diff options
author | Paul Eggert <[email protected]> | 2012-09-16 14:43:55 -0700 |
---|---|---|
committer | Paul Eggert <[email protected]> | 2012-09-16 14:43:55 -0700 |
commit | 0caaedb1c3c9c48980144e41d2a95329d39c399a (patch) | |
tree | 3e191e2b290e9adf91594be047c1f268cacde932 /src/sysdep.c | |
parent | 634b8cacd6cc0557c1963ad7409db247963046d2 (diff) |
Remove configure's --without-sync-input option.
When auditing signal-handling in preparation for cleaning it up,
I found that SYNC_INPUT has race conditions and would be a real
pain to fix. Since it's an undocumented and deprecated
configure-time option, now seems like a good time to remove it.
Also see <http://bugs.gnu.org/11080#16>.
* configure.ac (SYNC_INPUT, BROKEN_SA_RESTART): Remove.
* admin/CPP-DEFINES (BROKEN_SA_RESTART, SA_RESTART): Remove.
* etc/TODO (Make SYNC_INPUT the default): Remove, as the code now
behaves as if SYNC_INPUT is always true.
* src/alloc.c (_bytes_used, __malloc_extra_blocks, _malloc_internal)
(_free_internal) [!DOUG_LEA_MALLOC]: Remove decls.
(alloc_mutex) [!SYSTEM_MALLOC && !SYNC_INPUT && HAVE_PTHREAD]:
(malloc_hysteresis):
(check_depth) [XMALLOC_OVERRUN_CHECK]:
(MALLOC_BLOCK_INPUT, MALLOC_UNBLOCK_INPUT):
(__malloc_hook, __realloc_hook, __free_hook, BYTES_USED)
(dont_register_blocks, bytes_used_when_reconsidered)
(bytes_used_when_full, emacs_blocked_free, emacs_blocked_malloc)
(emacs_blocked_realloc, reset_malloc_hooks, uninterrupt_malloc):
[!SYSTEM_MALLOC && !SYNC_INPUT]:
Remove. All uses removed.
(MALLOC_BLOCK_INPUT, MALLOC_UNBLOCK_INPUT): Use a different
implementation, one that depends on whether the new macro
XMALLOC_BLOCK_INPUT_CHECK is defined, not on whether SYNC_INPUT
is defined.
* src/atimer.c (run_timers, handle_alarm_signal):
* src/keyboard.c (pending_signal, poll_for_input_1, poll_for_input)
(handle_async_input, process_pending_signals)
(handle_input_available_signal, init_keyboard):
* src/nsterm.m (ns_read_socket):
* src/process.c (wait_reading_process_output):
* src/regex.c (immediate_quit, IMMEDIATE_QUIT_CHECK):
* src/sysdep.c (emacs_sigaction_init) [SA_RESTART]:
(emacs_write):
* src/xterm.c (XTread_socket):
Assume SYNC_INPUT.
* src/conf_post.h (SA_RESTART) [IRIX6_5]: Do not #undef.
* src/eval.c (handling_signal): Remove. All uses removed.
* src/lisp.h (ELSE_PENDING_SIGNALS): Remove.
All uses replaced with the SYNC_INPUT version.
(reset_malloc_hooks, uninterrupt_malloc, handling_signal):
Remove decls.
* src/sysdep.c, src/syssignal.h (main_thread) [FORWARD_SIGNAL_TO_MAIN_THREAD]:
Now static.
Fixes: debbugs:12450
Diffstat (limited to 'src/sysdep.c')
-rw-r--r-- | src/sysdep.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/src/sysdep.c b/src/sysdep.c index 9065b38d6f..dbfd9efc7d 100644 --- a/src/sysdep.c +++ b/src/sysdep.c @@ -1447,27 +1447,21 @@ emacs_sigaction_init (struct sigaction *action, signal_handler_t handler) action->sa_handler = handler; action->sa_flags = 0; #if defined (SA_RESTART) - /* Emacs mostly works better with restartable system services. If this - flag exists, we probably want to turn it on here. - However, on some systems (only hpux11 at present) this resets the - timeout of `select' which means that `select' never finishes if - it keeps getting signals. - We define BROKEN_SA_RESTART on those systems. */ - /* It's not clear why the comment above says "mostly works better". --Stef - When SYNC_INPUT is set, we don't want SA_RESTART because we need to poll + /* SA_RESTART causes interruptible functions with timeouts (e.g., + 'select') to reset their timeout on some platforms (e.g., + HP-UX 11), which is not what we want. Also, when Emacs is + interactive, we don't want SA_RESTART because we need to poll for pending input so we need long-running syscalls to be interrupted after a signal that sets the interrupt_input_pending flag. */ /* Non-interactive keyboard input goes through stdio, where we always want restartable system calls. */ -# if defined (BROKEN_SA_RESTART) || defined (SYNC_INPUT) if (noninteractive) -# endif action->sa_flags = SA_RESTART; #endif } #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD -pthread_t main_thread; +static pthread_t main_thread; #endif /* If we are on the main thread, handle the signal SIG with HANDLER. @@ -1914,11 +1908,9 @@ emacs_write (int fildes, const char *buf, ptrdiff_t nbyte) { if (errno == EINTR) { -#ifdef SYNC_INPUT /* I originally used `QUIT' but that might causes files to be truncated if you hit C-g in the middle of it. --Stef */ process_pending_signals (); -#endif continue; } else |