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 int completion_signaled( struct object *obj, struct wait_queue_entry *entry );
  57 static unsigned int completion_map_access( struct object *obj, unsigned int access );
  58 static void completion_destroy( struct object * );
  59
  60 static const struct object_ops completion_ops =
  61 {
  62     sizeof(struct completion), /* size */
  63     completion_dump,           /* dump */
  64     completion_get_type,       /* get_type */
  65     add_queue,                 /* add_queue */
  66     remove_queue,              /* remove_queue */
  67     completion_signaled,       /* signaled */
  68     no_satisfied,              /* satisfied */
  69     no_signal,                 /* signal */
  70     no_get_fd,                 /* get_fd */
  71     completion_map_access,     /* map_access */
  72     default_get_sd,            /* get_sd */
  73     default_set_sd,            /* set_sd */
  74     no_lookup_name,            /* lookup_name */
  75     no_open_file,              /* open_file */
  76     no_close_handle,           /* close_handle */
  77     completion_destroy         /* destroy */
  78 };
  79
  80 struct comp_msg
  81 {
  82     struct   list queue_entry;
  83     apc_param_t   ckey;
  84     apc_param_t   cvalue;
  85     apc_param_t   information;
  86     unsigned int  status;
  87 };
  88
  89 static void completion_destroy( struct object *obj)
  90 {
  91     struct completion *completion = (struct completion *) obj;
  92     struct comp_msg *tmp, *next;
  93
  94     LIST_FOR_EACH_ENTRY_SAFE( tmp, next, &completion->queue, struct comp_msg, queue_entry )
  95     {
  96         free( tmp );
  97     }
  98 }
  99
 100 static void completion_dump( struct object *obj, int verbose )
 101 {
 102     struct completion *completion = (struct completion *) obj;
 103
 104     assert( obj->ops == &completion_ops );
 105     fprintf( stderr, "Completion " );
 106     dump_object_name( &completion->obj );
 107     fprintf( stderr, " (%u packets pending)\n", completion->depth );
 108 }
 109
 110 static struct object_type *completion_get_type( struct object *obj )
 111 {
 112     static const WCHAR name[] = {'C','o','m','p','l','e','t','i','o','n'};
 113     static const struct unicode_str str = { name, sizeof(name) };
 114     return get_object_type( &str );
 115 }
 116
 117 static int completion_signaled( struct object *obj, struct wait_queue_entry *entry )
 118 {
 119     struct completion *completion = (struct completion *)obj;
 120
 121     return !list_empty( &completion->queue );
 122 }
 123
 124 static unsigned int completion_map_access( struct object *obj, unsigned int access )
 125 {
 126     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SYNCHRONIZE | IO_COMPLETION_QUERY_STATE;
 127     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE;
 128     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 129     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_ALL | IO_COMPLETION_ALL_ACCESS;
 130     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 131 }
 132
 133 static struct completion *create_completion( struct directory *root, const struct unicode_str *name, unsigned int attr, unsigned int concurrent )
 134 {
 135     struct completion *completion;
 136
 137     if ((completion = create_named_object_dir( root, name, attr, &completion_ops )))
 138     {
 139         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 140         {
 141             list_init( &completion->queue );
 142             completion->depth = 0;
 143         }
 144     }
 145
 146     return completion;
 147 }
 148
 149 struct completion *get_completion_obj( struct process *process, obj_handle_t handle, unsigned int access )
 150 {
 151     return (struct completion *) get_handle_obj( process, handle, access, &completion_ops );
 152 }
 153
 154 void add_completion( struct completion *completion, apc_param_t ckey, apc_param_t cvalue,
 155                      unsigned int status, apc_param_t information )
 156 {
 157     struct comp_msg *msg = mem_alloc( sizeof( *msg ) );
 158
 159     if (!msg)
 160         return;
 161
 162     msg->ckey = ckey;
 163     msg->cvalue = cvalue;
 164     msg->status = status;
 165     msg->information = information;
 166
 167     list_add_tail( &completion->queue, &msg->queue_entry );
 168     completion->depth++;
 169     wake_up( &completion->obj, 1 );
 170 }
 171
 172 /* create a completion */
 173 DECL_HANDLER(create_completion)
 174 {
 175     struct completion *completion;
 176     struct unicode_str name;
 177     struct directory *root = NULL;
 178
 179     reply->handle = 0;
 180
 181     get_req_unicode_str( &name );
 182     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 183         return;
 184
 185     if ( (completion = create_completion( root, &name, req->attributes, req->concurrent )) != NULL )
 186     {
 187         reply->handle = alloc_handle( current->process, completion, req->access, req->attributes );
 188         release_object( completion );
 189     }
 190
 191     if (root) release_object( root );
 192 }
 193
 194 /* open a completion */
 195 DECL_HANDLER(open_completion)
 196 {
 197     struct completion *completion;
 198     struct unicode_str name;
 199     struct directory *root = NULL;
 200
 201     reply->handle = 0;
 202
 203     get_req_unicode_str( &name );
 204     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 205         return;
 206
 207     if ( (completion = open_object_dir( root, &name, req->attributes, &completion_ops )) != NULL )
 208     {
 209         reply->handle = alloc_handle( current->process, completion, req->access, req->attributes );
 210         release_object( completion );
 211     }
 212
 213     if (root) release_object( root );
 214 }
 215
 216
 217 /* add completion to completion port */
 218 DECL_HANDLER(add_completion)
 219 {
 220     struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_MODIFY_STATE );
 221
 222     if (!completion) return;
 223
 224     add_completion( completion, req->ckey, req->cvalue, req->status, req->information );
 225
 226     release_object( completion );
 227 }
 228
 229 /* get completion from completion port */
 230 DECL_HANDLER(remove_completion)
 231 {
 232     struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_MODIFY_STATE );
 233     struct list *entry;
 234     struct comp_msg *msg;
 235
 236     if (!completion) return;
 237
 238     entry = list_head( &completion->queue );
 239     if (!entry)
 240         set_error( STATUS_PENDING );
 241     else
 242     {
 243         list_remove( entry );
 244         completion->depth--;
 245         msg = LIST_ENTRY( entry, struct comp_msg, queue_entry );
 246         reply->ckey = msg->ckey;
 247         reply->cvalue = msg->cvalue;
 248         reply->status = msg->status;
 249         reply->information = msg->information;
 250         free( msg );
 251     }
 252
 253     release_object( completion );
 254 }
 255
 256 /* get queue depth for completion port */
 257 DECL_HANDLER(query_completion)
 258 {
 259     struct completion* completion = get_completion_obj( current->process, req->handle, IO_COMPLETION_QUERY_STATE );
 260
 261     if (!completion) return;
 262
 263     reply->depth = completion->depth;
 264
 265     release_object( completion );
 266 }