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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Johannes Sixt <j6t@kdbg.org>
Cc: "Junio C Hamano" <gitster@pobox.com>,
	"SZEDER Gábor" <szeder.dev@gmail.com>,
	"René Scharfe" <l.s.r@web.de>,
	"Emily Shaffer" <emilyshaffer@google.com>,
	"Taylor Blau" <me@ttaylorr.com>,
	git@vger.kernel.org
Subject: Re: [PATCH v4 8/8] progress.c: add & assert a "global_progress" variable
Date: Mon, 25 Oct 2021 14:29:36 +0200	[thread overview]
Message-ID: <211025.8635opi8om.gmgdl@evledraar.gmail.com> (raw)
In-Reply-To: <c65c0a54-b66f-a043-01d9-192f9ca1efde@kdbg.org>


On Mon, Oct 25 2021, Johannes Sixt wrote:

> Am 25.10.21 um 13:25 schrieb Ævar Arnfjörð Bjarmason:
>> Once we have a
>> global current progress object we'll be able to update that object via
>> SIGALRM, this will cover cases where we're busy, but either haven't
>> invoked our first display_progress() yet, or the time between
>> display_progress() is too long. See [3] for early code to do that.
>
> This can't be a goal. You cannot do serious stuff in a signal handler.
> Don't proliferate complicated signal handlers.

I'd missed some of the nuances with signal safety when I hacked that up
initially. For the purposes of this patch the commit message is
discussing a POC that suggests an interesting direction to go in.

My current implementation of this which I've run with for some time
relies on undefined behavior and glibc being forgiving, but for any
future submission I'll make sure it's signal-safe.

In particular to format a progress line etc. we we need sprintf() and
the like, but to have a "stalled" message we can pre-format that at
start_progress() time, and inside the signal handler all we'll need is a
write(), which should be safe in most places...

> On top of that, our SIGALRM handler on Windows runs in its own thread
> and can't do more than set a volatile sigatomic_t (and even that is
> undefined behavior, strictly speaking).

... but we may need to disable it entirely on some platforms, I didn't
know about that Windows edge case.

Anyway, for this patch having the BUG() is useful even if we never went
for that.

  reply	other threads:[~2021-10-25 12:35 UTC|newest]

Thread overview: 184+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-20 20:02 [PATCH 0/7] progress: verify progress counters in the test suite SZEDER Gábor
2021-06-20 20:02 ` [PATCH 1/7] progress: introduce GIT_TEST_CHECK_PROGRESS to verify progress counters SZEDER Gábor
2021-06-21  7:09   ` Ævar Arnfjörð Bjarmason
2021-06-22 15:55   ` Taylor Blau
2021-06-20 20:02 ` [PATCH 2/7] progress: catch nested/overlapping progresses with GIT_TEST_CHECK_PROGRESS SZEDER Gábor
2021-06-22 16:00   ` Taylor Blau
2021-08-30 21:15     ` SZEDER Gábor
2021-06-20 20:02 ` [PATCH 3/7] progress: catch backwards counting " SZEDER Gábor
2021-06-20 20:03 ` [PATCH 4/7] commit-graph: fix bogus counter in "Scanning merged commits" progress line SZEDER Gábor
2021-06-20 22:13   ` Ævar Arnfjörð Bjarmason
2021-06-21 18:32     ` René Scharfe
2021-06-21 20:08       ` Ævar Arnfjörð Bjarmason
2021-06-26  8:27         ` René Scharfe
2021-06-26 14:11           ` Ævar Arnfjörð Bjarmason
2021-06-26 20:22             ` René Scharfe
2021-06-26 21:38               ` Ævar Arnfjörð Bjarmason
2021-07-04 12:15                 ` René Scharfe
2021-07-05 14:09                   ` Junio C Hamano
2021-07-05 23:28                   ` Ævar Arnfjörð Bjarmason
2021-07-06 16:02                     ` René Scharfe
2021-06-27 17:31               ` Felipe Contreras
2021-06-20 20:03 ` [PATCH 5/7] entry: show finer-grained counter in "Filtering content" " SZEDER Gábor
2021-06-20 20:03 ` [PATCH 6/7] [RFC] entry: don't show "Filtering content: ... done." line in case of errors SZEDER Gábor
2021-06-21 18:32   ` René Scharfe
2021-06-23  1:52     ` Taylor Blau
2021-08-30 21:17       ` SZEDER Gábor
2021-06-20 20:03 ` [PATCH 7/7] test-lib: enable GIT_TEST_CHECK_PROGRESS by default SZEDER Gábor
2021-06-21  0:59 ` [PATCH 0/7] progress: verify progress counters in the test suite Ævar Arnfjörð Bjarmason
2021-06-23  2:04   ` Taylor Blau
2021-06-23 17:48     ` [PATCH 00/25] progress.c: various fixes + SZEDER's RFC code Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 01/25] progress.c tests: fix breakage with COLUMNS != 80 Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 02/25] progress.c tests: make start/stop verbs on stdin Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 03/25] progress.c tests: test some invalid usage Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 04/25] progress.c tests: add a "signal" verb Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 05/25] progress.c: move signal handler functions lower Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 06/25] progress.c: call progress_interval() from progress_test_force_update() Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 07/25] progress.c: stop eagerly fflush(stderr) when not a terminal Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 08/25] progress.c: add temporary variable from progress struct Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 09/25] midx perf: add a perf test for multi-pack-index Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 10/25] progress.c: remove the "sparse" mode nano-optimization Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 11/25] pack-bitmap-write.c: add a missing stop_progress() Ævar Arnfjörð Bjarmason
2021-09-17  5:14         ` SZEDER Gábor
2021-09-17  5:56           ` Ævar Arnfjörð Bjarmason
2021-09-17 21:38             ` SZEDER Gábor
2021-06-23 17:48       ` [PATCH 12/25] progress.c: add & assert a "global_progress" variable Ævar Arnfjörð Bjarmason
2021-09-16 18:31         ` SZEDER Gábor
2021-06-23 17:48       ` [PATCH 13/25] progress.[ch]: move the "struct progress" to the header Ævar Arnfjörð Bjarmason
2021-09-16 19:42         ` SZEDER Gábor
2021-06-23 17:48       ` [PATCH 14/25] progress.[ch]: move test-only code away from "extern" variables Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 15/25] progress.c: pass "is done?" (again) to display() Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 16/25] progress.[ch]: convert "title" to "struct strbuf" Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 17/25] progress.c: refactor display() for less confusion, and fix bug Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 18/25] progress.c: emit progress on first signal, show "stalled" Ævar Arnfjörð Bjarmason
2021-09-16 18:37         ` SZEDER Gábor
2021-06-23 17:48       ` [PATCH 19/25] commit-graph: fix bogus counter in "Scanning merged commits" progress line Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 20/25] midx: don't provide a total for QSORT() progress Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 21/25] entry: show finer-grained counter in "Filtering content" progress line Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [PATCH 22/25] progress.c: add a stop_progress_early() function Ævar Arnfjörð Bjarmason
2021-06-24 10:35         ` Ævar Arnfjörð Bjarmason
2021-06-25  1:24         ` Andrei Rybak
2021-06-23 17:48       ` [PATCH 23/25] entry: deal with unexpected "Filtering content" total Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [RFC/PATCH 24/25] progress: assert last update in stop_progress() Ævar Arnfjörð Bjarmason
2021-06-23 17:48       ` [RFC/PATCH 25/25] progress: assert counting upwards in display() Ævar Arnfjörð Bjarmason
2021-06-23 17:59       ` [PATCH 00/25] progress.c: various fixes + SZEDER's RFC code Randall S. Becker
2021-06-23 20:01         ` Ævar Arnfjörð Bjarmason
2021-06-23 20:25           ` Randall S. Becker
2021-06-23 21:57 ` [PATCH 0/4] WIP/POC check isatty(2)-protected progress lines SZEDER Gábor
2021-06-23 21:57   ` [PATCH 1/4] WIP progress, isatty(2), hidden progress lnies for GIT_TEST_CHECK_PROGRESS SZEDER Gábor
2021-06-23 21:57   ` [PATCH 2/4] blame: fix progress total with line ranges SZEDER Gábor
2021-06-23 21:57   ` [PATCH 3/4] read-cache: avoid overlapping progress lines SZEDER Gábor
2021-06-23 21:57   ` [PATCH 4/4] preload-index: fix "Refreshing index" progress line SZEDER Gábor
2021-06-23 22:11   ` [PATCH 0/4] WIP/POC check isatty(2)-protected progress lines SZEDER Gábor
2021-06-24 10:43     ` Ævar Arnfjörð Bjarmason
2021-06-24 10:45   ` Ævar Arnfjörð Bjarmason
2021-07-22 12:20 ` [PATCH 0/3] progress.c API users: fix bogus counting Ævar Arnfjörð Bjarmason
2021-07-22 12:20   ` [PATCH 1/3] commit-graph: fix bogus counter in "Scanning merged commits" progress line Ævar Arnfjörð Bjarmason
2021-07-23 21:55     ` Junio C Hamano
2021-08-02 21:07     ` SZEDER Gábor
2021-07-22 12:20   ` [PATCH 2/3] midx: don't provide a total for QSORT() progress Ævar Arnfjörð Bjarmason
2021-07-23 21:56     ` Junio C Hamano
2021-08-05 15:07     ` Phillip Wood
2021-08-05 19:07       ` Ævar Arnfjörð Bjarmason
2021-07-22 12:20   ` [PATCH 3/3] entry: show finer-grained counter in "Filtering content" progress line Ævar Arnfjörð Bjarmason
2021-07-23 22:01     ` Junio C Hamano
2021-08-02 22:05       ` SZEDER Gábor
2021-08-02 21:48     ` SZEDER Gábor
2021-08-05 11:01   ` [PATCH v2 0/3] progress.c API users: fix bogus counting Ævar Arnfjörð Bjarmason
2021-08-05 11:01     ` [PATCH v2 1/3] commit-graph: fix bogus counter in "Scanning merged commits" progress line Ævar Arnfjörð Bjarmason
2021-08-05 11:01     ` [PATCH v2 2/3] midx: don't provide a total for QSORT() progress Ævar Arnfjörð Bjarmason
2021-08-05 11:01     ` [PATCH v2 3/3] entry: show finer-grained counter in "Filtering content" progress line Ævar Arnfjörð Bjarmason
2021-08-23 10:29     ` [PATCH v3 0/2] progress.c API users: fix bogus counting Ævar Arnfjörð Bjarmason
2021-08-23 10:29       ` [PATCH v3 1/2] commit-graph: fix bogus counter in "Scanning merged commits" progress line Ævar Arnfjörð Bjarmason
2021-08-23 10:29       ` [PATCH v3 2/2] entry: show finer-grained counter in "Filtering content" " Ævar Arnfjörð Bjarmason
2021-09-09  1:10       ` [PATCH v4 0/2] progress.c API users: fix bogus counting Ævar Arnfjörð Bjarmason
2021-09-09  1:10         ` [PATCH v4 1/2] commit-graph: fix bogus counter in "Scanning merged commits" progress line Ævar Arnfjörð Bjarmason
2021-09-09  1:10         ` [PATCH v4 2/2] entry: show finer-grained counter in "Filtering content" " Ævar Arnfjörð Bjarmason
2021-09-09 20:02         ` [PATCH v4 0/2] progress.c API users: fix bogus counting Junio C Hamano
2021-07-22 12:54 ` [PATCH 0/8] progress: assert "global_progress" + test fixes / cleanup Ævar Arnfjörð Bjarmason
2021-07-22 12:54   ` [PATCH 1/8] progress.c tests: make start/stop verbs on stdin Ævar Arnfjörð Bjarmason
2021-07-22 12:55   ` [PATCH 2/8] progress.c tests: test some invalid usage Ævar Arnfjörð Bjarmason
2021-07-22 12:55   ` [PATCH 3/8] progress.c: move signal handler functions lower Ævar Arnfjörð Bjarmason
2021-07-22 12:55   ` [PATCH 4/8] progress.c: call progress_interval() from progress_test_force_update() Ævar Arnfjörð Bjarmason
2021-07-22 12:55   ` [PATCH 5/8] progress.c: stop eagerly fflush(stderr) when not a terminal Ævar Arnfjörð Bjarmason
2021-07-22 12:55   ` [PATCH 6/8] progress.c: add temporary variable from progress struct Ævar Arnfjörð Bjarmason
2021-07-22 12:55   ` [PATCH 7/8] pack-bitmap-write.c: add a missing stop_progress() Ævar Arnfjörð Bjarmason
2021-07-22 12:55   ` [PATCH 8/8] progress.c: add & assert a "global_progress" variable Ævar Arnfjörð Bjarmason
2021-09-16 21:34     ` [PATCH 12/25] " Ævar Arnfjörð Bjarmason
2021-07-23 22:02   ` [PATCH 0/8] progress: assert "global_progress" + test fixes / cleanup Junio C Hamano
2021-09-20 23:09   ` [PATCH v2 " Ævar Arnfjörð Bjarmason
2021-09-20 23:09     ` [PATCH v2 1/8] progress.c tests: make start/stop verbs on stdin Ævar Arnfjörð Bjarmason
2021-10-08  3:43       ` Emily Shaffer
2021-09-20 23:09     ` [PATCH v2 2/8] progress.c tests: test some invalid usage Ævar Arnfjörð Bjarmason
2021-10-08  3:53       ` Emily Shaffer
2021-09-20 23:09     ` [PATCH v2 3/8] progress.c: move signal handler functions lower Ævar Arnfjörð Bjarmason
2021-09-20 23:09     ` [PATCH v2 4/8] progress.c: call progress_interval() from progress_test_force_update() Ævar Arnfjörð Bjarmason
2021-09-20 23:09     ` [PATCH v2 5/8] progress.c: stop eagerly fflush(stderr) when not a terminal Ævar Arnfjörð Bjarmason
2021-10-08  3:59       ` Emily Shaffer
2021-10-08  7:01         ` Ævar Arnfjörð Bjarmason
2021-09-20 23:09     ` [PATCH v2 6/8] progress.c: add temporary variable from progress struct Ævar Arnfjörð Bjarmason
2021-10-08  4:02       ` Emily Shaffer
2021-09-20 23:09     ` [PATCH v2 7/8] pack-bitmap-write.c: add a missing stop_progress() Ævar Arnfjörð Bjarmason
2021-10-08  4:04       ` Emily Shaffer
2021-10-08 12:14         ` Ævar Arnfjörð Bjarmason
2021-10-10 21:29       ` SZEDER Gábor
2021-09-20 23:09     ` [PATCH v2 8/8] progress.c: add & assert a "global_progress" variable Ævar Arnfjörð Bjarmason
2021-10-08  4:18       ` Emily Shaffer
2021-10-08  7:15         ` Ævar Arnfjörð Bjarmason
2021-10-13 22:28     ` [PATCH v3 00/10] progress: assert "global_progress" + test fixes / cleanup Ævar Arnfjörð Bjarmason
2021-10-13 22:28       ` [PATCH v3 01/10] leak tests: fix a memory leaks in "test-progress" helper Ævar Arnfjörð Bjarmason
2021-10-13 22:28       ` [PATCH v3 02/10] progress.c test helper: add missing braces Ævar Arnfjörð Bjarmason
2021-10-13 22:28       ` [PATCH v3 03/10] progress.c tests: make start/stop verbs on stdin Ævar Arnfjörð Bjarmason
2021-10-21 22:30         ` SZEDER Gábor
2021-10-22 14:18           ` Ævar Arnfjörð Bjarmason
2021-10-22 22:14             ` Taylor Blau
2021-10-24 20:10               ` SZEDER Gábor
2021-10-22  3:34         ` Emily Shaffer
2021-10-13 22:28       ` [PATCH v3 04/10] progress.c tests: test some invalid usage Ævar Arnfjörð Bjarmason
2021-10-13 22:28       ` [PATCH v3 05/10] progress.c: move signal handler functions lower Ævar Arnfjörð Bjarmason
2021-10-13 22:28       ` [PATCH v3 06/10] progress.c: call progress_interval() from progress_test_force_update() Ævar Arnfjörð Bjarmason
2021-10-22 22:28         ` Taylor Blau
2021-10-13 22:28       ` [PATCH v3 07/10] progress.c: add temporary variable from progress struct Ævar Arnfjörð Bjarmason
2021-10-22 22:37         ` Taylor Blau
2021-10-13 22:28       ` [PATCH v3 08/10] pack-bitmap-write.c: don't return without stop_progress() Ævar Arnfjörð Bjarmason
2021-10-22  3:37         ` Emily Shaffer
2021-10-22 22:47         ` Taylor Blau
2021-10-13 22:28       ` [PATCH v3 09/10] various *.c: use isatty(1|2), not isatty(STDIN_FILENO|STDERR_FILENO) Ævar Arnfjörð Bjarmason
2021-10-22  3:39         ` Emily Shaffer
2021-10-13 22:28       ` [PATCH v3 10/10] progress.c: add & assert a "global_progress" variable Ævar Arnfjörð Bjarmason
2021-10-22  3:42         ` Emily Shaffer
2021-10-25  5:02         ` SZEDER Gábor
2021-10-25  9:38           ` Junio C Hamano
2021-10-25 11:06           ` Ævar Arnfjörð Bjarmason
2021-10-22  3:44       ` [PATCH v3 00/10] progress: assert "global_progress" + test fixes / cleanup Emily Shaffer
2021-10-22 14:21         ` Ævar Arnfjörð Bjarmason
2021-10-25 11:24       ` [PATCH v4 0/8] " Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 1/8] leak tests: fix a memory leaks in "test-progress" helper Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 2/8] progress.c test helper: add missing braces Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 3/8] progress.c tests: make start/stop commands on stdin Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 4/8] progress.c tests: test some invalid usage Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 5/8] progress.c: add temporary variable from progress struct Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 6/8] pack-bitmap-write.c: don't return without stop_progress() Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 7/8] various *.c: use isatty(1|2), not isatty(STDIN_FILENO|STDERR_FILENO) Ævar Arnfjörð Bjarmason
2021-10-25 11:25         ` [PATCH v4 8/8] progress.c: add & assert a "global_progress" variable Ævar Arnfjörð Bjarmason
2021-10-25 11:53           ` Johannes Sixt
2021-10-25 12:29             ` Ævar Arnfjörð Bjarmason [this message]
2021-11-01 19:09         ` [PATCH v5 0/8] progress: assert "global_progress" + test fixes / cleanup Ævar Arnfjörð Bjarmason
2021-11-01 19:09           ` [PATCH v5 1/8] leak tests: fix a memory leaks in "test-progress" helper Ævar Arnfjörð Bjarmason
2021-11-01 19:09           ` [PATCH v5 2/8] progress.c test helper: add missing braces Ævar Arnfjörð Bjarmason
2021-11-01 19:09           ` [PATCH v5 3/8] progress.c tests: make start/stop commands on stdin Ævar Arnfjörð Bjarmason
2021-11-01 19:09           ` [PATCH v5 4/8] progress.c tests: test some invalid usage Ævar Arnfjörð Bjarmason
2021-11-01 19:09           ` [PATCH v5 5/8] progress.c: add temporary variable from progress struct Ævar Arnfjörð Bjarmason
2021-11-01 19:09           ` [PATCH v5 6/8] pack-bitmap-write.c: don't return without stop_progress() Ævar Arnfjörð Bjarmason
2021-11-01 19:09           ` [PATCH v5 7/8] various *.c: use isatty(1|2), not isatty(STDIN_FILENO|STDERR_FILENO) Ævar Arnfjörð Bjarmason
2021-11-02  0:58             ` Carlo Arenas
2021-11-01 19:09           ` [PATCH v5 8/8] progress.c: add & assert a "global_progress" variable Ævar Arnfjörð Bjarmason
2021-11-02 12:27           ` [PATCH v6 0/8] progress: assert "global_progress" + test fixes / cleanup Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 1/8] leak tests: fix a memory leaks in "test-progress" helper Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 2/8] progress.c test helper: add missing braces Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 3/8] progress.c tests: make start/stop commands on stdin Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 4/8] progress.c tests: test some invalid usage Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 5/8] progress.c: add temporary variable from progress struct Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 6/8] pack-bitmap-write.c: don't return without stop_progress() Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 7/8] various *.c: use isatty(0|2), not isatty(STDIN_FILENO|STDERR_FILENO) Ævar Arnfjörð Bjarmason
2021-11-02 12:27             ` [PATCH v6 8/8] progress.c: add & assert a "global_progress" variable Ævar Arnfjörð Bjarmason

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