synchronization.py 文件源码

def do_acquire_read_lock(self, wait):
        filedescriptor = self._open(os.O_CREAT | os.O_RDONLY)
        if not wait:
            try:
                fcntl.flock(filedescriptor, fcntl.LOCK_SH | fcntl.LOCK_NB)
                return True
            except IOError:
                os.close(filedescriptor)
                self._filedescriptor.remove()
                return False
        else:
            fcntl.flock(filedescriptor, fcntl.LOCK_SH)
            return True