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Re: [bug-gettext] gettxt `configure` hangs @ "checking for work

From: Mikko Rantalainen
Subject: Re: [bug-gettext] gettxt `configure` hangs @ "checking for working sleep... " ?
Date: Mon, 20 May 2019 13:27:37 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1

Bruno Haible (20/05/2019 00.17 Europe/Helsinki):
> address@hidden wrote in
> <https://lists.gnu.org/archive/html/bug-gettext/2013-11/msg00009.html>:
>> I'm building gettext- on 
>>      uname -a
>>              Linux jenl.devtest.loc 3.7.10-1.16-desktop #1 SMP
>>              PREEMPT Fri May 31 20:21:23 UTC 2013 (97c14ba) x86_64
>>              x86_64 x86_64 GNU/Linux
>> ...
>>      checking for working sleep... 
>> and just sits there, interminably.  Ctrl-C breaks out without issue.
> It is executing the configure test from gnulib/m4/sleep.m4, which just
> exercises a bit of waiting and signal handling (fully POSIX compliant).

Checking the source of sleep.m4 (assuming I found the correct one) shows

>     signal (SIGALRM, handle_alarm);
>     alarm (1);
>     remaining = sleep (pentecost);

If system is under very high load it might take more than 1 second of
wall clock time to get from alarm() to sleep() and this test will then
hang for 50 days. I guess a correct way to fix this is to introduce a
new flag to tell if test is complete and if alarm is triggered before
the test is complete, re-arm the alarm 1 second later.


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