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250 lines
7.4 KiB
C
250 lines
7.4 KiB
C
/*
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* Server-side IO completion ports implementation
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*
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* Copyright (C) 2007 Andrey Turkin
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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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*/
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/* FIXMEs:
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* - built-in wait queues used which means:
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* + threads are awaken FIFO and not LIFO as native does
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* + "max concurrent active threads" parameter not used
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* + completion handle is waitable, while native isn't
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*/
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#include "config.h"
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#include <stdarg.h>
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#include <stdio.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 "handle.h"
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#include "request.h"
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static const WCHAR completion_name[] = {'I','o','C','o','m','p','l','e','t','i','o','n'};
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struct type_descr completion_type =
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{
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{ completion_name, sizeof(completion_name) }, /* name */
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IO_COMPLETION_ALL_ACCESS, /* valid_access */
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{ /* mapping */
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STANDARD_RIGHTS_READ | IO_COMPLETION_QUERY_STATE,
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STANDARD_RIGHTS_WRITE | IO_COMPLETION_MODIFY_STATE,
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STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE,
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IO_COMPLETION_ALL_ACCESS
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},
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};
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struct completion
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{
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struct object obj;
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struct list queue;
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unsigned int depth;
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};
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static void completion_dump( struct object*, int );
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static int completion_signaled( struct object *obj, struct wait_queue_entry *entry );
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static void completion_destroy( struct object * );
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static const struct object_ops completion_ops =
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{
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sizeof(struct completion), /* size */
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&completion_type, /* type */
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completion_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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completion_signaled, /* signaled */
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no_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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default_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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directory_link_name, /* link_name */
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default_unlink_name, /* 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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completion_destroy /* destroy */
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};
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struct comp_msg
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{
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struct list queue_entry;
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apc_param_t ckey;
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apc_param_t cvalue;
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apc_param_t information;
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unsigned int status;
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};
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static void completion_destroy( struct object *obj)
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{
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struct completion *completion = (struct completion *) obj;
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struct comp_msg *tmp, *next;
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LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &completion->queue, struct comp_msg, queue_entry )
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{
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free( tmp );
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}
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}
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static void completion_dump( struct object *obj, int verbose )
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{
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struct completion *completion = (struct completion *) obj;
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assert( obj->ops == &completion_ops );
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fprintf( stderr, "Completion depth=%u\n", completion->depth );
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}
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static int completion_signaled( struct object *obj, struct wait_queue_entry *entry )
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{
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struct completion *completion = (struct completion *)obj;
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return !list_empty( &completion->queue );
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}
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static struct completion *create_completion( struct object *root, const struct unicode_str *name,
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unsigned int attr, unsigned int concurrent,
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const struct security_descriptor *sd )
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{
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struct completion *completion;
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if ((completion = create_named_object( root, &completion_ops, name, attr, sd )))
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{
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if (get_error() != STATUS_OBJECT_NAME_EXISTS)
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{
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list_init( &completion->queue );
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completion->depth = 0;
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}
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}
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return completion;
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}
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struct completion *get_completion_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
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return (struct completion *) get_handle_obj( process, handle, access, &completion_ops );
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}
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void add_completion( struct completion *completion, apc_param_t ckey, apc_param_t cvalue,
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unsigned int status, apc_param_t information )
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{
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struct comp_msg *msg = mem_alloc( sizeof( *msg ) );
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if (!msg)
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return;
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msg->ckey = ckey;
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msg->cvalue = cvalue;
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msg->status = status;
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msg->information = information;
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list_add_tail( &completion->queue, &msg->queue_entry );
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completion->depth++;
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wake_up( &completion->obj, 1 );
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}
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/* create a completion */
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DECL_HANDLER(create_completion)
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{
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struct completion *completion;
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struct unicode_str name;
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struct object *root;
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const struct security_descriptor *sd;
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const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
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if (!objattr) return;
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if ((completion = create_completion( root, &name, objattr->attributes, req->concurrent, sd )))
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{
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reply->handle = alloc_handle( current->process, completion, req->access, objattr->attributes );
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release_object( completion );
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}
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if (root) release_object( root );
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}
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/* open a completion */
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DECL_HANDLER(open_completion)
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{
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struct unicode_str name = get_req_unicode_str();
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reply->handle = open_object( current->process, req->rootdir, req->access,
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&completion_ops, &name, req->attributes );
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}
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/* add completion to completion port */
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DECL_HANDLER(add_completion)
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{
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struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_MODIFY_STATE );
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if (!completion) return;
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add_completion( completion, req->ckey, req->cvalue, req->status, req->information );
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release_object( completion );
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}
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/* get completion from completion port */
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DECL_HANDLER(remove_completion)
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{
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struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_MODIFY_STATE );
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struct list *entry;
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struct comp_msg *msg;
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if (!completion) return;
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entry = list_head( &completion->queue );
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if (!entry)
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set_error( STATUS_PENDING );
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else
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{
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list_remove( entry );
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completion->depth--;
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msg = LIST_ENTRY( entry, struct comp_msg, queue_entry );
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reply->ckey = msg->ckey;
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reply->cvalue = msg->cvalue;
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reply->status = msg->status;
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reply->information = msg->information;
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free( msg );
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}
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release_object( completion );
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}
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/* get queue depth for completion port */
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DECL_HANDLER(query_completion)
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{
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struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_QUERY_STATE );
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if (!completion) return;
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reply->depth = completion->depth;
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release_object( completion );
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}
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