autolock

import threading, os, sys, time

class autolock(threading._RLock):
    __enter__ = threading._RLock.acquire
    __leave__ = threading._RLock.release

    def __except__(self, type, value, traceback):
        self.release()
        if type is KeyboardInterrupt:
            self.interrupt = value
            print "leaving with keyboard interrupt", os.getpid()
        else:
            raise type, value, traceback