Fix bug #15933 with crashes in file-notify-tests on MS-Windows.

 Support w32 file notifications in batch mode.
 src/w32proc.c (sys_select): Don't wait on interrupt_handle if it is
 invalid (which happens in batch mode).  If non-interactive, call
 handle_file_notifications to store file notification events in the
 input queue.
 src/w32notify.c (send_notifications): Handle FRAME_INITIAL frames as
 well.
 src/w32inevt.c (handle_file_notifications): Now external, not
 static.
 src/w32term.h (handle_file_notifications): Provide prototype.
 src/emacs.c (main) [HAVE_W32NOTIFY]: When non-interactive, call
 init_crit, since init_display, which does that otherwise, is not
 called.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/w32notify.c b/src/w32notify.c
index 1f2ef83b2fd..373e20e8e92 100644
--- a/src/w32notify.c
+++ b/src/w32notify.c
@@ -163,7 +163,12 @@ send_notifications (BYTE *info, DWORD info_size, void *desc,
                && PostThreadMessage (dwMainThreadId, WM_EMACS_FILENOTIFY, 0, 0))
               || (FRAME_W32_P (f)
                   && PostMessage (FRAME_W32_WINDOW (f),
-                                  WM_EMACS_FILENOTIFY, 0, 0)))
+                                  WM_EMACS_FILENOTIFY, 0, 0))
+              /* When we are running in batch mode, there's no one to
+                 send a message, so we just signal the data is
+                 available and hope sys_select will be called soon and
+                 will read the data.  */
+              || (FRAME_INITIAL_P (f) && noninteractive))
             notification_buffer_in_use = 1;
           done = 1;
         }