeout, async_timeout, async );
232 else async->timeout = NULL;
233 async->timeout_status = status;
236 /* store the result of the client-side async callback */
237 void async_set_result( struct object *obj, unsigned int status, unsigned int total, client_ptr_t apc )
239 struct async *async = (struct async *)obj;
241 if (obj->ops != &async_ops) return; /* in case the client messed up the APC results */
243 assert( async->status != STATUS_PENDING ); /* it must have been woken up if we get a result */
245 if (status == STATUS_PENDING) /* restart it */
247 status = async->status;
248 async->status = STATUS_PENDING;
249 grab_object( async );
251 if (status != STATUS_ALERTED) /* it was terminated in the meantime */
252 async_terminate( async, status );
253 else
254 async_reselect( async );
256 else
258 if (async->timeout) remove_timeout_user( async->timeout );
259 async->timeout = NULL;
260 async->status = status;
261 if (async->completion && async->data.cvalue)
262 add_completion( async->completion, async->comp_key, async->data.cvalue, status, total );
263 if (apc)
265 apc_call_t data;
266 memset( &data, 0, sizeof(data) );
267 data.type = APC_USER;
268 data.user.func = apc;
269 data.user.args[0] = async->data.arg;
270 data.user.args[1] = async->data.iosb;
271 data.user.args[2] = 0;
272 thread_queue_apc( async->thread, NULL, &data );
274 if (async->event) set_event( async->event );
275 else if (async->queue->fd) set_fd_signaled( async->queue->fd, 1 );
279 /* check if an async operation is waiting to be alerted */
280 int async_waiting( struct async_queue *queue )
282 struct list *ptr;
283 struct async *async;
285 if (!queue) return 0;
286 if (!(ptr = list_head( &queue->queue ))) return 0;
287 async = LIST_ENTRY( ptr, struct async, queue_entry );
288 return async->status == STATUS_PENDING;
291 int async_wake_up_by( struct async_queue *queue, struct process *process,
292 struct thread *thread, client_ptr_t iosb, unsigned int status )
294 struct list *ptr, *next;
295 int woken = 0;
297 if (!queue || (!process && !thread && !iosb)) return 0;
299 LIST_FOR_EACH_SAFE( ptr, next, &queue->queue )
301 struct async *async = LIST_ENTRY( ptr, struct async, queue_entry );
302 if ( (!process || async->thread->process == process) &&
303 (!thread || async->thread == thread) &&
304 (!iosb || async->data.iosb == iosb) )
306 async_terminate( async, status );
307 woken++;
310 return woken;
313 /* wake up async operations on the queue */
314 void async_wake_up( struct async_queue *queue, unsigned int status )
316 struct list *ptr, *next;
318 if (!queue) return;
320 LIST_FOR_EACH_SAFE( ptr, next, &queue->queue )
322 struct async *async = LIST_ENTRY( ptr, struct async, queue_entry );
323 async_terminate( async, status );
324 if (status == STATUS_ALERTED) break; /* only wake up the first one */