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lock.py

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#!/usr/bin/env python

import sys

import threading

try:

import thread

import threading

except ImportError:

thread = None

if thread:

_lock = threading.RLock()

else:

_lock = None

def _acquireLock():

"""

Acquire the module-level lock for serializing access to shared data.

This should be released with _releaseLock().

"""

if _lock:

_lock.acquire()

def _releaseLock():

"""

Release the module-level lock acquired by calling _acquireLock().

"""

if _lock:

_lock.release()

if __name__ == '__main__':

_acquireLock()

print "lock"

_releaseLock()