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Re:Re: job control problem
- X-seq: zsh-users 16858
- From: hanpingtian <hanpingtian@xxxxxxx>
- To: "Bart Schaefer" <schaefer@xxxxxxxxxxxxxxxx>
- Subject: Re:Re: job control problem
- Date: Wed, 7 Mar 2012 17:16:52 +0800 (CST)
- Cc: zsh-users@xxxxxxx
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On Tue, Mar 06, 2012 at 09:46:08PM -0800, Bart Schaefer wrote:
> On Mar 6, 6:01pm, hanpingtian wrote:
> } And I noticed that when trying to run a lot of jobs in background can
> } cause zsh quit or frozen.
> Zsh is attempting to reclaim job table space during the SIGCLD handler.
> I did a quick test and somewhere after a few hundred jobs the child
> handler gets called during a free(), and the handler then calls free()
> again and ends up deadlocked on a system mutex in the guts of glibc.
I noticed that sometimes zsh scripts hangs up at futex(), after run some
> This is especially likely with "zsh -x" because the PS4 prompt is
> allocated and freed each time it's printed. If I leave off the -x,
> the whole loop to 10000 runs to completion.
> However, if I try to reproduce this with bash by frobbing "ulimit -u",
> bash exits for me at exactly the same point as zsh. In fact we just
> had a whole discussion on zsh-workers [*] about bash exiting on fork
> failure, and how zsh either did not but ought to, or exited success
> when it should probably exit with failure.
> I modified t.sh to echo the loop counter so I cound run it without -x
> and still see how many iterations it made.
> schaefer bash --version
> GNU bash, version 3.2.48(1)-release (x86_64-apple-darwin11)
> Copyright (C) 2007 Free Software Foundation, Inc.
> schaefer bash /tmp/t.sh
> /tmp/t.sh: fork: Resource temporarily unavailable
> schaefer echo $?
> No "retry" mentioned. What am I missing?
I was using bash 4.2.10 to do this testing:
% bash --version
GNU bash, version 4.2.10(1)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
Looks like the bash will retry again and again.
> [*] http://www.zsh.org/mla/workers/2012/msg00187.html thread up to
> http://www.zsh.org/mla/workers/2012/msg00201.html or so
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