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

[Marc Olzheim]

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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