#!/bin/bash # Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you 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/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, # software distributed under the License is distributed on an # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, either express or implied. See the License for the # specific language governing permissions and limitations # under the License. rm /tmp/biglock* echo #Test task A would acquire one lock again and again in little interval ./test_task.sh A 0.3 & sleep 1 #At the same time, task B would try to acquire the lock as well. ./test_task.sh B 0.5 & #For the original version, task B would essiental fail, because task A do it read end pkill test_task