services.py 文件源码

def lock_file_nonblocking(fileobj):
    # Use fcntl.flock instead of fcntl.lockf. lockf on pypy 1.7 seems
    # to ignore existing locks.

    try:
        fcntl.flock(fileobj, fcntl.LOCK_EX | fcntl.LOCK_NB)
    except IOError, ioe:
        if ioe.errno not in (errno.EACCES, errno.EAGAIN):
            raise
        return False
    return True