2 * Server-side support for async i/o operations
4 * Copyright (C) 1998 Alexandre Julliard
5 * Copyright (C) 2000 Mike McCormack
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
36 void destroy_async( struct async *async )
38 struct async_queue *aq = async->q;
40 /*fprintf(stderr,"destroyed async %p\n",async->overlapped); */
43 remove_timeout_user(async->timeout);
44 async->timeout = NULL;
47 async->prev->next = async->next;
49 aq->head = async->next;
52 async->next->prev = async->prev;
54 aq->tail = async->prev;
63 void async_notify(struct async *async, int status)
65 /* fprintf(stderr,"notifying %p!\n",async->overlapped); */
66 async->status = status;
67 thread_queue_apc(async->thread, NULL, async->func, APC_ASYNC, 1, 2, async->overlapped, status);
70 void destroy_async_queue( struct async_queue *q )
74 async_notify(q->head, STATUS_HANDLES_CLOSED);
75 destroy_async(q->head);
79 struct async *find_async(struct async_queue *q, struct thread *thread, void *overlapped)
83 /* fprintf(stderr,"find_async: %p\n",overlapped); */
88 for(async = q->head; async; async = async->next)
89 if((async->overlapped==overlapped) && (async->thread == thread))
95 void async_insert(struct async_queue *q, struct async *async)
98 async->prev = q->tail;
102 q->tail->next = async;
109 static void async_callback(void *private)
111 struct async *async = (struct async *)private;
113 /* fprintf(stderr,"%p timeout out\n",async->overlapped); */
114 async->timeout = NULL;
115 async_notify(async, STATUS_TIMEOUT);
116 destroy_async(async);
119 struct async *create_async(struct object *obj, struct thread *thread, void *func,
122 struct async *async = (struct async *) malloc(sizeof(struct async));
125 set_error(STATUS_NO_MEMORY);
130 async->thread = thread;
132 async->overlapped = overlapped;
136 async->status = STATUS_PENDING;
137 async->timeout = NULL;
142 void async_add_timeout(struct async *async, int timeout)
146 gettimeofday( &async->when, 0 );
147 add_timeout( &async->when, timeout );
148 async->timeout = add_timeout_user( &async->when, async_callback, async );
152 DECL_HANDLER(register_async)
156 if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL)) )
159 if(obj->ops->queue_async)
161 struct async_queue *q = obj->ops->queue_async(obj, NULL, req->type, 0);
164 async = find_async(q, current, req->overlapped);
165 if(req->status==STATUS_PENDING)
168 async = create_async(obj, current, req->func, req->overlapped);
172 async->status = req->status;
173 if(!obj->ops->queue_async(obj, async, req->type, req->count))
174 destroy_async(async);
180 destroy_async(async);
182 set_error(STATUS_INVALID_PARAMETER);
185 set_select_events(obj,obj->ops->get_poll_events(obj));
188 set_error(STATUS_INVALID_HANDLE);