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import fcntl
import os
import time
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 OSError:
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