256 lines
8.0 KiB
C
256 lines
8.0 KiB
C
/*
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* Server-side async I/O support
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*
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* Copyright (C) 2007 Alexandre Julliard
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winternl.h"
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#include "object.h"
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#include "file.h"
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#include "request.h"
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struct async
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{
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struct object obj; /* object header */
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struct thread *thread; /* owning thread */
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struct list queue_entry; /* entry in async queue list */
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struct async_queue *queue; /* queue containing this async */
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struct timeout_user *timeout;
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unsigned int timeout_status; /* status to report upon timeout */
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struct event *event;
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async_data_t data; /* data for async I/O call */
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};
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static void async_dump( struct object *obj, int verbose );
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static void async_destroy( struct object *obj );
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static const struct object_ops async_ops =
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{
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sizeof(struct async), /* size */
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async_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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no_map_access, /* map_access */
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no_lookup_name, /* lookup_name */
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no_open_file, /* open_file */
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no_close_handle, /* close_handle */
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async_destroy /* destroy */
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};
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struct async_queue
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{
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struct object obj; /* object header */
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struct fd *fd; /* file descriptor owning this queue */
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struct list queue; /* queue of async objects */
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};
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static void async_queue_dump( struct object *obj, int verbose );
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static const struct object_ops async_queue_ops =
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{
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sizeof(struct async_queue), /* size */
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async_queue_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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no_map_access, /* map_access */
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no_lookup_name, /* lookup_name */
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no_open_file, /* open_file */
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no_close_handle, /* close_handle */
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no_destroy /* destroy */
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};
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static void async_dump( struct object *obj, int verbose )
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{
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struct async *async = (struct async *)obj;
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assert( obj->ops == &async_ops );
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fprintf( stderr, "Async thread=%p\n", async->thread );
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}
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static void async_destroy( struct object *obj )
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{
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struct async *async = (struct async *)obj;
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assert( obj->ops == &async_ops );
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if (async->timeout) remove_timeout_user( async->timeout );
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if (async->event) release_object( async->event );
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release_object( async->queue );
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async->queue = NULL;
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release_object( async->thread );
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}
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static void async_queue_dump( struct object *obj, int verbose )
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{
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struct async_queue *async_queue = (struct async_queue *)obj;
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assert( obj->ops == &async_queue_ops );
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fprintf( stderr, "Async queue fd=%p\n", async_queue->fd );
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}
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/* notifies client thread of new status of its async request */
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/* destroys the server side of it */
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static void async_terminate( struct async *async, unsigned int status )
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{
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apc_call_t data;
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memset( &data, 0, sizeof(data) );
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data.type = APC_ASYNC_IO;
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data.async_io.func = async->data.callback;
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data.async_io.user = async->data.arg;
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data.async_io.sb = async->data.iosb;
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data.async_io.status = status;
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thread_queue_apc( async->thread, &async->obj, &data );
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if (async->timeout) remove_timeout_user( async->timeout );
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async->timeout = NULL;
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list_remove( &async->queue_entry );
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release_object( async );
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}
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/* callback for timeout on an async request */
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static void async_timeout( void *private )
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{
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struct async *async = private;
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async->timeout = NULL;
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async_terminate( async, async->timeout_status );
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}
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/* create a new async queue for a given fd */
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struct async_queue *create_async_queue( struct fd *fd )
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{
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struct async_queue *queue = alloc_object( &async_queue_ops );
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if (queue)
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{
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queue->fd = fd;
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list_init( &queue->queue );
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}
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return queue;
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}
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/* free an async queue, cancelling all async operations */
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void free_async_queue( struct async_queue *queue )
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{
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if (!queue) return;
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queue->fd = NULL;
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async_wake_up( queue, STATUS_HANDLES_CLOSED );
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release_object( queue );
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}
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/* create an async on a given queue of a fd */
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struct async *create_async( struct thread *thread, struct async_queue *queue, const async_data_t *data )
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{
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struct event *event = NULL;
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struct async *async;
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if (data->event && !(event = get_event_obj( thread->process, data->event, EVENT_MODIFY_STATE )))
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return NULL;
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if (!(async = alloc_object( &async_ops )))
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{
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if (event) release_object( event );
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return NULL;
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}
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async->thread = (struct thread *)grab_object( thread );
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async->event = event;
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async->data = *data;
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async->timeout = NULL;
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async->queue = (struct async_queue *)grab_object( queue );
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list_add_tail( &queue->queue, &async->queue_entry );
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grab_object( async );
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if (event) reset_event( event );
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return async;
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}
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/* set the timeout of an async operation */
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void async_set_timeout( struct async *async, const struct timeval *timeout, unsigned int status )
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{
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if (async->timeout) remove_timeout_user( async->timeout );
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if (timeout) async->timeout = add_timeout_user( timeout, async_timeout, async );
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else async->timeout = NULL;
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async->timeout_status = status;
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}
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/* store the result of the client-side async callback */
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void async_set_result( struct object *obj, unsigned int status )
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{
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struct async *async = (struct async *)obj;
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if (obj->ops != &async_ops) return; /* in case the client messed up the APC results */
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if (status == STATUS_PENDING)
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{
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/* FIXME: restart the async operation */
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}
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else
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{
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if (async->data.apc)
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{
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apc_call_t data;
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data.type = APC_USER;
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data.user.func = async->data.apc;
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data.user.args[0] = (unsigned long)async->data.apc_arg;
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data.user.args[1] = (unsigned long)async->data.iosb;
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data.user.args[2] = 0;
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thread_queue_apc( async->thread, NULL, &data );
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}
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if (async->event) set_event( async->event );
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}
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}
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/* check if an async operation is waiting to be alerted */
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int async_waiting( struct async_queue *queue )
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{
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return queue && !list_empty( &queue->queue );
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}
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/* wake up async operations on the queue */
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void async_wake_up( struct async_queue *queue, unsigned int status )
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{
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struct list *ptr, *next;
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if (!queue) return;
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LIST_FOR_EACH_SAFE( ptr, next, &queue->queue )
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{
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struct async *async = LIST_ENTRY( ptr, struct async, queue_entry );
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async_terminate( async, status );
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if (status == STATUS_ALERTED) break; /* only wake up the first one */
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}
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}
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