mirror of
https://github.com/reactos/wine.git
synced 2024-12-13 22:58:37 +00:00
277 lines
8.7 KiB
C
277 lines
8.7 KiB
C
/*
|
|
* Server-side mutex management
|
|
*
|
|
* Copyright (C) 1998 Alexandre Julliard
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "wine/port.h"
|
|
|
|
#include <assert.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdarg.h>
|
|
|
|
#include "ntstatus.h"
|
|
#define WIN32_NO_STATUS
|
|
#include "windef.h"
|
|
#include "winternl.h"
|
|
|
|
#include "handle.h"
|
|
#include "thread.h"
|
|
#include "request.h"
|
|
#include "security.h"
|
|
|
|
struct mutex
|
|
{
|
|
struct object obj; /* object header */
|
|
struct thread *owner; /* mutex owner */
|
|
unsigned int count; /* recursion count */
|
|
int abandoned; /* has it been abandoned? */
|
|
struct list entry; /* entry in owner thread mutex list */
|
|
};
|
|
|
|
static void mutex_dump( struct object *obj, int verbose );
|
|
static struct object_type *mutex_get_type( struct object *obj );
|
|
static int mutex_signaled( struct object *obj, struct wait_queue_entry *entry );
|
|
static void mutex_satisfied( struct object *obj, struct wait_queue_entry *entry );
|
|
static unsigned int mutex_map_access( struct object *obj, unsigned int access );
|
|
static void mutex_destroy( struct object *obj );
|
|
static int mutex_signal( struct object *obj, unsigned int access );
|
|
|
|
static const struct object_ops mutex_ops =
|
|
{
|
|
sizeof(struct mutex), /* size */
|
|
mutex_dump, /* dump */
|
|
mutex_get_type, /* get_type */
|
|
add_queue, /* add_queue */
|
|
remove_queue, /* remove_queue */
|
|
mutex_signaled, /* signaled */
|
|
mutex_satisfied, /* satisfied */
|
|
mutex_signal, /* signal */
|
|
no_get_fd, /* get_fd */
|
|
mutex_map_access, /* map_access */
|
|
default_get_sd, /* get_sd */
|
|
default_set_sd, /* set_sd */
|
|
no_lookup_name, /* lookup_name */
|
|
no_open_file, /* open_file */
|
|
no_close_handle, /* close_handle */
|
|
mutex_destroy /* destroy */
|
|
};
|
|
|
|
|
|
/* grab a mutex for a given thread */
|
|
static void do_grab( struct mutex *mutex, struct thread *thread )
|
|
{
|
|
assert( !mutex->count || (mutex->owner == thread) );
|
|
|
|
if (!mutex->count++) /* FIXME: avoid wrap-around */
|
|
{
|
|
assert( !mutex->owner );
|
|
mutex->owner = thread;
|
|
list_add_head( &thread->mutex_list, &mutex->entry );
|
|
}
|
|
}
|
|
|
|
/* release a mutex once the recursion count is 0 */
|
|
static void do_release( struct mutex *mutex )
|
|
{
|
|
assert( !mutex->count );
|
|
/* remove the mutex from the thread list of owned mutexes */
|
|
list_remove( &mutex->entry );
|
|
mutex->owner = NULL;
|
|
wake_up( &mutex->obj, 0 );
|
|
}
|
|
|
|
static struct mutex *create_mutex( struct directory *root, const struct unicode_str *name,
|
|
unsigned int attr, int owned, const struct security_descriptor *sd )
|
|
{
|
|
struct mutex *mutex;
|
|
|
|
if ((mutex = create_named_object_dir( root, name, attr, &mutex_ops )))
|
|
{
|
|
if (get_error() != STATUS_OBJECT_NAME_EXISTS)
|
|
{
|
|
/* initialize it if it didn't already exist */
|
|
mutex->count = 0;
|
|
mutex->owner = NULL;
|
|
mutex->abandoned = 0;
|
|
if (owned) do_grab( mutex, current );
|
|
if (sd) default_set_sd( &mutex->obj, sd, OWNER_SECURITY_INFORMATION|
|
|
GROUP_SECURITY_INFORMATION|
|
|
DACL_SECURITY_INFORMATION|
|
|
SACL_SECURITY_INFORMATION );
|
|
}
|
|
}
|
|
return mutex;
|
|
}
|
|
|
|
void abandon_mutexes( struct thread *thread )
|
|
{
|
|
struct list *ptr;
|
|
|
|
while ((ptr = list_head( &thread->mutex_list )) != NULL)
|
|
{
|
|
struct mutex *mutex = LIST_ENTRY( ptr, struct mutex, entry );
|
|
assert( mutex->owner == thread );
|
|
mutex->count = 0;
|
|
mutex->abandoned = 1;
|
|
do_release( mutex );
|
|
}
|
|
}
|
|
|
|
static void mutex_dump( struct object *obj, int verbose )
|
|
{
|
|
struct mutex *mutex = (struct mutex *)obj;
|
|
assert( obj->ops == &mutex_ops );
|
|
fprintf( stderr, "Mutex count=%u owner=%p ", mutex->count, mutex->owner );
|
|
dump_object_name( &mutex->obj );
|
|
fputc( '\n', stderr );
|
|
}
|
|
|
|
static struct object_type *mutex_get_type( struct object *obj )
|
|
{
|
|
static const WCHAR name[] = {'M','u','t','a','n','t'};
|
|
static const struct unicode_str str = { name, sizeof(name) };
|
|
return get_object_type( &str );
|
|
}
|
|
|
|
static int mutex_signaled( struct object *obj, struct wait_queue_entry *entry )
|
|
{
|
|
struct mutex *mutex = (struct mutex *)obj;
|
|
assert( obj->ops == &mutex_ops );
|
|
return (!mutex->count || (mutex->owner == get_wait_queue_thread( entry )));
|
|
}
|
|
|
|
static void mutex_satisfied( struct object *obj, struct wait_queue_entry *entry )
|
|
{
|
|
struct mutex *mutex = (struct mutex *)obj;
|
|
assert( obj->ops == &mutex_ops );
|
|
|
|
do_grab( mutex, get_wait_queue_thread( entry ));
|
|
if (mutex->abandoned) make_wait_abandoned( entry );
|
|
mutex->abandoned = 0;
|
|
}
|
|
|
|
static unsigned int mutex_map_access( struct object *obj, unsigned int access )
|
|
{
|
|
if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ;
|
|
if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE;
|
|
if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SYNCHRONIZE;
|
|
if (access & GENERIC_ALL) access |= STANDARD_RIGHTS_ALL | MUTEX_ALL_ACCESS;
|
|
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
|
|
}
|
|
|
|
static int mutex_signal( struct object *obj, unsigned int access )
|
|
{
|
|
struct mutex *mutex = (struct mutex *)obj;
|
|
assert( obj->ops == &mutex_ops );
|
|
|
|
if (!(access & SYNCHRONIZE))
|
|
{
|
|
set_error( STATUS_ACCESS_DENIED );
|
|
return 0;
|
|
}
|
|
if (!mutex->count || (mutex->owner != current))
|
|
{
|
|
set_error( STATUS_MUTANT_NOT_OWNED );
|
|
return 0;
|
|
}
|
|
if (!--mutex->count) do_release( mutex );
|
|
return 1;
|
|
}
|
|
|
|
static void mutex_destroy( struct object *obj )
|
|
{
|
|
struct mutex *mutex = (struct mutex *)obj;
|
|
assert( obj->ops == &mutex_ops );
|
|
|
|
if (!mutex->count) return;
|
|
mutex->count = 0;
|
|
do_release( mutex );
|
|
}
|
|
|
|
/* create a mutex */
|
|
DECL_HANDLER(create_mutex)
|
|
{
|
|
struct mutex *mutex;
|
|
struct unicode_str name;
|
|
struct directory *root = NULL;
|
|
const struct object_attributes *objattr = get_req_data();
|
|
const struct security_descriptor *sd;
|
|
|
|
reply->handle = 0;
|
|
|
|
if (!objattr_is_valid( objattr, get_req_data_size() ))
|
|
return;
|
|
|
|
sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
|
|
objattr_get_name( objattr, &name );
|
|
|
|
if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 )))
|
|
return;
|
|
|
|
if ((mutex = create_mutex( root, &name, req->attributes, req->owned, sd )))
|
|
{
|
|
if (get_error() == STATUS_OBJECT_NAME_EXISTS)
|
|
reply->handle = alloc_handle( current->process, mutex, req->access, req->attributes );
|
|
else
|
|
reply->handle = alloc_handle_no_access_check( current->process, mutex, req->access, req->attributes );
|
|
release_object( mutex );
|
|
}
|
|
|
|
if (root) release_object( root );
|
|
}
|
|
|
|
/* open a handle to a mutex */
|
|
DECL_HANDLER(open_mutex)
|
|
{
|
|
struct unicode_str name;
|
|
struct directory *root = NULL;
|
|
struct mutex *mutex;
|
|
|
|
get_req_unicode_str( &name );
|
|
if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
|
|
return;
|
|
|
|
if ((mutex = open_object_dir( root, &name, req->attributes, &mutex_ops )))
|
|
{
|
|
reply->handle = alloc_handle( current->process, &mutex->obj, req->access, req->attributes );
|
|
release_object( mutex );
|
|
}
|
|
|
|
if (root) release_object( root );
|
|
}
|
|
|
|
/* release a mutex */
|
|
DECL_HANDLER(release_mutex)
|
|
{
|
|
struct mutex *mutex;
|
|
|
|
if ((mutex = (struct mutex *)get_handle_obj( current->process, req->handle,
|
|
0, &mutex_ops )))
|
|
{
|
|
if (!mutex->count || (mutex->owner != current)) set_error( STATUS_MUTANT_NOT_OWNED );
|
|
else
|
|
{
|
|
reply->prev_count = mutex->count;
|
|
if (!--mutex->count) do_release( mutex );
|
|
}
|
|
release_object( mutex );
|
|
}
|
|
}
|