flock(p1) public

Locks or unlocks a file according to locking_constant (a logical or of the values in the table below). Returns false if File::LOCK_NB is specified and the operation would otherwise have blocked. Not available on all platforms.

Locking constants (in class File): 

   LOCK_EX   | Exclusive lock. Only one process may hold an
             | exclusive lock for a given file at a time.
   ----------+------------------------------------------------
   LOCK_NB   | Don't block when locking. May be combined
             | with other lock options using logical or.
   ----------+------------------------------------------------
   LOCK_SH   | Shared lock. Multiple processes may each hold a
             | shared lock for a given file at the same time.
   ----------+------------------------------------------------
   LOCK_UN   | Unlock.

Example: 

   File.new("testfile").flock(File::LOCK_UN)   #=> 0
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