[xemacs-hg @ 2003-02-07 11:50:50 by ben] fixes for menu crashes + better preemption behavior This contains two related changes: (1) Fix problems with reentrant calling of lwlib and associated crashes when selecting menu items. (2) Improve redisplay handling of preemption. Turn on lazy lock and hold down page-down or page-up and you'll see what I mean. They are related because they both touch on the code that retrieves events and handles the internal queues. console-msw.h, event-msw.c, event-stream.c, events.h, menubar-msw.c, menubar-x.c, menubar.h: mswindows_protect_modal_loop() has been generalized to event_stream_protect_modal_loop(), and moved to event-stream.c. mswindows_in_modal_loop ->in_modal_loop likewise. Changes in event-msw.c and menubar-msw.c for the new names and calling format (use structures instead of static variables in menubar-msw.c). Delete former in_menu_callback and use in_modal_loop in its place. Remove emacs_mswindows_quit_check_disallowed_p(), superseded by in_modal_loop. Use event_stream_protect_modal_loop() in pre_activate_callback() so that we get no lwlib reentrancy. Rearrange some of the code in event-msw.c to be grouped better. Make mswindows_drain_windows_queue() respect in_modal_loop and do nothing if so. cmdloop.c, event-stream.c: Don't conditionalize on LWLIB_MENUBARS_LUCID when giving error when in_modal_loop, and give better error. event-Xt.c, event-gtk.c: If in_modal_loop, only retrieve process and timeout events. Don't retrieve any X events because processing them can lead to reentrancy in lwlib -> death. event-stream.c: Remove unused parameter to check_event_stream_ok() and change all callers. lisp.h, event-stream.c: Rearrange some functions for increased clarity -- in particular, group all the input-pending/QUIT-related stuff together, and put right next to next-event stuff, to which it's related. Add the concept of "HOW_MANY" -- when asking whether user input is pending, you can ask if at least HOW_MANY events are pending, not just if any are. Add parameter to detect_input_pending() for this. Change recursive_sit_for from a Lisp_Object (which could only be Qt or Qnil) to an int, like it should be. event-Xt.c, event-gtk.c, event-xlike-inc.c: New file. Abstract out similar code in event_{Xt/gtk}_pending_p() and write only once, using include-file tricks. Rewrite this function to implement HOW_MANY and only process events when not in_modal_loop. event-msw.c: Implement HOW_MANY and only process events when not in_modal_loop. event-tty.c: Implement HOW_MANY. redisplay.c: Add var `max-preempts' to control maximum number of preempts. (#### perhaps not useful) Rewrite preemption check so that, rather than preempting when any user events are available, only preempt when a certain number (currently 4) of them are backed up. This effectively allows redisplay to proceed to completion in the presence of a fast auto-repeat (usually the auto-repeating is generated dynamically as necessary), and you get much better display behavior with lazy-lock active. event-unixoid.c: Comment changes. event-stream.c: Rewrite discard-input much more simply and safely using the drain-queue functions. I think the old version might loop forever if called when in_modal_loop. SEMI-UNRELATED CHANGES: ----------------------- event-stream.c: Turn QUIT-checking back on when running the pre-idle hook so it can be quit out of. indent.c: Document exact functioning of `vertical-motion' better, and its differences from GNU Emacs.

/* Synched up with: FSF 19.31. */

/* system description file for Interactive (ISC) Unix version 2.2 on
   the 386.  */

#include "usg5-3.h"

/* select (in -linet) works okay on X ptys, but not on the serial port.
   karl@cs.umb.edu says that with that select call, subprocesses made by
   (e.g.) M-x grep don't exit cleanly, they just hang.  Similar problems
   have been observed in ISC 3.0.  */
#define BROKEN_SELECT_NON_X

/* karl@cs.umb.edu says that ISC's socket support (in -linet) isn't
   what Emacs needs; it makes interrupt-shell-subjob and the like do
   nothing.  But that appears to have been another manifestation of
   the broken select, so it should now be safe to define this again.  */
#define HAVE_SOCKETS

#define NO_SOCKETS_IN_FILE_SYSTEM
#define NEED_NET_ERRNO_H

/* This keeps the .cdbx section that gcc puts out when generating
   stabs-in-coff output, so Emacs can be debugged.  --karl@cs.umb.edu. */
#define USG_SHARED_LIBRARIES

#define NO_FCHMOD

#define MAXNAMLEN 512
#define O_NDELAY O_NONBLOCK
#define MEMORY_IN_STRING_H

/* Tell gmalloc.c that we don't have memmove (system include files to the
   contrary!). */
#define MEMMOVE_MISSING

/* -lPW is only needed if not using Gcc.  We used to include -lcposix here
   for the rename function, but some people say ISC's rename doesn't
   work correctly with Emacs so we use Emacs' emulation instead. */
#if defined (__GNUC__)
#  define LIB_STANDARD_1 -lcposix
#else /* !__GNUC__ */
#  define LIB_STANDARD_1 -lPW
#endif /* !__GNUC__ */

/* LIB_STANDARD_1 is used both here and in LIBS_SYSTEM
   (the latter for the sake of configure).  */
#define LIB_STANDARD LIB_STANDARD_1  -lc

#define NO_X_DESTROY_DATABASE

/* -linet may be needed to avoid undefined symbols such as gethostname,
   inet_addr, gethostbyname, socket, connect, ...  */
#define LIBS_SYSTEM -linet LIB_STANDARD_1

/* Inhibit asm code in netinet/in.h.  Strictly speaking, only necessary
   when -traditional is being used, but it doesn't hurt to
   unconditionally define this.  */
#define NO_ASM

/* -traditional is not necessary if the system header files are fixed to
   define getc and putc in the absence of _POSIX_SOURCE.  GCC's from 2.4.4
   on do this. */
#if !defined (__GNUC__) || __GNUC__ < 2
#  define C_SWITCH_SYSTEM "-traditional"
#endif

/* Some versions of ISC are said to define S_IFLNK even tho
   they don't really support symlinks.  */
#undef S_IFLNK