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862 lines
28 KiB
C
862 lines
28 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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#include "process.h"
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#include "handle.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 list process_entry; /* entry in process list */
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struct async_queue *queue; /* queue containing this async */
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struct fd *fd; /* fd associated with an unqueued 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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struct iosb *iosb; /* I/O status block */
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obj_handle_t wait_handle; /* pre-allocated wait handle */
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unsigned int initial_status; /* status returned from initial request */
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unsigned int signaled :1;
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unsigned int pending :1; /* request successfully queued, but pending */
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unsigned int direct_result :1;/* a flag if we're passing result directly from request instead of APC */
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unsigned int alerted :1; /* fd is signaled, but we are waiting for client-side I/O */
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unsigned int terminated :1; /* async has been terminated */
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unsigned int canceled :1; /* have we already queued cancellation for this async? */
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unsigned int unknown_status :1; /* initial status is not known yet */
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unsigned int blocking :1; /* async is blocking */
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struct completion *completion; /* completion associated with fd */
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apc_param_t comp_key; /* completion key associated with fd */
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unsigned int comp_flags; /* completion flags */
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async_completion_callback completion_callback; /* callback to be called on completion */
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void *completion_callback_private; /* argument to completion_callback */
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};
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static void async_dump( struct object *obj, int verbose );
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static int async_signaled( struct object *obj, struct wait_queue_entry *entry );
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static void async_satisfied( struct object * obj, struct wait_queue_entry *entry );
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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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&no_type, /* type */
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async_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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async_signaled, /* signaled */
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async_satisfied, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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default_map_access, /* map_access */
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default_get_sd, /* get_sd */
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default_set_sd, /* set_sd */
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no_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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no_link_name, /* link_name */
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NULL, /* unlink_name */
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no_open_file, /* open_file */
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no_kernel_obj_list, /* get_kernel_obj_list */
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no_close_handle, /* close_handle */
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async_destroy /* destroy */
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};
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static inline void async_reselect( struct async *async )
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{
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if (async->queue && async->fd) fd_reselect_async( async->fd, async->queue );
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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 int async_signaled( struct object *obj, struct wait_queue_entry *entry )
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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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return async->signaled;
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}
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static void async_satisfied( struct object *obj, struct wait_queue_entry *entry )
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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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/* we only return an async handle for asyncs created via create_request_async() */
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assert( async->iosb );
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if (async->direct_result)
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{
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async_set_result( &async->obj, async->iosb->status, async->iosb->result );
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async->direct_result = 0;
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}
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if (async->initial_status == STATUS_PENDING && async->blocking)
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set_wait_status( entry, async->iosb->status );
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else
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set_wait_status( entry, async->initial_status );
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/* close wait handle here to avoid extra server round trip */
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if (async->wait_handle)
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{
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close_handle( async->thread->process, async->wait_handle );
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async->wait_handle = 0;
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}
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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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list_remove( &async->process_entry );
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if (async->queue)
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{
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list_remove( &async->queue_entry );
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async_reselect( async );
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}
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else if (async->fd) release_object( async->fd );
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if (async->timeout) remove_timeout_user( async->timeout );
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if (async->completion) release_object( async->completion );
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if (async->event) release_object( async->event );
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if (async->iosb) release_object( async->iosb );
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release_object( async->thread );
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}
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/* notifies client thread of new status of its async request */
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void async_terminate( struct async *async, unsigned int status )
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{
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struct iosb *iosb = async->iosb;
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if (async->terminated) return;
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async->terminated = 1;
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if (async->iosb && async->iosb->status == STATUS_PENDING) async->iosb->status = status;
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if (status == STATUS_ALERTED)
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async->alerted = 1;
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/* if no APC could be queued (e.g. the process is terminated),
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* thread_queue_apc() may trigger async_set_result(), which may drop the
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* last reference to the async, so grab a temporary reference here */
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grab_object( async );
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if (!async->direct_result)
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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.user = async->data.user;
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data.async_io.result = iosb ? iosb->result : 0;
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/* this can happen if the initial status was unknown (i.e. for device
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* files). the client should not fill the IOSB in this case; pass it as
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* NULL to communicate that.
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* note that we check the IOSB status and not the initial status */
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if (NT_ERROR( status ) && (!is_fd_overlapped( async->fd ) || !async->pending))
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data.async_io.sb = 0;
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else
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data.async_io.sb = async->data.iosb;
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/* if there is output data, the client needs to make an extra request
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* to retrieve it; use STATUS_ALERTED to signal this case */
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if (iosb && iosb->out_data)
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data.async_io.status = STATUS_ALERTED;
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else
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data.async_io.status = status;
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thread_queue_apc( async->thread->process, async->thread, &async->obj, &data );
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}
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async_reselect( async );
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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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/* 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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struct async *async, *next;
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LIST_FOR_EACH_ENTRY_SAFE( async, next, &queue->queue, struct async, queue_entry )
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{
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if (!async->completion) async->completion = fd_get_completion( async->fd, &async->comp_key );
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async->fd = NULL;
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async_terminate( async, STATUS_HANDLES_CLOSED );
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async->queue = NULL;
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release_object( &async->obj );
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}
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}
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void queue_async( struct async_queue *queue, struct async *async )
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{
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/* fd will be set to NULL in free_async_queue when fd is destroyed */
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release_object( async->fd );
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async->queue = queue;
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grab_object( async );
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list_add_tail( &queue->queue, &async->queue_entry );
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set_fd_signaled( async->fd, 0 );
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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 fd *fd, struct thread *thread, const async_data_t *data, struct iosb *iosb )
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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 = NULL;
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async->fd = (struct fd *)grab_object( fd );
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async->initial_status = STATUS_PENDING;
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async->signaled = 0;
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async->pending = 1;
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async->wait_handle = 0;
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async->direct_result = 0;
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async->alerted = 0;
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async->terminated = 0;
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async->canceled = 0;
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async->unknown_status = 0;
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async->blocking = !is_fd_overlapped( fd );
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async->completion = fd_get_completion( fd, &async->comp_key );
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async->comp_flags = 0;
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async->completion_callback = NULL;
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async->completion_callback_private = NULL;
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if (iosb) async->iosb = (struct iosb *)grab_object( iosb );
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else async->iosb = NULL;
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list_add_head( &thread->process->asyncs, &async->process_entry );
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if (event) reset_event( event );
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if (async->completion && data->apc)
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{
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release_object( async );
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set_error( STATUS_INVALID_PARAMETER );
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return NULL;
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}
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return async;
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}
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/* set the initial status of an async whose status was previously unknown
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* the initial status may be STATUS_PENDING */
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void async_set_initial_status( struct async *async, unsigned int status )
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{
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async->initial_status = status;
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async->unknown_status = 0;
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}
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void set_async_pending( struct async *async )
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{
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if (!async->terminated)
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async->pending = 1;
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}
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void async_wake_obj( struct async *async )
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{
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assert( !async->unknown_status );
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if (!async->blocking)
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{
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async->signaled = 1;
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wake_up( &async->obj, 0 );
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}
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}
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static void async_call_completion_callback( struct async *async )
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{
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if (async->completion_callback)
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async->completion_callback( async->completion_callback_private );
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async->completion_callback = NULL;
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}
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/* return async object status and wait handle to client */
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obj_handle_t async_handoff( struct async *async, data_size_t *result, int force_blocking )
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{
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async->blocking = force_blocking || async->blocking;
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if (async->unknown_status)
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{
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/* even the initial status is not known yet */
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set_error( STATUS_PENDING );
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return async->wait_handle;
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}
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if (get_error() == STATUS_ALERTED)
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{
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/* give the client opportunity to complete synchronously. after the
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* client performs the I/O, it reports the result back to the server
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* via the set_async_direct_result request. if it turns out that the
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* I/O request is not actually immediately satiable, the client may
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* then choose to re-queue the async by reporting STATUS_PENDING
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* instead.
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*
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* since we're deferring the initial I/O (to the client), we mark the
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* async as having unknown initial status (unknown_status = 1). note
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* that we don't reuse async_set_unknown_status() here. this is because
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* the one responsible for performing the I/O is not the device driver,
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* but instead the client that requested the I/O in the first place.
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*
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* also, async_set_unknown_status() would set direct_result to zero
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* forcing APC_ASYNC_IO to fire in async_terminate(), which is not
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* useful due to subtle semantic differences between synchronous and
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* asynchronous completion.
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*/
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async->unknown_status = 1;
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async_terminate( async, STATUS_ALERTED );
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return async->wait_handle;
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}
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async->initial_status = get_error();
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if (!async->pending && NT_ERROR( get_error() ))
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{
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async->iosb->status = get_error();
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async_call_completion_callback( async );
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close_handle( async->thread->process, async->wait_handle );
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async->wait_handle = 0;
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return 0;
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}
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if (get_error() != STATUS_PENDING)
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{
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/* status and data are already set and returned */
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async_terminate( async, get_error() );
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}
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else if (async->iosb->status != STATUS_PENDING)
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{
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/* result is already available in iosb, return it */
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if (async->iosb->out_data)
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{
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set_reply_data_ptr( async->iosb->out_data, async->iosb->out_size );
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async->iosb->out_data = NULL;
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}
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}
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if (async->iosb->status != STATUS_PENDING)
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{
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if (result) *result = async->iosb->result;
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async->signaled = 1;
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}
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else
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{
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async->direct_result = 0;
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async->pending = 1;
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if (!async->blocking)
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{
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close_handle( async->thread->process, async->wait_handle);
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async->wait_handle = 0;
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}
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}
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async->initial_status = async->iosb->status;
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set_error( async->iosb->status );
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return async->wait_handle;
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}
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/* complete a request-based async with a pre-allocated buffer */
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void async_request_complete( struct async *async, unsigned int status, data_size_t result,
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data_size_t out_size, void *out_data )
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{
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struct iosb *iosb = async_get_iosb( async );
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/* the async may have already been canceled */
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if (iosb->status != STATUS_PENDING)
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{
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release_object( iosb );
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free( out_data );
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return;
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}
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iosb->status = status;
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iosb->result = result;
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iosb->out_data = out_data;
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iosb->out_size = out_size;
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release_object( iosb );
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async_terminate( async, status );
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}
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/* complete a request-based async */
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void async_request_complete_alloc( struct async *async, unsigned int status, data_size_t result,
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data_size_t out_size, const void *out_data )
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{
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void *out_data_copy = NULL;
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if (out_size && !(out_data_copy = memdup( out_data, out_size )))
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{
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async_terminate( async, STATUS_NO_MEMORY );
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return;
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}
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async_request_complete( async, status, result, out_size, out_data_copy );
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}
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/* mark an async as having unknown initial status */
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void async_set_unknown_status( struct async *async )
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{
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async->unknown_status = 1;
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async->direct_result = 0;
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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, timeout_t 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 != TIMEOUT_INFINITE) 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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/* set a callback to be notified when the async is completed */
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void async_set_completion_callback( struct async *async, async_completion_callback func, void *private )
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{
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async->completion_callback = func;
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async->completion_callback_private = private;
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}
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static void add_async_completion( struct async *async, apc_param_t cvalue, unsigned int status,
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apc_param_t information )
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{
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if (async->fd && !async->completion) async->completion = fd_get_completion( async->fd, &async->comp_key );
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if (async->completion) add_completion( async->completion, async->comp_key, cvalue, status, information );
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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, apc_param_t total )
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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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assert( async->terminated ); /* it must have been woken up if we get a result */
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if (async->unknown_status) async_set_initial_status( async, status );
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if (async->alerted && status == STATUS_PENDING) /* restart it */
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{
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async->terminated = 0;
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async->alerted = 0;
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async_reselect( async );
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}
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else
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{
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if (async->timeout) remove_timeout_user( async->timeout );
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async->timeout = NULL;
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async->terminated = 1;
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if (async->iosb) async->iosb->status = status;
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|
|
/* don't signal completion if the async failed synchronously
|
|
* this can happen if the initial status was unknown (i.e. for device files)
|
|
* note that we check the IOSB status here, not the initial status */
|
|
if (async->pending || !NT_ERROR( status ))
|
|
{
|
|
if (async->data.apc)
|
|
{
|
|
apc_call_t data;
|
|
memset( &data, 0, sizeof(data) );
|
|
data.type = APC_USER;
|
|
data.user.func = async->data.apc;
|
|
data.user.args[0] = async->data.apc_context;
|
|
data.user.args[1] = async->data.iosb;
|
|
data.user.args[2] = 0;
|
|
thread_queue_apc( NULL, async->thread, NULL, &data );
|
|
}
|
|
else if (async->data.apc_context && (async->pending ||
|
|
!(async->comp_flags & FILE_SKIP_COMPLETION_PORT_ON_SUCCESS)))
|
|
{
|
|
add_async_completion( async, async->data.apc_context, status, total );
|
|
}
|
|
|
|
if (async->event) set_event( async->event );
|
|
else if (async->fd) set_fd_signaled( async->fd, 1 );
|
|
}
|
|
|
|
if (!async->signaled)
|
|
{
|
|
async->signaled = 1;
|
|
wake_up( &async->obj, 0 );
|
|
}
|
|
|
|
async_call_completion_callback( async );
|
|
|
|
if (async->queue)
|
|
{
|
|
list_remove( &async->queue_entry );
|
|
async_reselect( async );
|
|
async->fd = NULL;
|
|
async->queue = NULL;
|
|
release_object( async );
|
|
}
|
|
}
|
|
}
|
|
|
|
/* check if an async operation is waiting to be alerted */
|
|
int async_waiting( struct async_queue *queue )
|
|
{
|
|
struct list *ptr;
|
|
struct async *async;
|
|
|
|
if (!(ptr = list_head( &queue->queue ))) return 0;
|
|
async = LIST_ENTRY( ptr, struct async, queue_entry );
|
|
return !async->terminated;
|
|
}
|
|
|
|
static int cancel_async( struct process *process, struct object *obj, struct thread *thread, client_ptr_t iosb )
|
|
{
|
|
struct async *async;
|
|
int woken = 0;
|
|
|
|
/* FIXME: it would probably be nice to replace the "canceled" flag with a
|
|
* single LIST_FOR_EACH_ENTRY_SAFE, but currently cancelling an async can
|
|
* cause other asyncs to be removed via async_reselect() */
|
|
|
|
restart:
|
|
LIST_FOR_EACH_ENTRY( async, &process->asyncs, struct async, process_entry )
|
|
{
|
|
if (async->terminated || async->canceled) continue;
|
|
if ((!obj || (get_fd_user( async->fd ) == obj)) &&
|
|
(!thread || async->thread == thread) &&
|
|
(!iosb || async->data.iosb == iosb))
|
|
{
|
|
async->canceled = 1;
|
|
fd_cancel_async( async->fd, async );
|
|
woken++;
|
|
goto restart;
|
|
}
|
|
}
|
|
return woken;
|
|
}
|
|
|
|
static int cancel_blocking( struct process *process, struct thread *thread, client_ptr_t iosb )
|
|
{
|
|
struct async *async;
|
|
int woken = 0;
|
|
|
|
restart:
|
|
LIST_FOR_EACH_ENTRY( async, &process->asyncs, struct async, process_entry )
|
|
{
|
|
if (async->terminated || async->canceled) continue;
|
|
if (async->blocking && async->thread == thread &&
|
|
(!iosb || async->data.iosb == iosb))
|
|
{
|
|
async->canceled = 1;
|
|
fd_cancel_async( async->fd, async );
|
|
woken++;
|
|
goto restart;
|
|
}
|
|
}
|
|
return woken;
|
|
}
|
|
|
|
void cancel_process_asyncs( struct process *process )
|
|
{
|
|
cancel_async( process, NULL, NULL, 0 );
|
|
}
|
|
|
|
void cancel_terminating_thread_asyncs( struct thread *thread )
|
|
{
|
|
struct async *async;
|
|
|
|
restart:
|
|
LIST_FOR_EACH_ENTRY( async, &thread->process->asyncs, struct async, process_entry )
|
|
{
|
|
if (async->thread != thread || async->terminated || async->canceled) continue;
|
|
if (async->completion && async->data.apc_context && !async->event) continue;
|
|
|
|
async->canceled = 1;
|
|
fd_cancel_async( async->fd, async );
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
/* wake up async operations on the queue */
|
|
void async_wake_up( struct async_queue *queue, unsigned int status )
|
|
{
|
|
struct list *ptr, *next;
|
|
|
|
LIST_FOR_EACH_SAFE( ptr, next, &queue->queue )
|
|
{
|
|
struct async *async = LIST_ENTRY( ptr, struct async, queue_entry );
|
|
async_terminate( async, status );
|
|
if (status == STATUS_ALERTED) break; /* only wake up the first one */
|
|
}
|
|
}
|
|
|
|
static void iosb_dump( struct object *obj, int verbose );
|
|
static void iosb_destroy( struct object *obj );
|
|
|
|
static const struct object_ops iosb_ops =
|
|
{
|
|
sizeof(struct iosb), /* size */
|
|
&no_type, /* type */
|
|
iosb_dump, /* dump */
|
|
no_add_queue, /* add_queue */
|
|
NULL, /* remove_queue */
|
|
NULL, /* signaled */
|
|
NULL, /* satisfied */
|
|
no_signal, /* signal */
|
|
no_get_fd, /* get_fd */
|
|
default_map_access, /* map_access */
|
|
default_get_sd, /* get_sd */
|
|
default_set_sd, /* set_sd */
|
|
no_get_full_name, /* get_full_name */
|
|
no_lookup_name, /* lookup_name */
|
|
no_link_name, /* link_name */
|
|
NULL, /* unlink_name */
|
|
no_open_file, /* open_file */
|
|
no_kernel_obj_list, /* get_kernel_obj_list */
|
|
no_close_handle, /* close_handle */
|
|
iosb_destroy /* destroy */
|
|
};
|
|
|
|
static void iosb_dump( struct object *obj, int verbose )
|
|
{
|
|
assert( obj->ops == &iosb_ops );
|
|
fprintf( stderr, "I/O status block\n" );
|
|
}
|
|
|
|
static void iosb_destroy( struct object *obj )
|
|
{
|
|
struct iosb *iosb = (struct iosb *)obj;
|
|
|
|
free( iosb->in_data );
|
|
free( iosb->out_data );
|
|
}
|
|
|
|
/* allocate iosb struct */
|
|
static struct iosb *create_iosb( const void *in_data, data_size_t in_size, data_size_t out_size )
|
|
{
|
|
struct iosb *iosb;
|
|
|
|
if (!(iosb = alloc_object( &iosb_ops ))) return NULL;
|
|
|
|
iosb->status = STATUS_PENDING;
|
|
iosb->result = 0;
|
|
iosb->in_size = in_size;
|
|
iosb->in_data = NULL;
|
|
iosb->out_size = out_size;
|
|
iosb->out_data = NULL;
|
|
|
|
if (in_size && !(iosb->in_data = memdup( in_data, in_size )))
|
|
{
|
|
release_object( iosb );
|
|
iosb = NULL;
|
|
}
|
|
|
|
return iosb;
|
|
}
|
|
|
|
/* create an async associated with iosb for async-based requests
|
|
* returned async must be passed to async_handoff */
|
|
struct async *create_request_async( struct fd *fd, unsigned int comp_flags, const async_data_t *data )
|
|
{
|
|
struct async *async;
|
|
struct iosb *iosb;
|
|
|
|
if (!(iosb = create_iosb( get_req_data(), get_req_data_size(), get_reply_max_size() )))
|
|
return NULL;
|
|
|
|
async = create_async( fd, current, data, iosb );
|
|
release_object( iosb );
|
|
if (async)
|
|
{
|
|
if (!(async->wait_handle = alloc_handle( current->process, async, SYNCHRONIZE, 0 )))
|
|
{
|
|
release_object( async );
|
|
return NULL;
|
|
}
|
|
async->pending = 0;
|
|
async->direct_result = 1;
|
|
async->comp_flags = comp_flags;
|
|
}
|
|
return async;
|
|
}
|
|
|
|
struct iosb *async_get_iosb( struct async *async )
|
|
{
|
|
return async->iosb ? (struct iosb *)grab_object( async->iosb ) : NULL;
|
|
}
|
|
|
|
struct thread *async_get_thread( struct async *async )
|
|
{
|
|
return async->thread;
|
|
}
|
|
|
|
/* find the first pending async in queue */
|
|
struct async *find_pending_async( struct async_queue *queue )
|
|
{
|
|
struct async *async;
|
|
LIST_FOR_EACH_ENTRY( async, &queue->queue, struct async, queue_entry )
|
|
if (!async->terminated) return (struct async *)grab_object( async );
|
|
return NULL;
|
|
}
|
|
|
|
/* cancels sync I/O on a thread */
|
|
DECL_HANDLER(cancel_sync)
|
|
{
|
|
struct thread *thread = get_thread_from_handle( req->handle, THREAD_TERMINATE );
|
|
|
|
if (thread)
|
|
{
|
|
if (!cancel_blocking( current->process, thread, req->iosb ))
|
|
set_error( STATUS_NOT_FOUND );
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
/* cancels all async I/O */
|
|
DECL_HANDLER(cancel_async)
|
|
{
|
|
struct object *obj = get_handle_obj( current->process, req->handle, 0, NULL );
|
|
struct thread *thread = req->only_thread ? current : NULL;
|
|
|
|
if (obj)
|
|
{
|
|
int count = cancel_async( current->process, obj, thread, req->iosb );
|
|
if (!count && req->iosb) set_error( STATUS_NOT_FOUND );
|
|
release_object( obj );
|
|
}
|
|
}
|
|
|
|
/* get async result from associated iosb */
|
|
DECL_HANDLER(get_async_result)
|
|
{
|
|
struct iosb *iosb = NULL;
|
|
struct async *async;
|
|
|
|
LIST_FOR_EACH_ENTRY( async, ¤t->process->asyncs, struct async, process_entry )
|
|
if (async->data.user == req->user_arg)
|
|
{
|
|
iosb = async->iosb;
|
|
break;
|
|
}
|
|
|
|
if (!iosb)
|
|
{
|
|
set_error( STATUS_INVALID_PARAMETER );
|
|
return;
|
|
}
|
|
|
|
if (iosb->out_data)
|
|
{
|
|
data_size_t size = min( iosb->out_size, get_reply_max_size() );
|
|
if (size)
|
|
{
|
|
set_reply_data_ptr( iosb->out_data, size );
|
|
iosb->out_data = NULL;
|
|
}
|
|
}
|
|
set_error( iosb->status );
|
|
}
|
|
|
|
/* notify direct completion of async and close the wait handle if not blocking */
|
|
DECL_HANDLER(set_async_direct_result)
|
|
{
|
|
struct async *async = (struct async *)get_handle_obj( current->process, req->handle, 0, &async_ops );
|
|
unsigned int status = req->status;
|
|
|
|
if (!async) return;
|
|
|
|
if (!async->unknown_status || !async->terminated || !async->alerted)
|
|
{
|
|
set_error( STATUS_INVALID_PARAMETER );
|
|
release_object( &async->obj );
|
|
return;
|
|
}
|
|
|
|
if (status == STATUS_PENDING)
|
|
{
|
|
async->direct_result = 0;
|
|
async->pending = 1;
|
|
}
|
|
else if (req->mark_pending)
|
|
{
|
|
async->pending = 1;
|
|
}
|
|
|
|
/* if the I/O has completed successfully (or unsuccessfully, and
|
|
* async->pending is set), the client would have already set the IOSB.
|
|
* therefore, we can do async_set_result() directly and let the client skip
|
|
* waiting on wait_handle.
|
|
*/
|
|
async_set_result( &async->obj, status, req->information );
|
|
|
|
/* close wait handle here to avoid extra server round trip, if the I/O
|
|
* either has completed, or is pending and not blocking.
|
|
*/
|
|
if (status != STATUS_PENDING || !async->blocking)
|
|
{
|
|
close_handle( async->thread->process, async->wait_handle );
|
|
async->wait_handle = 0;
|
|
}
|
|
|
|
/* report back to the client whether the wait handle has been closed.
|
|
* handle will be 0 if closed by us; otherwise the original value is
|
|
* retained
|
|
*/
|
|
reply->handle = async->wait_handle;
|
|
|
|
release_object( &async->obj );
|
|
}
|