2 * Server-side mutex management
4 * Copyright (C) 1998 Alexandre Julliard
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.
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.
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
22 #include "wine/port.h"
30 #define WIN32_NO_STATUS
41 struct object obj; /* object header */
42 struct thread *owner; /* mutex owner */
43 unsigned int count; /* recursion count */
44 int abandoned; /* has it been abandoned? */
45 struct list entry; /* entry in owner thread mutex list */
48 static void mutex_dump( struct object *obj, int verbose );
49 static int mutex_signaled( struct object *obj, struct thread *thread );
50 static int mutex_satisfied( struct object *obj, struct thread *thread );
51 static unsigned int mutex_map_access( struct object *obj, unsigned int access );
52 static void mutex_destroy( struct object *obj );
53 static int mutex_signal( struct object *obj, unsigned int access );
55 static const struct object_ops mutex_ops =
57 sizeof(struct mutex), /* size */
58 mutex_dump, /* dump */
59 add_queue, /* add_queue */
60 remove_queue, /* remove_queue */
61 mutex_signaled, /* signaled */
62 mutex_satisfied, /* satisfied */
63 mutex_signal, /* signal */
64 no_get_fd, /* get_fd */
65 mutex_map_access, /* map_access */
66 default_get_sd, /* get_sd */
67 default_set_sd, /* set_sd */
68 no_lookup_name, /* lookup_name */
69 no_open_file, /* open_file */
70 no_close_handle, /* close_handle */
71 mutex_destroy /* destroy */
75 static struct mutex *create_mutex( struct directory *root, const struct unicode_str *name,
76 unsigned int attr, int owned, const struct security_descriptor *sd )
80 if ((mutex = create_named_object_dir( root, name, attr, &mutex_ops )))
82 if (get_error() != STATUS_OBJECT_NAME_EXISTS)
84 /* initialize it if it didn't already exist */
88 if (owned) mutex_satisfied( &mutex->obj, current );
89 if (sd) default_set_sd( &mutex->obj, sd, OWNER_SECURITY_INFORMATION|
90 GROUP_SECURITY_INFORMATION|
91 DACL_SECURITY_INFORMATION|
92 SACL_SECURITY_INFORMATION );
98 /* release a mutex once the recursion count is 0 */
99 static void do_release( struct mutex *mutex )
101 assert( !mutex->count );
102 /* remove the mutex from the thread list of owned mutexes */
103 list_remove( &mutex->entry );
105 wake_up( &mutex->obj, 0 );
108 void abandon_mutexes( struct thread *thread )
112 while ((ptr = list_head( &thread->mutex_list )) != NULL)
114 struct mutex *mutex = LIST_ENTRY( ptr, struct mutex, entry );
115 assert( mutex->owner == thread );
117 mutex->abandoned = 1;
122 static void mutex_dump( struct object *obj, int verbose )
124 struct mutex *mutex = (struct mutex *)obj;
125 assert( obj->ops == &mutex_ops );
126 fprintf( stderr, "Mutex count=%u owner=%p ", mutex->count, mutex->owner );
127 dump_object_name( &mutex->obj );
128 fputc( '\n', stderr );
131 static int mutex_signaled( struct object *obj, struct thread *thread )
133 struct mutex *mutex = (struct mutex *)obj;
134 assert( obj->ops == &mutex_ops );
135 return (!mutex->count || (mutex->owner == thread));
138 static int mutex_satisfied( struct object *obj, struct thread *thread )
140 struct mutex *mutex = (struct mutex *)obj;
141 assert( obj->ops == &mutex_ops );
142 assert( !mutex->count || (mutex->owner == thread) );
144 if (!mutex->count++) /* FIXME: avoid wrap-around */
146 assert( !mutex->owner );
147 mutex->owner = thread;
148 list_add_head( &thread->mutex_list, &mutex->entry );
150 if (!mutex->abandoned) return 0;
151 mutex->abandoned = 0;
155 static unsigned int mutex_map_access( struct object *obj, unsigned int access )
157 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SYNCHRONIZE;
158 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | MUTEX_MODIFY_STATE;
159 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
160 if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL | MUTEX_ALL_ACCESS;
161 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
164 static int mutex_signal( struct object *obj, unsigned int access )
166 struct mutex *mutex = (struct mutex *)obj;
167 assert( obj->ops == &mutex_ops );
169 if (!(access & SYNCHRONIZE)) /* FIXME: MUTEX_MODIFY_STATE? */
171 set_error( STATUS_ACCESS_DENIED );
174 if (!mutex->count || (mutex->owner != current))
176 set_error( STATUS_MUTANT_NOT_OWNED );
179 if (!--mutex->count) do_release( mutex );
183 static void mutex_destroy( struct object *obj )
185 struct mutex *mutex = (struct mutex *)obj;
186 assert( obj->ops == &mutex_ops );
188 if (!mutex->count) return;
194 DECL_HANDLER(create_mutex)
197 struct unicode_str name;
198 struct directory *root = NULL;
199 const struct object_attributes *objattr = get_req_data();
200 const struct security_descriptor *sd;
204 if (!objattr_is_valid( objattr, get_req_data_size() ))
207 sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
208 objattr_get_name( objattr, &name );
210 if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 )))
213 if ((mutex = create_mutex( root, &name, req->attributes, req->owned, sd )))
215 reply->handle = alloc_handle( current->process, mutex, req->access, req->attributes );
216 release_object( mutex );
219 if (root) release_object( root );
222 /* open a handle to a mutex */
223 DECL_HANDLER(open_mutex)
225 struct unicode_str name;
226 struct directory *root = NULL;
229 get_req_unicode_str( &name );
230 if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
233 if ((mutex = open_object_dir( root, &name, req->attributes, &mutex_ops )))
235 reply->handle = alloc_handle( current->process, &mutex->obj, req->access, req->attributes );
236 release_object( mutex );
239 if (root) release_object( root );
242 /* release a mutex */
243 DECL_HANDLER(release_mutex)
247 if ((mutex = (struct mutex *)get_handle_obj( current->process, req->handle,
248 MUTEX_MODIFY_STATE, &mutex_ops )))
250 if (!mutex->count || (mutex->owner != current)) set_error( STATUS_MUTANT_NOT_OWNED );
253 reply->prev_count = mutex->count;
254 if (!--mutex->count) do_release( mutex );
256 release_object( mutex );