How to justify if a file is locked

最新推荐文章于 2017-06-29 11:07:31 发布

dotphoenix

最新推荐文章于 2017-06-29 11:07:31 发布

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文章标签： flock linux

本文链接：https://blog.youkuaiyun.com/dotphoenix/article/details/51702057

本文介绍了flock命令的两种使用方式：一种是通过指定文件锁并设置持有时间来控制进程的行为；另一种则是尝试获取文件锁并在成功后立即返回，并展示了如何在实际场景中应用这些命令。

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1. Run flock -x /var/lock/lockdev/.1730576435.8206FEBB.0 sleep 30

The call will be blocked until /var/lock/lockdev/.1730576435.8206FEBB.0 is unlocked by another process, then lock the file 30 seconds, 30 seconds later, the call returns ;

If the file is not locked by any processes, the call will lock the file 30 seconds, 30 seconds later, the call returns ;

2. Run flock -x -w 3 /var/lock/lockdev/.1730576435.8206FEBB.0 echo "successful"

if the file /var/lock/lockdev/.1730576435.8206FEBB.0 is not locked by other process, "success" will be displayed soon and then the call returns;

If the file /var/lock/lockdev/.1730576435.8206FEBB.0 is locked by another process, the call will wait 3 seconds, if the other process still does not unlock the file, the call will return, and no message will be displayed.