linux lock使用方法

shell lock

#!/bin/bash

TMP_FILE=`date +%Y_%m_%d_%H_%M`;
TMP_FILE="/tmp/"$TMP_FILE".tmp";

echo $TMP_FILE;

echo "aaa";
(
        echo "bbb";
        flock -s 200
        sleep 100;
        echo "ccc";
        # ... commands executed under lock ...
)200>$TMP_FILE

rm -f $TMP_FILE
~               

 

 

shell lock timeout

#!/bin/bash

TMP_FILE="/tmp/a.tmp";

echo $TMP_FILE;

echo "aaa";
(
        echo "bbb"

        flock -w 10 200
        echo "ok pass lock..";

        sleep 100;
        echo "ccc";
)200>$TMP_FILE

rm -f $TMP_FILE