server/completion.c

   1 /*
   2  * Server-side IO completion ports implementation
   3  *
   4  * Copyright (C) 2007 Andrey Turkin
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  */
  21
  22 /* FIXMEs:
  23  *  - built-in wait queues used which means:
  24  *    + threads are awaken FIFO and not LIFO as native does
  25  *    + "max concurrent active threads" parameter not used
  26  *    + completion handle is waitable, while native isn't
  27  */
  28
  29 #include "config.h"
  30 #include "wine/port.h"
  31
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34
  35 #include "ntstatus.h"
  36 #define WIN32_NO_STATUS
  37 #include "windef.h"
  38 #include "winternl.h"
  39
  40 #include "wine/unicode.h"
  41 #include "object.h"
  42 #include "file.h"
  43 #include "handle.h"
  44 #include "request.h"
  45
  46
  47 struct completion
  48 {
  49     struct object  obj;
  50     struct list    queue;
  51     unsigned int   depth;
  52 };
  53
  54 static void completion_dump( struct object*, int );
  55 static struct object_type *completion_get_type( struct object *obj );
  56 static void completion_destroy( struct object * );
  57 static int  completion_signaled( struct object *obj, struct thread *thread );
  58
  59 static const struct object_ops completion_ops =
  60 {
  61     sizeof(struct completion), /* size */
  62     completion_dump,           /* dump */
  63     completion_get_type,       /* get_type */
  64     add_queue,                 /* add_queue */
  65     remove_queue,              /* remove_queue */
  66     completion_signaled,       /* signaled */
  67     no_satisfied,              /* satisfied */
  68     no_signal,                 /* signal */
  69     no_get_fd,                 /* get_fd */
  70     no_map_access,             /* map_access */
  71     default_get_sd,            /* get_sd */
  72     default_set_sd,            /* set_sd */
  73     no_lookup_name,            /* lookup_name */
  74     no_open_file,              /* open_file */
  75     no_close_handle,           /* close_handle */
  76     completion_destroy         /* destroy */
  77 };
  78
  79 struct comp_msg
  80 {
  81     struct   list queue_entry;
  82     unsigned long ckey;
  83     unsigned long cvalue;
  84     unsigned long information;
  85     unsigned int  status;
  86 };
  87
  88 static void completion_destroy( struct object *obj)
  89 {
  90     struct completion *completion = (struct completion *) obj;
  91     struct comp_msg *tmp, *next;
  92
  93     LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &completion->queue, struct comp_msg, queue_entry )
  94     {
  95         free( tmp );
  96     }
  97 }
  98
  99 static void completion_dump( struct object *obj, int verbose )
 100 {
 101     struct completion *completion = (struct completion *) obj;
 102
 103     assert( obj->ops == &completion_ops );
 104     fprintf( stderr, "Completion " );
 105     dump_object_name( &completion->obj );
 106     fprintf( stderr, " (%u packets pending)\n", completion->depth );
 107 }
 108
 109 static struct object_type *completion_get_type( struct object *obj )
 110 {
 111     static const WCHAR name[] = {'C','o','m','p','l','e','t','i','o','n'};
 112     static const struct unicode_str str = { name, sizeof(name) };
 113     return get_object_type( &str );
 114 }
 115
 116 static int completion_signaled( struct object *obj, struct thread *thread )
 117 {
 118     struct completion *completion = (struct completion *)obj;
 119
 120     return !list_empty( &completion->queue );
 121 }
 122
 123 static struct completion *create_completion( struct directory *root, const struct unicode_str *name, unsigned int attr, unsigned int concurrent )
 124 {
 125     struct completion *completion;
 126
 127     if ((completion = create_named_object_dir( root, name, attr, &completion_ops )))
 128     {
 129         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 130         {
 131             list_init( &completion->queue );
 132             completion->depth = 0;
 133         }
 134     }
 135
 136     return completion;
 137 }
 138
 139 struct completion *get_completion_obj( struct process *process, obj_handle_t handle, unsigned int access )
 140 {
 141     return (struct completion *) get_handle_obj( process, handle, access, &completion_ops );
 142 }
 143
 144 void add_completion( struct completion *completion, unsigned long ckey, unsigned long cvalue, unsigned int status, unsigned long information )
 145 {
 146     struct comp_msg *msg = mem_alloc( sizeof( *msg ) );
 147
 148     if (!msg)
 149         return;
 150
 151     msg->ckey = ckey;
 152     msg->cvalue = cvalue;
 153     msg->status = status;
 154     msg->information = information;
 155
 156     list_add_tail( &completion->queue, &msg->queue_entry );
 157     completion->depth++;
 158     wake_up( &completion->obj, 1 );
 159 }
 160
 161 /* create a completion */
 162 DECL_HANDLER(create_completion)
 163 {
 164     struct completion *completion;
 165     struct unicode_str name;
 166     struct directory *root = NULL;
 167
 168     reply->handle = 0;
 169
 170     get_req_unicode_str( &name );
 171     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 172         return;
 173
 174     if ( (completion = create_completion( root, &name, req->attributes, req->concurrent )) != NULL )
 175     {
 176         reply->handle = alloc_handle( current->process, completion, req->access, req->attributes );
 177         release_object( completion );
 178     }
 179
 180     if (root) release_object( root );
 181 }
 182
 183 /* open a completion */
 184 DECL_HANDLER(open_completion)
 185 {
 186     struct completion *completion;
 187     struct unicode_str name;
 188     struct directory *root = NULL;
 189
 190     reply->handle = 0;
 191
 192     get_req_unicode_str( &name );
 193     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 194         return;
 195
 196     if ( (completion = open_object_dir( root, &name, req->attributes, &completion_ops )) != NULL )
 197     {
 198         reply->handle = alloc_handle( current->process, completion, req->access, req->attributes );
 199         release_object( completion );
 200     }
 201
 202     if (root) release_object( root );
 203 }
 204
 205
 206 /* add completion to completion port */
 207 DECL_HANDLER(add_completion)
 208 {
 209     struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_MODIFY_STATE );
 210
 211     if (!completion) return;
 212
 213     add_completion( completion, req->ckey, req->cvalue, req->status, req->information );
 214
 215     release_object( completion );
 216 }
 217
 218 /* get completion from completion port */
 219 DECL_HANDLER(remove_completion)
 220 {
 221     struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_MODIFY_STATE );
 222     struct list *entry;
 223     struct comp_msg *msg;
 224
 225     if (!completion) return;
 226
 227     entry = list_head( &completion->queue );
 228     if (!entry)
 229         set_error( STATUS_PENDING );
 230     else
 231     {
 232         list_remove( entry );
 233         completion->depth--;
 234         msg = LIST_ENTRY( entry, struct comp_msg, queue_entry );
 235         reply->ckey = msg->ckey;
 236         reply->cvalue = msg->cvalue;
 237         reply->status = msg->status;
 238         reply->information = msg->information;
 239         free( msg );
 240     }
 241
 242     release_object( completion );
 243 }
 244
 245 /* get queue depth for completion port */
 246 DECL_HANDLER(query_completion)
 247 {
 248     struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_QUERY_STATE );
 249
 250     if (!completion) return;
 251
 252     reply->depth = completion->depth;
 253
 254     release_object( completion );
 255 }