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185 lines
5.4 KiB
C
185 lines
5.4 KiB
C
/*
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* Server-side mutex management
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*
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* Copyright (C) 1998 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "windef.h"
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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struct mutex
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{
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struct object obj; /* object header */
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struct thread *owner; /* mutex owner */
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unsigned int count; /* recursion count */
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int abandoned; /* has it been abandoned? */
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struct mutex *next;
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struct mutex *prev;
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};
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static void mutex_dump( struct object *obj, int verbose );
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static int mutex_signaled( struct object *obj, struct thread *thread );
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static int mutex_satisfied( struct object *obj, struct thread *thread );
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static void mutex_destroy( struct object *obj );
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static const struct object_ops mutex_ops =
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{
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sizeof(struct mutex), /* size */
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mutex_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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mutex_signaled, /* signaled */
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mutex_satisfied, /* satisfied */
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no_get_fd, /* get_fd */
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no_get_file_info, /* get_file_info */
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mutex_destroy /* destroy */
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};
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static struct mutex *create_mutex( const WCHAR *name, size_t len, int owned )
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{
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struct mutex *mutex;
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if ((mutex = create_named_object( sync_namespace, &mutex_ops, name, len )))
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{
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if (get_error() != STATUS_OBJECT_NAME_COLLISION)
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{
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/* initialize it if it didn't already exist */
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mutex->count = 0;
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mutex->owner = NULL;
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mutex->abandoned = 0;
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mutex->next = mutex->prev = NULL;
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if (owned) mutex_satisfied( &mutex->obj, current );
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}
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}
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return mutex;
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}
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/* release a mutex once the recursion count is 0 */
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static void do_release( struct mutex *mutex )
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{
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assert( !mutex->count );
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/* remove the mutex from the thread list of owned mutexes */
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if (mutex->next) mutex->next->prev = mutex->prev;
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if (mutex->prev) mutex->prev->next = mutex->next;
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else mutex->owner->mutex = mutex->next;
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mutex->owner = NULL;
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mutex->next = mutex->prev = NULL;
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wake_up( &mutex->obj, 0 );
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}
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void abandon_mutexes( struct thread *thread )
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{
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while (thread->mutex)
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{
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struct mutex *mutex = thread->mutex;
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assert( mutex->owner == thread );
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mutex->count = 0;
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mutex->abandoned = 1;
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do_release( mutex );
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}
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}
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static void mutex_dump( struct object *obj, int verbose )
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{
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struct mutex *mutex = (struct mutex *)obj;
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assert( obj->ops == &mutex_ops );
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fprintf( stderr, "Mutex count=%u owner=%p ", mutex->count, mutex->owner );
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dump_object_name( &mutex->obj );
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fputc( '\n', stderr );
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}
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static int mutex_signaled( struct object *obj, struct thread *thread )
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{
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struct mutex *mutex = (struct mutex *)obj;
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assert( obj->ops == &mutex_ops );
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return (!mutex->count || (mutex->owner == thread));
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}
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static int mutex_satisfied( struct object *obj, struct thread *thread )
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{
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struct mutex *mutex = (struct mutex *)obj;
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assert( obj->ops == &mutex_ops );
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assert( !mutex->count || (mutex->owner == thread) );
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if (!mutex->count++) /* FIXME: avoid wrap-around */
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{
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assert( !mutex->owner );
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mutex->owner = thread;
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mutex->prev = NULL;
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if ((mutex->next = thread->mutex)) mutex->next->prev = mutex;
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thread->mutex = mutex;
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}
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if (!mutex->abandoned) return 0;
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mutex->abandoned = 0;
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return 1;
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}
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static void mutex_destroy( struct object *obj )
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{
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struct mutex *mutex = (struct mutex *)obj;
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assert( obj->ops == &mutex_ops );
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if (!mutex->count) return;
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mutex->count = 0;
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do_release( mutex );
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}
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/* create a mutex */
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DECL_HANDLER(create_mutex)
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{
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struct mutex *mutex;
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reply->handle = 0;
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if ((mutex = create_mutex( get_req_data(), get_req_data_size(), req->owned )))
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{
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reply->handle = alloc_handle( current->process, mutex, MUTEX_ALL_ACCESS, req->inherit );
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release_object( mutex );
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}
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}
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/* open a handle to a mutex */
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DECL_HANDLER(open_mutex)
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{
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reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
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&mutex_ops, req->access, req->inherit );
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}
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/* release a mutex */
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DECL_HANDLER(release_mutex)
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{
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struct mutex *mutex;
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if ((mutex = (struct mutex *)get_handle_obj( current->process, req->handle,
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MUTEX_MODIFY_STATE, &mutex_ops )))
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{
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if (!mutex->count || (mutex->owner != current)) set_error( STATUS_MUTANT_NOT_OWNED );
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else if (!--mutex->count) do_release( mutex );
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release_object( mutex );
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}
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}
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