+ def _unlock_file(f):
+ fcntl.flock(f, fcntl.LOCK_UN)
+ except ImportError:
+ UNSUPPORTED_MSG = 'file locking is not supported on this platform'
+
+ def _lock_file(f, exclusive):
+ raise IOError(UNSUPPORTED_MSG)
+
+ def _unlock_file(f):
+ raise IOError(UNSUPPORTED_MSG)