d3d10core/tests: Remove dead code.
[wine.git] / server / mutex.c
blob3693095cefd52a7cf4df9f5e758c52c04d8560a3
1 /*
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
21 #include "config.h"
22 #include "wine/port.h"
24 #include <assert.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <stdarg.h>
29 #include "ntstatus.h"
30 #define WIN32_NO_STATUS
31 #include "windef.h"
32 #include "winternl.h"
34 #include "handle.h"
35 #include "thread.h"
36 #include "request.h"
37 #include "security.h"
39 struct mutex
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 struct object_type *mutex_get_type( struct object *obj );
50 static int mutex_signaled( struct object *obj, struct wait_queue_entry *entry );
51 static void mutex_satisfied( struct object *obj, struct wait_queue_entry *entry );
52 static unsigned int mutex_map_access( struct object *obj, unsigned int access );
53 static void mutex_destroy( struct object *obj );
54 static int mutex_signal( struct object *obj, unsigned int access );
56 static const struct object_ops mutex_ops =
58 sizeof(struct mutex), /* size */
59 mutex_dump, /* dump */
60 mutex_get_type, /* get_type */
61 add_queue, /* add_queue */
62 remove_queue, /* remove_queue */
63 mutex_signaled, /* signaled */
64 mutex_satisfied, /* satisfied */
65 mutex_signal, /* signal */
66 no_get_fd, /* get_fd */
67 mutex_map_access, /* map_access */
68 default_get_sd, /* get_sd */
69 default_set_sd, /* set_sd */
70 no_lookup_name, /* lookup_name */
71 directory_link_name, /* link_name */
72 default_unlink_name, /* unlink_name */
73 no_open_file, /* open_file */
74 no_close_handle, /* close_handle */
75 mutex_destroy /* destroy */
79 /* grab a mutex for a given thread */
80 static void do_grab( struct mutex *mutex, struct thread *thread )
82 assert( !mutex->count || (mutex->owner == thread) );
84 if (!mutex->count++) /* FIXME: avoid wrap-around */
86 assert( !mutex->owner );
87 mutex->owner = thread;
88 list_add_head( &thread->mutex_list, &mutex->entry );
92 /* release a mutex once the recursion count is 0 */
93 static void do_release( struct mutex *mutex )
95 assert( !mutex->count );
96 /* remove the mutex from the thread list of owned mutexes */
97 list_remove( &mutex->entry );
98 mutex->owner = NULL;
99 wake_up( &mutex->obj, 0 );
102 static struct mutex *create_mutex( struct object *root, const struct unicode_str *name,
103 unsigned int attr, int owned, const struct security_descriptor *sd )
105 struct mutex *mutex;
107 if ((mutex = create_named_object( root, &mutex_ops, name, attr, sd )))
109 if (get_error() != STATUS_OBJECT_NAME_EXISTS)
111 /* initialize it if it didn't already exist */
112 mutex->count = 0;
113 mutex->owner = NULL;
114 mutex->abandoned = 0;
115 if (owned) do_grab( mutex, current );
118 return mutex;
121 void abandon_mutexes( struct thread *thread )
123 struct list *ptr;
125 while ((ptr = list_head( &thread->mutex_list )) != NULL)
127 struct mutex *mutex = LIST_ENTRY( ptr, struct mutex, entry );
128 assert( mutex->owner == thread );
129 mutex->count = 0;
130 mutex->abandoned = 1;
131 do_release( mutex );
135 static void mutex_dump( struct object *obj, int verbose )
137 struct mutex *mutex = (struct mutex *)obj;
138 assert( obj->ops == &mutex_ops );
139 fprintf( stderr, "Mutex count=%u owner=%p\n", mutex->count, mutex->owner );
142 static struct object_type *mutex_get_type( struct object *obj )
144 static const WCHAR name[] = {'M','u','t','a','n','t'};
145 static const struct unicode_str str = { name, sizeof(name) };
146 return get_object_type( &str );
149 static int mutex_signaled( struct object *obj, struct wait_queue_entry *entry )
151 struct mutex *mutex = (struct mutex *)obj;
152 assert( obj->ops == &mutex_ops );
153 return (!mutex->count || (mutex->owner == get_wait_queue_thread( entry )));
156 static void mutex_satisfied( struct object *obj, struct wait_queue_entry *entry )
158 struct mutex *mutex = (struct mutex *)obj;
159 assert( obj->ops == &mutex_ops );
161 do_grab( mutex, get_wait_queue_thread( entry ));
162 if (mutex->abandoned) make_wait_abandoned( entry );
163 mutex->abandoned = 0;
166 static unsigned int mutex_map_access( struct object *obj, unsigned int access )
168 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | MUTANT_QUERY_STATE;
169 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE;
170 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE;
171 if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL | MUTEX_ALL_ACCESS;
172 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
175 static int mutex_signal( struct object *obj, unsigned int access )
177 struct mutex *mutex = (struct mutex *)obj;
178 assert( obj->ops == &mutex_ops );
180 if (!(access & SYNCHRONIZE))
182 set_error( STATUS_ACCESS_DENIED );
183 return 0;
185 if (!mutex->count || (mutex->owner != current))
187 set_error( STATUS_MUTANT_NOT_OWNED );
188 return 0;
190 if (!--mutex->count) do_release( mutex );
191 return 1;
194 static void mutex_destroy( struct object *obj )
196 struct mutex *mutex = (struct mutex *)obj;
197 assert( obj->ops == &mutex_ops );
199 if (!mutex->count) return;
200 mutex->count = 0;
201 do_release( mutex );
204 /* create a mutex */
205 DECL_HANDLER(create_mutex)
207 struct mutex *mutex;
208 struct unicode_str name;
209 struct object *root;
210 const struct security_descriptor *sd;
211 const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
213 if (!objattr) return;
215 if ((mutex = create_mutex( root, &name, objattr->attributes, req->owned, sd )))
217 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
218 reply->handle = alloc_handle( current->process, mutex, req->access, objattr->attributes );
219 else
220 reply->handle = alloc_handle_no_access_check( current->process, mutex,
221 req->access, objattr->attributes );
222 release_object( mutex );
225 if (root) release_object( root );
228 /* open a handle to a mutex */
229 DECL_HANDLER(open_mutex)
231 struct unicode_str name = get_req_unicode_str();
233 reply->handle = open_object( current->process, req->rootdir, req->access,
234 &mutex_ops, &name, req->attributes );
237 /* release a mutex */
238 DECL_HANDLER(release_mutex)
240 struct mutex *mutex;
242 if ((mutex = (struct mutex *)get_handle_obj( current->process, req->handle,
243 0, &mutex_ops )))
245 if (!mutex->count || (mutex->owner != current)) set_error( STATUS_MUTANT_NOT_OWNED );
246 else
248 reply->prev_count = mutex->count;
249 if (!--mutex->count) do_release( mutex );
251 release_object( mutex );