No one else mentioned this so I will - you are not using LOCK_UN safely. Under 99.9% of all circumstances you will want to have close() handle that for you. I didn't say 100% because while I don't know of any case where you actually would use LOCK_UN, I suppose it exists for a reason so there must be some reason, however obscure and remote, that it exists.

Just don't do it.

In reply to Re: use flock() to determine if other script is running by diotalevi
in thread use flock() to determine if other script is running by Red_Dragon

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