server: Introduce async_is_blocking helper and use it in sock_ioctl.

server/async.c

@@ -472,6 +472,11 @@ struct iosb *async_get_iosb( struct async *async )
     return async->iosb ? (struct iosb *)grab_object( async->iosb ) : NULL;
 }
 
+int async_is_blocking( struct async *async )
+{
+    return !async->event && !async->data.apc && !async->data.apc_context;
+}
+
 /* find the first pending async in queue */
 struct async *find_pending_async( struct async_queue *queue )
 {

server/file.h

@@ -187,6 +187,7 @@ extern struct completion *fd_get_completion( struct fd *fd, apc_param_t *p_key )
 extern void fd_copy_completion( struct fd *src, struct fd *dst );
 extern struct iosb *create_iosb( const void *in_data, data_size_t in_size, data_size_t out_size );
 extern struct iosb *async_get_iosb( struct async *async );
+extern int async_is_blocking( struct async *async );
 extern struct async *find_pending_async( struct async_queue *queue );
 extern void cancel_process_asyncs( struct process *process );
 

server/sock.c

@@ -545,14 +545,14 @@ obj_handle_t sock_ioctl( struct fd *fd, ioctl_code_t code, struct async *async,
     switch(code)
     {
     case WS_SIO_ADDRESS_LIST_CHANGE:
-        if ((sock->state & FD_WINE_NONBLOCKING) && blocking)
+        if ((sock->state & FD_WINE_NONBLOCKING) && async_is_blocking( async ))
         {
             set_error( STATUS_CANT_WAIT );
             return 0;
         }
         if (!(ifchange_q = sock_get_ifchange_q( sock ))) return 0;
         queue_async( ifchange_q, async );
-        if (blocking) wait_handle = alloc_handle( current->process, async, SYNCHRONIZE, 0 );
+        if (async_is_blocking( async )) wait_handle = alloc_handle( current->process, async, SYNCHRONIZE, 0 );
         set_error( STATUS_PENDING );
         return wait_handle;
     default: