threads/76690: fork hang in child for (-lc_r & -lthr)

[Farid Bavandpouri]

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-----Original Message-----
From: owner-freebsd-threads at freebsd.org
[mailto:owner-freebsd-threads at freebsd.org] On Behalf Of Marc Olzheim
Sent: Monday, October 24, 2005 9:59 AM
To: Daniel Eischen
Cc: Marc Olzheim; freebsd-threads at freebsd.org; Marc Olzheim; David Xu;
Sven Berkvens-Matthijsse
Subject: Re: threads/76690: fork hang in child for (-lc_r & -lthr)

On Mon, Oct 24, 2005 at 12:41:01PM -0400, Daniel Eischen wrote:
> > But then the free() in the child process may be using an unstable 
> > state of the malloc system (because if you don't acquire the lock 
> > before the fork(), malloc() may be busy in the middle of the
fork()).
> 
> I don't think that can happen because libc_r will not switch out a 
> thread that is in a critical region (and libc locks are critical
> regions) until it leaves the region.

Well, that would be the idea, but GDB traces prove otherwise... :P And
that's why the patch prevents the test program in the PR from hanging.

Marc
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