Re: [PATCH] Fix blocking read timeouts at a small probability

[Chet Ramey]

On 2/12/21 8:20 PM, Koichi Murase wrote:

> I personally don't use this particularly short timeout, but this shows
> that the masked SIGCHLD is again another ``partial'' fix. Yesterday I
> actually received an email from felix <felix@f-hauri.ch> that he has
> actually posted the same issue on the mailing list last October:
>
> 2021年2月12日(金) 16:11 felix <felix@f-hauri.ch>:
> > Sorry for delay... This seem linked to my post in october:
> >    https://lists.gnu.org/archive/html/bug-bash/2020-10/msg00095.html
> >    ( typo in subject: s/hand/hang/ ;)
>
> Looking at his test cases, he seems to be interested in the timeout of
> the order of microseconds.

Just for testing, not for any real use case.

> He also provided me with his new test case
> to see the interaction with SIGCHLD. The failure of this test case
> seems to have also involved SIGCHLD in the previous devel Bash. Now in
> the current devel, it is improved but still sometimes blocks.

If you need a timeout on the order of a single microsecond in a shell
script, I urge you to reconsider your choices.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/