crash if fork(2) from another thread

[Hirokazu Yamamoto]

>Your test case worked fine for me with Cygwin 1.7.x.  I don't have a
>copy of 1.5.x handy to test.

> >> I don't see any reason why this shouldn't be allowed.  You should
> >> be able to do anything you want in a child process.
> >I do not think that is true. As per
> ><http://www.opengroup.org/onlinepubs/009695399/functions/fork.html>,
> >RATIONALE, the penultimate paragraph, it is basically undefined
behaviour.
>
> I wrote the current version of cygwin's fork.

I also confirmed previous code worked fine with Cygwin 1.7.
But attached code hangs on Cygwin 1.7. (Actually this is what
test_3_join_in_forked_from_thread is doing)
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