singleton.py 文件源码

def isSingleInstance(flavor_id=""):
    global fp
    basename = os.path.splitext(os.path.abspath(sys.argv[0]))[0].replace(
        "/", "-").replace(":", "").replace("\\", "-") + '-%s' % flavor_id + '.lock'
    lockfile = os.path.normpath(tempfile.gettempdir() + '/' + basename)

    if sys.platform == 'win32':
        try:
            if os.path.exists(lockfile):
                os.unlink(lockfile)
            fp = os.open(
                lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR)
        except OSError:
            return False

    else:  # non Windows
        fp = open(lockfile, 'w')
        try:
            fcntl.lockf(fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
        except IOError:
            return False

    return True