The following patch addresses problem associated with
process locks when called from cloned process created with 
CLONE_THREAD flag. The fcntl locks are per-process and 
creates a dead-lock for cloned (w/CLONE_THREAD) processes.
It should use tgid instead pid (same way as getpid()).

Thanks,
Saurabh Desai  (sdesai@austin.ibm.com)
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