Commit a8675531 authored by Alexandre Julliard's avatar Alexandre Julliard

server: Use the standard file descriptor signal mechanism for directory changes.

parent ba896e75
......@@ -2178,15 +2178,6 @@ static void WINAPI read_changes_apc( void *user, PIO_STATUS_BLOCK iosb, ULONG st
TRACE("%p %p %08x\n", info, iosb, status);
/*
* FIXME: race me!
*
* hEvent/hDir is set before the output buffer and iosb is updated.
* Since the thread that called NtNotifyChangeDirectoryFile is usually
* waiting, we'll be safe since we're called in that thread's context.
* If a different thread is waiting on our hEvent/hDir we're going to be
* in trouble...
*/
SERVER_START_REQ( read_change )
{
req->handle = info->FileHandle;
......
......@@ -147,11 +147,9 @@ struct dir
struct object obj; /* object header */
struct fd *fd; /* file descriptor to the directory */
struct list entry; /* entry in global change notifications list */
struct event *event;
unsigned int filter; /* notification filter */
int notified; /* SIGIO counter */
int want_data; /* return change data */
long signaled; /* the file changed */
int subtree; /* do we want to watch subdirectories? */
struct list change_records; /* data for the change */
struct list in_entry; /* entry in the inode dirs list */
......@@ -162,7 +160,6 @@ static struct fd *dir_get_fd( struct object *obj );
static unsigned int dir_map_access( struct object *obj, unsigned int access );
static void dir_dump( struct object *obj, int verbose );
static void dir_destroy( struct object *obj );
static int dir_signaled( struct object *obj, struct thread *thread );
static const struct object_ops dir_ops =
{
......@@ -170,7 +167,7 @@ static const struct object_ops dir_ops =
dir_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
dir_signaled, /* signaled */
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
dir_get_fd, /* get_fd */
......@@ -254,15 +251,7 @@ static void dir_dump( struct object *obj, int verbose )
{
struct dir *dir = (struct dir *)obj;
assert( obj->ops == &dir_ops );
fprintf( stderr, "Dirfile fd=%p event=%p filter=%08x\n",
dir->fd, dir->event, dir->filter );
}
static int dir_signaled( struct object *obj, struct thread *thread )
{
struct dir *dir = (struct dir *)obj;
assert (obj->ops == &dir_ops);
return (dir->event == NULL) && dir->signaled;
fprintf( stderr, "Dirfile fd=%p filter=%08x\n", dir->fd, dir->filter );
}
/* enter here directly from SIGIO signal handler */
......@@ -279,11 +268,6 @@ void do_change_notify( int unix_fd )
}
}
static void dir_signal_changed( struct dir *dir )
{
if (!dir->event) wake_up( &dir->obj, 0 );
}
/* SIGIO callback, called synchronously with the poll loop */
void sigio_callback(void)
{
......@@ -291,13 +275,8 @@ void sigio_callback(void)
LIST_FOR_EACH_ENTRY( dir, &change_list, struct dir, entry )
{
long count = interlocked_xchg( &dir->notified, 0 );
if (count)
{
dir->signaled += count;
if (dir->signaled == count) /* was it 0? */
dir_signal_changed( dir );
}
if (interlocked_xchg( &dir->notified, 0 ))
fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_NOTIFY_ENUM_DIR );
}
}
......@@ -342,7 +321,6 @@ static void dir_destroy( struct object *obj )
while ((record = get_first_change_record( dir ))) free( record );
if (dir->event) release_object( dir->event );
release_object( dir->fd );
if (inotify_fd && list_empty( &change_list ))
......@@ -1038,10 +1016,8 @@ struct object *create_dir_obj( struct fd *fd )
return NULL;
list_init( &dir->change_records );
dir->event = NULL;
dir->filter = 0;
dir->notified = 0;
dir->signaled = 0;
dir->want_data = 0;
dir->inode = NULL;
grab_object( fd );
......@@ -1056,7 +1032,6 @@ struct object *create_dir_obj( struct fd *fd )
/* enable change notifications for a directory */
DECL_HANDLER(read_directory_changes)
{
struct event *event = NULL;
struct dir *dir;
struct async *async;
......@@ -1070,15 +1045,6 @@ DECL_HANDLER(read_directory_changes)
if (!dir)
return;
/* possibly send changes through an event flag */
if (req->async.event &&
!(event = get_event_obj( current->process, req->async.event, EVENT_MODIFY_STATE )))
goto end;
/* discard the current data, and move onto the next event */
if (dir->event) release_object( dir->event );
dir->event = event;
/* requests don't timeout */
if (!(async = fd_queue_async( dir->fd, &req->async, ASYNC_TYPE_WAIT, 0 ))) goto end;
......@@ -1092,10 +1058,6 @@ DECL_HANDLER(read_directory_changes)
dir->want_data = req->want_data;
}
/* remove any notifications */
if (dir->signaled>0)
dir->signaled--;
/* if there's already a change in the queue, send it */
if (!list_empty( &dir->change_records ))
fd_async_wake_up( dir->fd, ASYNC_TYPE_WAIT, STATUS_ALERTED );
......@@ -1129,9 +1091,5 @@ DECL_HANDLER(read_change)
else
set_error( STATUS_NO_DATA_DETECTED );
/* now signal it */
dir->signaled++;
dir_signal_changed( dir );
release_object( dir );
}
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