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import fcntl import time import os class LockError(Exception): """Raised when unable to lock a file.""" def lock_path(path, timeout=0): fd = os.open(path, os.O_CREAT) flags = fcntl.fcntl(fd, fcntl.F_GETFD, 0) flags |= fcntl.FD_CLOEXEC fcntl.fcntl(fd, fcntl.F_SETFD, flags) started = time.time() while True: try: fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) except IOError: if started < time.time() - timeout: raise LockError("Couldn't obtain lock") else: break time.sleep(0.1) def unlock_path(): fcntl.flock(fd, fcntl.LOCK_UN) os.close(fd) return unlock_path