FcntlLock is a module to do file locking in an object oriented fashion using
the fcntl(2) system call. This allows locks on parts of a file as well as on
the whole file and overcomes some known problems with flock(2), on which Perls
flock() function is based by default.

WWW: http://search.cpan.org/dist/File-FcntlLock/
