Oh, after carefully check the man page of flock(1) in Linux, it supports timeout. So the last value of this program disappears. Please ignore my ignorance and disturbance. I wish I could delete the post but there is no way to do it.
64 karma · joined April 30, 2022
I've never used BSD. After reading the link provided by you, I think my program becomes no value, if there is a Linux version of lockf(1). Sad.
The scene for this program is that I don't know all the tasks.
Namely, tasks are generated in real time.
1. I posted some task to the queue and continue my work, then the work make me post another work. e. g. in a shell script
2. For server application to queue tasks