mirror of
https://github.com/quantum5/2048.git
synced 2025-04-24 04:21:58 -04:00
29 lines
838 B
Python
29 lines
838 B
Python
"""An implementation of a file locker."""
|
|
|
|
# Import msvcrt if possible.
|
|
try:
|
|
import msvcrt
|
|
except ImportError:
|
|
# Currently no linux solution with fcntl.
|
|
raise RuntimeError('Linux locker not written yet.')
|
|
else:
|
|
class FileLock(object):
|
|
def __init__(self, fd, size=65536):
|
|
if hasattr(fd, 'fileno') and callable(fd.fileno):
|
|
self.fd = fd.fileno()
|
|
else:
|
|
self.fd = fd
|
|
self.size = size
|
|
|
|
def acquire(self, blocking=True):
|
|
msvcrt.locking(self.fd, (msvcrt.LK_NBLCK, msvcrt.LK_LOCK)[blocking], self.size)
|
|
|
|
def release(self):
|
|
msvcrt.locking(self.fd, msvcrt.LK_UNLCK, self.size)
|
|
|
|
def __enter__(self):
|
|
self.acquire()
|
|
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
self.release()
|