* bug#15561: Fwd: bug#15561: periodic timer stops running
[not found] <CAFM41H34WhVZ_fCWoh9BxDqs07OPXi_u=5ghTHkv_zAp22SxBA@mail.gmail.com>
@ 2014-02-27 22:11 ` Barry OReilly
[not found] ` <530FF70C.2020905@cs.ucla.edu>
1 sibling, 0 replies; 5+ messages in thread
From: Barry OReilly @ 2014-02-27 22:11 UTC (permalink / raw)
To: 15561
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The patch addresses:
> If it means to block SIGALRM during timers, that doesn't always
> happen because timers run within timers. The end of an inner timer
> would unblock SIGALRM and the outer timer would finish with the
> sigmask unblocked.
but I don't see it address:
> But what happens if the next timer happens to be soon, and Emacs
> receives SIGALRM inbetween set_alarm and unblock_timers?
That one sounds more likely to cause a timer to stop.
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^ permalink raw reply [flat|nested] 5+ messages in thread[parent not found: <530FF70C.2020905@cs.ucla.edu>]
* bug#15561: periodic timer stops running
[not found] ` <530FF70C.2020905@cs.ucla.edu>
@ 2014-02-28 2:42 ` Paul Eggert
2014-02-28 8:03 ` bug#15561: " Dmitry Antipov
0 siblings, 1 reply; 5+ messages in thread
From: Paul Eggert @ 2014-02-28 2:42 UTC (permalink / raw)
To: Barry OReilly; +Cc: 15561
[Resending with corrected bug-report address; sorry about that.]
Barry OReilly wrote:
> But what happens if the next timer happens to be soon, and Emacs receives SIGALRM inbetween set_alarm and unblock_timers?
Are you talking about a SIGALRM received during the execution of
do_pending_atimers, between run_timer's call to set_alarm and
do_pending_atimers's call to unblock_atimers? If so, the SIGALRM should
be held by the operating system during that period, and Emacs won't be
informed of the SIGALRM until unblock_atimers does its thing. Sorry, I
don't see how this would cause a timer to stop.
^ permalink raw reply [flat|nested] 5+ messages in thread* bug#15561: Re: bug#15561: periodic timer stops running
2014-02-28 2:42 ` Paul Eggert
@ 2014-02-28 8:03 ` Dmitry Antipov
2014-02-28 9:18 ` Eli Zaretskii
0 siblings, 1 reply; 5+ messages in thread
From: Dmitry Antipov @ 2014-02-28 8:03 UTC (permalink / raw)
To: Paul Eggert; +Cc: 15561
On 02/28/2014 06:42 AM, Paul Eggert wrote:
> [Resending with corrected bug-report address; sorry about that.]
>
> Barry OReilly wrote:
>> But what happens if the next timer happens to be soon, and Emacs receives SIGALRM inbetween set_alarm and unblock_timers?
>
> Are you talking about a SIGALRM received during the execution of do_pending_atimers, between run_timer's call to set_alarm and do_pending_atimers's call to unblock_atimers? If so, the SIGALRM should
> be held by the operating system during that period, and Emacs won't be informed of the SIGALRM until unblock_atimers does its thing. Sorry, I don't see how this would cause a timer to stop.
BTW, we have at least one backtrace with nested calls to timer_check_2 (http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16817#11):
...
64 Emacs 0x00000001002067b2 Ffuncall + 1762 (eval.c:2827)
65 Emacs 0x00000001002070e9 call1 + 73 (eval.c:2572)
66 Emacs 0x000000010013d6a6 timer_check_2 + 1846 (keyboard.c:4447) ;; Nested call
67 Emacs 0x000000010013cef5 timer_check + 165 (keyboard.c:4514)
68 Emacs 0x0000000100139c25 readable_events + 37 (keyboard.c:3405)
69 Emacs 0x000000010013cdb6 get_input_pending + 54 (keyboard.c:6794)
70 Emacs 0x0000000100142ce4 Finput_pending_p + 132 (keyboard.c:10449)
71 Emacs 0x000000010020652d Ffuncall + 1117 (eval.c:2775)
72 Emacs 0x000000010027173a exec_byte_code + 3866 (bytecode.c:900)
73 Emacs 0x0000000100207b6e funcall_lambda + 1566 (eval.c:3010)
74 Emacs 0x00000001002067b2 Ffuncall + 1762 (eval.c:2827)
75 Emacs 0x000000010027173a exec_byte_code + 3866 (bytecode.c:900)
76 Emacs 0x0000000100207b6e funcall_lambda + 1566 (eval.c:3010)
77 Emacs 0x00000001002067b2 Ffuncall + 1762 (eval.c:2827)
78 Emacs 0x0000000100205b33 Fapply + 243 (eval.c:2255)
79 Emacs 0x0000000100206403 Ffuncall + 819 (eval.c:2759)
80 Emacs 0x000000010027173a exec_byte_code + 3866 (bytecode.c:900)
81 Emacs 0x000000010027080f Fbyte_code + 63 (bytecode.c:475)
82 Emacs 0x0000000100200e79 eval_sub + 2073 (eval.c:2149)
83 Emacs 0x0000000100203d84 internal_lisp_condition_case + 772 (eval.c:1243)
84 Emacs 0x0000000100272957 exec_byte_code + 8503 (bytecode.c:1096)
85 Emacs 0x0000000100207b6e funcall_lambda + 1566 (eval.c:3010)
86 Emacs 0x00000001002067b2 Ffuncall + 1762 (eval.c:2827)
87 Emacs 0x00000001002070e9 call1 + 73 (eval.c:2572)
88 Emacs 0x000000010013d6a6 timer_check_2 + 1846 (keyboard.c:4447) ;; First call
89 Emacs 0x000000010013cef5 timer_check + 165 (keyboard.c:4514)
90 Emacs 0x0000000100139c25 readable_events + 37 (keyboard.c:3405)
91 Emacs 0x000000010013cdb6 get_input_pending + 54 (keyboard.c:6794)
92 Emacs 0x00000001001382e6 detect_input_pending_run_timers + 54 (keyboard.c:10391)
93 Emacs 0x0000000100280963 wait_reading_process_output + 4227 (process.c:4762)
94 Emacs 0x00000001000087fa sit_for + 634 (dispnew.c:5981)
...
(I just wonder whether this behaviour is acceptable).
Dmitry
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[not found] <CAFM41H34WhVZ_fCWoh9BxDqs07OPXi_u=5ghTHkv_zAp22SxBA@mail.gmail.com>
2014-02-27 22:11 ` bug#15561: Fwd: bug#15561: periodic timer stops running Barry OReilly
[not found] ` <530FF70C.2020905@cs.ucla.edu>
2014-02-28 2:42 ` Paul Eggert
2014-02-28 8:03 ` bug#15561: " Dmitry Antipov
2014-02-28 9:18 ` Eli Zaretskii
2014-02-28 13:51 ` Stefan Monnier
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