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server: Use the standard file descriptor signal mechanism for directory changes.
This commit is contained in:
Alexandre Julliard
parent
ba896e75d7
commit
a867553146
2 changed files with 4 additions and 55 deletions
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@ -2178,15 +2178,6 @@ static void WINAPI read_changes_apc( void *user, PIO_STATUS_BLOCK iosb, ULONG st
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TRACE("%p %p %08x\n", info, iosb, status);
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/*
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* FIXME: race me!
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*
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* hEvent/hDir is set before the output buffer and iosb is updated.
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* Since the thread that called NtNotifyChangeDirectoryFile is usually
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* waiting, we'll be safe since we're called in that thread's context.
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* If a different thread is waiting on our hEvent/hDir we're going to be
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* in trouble...
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*/
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SERVER_START_REQ( read_change )
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{
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req->handle = info->FileHandle;
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@ -147,11 +147,9 @@ struct dir
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struct object obj; /* object header */
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struct fd *fd; /* file descriptor to the directory */
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struct list entry; /* entry in global change notifications list */
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struct event *event;
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unsigned int filter; /* notification filter */
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int notified; /* SIGIO counter */
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int want_data; /* return change data */
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long signaled; /* the file changed */
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int subtree; /* do we want to watch subdirectories? */
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struct list change_records; /* data for the change */
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struct list in_entry; /* entry in the inode dirs list */
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@ -162,7 +160,6 @@ static struct fd *dir_get_fd( struct object *obj );
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static unsigned int dir_map_access( struct object *obj, unsigned int access );
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static void dir_dump( struct object *obj, int verbose );
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static void dir_destroy( struct object *obj );
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static int dir_signaled( struct object *obj, struct thread *thread );
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static const struct object_ops dir_ops =
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{
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@ -170,7 +167,7 @@ static const struct object_ops dir_ops =
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dir_dump, /* dump */
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add_queue, /* add_queue */
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remove_queue, /* remove_queue */
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dir_signaled, /* signaled */
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default_fd_signaled, /* signaled */
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no_satisfied, /* satisfied */
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no_signal, /* signal */
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dir_get_fd, /* get_fd */
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@ -254,15 +251,7 @@ static void dir_dump( struct object *obj, int verbose )
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{
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struct dir *dir = (struct dir *)obj;
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assert( obj->ops == &dir_ops );
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fprintf( stderr, "Dirfile fd=%p event=%p filter=%08x\n",
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dir->fd, dir->event, dir->filter );
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}
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static int dir_signaled( struct object *obj, struct thread *thread )
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{
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struct dir *dir = (struct dir *)obj;
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assert (obj->ops == &dir_ops);
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return (dir->event == NULL) && dir->signaled;
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fprintf( stderr, "Dirfile fd=%p filter=%08x\n", dir->fd, dir->filter );
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}
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/* enter here directly from SIGIO signal handler */
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@ -279,11 +268,6 @@ void do_change_notify( int unix_fd )
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}
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}
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static void dir_signal_changed( struct dir *dir )
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{
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if (!dir->event) wake_up( &dir->obj, 0 );
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}
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/* SIGIO callback, called synchronously with the poll loop */
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void sigio_callback(void)
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{
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@ -291,13 +275,8 @@ void sigio_callback(void)
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LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
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{
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long count = interlocked_xchg( &dir->notified, 0 );
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if (count)
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{
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dir->signaled += count;
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if (dir->signaled == count) /* was it 0? */
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dir_signal_changed( dir );
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}
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if (interlocked_xchg( &dir->notified, 0 ))
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fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_NOTIFY_ENUM_DIR );
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}
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}
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@ -342,7 +321,6 @@ static void dir_destroy( struct object *obj )
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while ((record = get_first_change_record( dir ))) free( record );
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if (dir->event) release_object( dir->event );
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release_object( dir->fd );
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if (inotify_fd && list_empty( &change_list ))
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@ -1038,10 +1016,8 @@ struct object *create_dir_obj( struct fd *fd )
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return NULL;
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list_init( &dir->change_records );
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dir->event = NULL;
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dir->filter = 0;
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dir->notified = 0;
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dir->signaled = 0;
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dir->want_data = 0;
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dir->inode = NULL;
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grab_object( fd );
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@ -1056,7 +1032,6 @@ struct object *create_dir_obj( struct fd *fd )
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/* enable change notifications for a directory */
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DECL_HANDLER(read_directory_changes)
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{
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struct event *event = NULL;
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struct dir *dir;
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struct async *async;
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@ -1070,15 +1045,6 @@ DECL_HANDLER(read_directory_changes)
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if (!dir)
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return;
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/* possibly send changes through an event flag */
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if (req->async.event &&
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!(event = get_event_obj( current->process, req->async.event, EVENT_MODIFY_STATE )))
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goto end;
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/* discard the current data, and move onto the next event */
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if (dir->event) release_object( dir->event );
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dir->event = event;
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/* requests don't timeout */
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if (!(async = fd_queue_async( dir->fd, &req->async, ASYNC_TYPE_WAIT, 0 ))) goto end;
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@ -1092,10 +1058,6 @@ DECL_HANDLER(read_directory_changes)
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dir->want_data = req->want_data;
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}
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/* remove any notifications */
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if (dir->signaled>0)
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dir->signaled--;
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/* if there's already a change in the queue, send it */
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if (!list_empty( &dir->change_records ))
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fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
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@ -1129,9 +1091,5 @@ DECL_HANDLER(read_change)
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else
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set_error( STATUS_NO_DATA_DETECTED );
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/* now signal it */
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dir->signaled++;
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dir_signal_changed( dir );
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release_object( dir );
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}
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