Re: Emacs routinely gets stuck in single_kboard mode

[Richard Stallman <rms@gnu.org>]

    Killing the sole frame on a certain display should exit single_kboard mode
    if it is enabled on tht display.

    Would someone like to implement that?

I decided to write it rather than wonder if someone would.
Does this fix it?  Add the following function to keyboard.c
and install the patch below.


/* If we're in single_kboard state for kboard KBOARD,
   get out of it.  */

void
not_single_kboard_state (kboard)
     KBOARD *kboard;
{
  if (kboard == current_kboard)
    single_kboard = 0;
}


*** frame.c	16 Nov 2003 20:36:24 -0500	1.306
--- frame.c	12 Jul 2004 16:55:02 -0400	
***************
*** 1327,1332 ****
--- 1327,1362 ----
  	}
      }
  
+   /* If there's no other frame on the same kboard, get out of
+      single-kboard state if we're in it for this kboard.  */
+   {
+     Lisp_Object frames;
+     /* Some frame we found on the same kboard, or nil if there are none.  */
+     Lisp_Object frame_on_same_kboard;
+ 
+     frame_on_same_kboard = Qnil;
+ 
+     for (frames = Vframe_list;
+ 	 CONSP (frames);
+ 	 frames = XCDR (frames))
+       {
+ 	Lisp_Object this;
+ 	struct frame *f1;
+ 
+ 	this = XCAR (frames);
+ 	if (!FRAMEP (this))
+ 	  abort ();
+ 	f1 = XFRAME (this);
+ 
+ 	if (FRAME_KBOARD (f) == FRAME_KBOARD (f1))
+ 	  frame_on_same_kboard = this;
+       }
+ 
+     if (NILP (frame_on_same_kboard))
+       not_single_kboard_state (FRAME_KBOARD (f));
+   }
+ 
+ 
    /* If we've deleted this keyboard's default_minibuffer_frame, try to
       find another one.  Prefer minibuffer-only frames, but also notice
       frames with other windows.  */