[1.7] flock change breaks autotools 'make -j2'

[Eric Blake]

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According to Corinna Vinschen on 4/17/2009 4:01 AM:
> Default question:  Do you have a simple testcase to reproduce this
> problem?  I'm going to play with the lock.pl perl script from
> http://lists.gnu.org/archive/html/bug-automake/2009-04/msg00053.html but
> I don't know if I can get it working.  Perl isn't exactly my domain.
> I'd prefer a testcase in C.

So would I.  I'm not even sure whether perl was using flock or
lockf/fcntl.  Do you still need me to try and write a STC, or at least
test how perl behaves with your first patch?  At least with this report,
it is two separate processes touching the same files, so the bug you found
in inter-thread locking should not affect this particular situation.

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

Eric Blake             ebb9@byu.net
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