sqlitelockfile.py 文件源码

def __init__(self, path, threaded=True, timeout=None):
        """
        >>> lock = SQLiteLockFile('somefile')
        >>> lock = SQLiteLockFile('somefile', threaded=False)
        """
        LockBase.__init__(self, path, threaded, timeout)
        self.lock_file = unicode(self.lock_file)
        self.unique_name = unicode(self.unique_name)

        if SQLiteLockFile.testdb is None:
            import tempfile
            _fd, testdb = tempfile.mkstemp()
            os.close(_fd)
            os.unlink(testdb)
            del _fd, tempfile
            SQLiteLockFile.testdb = testdb

        import sqlite3
        self.connection = sqlite3.connect(SQLiteLockFile.testdb)

        c = self.connection.cursor()
        try:
            c.execute("create table locks"
                      "("
                      "   lock_file varchar(32),"
                      "   unique_name varchar(32)"
                      ")")
        except sqlite3.OperationalError:
            pass
        else:
            self.connection.commit()
            import atexit
            atexit.register(os.unlink, SQLiteLockFile.testdb)