flock--nonblock

2021年6月2日—預設值，一次只能有一支程序能獲得所有權。-n,--nb,--nonblock,如果不能獲得所有權，不會等待，直接結束程式。-s,--shared,可以共用所有權，多支 ...,Thisutilitymanagesflock(2)locksfromwithinshellscriptsorthecommandline.Thefirstandsecondformswrapsthelockaroundtheexecutingacommand, ...,Iftheenvironmentvariable$FLOCKERisnotsettotheshellscriptthatisbeingrun,thenexecuteflockandgrabanexclusiveno...

參考資訊如下
flock – Manage locks from shell scripts

2021年6月2日 — 預設值，一次只能有一支程序能獲得所有權。 -n, --nb, --nonblock, 如果不能獲得所有權，不會等待，直接結束程式。 -s, --shared, 可以共用所有權，多支 ...

flock(1): Manage locks from shell scripts

This utility manages flock(2) locks from within shell scripts or the command line. The first and second forms wraps the lock around the executing a command, ...

flock(1)

If the environment variable $FLOCKER is not set to the shell script that is being run, then execute flock and grab an exclusive non-blocking lock (using the ...

flock(2)

A process may hold only one type of lock (shared or exclusive) on a file. Subsequent flock() calls on an already locked file will convert an existing lock to ...

flock(1) — Linux manual pages

If the env var $FLOCKER is not set to the shell script that is being run, then execute flock and grab an exclusive non-blocking lock (using the script itself as ...

Linux 小撇步：利用flock來做同步和非同步應用

2014年1月3日 — -n, --nb, --nonblock Fail (with an exit code of 1) rather than wait if the lock cannot be immediately acquired. -w, --wait, --timeout ...

Linux 小撇步：利用flock 來做同步和非同步應用

-n, --nb, --nonblock Fail (with an exit code of 1) rather than wait if the lock cannot be immediately acquired. -w, --wait, --timeout seconds Fail (with an ...

Difference between return value of non

2014年6月26日 — But if flock with LOCK_NB returns false and wouldblock=0 then it means something really bad happen and flock didn't even consider waiting to ...

Can Linux flock(fd, LOCK_EX

2014年1月14日 — ... flock(fd, LOCK_EX|LOCK_NB) . As indicated, the attempts are non-blocking, so one of the two processes is supposed to fail with EWOULDBLOCK .

linux使用flock文件锁

2018年7月12日 — -n, --nonblock: 如果没有立即获得锁，直接失败而不是等待 -w, --timeout: 如果没有立即获得锁，等待指定时间 -o, --close: 在运行命令前关闭文件的 ...