You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: advisory_locks.go
    path of file: ./repos/tidb/pkg/session
    
    the code of the file until where you have to start completion: // Copyright 2022 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/L
    
func (a *advisoryLock) GetLock(lockName string, timeout int64) error {
	a.ctx = kv.WithInternalSourceType(a.ctx, kv.InternalTxnOthers)
	_, err := a.session.ExecuteInternal(a.ctx, "SET innodb_lock_wait_timeout = %?", timeout)
	if err != nil {
		return err
	}
	_, err = a.session.ExecuteInternal(a.ctx, "BEGIN PESSIMISTIC")
	if err != nil {
		return err
	}
	_, err = a.session.ExecuteInternal(a.ctx, "INSERT INTO mysql.advisory_locks (lock_name) VALUES (%?)", lockName)
	if err != nil {
		// We couldn't acquire the LOCK so we close the session cleanly
		// and return the error to the caller. The caller will need to interpret
		// this differently if it is lock wait timeout or a deadlock.
		a.Close()
		return err
	}
	a.referenceCount++
	return nil
}