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rlock creates NFS safe lockfiles. it can optionally run a program while
holding the lock, ensuring lockfile removal on program exit. if a program
is specified to be run rlock will spawn a background thread to kept the
lockfile 'fresh' by touching it at a regular interval. in this way a lease
is maintained on the lockfile and other processes attempting to obtain the
lock can determine that it is in use.
WWW: https://github.com/ahoward/lockfile
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