cannot thread-join the current thread

fix test suite for condition-variable-p name change

add tests for variable bindings

minor update to thread-join docs

minor documentation updates

document until-condition

first draft of threads documentation

rename condition-variablep to condition-variable-p

document process-thread and set-process-thread

pass the thread name to the OS if possible

use prctl to pass the thread name to the OS, if possible

add convenience macros with-mutex and until-condition

with-mutex is a safe way to run some code with a mutex held.
until-condition is a safe way to wait on a condition variable.

Merge from trunk

Make C-u C-x = report on empty overlays at point.

* lisp/descr-text.el (describe-text-properties-1): Use overlays-in to
report on empty overlays.

Fixes: debbugs:3322

Auto-commit of generated files.

Inline setter functions for Lisp_Objects slots of struct specbinding.
* eval.c (set_specpdl_symbol, set_specpdl_old_value): New functions.
Adjust users.

In select_window always make selected window's buffer current.

* window.c (select_window): Always make selected window's buffer
current.

Use AREF and ASET for docstrings of category tables.
* category.h (CATEGORY_DOCSTRING): Use AREF.
(SET_CATEGORY_DOCSTRING): Use ASET.
* category.c (Fdefine_category): Use SET_CATEGORY_DOCSTRING.

Inline setter functions for hash table members.
* lisp.h (set_hash_key, set_hash_value, set_hash_next)
(set_hash_hash, set_hash_index): Rename with _slot suffix.
(set_hash_key_and_value, set_hash_index, set_hash_next)
(set_hash_hash): New functions.
* charset.c, fns.c: Adjust users.

* lisp/mail/rmailout.el (rmail-output-read-file-name): Trap errors
in rmail-output-file-alist elements, and report them.

Inline getter and setter functions for per-buffer values.
* buffer.h (per_buffer_default, set_per_buffer_default)
(per_buffer_value, set_per_buffer_value): New functions.
(PER_BUFFER_VALUE, PER_BUFFER_DEFAULT): Remove.
* buffer.c, data.c: Adjust users.

* lisp/font-lock.el (font-lock-add-keywords): Doc fix
(quote face names since most non-font-lock faces are not also variables).

* calendar/cal-tex.el (cal-tex-cursor-week-at-a-glance): New function.
(This is basically cal-tex-cursor-filofax-week with a different
papersize, mini-calendars, and color.)

Fixes: debbugs:12160

Clarify recent ChangeLog entry.

src/makefile.w32-in ($(BLD)/vm-limit.$(O)): Update dependencies.

Merge from gnulib.

2012-08-19 ignore-value, stat-time, timespec: omit AC_C_INLINE
2012-08-19 mktime, sys_select: avoid 'static inline'
2012-08-19 gnulib-tool: Fix indentation.

Rely on <unistd.h> to declare 'environ',

as gnulib does this if the system doesn't.
* lib-src/emacsclient.c (environ): Remove decl.
* src/callproc.c, src/editfns.c, src/process.c (environ) [!USE_CRT_DLL]:
* src/emacs.c (environ) [DOUG_LEA_MALLOC]:
* src/vm-limit.c (environ) [ORDINARY_LINK]: Remove decl.
* src/vm-limit.c: Include <unistd.h>, for 'environ'.

* unexaix.c, unexcoff.c: Include "mem-limits.h".

(start_of_data): Remove decl; mem-limits.h provides it.

* xdisp.c (handle_invisible_prop): Make it a bit faster

and avoid a gcc -Wmaybe-uninitialized diagnostic.

Fix previous rmail-output-read-file-name change

* lisp/mail/rmailout.el (rmail-output-read-file-name):
Fix previous change (when the alist is nil or does not match).

* src/xdisp.c (handle_invisible_prop): Fix ellipses at overlay string ends.

* test/redisplay-testsuite.el (test-redisplay): Use switch-to-buffer.

Fixes: debbugs:3874

* .gdbinit: Use call instead of set when calling a function in the
inferior.

another docstring fixlet

minor docstring fixup

add condition-mutex and condition-name

ensure name of a thread is a string

ensure name of a mutex is a string

use NILP

condition variables

This implements condition variables for elisp.
This needs more tests.

* data.c (set_internal): Don't use set_blv_found.
(Fkill_local_variable): Likewise.

* xml.el (xml-escape-string): Don't refer to xml-entity-alist.

Fixes: debbugs:12228

comment fixes

refactor systhread.h

This refactors systhread.h to move the notion of a "lisp mutex"
into thread.c.  This lets us make make the global lock and
post_acquire_global_lock static.

* nsfont.m (ns_ascii_average_width): Ensure the string
ascii_printable is initialized with a null-terminated character
array.  Otherwise, it can contain undesired extra characters.

port new setting code to Sun C 5.8 2005/10/13

* chartab.c, lisp.h (char_table_set, char_table_set_range):
Return void, not Lisp_Object.  Otherwise, the compiler
complains about (A?B:C) where B is void and C is Lisp_Object
when compiling CHAR_TABLE_SET, due to the recent change to
the API of sub_char_table_set_contents.

* lib/sigprocmask.c, m4/signalblocking.m4: Remove.

These files have been unused since the 2012-06-22 patch that
introduced high-resolution time stamps.

Make display strings obey buffer-invisibility-spec.

* src/xdisp.c (handle_invisible_prop): Obey TEXT_PROP_MEANS_INVISIBLE
for the string case.

* redisplay-testsuite.el (test-redisplay-4): New test.

Fixes: debbugs:3874

* buffer.h (BSET): Remove.

Replace all uses with calls to new setter functions.
(bset_bidi_paragraph_direction, bset_case_canon_table)
(bset_case_eqv_table, bset_directory, bset_display_count)
(bset_display_time, bset_downcase_table)
(bset_enable_multibyte_characters, bset_filename, bset_keymap)
(bset_last_selected_window, bset_local_var_alist)
(bset_mark_active, bset_point_before_scroll, bset_read_only)
(bset_truncate_lines, bset_undo_list, bset_upcase_table)
(bset_width_table):
* buffer.c (bset_abbrev_mode, bset_abbrev_table)
(bset_auto_fill_function, bset_auto_save_file_format)
(bset_auto_save_file_name, bset_backed_up, bset_begv_marker)
(bset_bidi_display_reordering, bset_buffer_file_coding_system)
(bset_cache_long_line_scans, bset_case_fold_search)
(bset_ctl_arrow, bset_cursor_in_non_selected_windows)
(bset_cursor_type, bset_display_table, bset_extra_line_spacing)
(bset_file_format, bset_file_truename, bset_fringe_cursor_alist)
(bset_fringe_indicator_alist, bset_fringes_outside_margins)
(bset_header_line_format, bset_indicate_buffer_boundaries)
(bset_indicate_empty_lines, bset_invisibility_spec)
(bset_left_fringe_width, bset_major_mode, bset_mark)
(bset_minor_modes, bset_mode_line_format, bset_mode_name)
(bset_name, bset_overwrite_mode, bset_pt_marker)
(bset_right_fringe_width, bset_save_length)
(bset_scroll_bar_width, bset_scroll_down_aggressively)
(bset_scroll_up_aggressively, bset_selective_display)
(bset_selective_display_ellipses, bset_vertical_scroll_bar_type)
(bset_word_wrap, bset_zv_marker):
* category.c (bset_category_table):
* syntax.c (bset_syntax_table):
New setter functions.

Fixes: debbugs:12215

Add yank-handled-properties; use it for `font-lock-face' and `category'
properties, instead of hard-coding these properties' special handling.

* lisp/simple.el (yank-handled-properties): New defcustom.
(yank-excluded-properties): Add font-lock-face and category.
(yank): Doc fix.

* lisp/subr.el (remove-yank-excluded-properties): Obey
yank-handled-properties.  The special handling of font-lock-face
and category is now done this way, instead of being hard-coded.
(insert-for-yank-1): Remove font-lock-face handling.
(yank-handle-font-lock-face-property)
(yank-handle-category-property): New function.

* process.h (PSET): Remove.

Replace all uses with calls to new setter functions.
Use INLINE_HEADER_BEGIN, INLINE_HEADER_END.
(PROCESS_INLINE): New macro.
(pset_childp): New setter function.
(pset_gnutls_cred_type) [HAVE_GNUTLS]: New setter function.
* process.c (PROCESS_INLINE):
Define to EXTERN_INLINE, so that the corresponding functions
are compiled into code.
(pset_buffer, pset_command, pset_decode_coding_system)
(pset_decoding_buf, pset_encode_coding_system)
(pset_encoding_buf, pset_filter, pset_log, pset_mark, pset_name)
(pset_plist, pset_sentinel, pset_status, pset_tty_name)
(pset_type, pset_write_queue): New setter functions.

Fixes: debbugs:12215

* window.h (WSET): Remove.

Replace all uses with calls to new setter functions.
Use INLINE_HEADER_BEGIN, INLINE_HEADER_END.
(WINDOW_INLINE): New macro.
(wset_buffer, wset_frame, wset_left_col, wset_next, wset_prev)
(wset_redisplay_end_trigger, wset_top_line, wset_total_cols)
(wset_total_lines, wset_vertical_scroll_bar)
(wset_window_end_pos, wset_window_end_valid)
(wset_window_end_vpos): New setter functions.
* window.c (WINDOW_INLINE):
Define to EXTERN_INLINE, so that the corresponding functions
are compiled into code.
(wset_combination_limit, wset_dedicated, wset_display_table)
(wset_hchild, wset_left_fringe_width, wset_left_margin_cols)
(wset_new_normal, wset_new_total, wset_next_buffers)
(wset_normal_cols, wset_normal_lines, wset_parent, wset_pointm)
(wset_prev_buffers, wset_right_fringe_width)
(wset_right_margin_cols, wset_scroll_bar_width, wset_start)
(wset_temslot, wset_vchild, wset_vertical_scroll_bar_type)
(wset_window_parameters):
* xdisp.c (wset_base_line_number, wset_base_line_pos)
(wset_column_number_displayed, wset_region_showing):
New setter functions.

Fixes: debbugs:12215

* termhooks.h (TSET): Remove.

Replace all uses with calls to new setter functions.
Use INLINE_HEADER_BEGIN, INLINE_HEADER_END.
(TERMHOOKS_INLINE): New macro.
(tset_charset_list, tset_selection_alist): New setter functions.
* terminal.c (TERMHOOKS_INLINE):
Define to EXTERN_INLINE, so that the corresponding functions
are compiled into code.
(tset_param_alist): New setter function.

Fixes: debbugs:12215

* keyboard.h (KSET): Remove.

Replace all uses with calls to new setter functions.
Use INLINE_HEADER_BEGIN, INLINE_HEADER_END.
(KEYBOARD_INLINE): New macro.
(kset_default_minibuffer_frame, kset_defining_kbd_macro)
(kset_input_decode_map, kset_last_command, kset_last_kbd_macro)
(kset_prefix_arg, kset_system_key_alist, kset_window_system):
New setter functions.
* keyboard.c (KEYBOARD_INLINE):
Define to EXTERN_INLINE, so that the corresponding functions
are compiled into code.
(kset_echo_string, kset_kbd_queue)
(kset_keyboard_translate_table, kset_last_prefix_arg)
(kset_last_repeatable_command, kset_local_function_key_map)
(kset_overriding_terminal_local_map, kset_real_last_command)
(kset_system_key_syms): New setter functions.

Fixes: debbugs:12215

* frame.h (FSET): Remove (Bug#12215).

Replace all uses with calls to new setter functions.
Use INLINE_HEADER_BEGIN, INLINE_HEADER_END.
(FRAME_INLINE): New macro.
(fset_buffer_list, fset_buried_buffer_list, fset_condemned_scroll_bars)
(fset_current_tool_bar_string, fset_desired_tool_bar_string)
(fset_face_alist, fset_focus_frame, fset_icon_name, fset_menu_bar_items)
(fset_menu_bar_vector, fset_menu_bar_window, fset_name)
(fset_param_alist, fset_root_window, fset_scroll_bars)
(fset_selected_window, fset_title, fset_tool_bar_items)
(fset_tool_bar_position, fset_tool_bar_window): New functions.
* frame.c (FRAME_INLINE):
Define to EXTERN_INLINE, so that the corresponding functions
are compiled into code.
(fset_buffer_predicate, fset_minibuffer_window): New setter functions.

A few more naming-convention fixes for getters and setters.

* buffer.c (set_buffer_overlays_before): Move here from buffer.h,
and rename from buffer_overlays_set_before.
(set_buffer_overlays_after): Move here from buffer.h, and rename
from buffer_overlays_set_after.
* buffer.h (buffer_intervals): Rename from buffer_get_intervals.
All uses changed.
(set_buffer_intervals): Rename from buffer_set_intervals.
* intervals.c (set_interval_object): Move here from intervals.h,
and rename from interval_set_object.
(set_interval_left): Move here from intervals.h, and rename from
interval_set_left.
(set_interval_right): Move here from intervals.h, and rename from
interval_set_right.
(copy_interval_parent): Move here from intervals.h, and rename from
interval_copy_parent.
* intervals.h (set_interval_parent): Rename from interval_set_parent.
(set_interval_plist): Rename from interval_set_plist.
Return void, not Lisp_Object, since no caller uses the result.
* lisp.h (string_intervals): Rename from string_get_intervals.
(set_string_intervals): Rename from string_set_intervals.

rmail-output-read-file-name fix for bug#12214

This resembles the 2001-05-07 change to rmail-output-read-rmail-file-name,
which was never copied to rmail-output-read-file-name.
It's more complicated now due to Rmail's buffer swapping.

* lisp/mail/rmailout.el (rmail-output-read-file-name):
Check rmail-output-file-alist against the full message body
in the correct rmail buffer.

* lisp/mail/rmail.el: Comment.

Fix typo in ChangeLog entry.

* lisp.h (set_char_table_extras): Rename from char_table_set_extras.

(set_char_table_contents): Rename from char_table_set_contents.
(set_sub_char_table_contents): Rename from sub_char_table_sub_contents.
All uses changed.  See the end of
<http://lists.gnu.org/archive/html/emacs-devel/2012-08/msg00549.html>.

Fix ChangeLog typo.

* lisp.h (CSET): Remove.

(set_char_table_ascii, set_char_table_defalt, set_char_table_parent)
(set_char_table_purpose): New functions,
replacing CSET.  All uses changed.  For example, replace
"CSET (XCHAR_TABLE (char_table), parent, parent);" with
"char_table_set_parent (char_table, parent);".
The old version was confusing because it used the same name
'parent' for two different things.

Fixes: debbugs:12215

Functions to get and set Lisp_Object fields of buffer-local variables.
* lisp.h (blv_found, set_blv_found, blv_value, set_blv_value)
(set_blv_where, set_blv_defcell, set_blv_valcell): New functions.
(BLV_FOUND, SET_BLV_FOUND, BLV_VALUE, SET_BLV_VALUE): Remove.
* data.c, eval.c, frame.c: Adjust users.

write docstrings for the thread functions

declare unbind_for_thread_switch and rebind_for_thread_switch in lisp.h

nt/config.nt: Sync with autogen/config.in.
(HAVE_POSIX_OPENPT): New macro.

Auto-commit of generated files.

* net/tramp-sh.el (tramp-sh-handle-start-file-process): Eliminate
superfluous prompt.  (Bug#12203)

Allow face-remapping using :font, and use it in mouse-appearance-menu.

* mouse.el (mouse-appearance-menu): If x-select-font returns a
font spec, set the font directly.

* xfaces.c (merge_face_vectors): If the target font specfies a
font spec, make the font's attributes take precedence over
directly-specified attributes.
(merge_face_ref): Recognize :font.

Fixes: debbugs:3228

quail-define-inscript-package tiny change

* leim/quail/indian.el (quail-define-inscript-package):
Set kbd-translate for all Inscript layouts.  It's a positional
layout: vowels should be on the left hand regardless of the
underlying characters produced by those keys.

Fixes: debbugs:12072

Whitespace

Fix pty handling on FreeBSD 8.0  (tiny change)

* configure.ac (PTY_OPEN): Try posix_openpt on gnu-linux,
gnu-kfreebsd, freebsd, and netbsd.

Fixes: debbugs:12040

Fix latest fix of delete-window.

* window.el (delete-window): Fix last fix.

Do not use memcpy for copying intervals.
* intervals.c (reproduce_interval): New function.
(reproduce_tree, reproduce_tree_obj): Use it.
(reproduce_tree_obj): Remove prototype.

* lisp.h (duration_to_sec_usec): Remove unused decl.

* nsfont.m (ns_ascii_average_width): Send initWithFormat selector
to an allocated instance of NSString, not to the class itself.

* lib-src/makefile.w32-in ($(BLD)/regex.$(O)): Update dependencies.

* src/makefile.w32-in (C_CTYPE_H): New macro.
(LISP_H, $(BLD)/ccl.$(O), $(BLD)/doc.$(O), $(BLD)/w32console.$(O)):
($(BLD)/fontset.$(O), $(BLD)/frame.$(O), $(BLD)/composite.$(O)):
($(BLD)/sysdep.$(O), $(BLD)/w32uniscribe.$(O)): Update dependencies.

Use ASCII tests for character types.

* admin/merge-gnulib (GNULIB_MODULES): Add c-ctype.
* lwlib/lwlib-Xaw.c, lwlib/lwlib.c, lwlib/xlwmenu.c:
Don't include <ctype.h>; no longer needed.
* lwlib/lwlib-Xaw.c (openFont):
* lwlib/xlwmenu.c (openXftFont): Test just for ASCII digits.
* src/category.c, src/dispnew.c, src/doprnt.c, src/editfns.c, src/syntax.c
* src/term.c, src/xfns.c, src/xterm.c:
Don't include <ctype.h>; was not needed.
* src/charset.c, src/doc.c, src/fileio.c, src/font.c, src/frame.c:
* src/gtkutil.c, src/image.c, src/sysdep.c, src/xfaces.c:
Include <c-ctype.h> instead of <ctype.h>.
* src/nsterm.m: Include <c-ctype.h>.
* src/charset.c (read_hex):
* src/doc.c (Fsnarf_documentation):
* src/fileio.c (IS_DRIVE) [WINDOWSNT]:
(DRIVE_LETTER) [DOS_NT]:
(Ffile_name_directory, Fexpand_file_name)
(Fsubstitute_in_file_name):
* src/font.c (font_parse_xlfd, font_parse_fcname):
* src/frame.c (x_set_font_backend):
* src/gtkutil.c (xg_get_font):
* src/image.c (xbm_scan, xpm_scan, pbm_scan_number):
* src/nsimage.m (hexchar):
* src/nsterm.m (ns_xlfd_to_fontname):
* src/sysdep.c (system_process_attributes):
* src/xfaces.c (hash_string_case_insensitive):
Use C-locale tests instead of locale-specific tests for character
types, since we want the ASCII interpretation here, not the
interpretation suitable for whatever happens to be the current locale.

In window.el tell whether functions operate on valid, live or any windows.

* window.el (window-child, window-child-count, window-last-child)
(window-normalize-window, window-combined-p)
(window-combinations, window-atom-root, window-min-size)
(window-sizable, window-sizable-p, window-size-fixed-p)
(window-min-delta, window-max-delta, window--resizable)
(window--resizable-p, window-resizable, window-total-size)
(window-full-height-p, window-full-width-p, window-body-size)
(window-at-side-p, adjust-window-trailing-edge, maximize-window)
(minimize-window, window-deletable-p, delete-window)
(delete-other-windows, set-window-buffer-start-and-point)
(next-buffer, previous-buffer, split-window, balance-windows-2)
(set-window-text-height, window-buffer-height)
(fit-window-to-buffer, shrink-window-if-larger-than-buffer)
(truncated-partial-width-window-p): Minor code adjustments.  In
doc-strings state whether the argument window has to denote a
live, valid or any window.

Auto-commit of generated files.

Consistently check windows for validity/liveness (Bug#11984, Bug#12025, Bug#12026).

* lisp.h (CHECK_VALID_WINDOW): New macro.
* window.c (decode_window): Rename to decode_live_window.
(decode_valid_window, Fwindow_valid_p): New functions.
(Fwindow_frame, Fframe_root_window, Fwindow_minibuffer_p)
(Fframe_first_window, Fframe_selected_window, Fwindow_parent)
(Fwindow_top_child, Fwindow_left_child, Fwindow_next_sibling)
(Fwindow_prev_sibling, Fwindow_combination_limit)
(Fset_window_combination_limit, Fwindow_use_time)
(Fwindow_total_height, Fwindow_total_width, Fwindow_new_total)
(Fwindow_normal_size, Fwindow_new_normal, Fwindow_left_column)
(Fwindow_top_line, Fwindow_body_height, Fwindow_body_width)
(Fwindow_hscroll, Fset_window_hscroll)
(Fwindow_redisplay_end_trigger)
(Fset_window_redisplay_end_trigger, Fwindow_edges)
(Fwindow_pixel_edges, Fwindow_absolute_pixel_edges)
(Fwindow_inside_edges, Fwindow_inside_pixel_edges)
(Fcoordinates_in_window_p, Fwindow_point, Fwindow_start)
(Fwindow_end, Fset_window_point, Fset_window_start)
(Fpos_visible_in_window_p, Fwindow_line_height)
(Fwindow_dedicated_p, Fset_window_dedicated_p)
(Fwindow_prev_buffers, Fset_window_prev_buffers)
(Fwindow_next_buffers, Fwindow_parameters, Fwindow_parameter)
(Fset_window_parameter, Fwindow_display_table)
(Fset_window_display_table, Fdelete_other_windows_internal)
(Fset_window_buffer, Fset_window_new_total)
(Fset_window_new_normal, Fdelete_window_internal)
(Fwindow_text_height, Fset_window_margins, Fwindow_margins)
(Fset_window_fringes, Fwindow_fringes, Fset_window_scroll_bars)
(Fwindow_scroll_bars): Check whether argument window is a valid or
live window.  Update doc-strings.
(syms_of_window): New symbol Qwindow_valid_p.
* keyboard.c (Fposn_at_x_y): Check whether argument
frame_or_window denotes a valid window.
* window.el (window-valid-p): Move to window.c.

Fix previous char table change.
* lisp.h (CHAR_TABLE_SET): Use sub_char_table_set_contents.
* chartab.c (optimize_sub_char_table): Likewise.

* gtkutil.c (xg_get_font): Demand an Xft font.

Fixes: debbugs:3228

Fix average font width calculation on NS.

* src/nsfont.m (nsfont_open): Similar to the Xft backend, set
min_width to space_width and average_width to the average over
printable ASCII characters.
(ns_char_width): Code cleanup.
(ns_ascii_average_width): New utility function.

For Xft and X font backends, set omitted max_width font fields.

* src/xfont.c (xfont_open):
* src/xftfont.c (xftfont_open): Set the font's max_width field.

* src/font.h (struct font): Update comments.

Make subword.el easier to customize (tiny change)

* lisp/progmodes/subword.el (subword-forward-function)
(subword-backward-function, subword-forward-regexp, subword-backward-regexp):
New variables.
(subword-forward, subword-forward-internal, subword-backward-internal):
Use new variables, eg so that different "word" definitions can be easily used.

Fixes: debbugs:11411

Simple interface to set Lisp_Object fields of chararcter tables.
* lisp.h (CSET): New macro.
(char_table_set_extras, char_table_set_contents)
(sub_char_table_set_contents): New function.
* casetab.c, category.c, chartab.c, fns.c, fontset.c, search.c:
* syntax.c: Adjust users.

* src/eval.c (eval_sub): Bind lexical-binding.
* src/lread.c (Qlexical_binding): Make non-static.

* lisp/vc/vc-mtn.el (vc-mtn-revision-completion-table): Handle completion
for composite selectors.
* lisp/vc/vc.el (vc-diff-build-argument-list-internal): Don't prevent
operation just because we can't find a previous revision.

add test case for I/O switching

process changes

This changes wait_reading_process_output to handle threads better.  It
introduces a wrapper for select that releases the global lock, and it
ensures that only a single thread can select a given file descriptor
at a time.

This also adds the thread-locking feature to processes.  By default a
process can only have its output accepted by the thread that created
it.  This can be changed using set-process-thread.  (If the thread
exits, the process is again available for waiting by any thread.)

Note that thread-signal will not currently interrupt a thread blocked
on select.  I'll fix this later.

Prepare process.c for threads by not having global select masks.
The next step is to make it so selects can choose fds by thread.

fix a latent bug in process.c

* process.c (wait_reading_process_output): Check Writeok bits,
not write_mask.

This adds thread-blocker, a function to examine what a thread is
blocked on.  I thought this would be another nice debugging addition.

This adds names to mutexes.  This seemed like a nice debugging
extension.

This adds some tests of the threading code.

This supplies the mutex implementation for Emacs Lisp.

A lisp mutex is implemented using a condition variable, so that we can
interrupt a mutex-lock operation by calling thread-signal on the
blocking thread.  I did things this way because pthread_mutex_lock
can't readily be interrupted.

This adds most of the thread features visible to emacs lisp.

I roughly followed the Bordeaux threads API:

http://trac.common-lisp.net/bordeaux-threads/wiki/ApiDocumentation

... but not identically.  In particular I chose not to implement
interrupt-thread or destroy-thread, but instead a thread-signalling
approach.

I'm still undecided about *default-special-bindings* (which I did not
implement).  I think it would be more emacs-like to capture the let
bindings at make-thread time, but IIRC Stefan didn't like this idea
the first time around.

There are one or two semantics issues pointed out in the patch where I
could use some advice.

This turns thread_state into a pseudovector and updates various bits
of Emacs to cope.

This introduces some new functions to handle the specpdl.  The basic
idea is that when a thread loses the interpreter lock, it will unbind
the bindings it has put in place.  Then when a thread acquires the
lock, it will restore its bindings.

This code reuses an existing empty slot in struct specbinding to store
the current value when the thread is "swapped out".

This approach performs worse than my previously planned approach.
However, it was one I could implement with minimal time and
brainpower.  I hope that perhaps someone else could improve the code
once it is in.

This introduces the low-level system threading support.  It also adds
the global lock.  The low-level support is a bit over-eager, in that
even at the end of the present series, it will not all be used.  I
think thiat is ok since I plan to use it all eventually -- in
particular for the emacs lisp mutex implementation.

I've only implemented the pthreads-based version.  I think it should
be relatively clear how to port this to other systems, though.

I'd also like to do a "no threads" port that will turn most things
into no-ops, and have thread-creation fail.  I was thinking perhaps
I'd make a future (provide 'threads) conditional on threads actually
working.

One other minor enhancement available here is to make it possible to
set the name of the new thread at the OS layer.  That way gdb, e.g.,
could display thread names.

This parameterizes the GC a bit to make it thread-ready.

The basic idea is that whenever a thread "exits lisp" -- that is,
releases the global lock in favor of another thread -- it must save
its stack boundaries in the thread object.  This way the boundaries
are always available for marking.  This is the purpose of
flush_stack_call_func.

I haven't tested this under all the possible GC configurations.
There is a new FIXME in a spot that i didn't convert.

Arguably all_threads should go in the previous patch.

Improve event loop on NS so that no polling is used.

* nsmenu.m (popupSession): Remove.
(pop_down_menu): Remove endModalSession.
(timeout_handler:): New method.
(runDialogAt:): Get next timeout.  Start a NSTimer with that timeout.
Call runModalForWindow.  Check timer_fired when it returns.
If not set, cancel timer and break out of loop.
Otherwise loop again, with a new timeout.

* nsterm.h (EmacsApp): fd_handler takes id argument.
(EmacsDialogPanel): Add timer_fired and timeout_handler.

* nsterm.m: Include fcntl.h if present.
(fd_entry, t_readfds, inNsSelect): Remove.
(select_writefds, select_valid, select_timeout, selfds)
(select_mutex, apploopnr): Add.
(EV_TRAILER): Call kbd_buffer_store_event_hold only if q_event_ptr.
Otherwise call kbd_buffer_store_event.
(ns_send_appdefined): Remove release of fd_entry.
(ns_read_socket): Always send appdefined.  Remove inNsSelect check.
Increment and decrement apploopnr.
(ns_select): If no file descriptors, just do a NSTimer.
Otherwise copy read/write masks and start select thread (fd_handler).
Start main loop and wait for application defined event.
Inform select thread to stop selecting after main loop is exited.
(ns_term_init): Create selfds pipe and set non-blocking.
Initialize select_mutex. Start the select thread (fd_handler).
(fd_handler:): Loop forever, wait for info from the main thread
to either start or stop selecting.  When select returns, send
and appdefined event.
(sendScrollEventAtLoc:fromEvent:): Check if q_event_ptr is set.
If not call kbd_buffer_store_event.