def flock(filename=None):
"""simple blocking exclusive file locker
eg:
with flock(lockfilepath):
...
"""
with open(filename, 'a') as fh:
_flock(fh, LOCK_EX)
yield
_flock(fh, LOCK_UN)
def locked(filename=None):
"""
:param filename:
:return: True if file is locked.
"""
with open(filename, 'a') as fh:
try:
_flock(fh, LOCK_EX | LOCK_NB)
ret = False
except IOError as e:
if e.errno == errno.EAGAIN:
log.debug('{0} is locked: {1}'.format(filename, e))
ret = True
else:
ret = False
return ret
