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08016dc38a
async requests (spotted by Andreas Mohr).
180 lines
4.8 KiB
C
180 lines
4.8 KiB
C
/*
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* Server-side support for async i/o operations
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*
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* Copyright (C) 1998 Alexandre Julliard
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* Copyright (C) 2000 Mike McCormack
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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#include "async.h"
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void destroy_async( struct async *async )
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{
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struct async_queue *aq = async->q;
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/*fprintf(stderr,"destroyed async %p\n",async->overlapped); */
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if(async->timeout)
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remove_timeout_user(async->timeout);
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async->timeout = NULL;
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if(async->prev)
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async->prev->next = async->next;
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else
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aq->head = async->next;
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if(async->next)
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async->next->prev = async->prev;
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else
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aq->tail = async->prev;
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async->q = NULL;
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async->next = NULL;
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async->prev = NULL;
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release_object( async->thread );
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free(async);
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}
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void async_notify(struct async *async, int status)
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{
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/* fprintf(stderr,"notifying %p!\n",async->overlapped); */
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async->status = status;
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thread_queue_apc(async->thread, NULL, NULL, APC_ASYNC_IO, 1, 2, async->overlapped, status);
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}
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void destroy_async_queue( struct async_queue *q )
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{
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while(q->head)
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{
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async_notify(q->head, STATUS_CANCELLED);
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destroy_async(q->head);
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}
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}
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struct async *find_async(struct async_queue *q, struct thread *thread, void *overlapped)
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{
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struct async *async;
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/* fprintf(stderr,"find_async: %p\n",overlapped); */
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if(!q)
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return NULL;
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for(async = q->head; async; async = async->next)
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if((async->overlapped==overlapped) && (async->thread == thread))
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return async;
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return NULL;
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}
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void async_insert(struct async_queue *q, struct async *async)
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{
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async->q = q;
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async->prev = q->tail;
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async->next = NULL;
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if(q->tail)
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q->tail->next = async;
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else
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q->head = async;
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q->tail = async;
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}
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static void async_callback(void *private)
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{
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struct async *async = (struct async *)private;
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/* fprintf(stderr,"%p timeout out\n",async->overlapped); */
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async->timeout = NULL;
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async_notify(async, STATUS_TIMEOUT);
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destroy_async(async);
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}
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struct async *create_async(struct object *obj, struct thread *thread,
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void *overlapped)
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{
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struct async *async = (struct async *) malloc(sizeof(struct async));
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if(!async)
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{
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set_error(STATUS_NO_MEMORY);
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return NULL;
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}
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async->obj = obj;
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async->thread = (struct thread *)grab_object(thread);
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async->overlapped = overlapped;
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async->next = NULL;
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async->prev = NULL;
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async->q = NULL;
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async->status = STATUS_PENDING;
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async->timeout = NULL;
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return async;
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}
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void async_add_timeout(struct async *async, int timeout)
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{
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if(timeout)
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{
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gettimeofday( &async->when, 0 );
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add_timeout( &async->when, timeout );
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async->timeout = add_timeout_user( &async->when, async_callback, async );
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}
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}
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DECL_HANDLER(register_async)
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{
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struct object *obj = get_handle_obj( current->process, req->handle, 0, NULL);
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if ( !(obj) || !obj->ops->queue_async )
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{
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set_error(STATUS_INVALID_HANDLE);
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return;
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}
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/*
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* The queue_async method must do the following:
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*
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* 1. Get the async_queue for the request of given type.
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* 2. Call find_async() to look for the specific client request in the queue (=> NULL if not found).
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* 3. If status is STATUS_PENDING:
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* a) If no async request found in step 2 (new request): call create_async() to initialize one.
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* b) Set request's status to STATUS_PENDING.
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* c) If the "queue" field of the async request is NULL: call async_insert() to put it into the queue.
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* Otherwise:
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* If the async request was found in step 2, destroy it by calling destroy_async().
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* 4. Carry out any operations necessary to adjust the object's poll events
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* Usually: set_elect_events (obj, obj->ops->get_poll_events()).
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*
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* See also the implementations in file.c, serial.c, and sock.c.
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*/
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obj->ops->queue_async (obj, req->overlapped, req->status, req->type, req->count);
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release_object(obj);
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}
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