simplelock.py 文件源码

def trylock(self):
        if self.lockfile is None or self.lockfile.closed:
            self.lockfile = open(self.path, 'a')
        try:
            if os.name == 'nt':
                msvcrt.locking(self.lockfile.fileno(), msvcrt.LK_NBLCK, 1)
            else:
                fcntl.lockf(self.lockfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
            return True
        except IOError,e:
            if e.errno in (errno.EACCES, errno.EAGAIN):
                return False
            raise