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Re: bash should retry a fork() returning EAGAIN


From: Eric Blake
Subject: Re: bash should retry a fork() returning EAGAIN
Date: Tue, 18 Sep 2007 18:26:23 -0600
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According to Matthew Woehlke on 9/18/2007 4:39 PM:
> Martin Koeppe wrote:
>> I'm using bash 3.1 on interix. There fork() may fail with EAGAIN if
>> e.g. several builds (configures) are running in parallel.
>> Unfortunately, fork() isn't retried and configure stops.
>>
>> So I suggest adding this patch to bash which retries fork() when it
>> fails with EAGAIN.  Idea is from pdksh.  At least 3.2 doesn't have
>> such a patch, I didn't look though all the patches after 3.2, however.
> 
> Might be worth checking with the Cygwin folks, but this sounds like it
> would be useful in Cygwin also. (IIRC, this problem is why I dropped SUA
> for Cygwin in the first place, i.e. in SUA the problem was much worse.)
> 
> Eric, are you watching this? :-)

It does look like an interesting patch, so I might play with it some more
in the cygwin port of bash.  In the meantime, cygwin CVS has added an
automatic retry parameter to the CYGWIN variable, that is supposed to help
reduce the number of EAGAIN failures in the first place.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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