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Re: ^4 Flocking and In-place editing

by BazB (Priest)
on Jan 27, 2004 at 09:09 UTC ( #324379=note: print w/replies, xml ) Need Help??


in reply to Re: Re: Re: Flocking and In-place editing
in thread Flocking and In-place editing

It's considered bad form to use LOCK_UN to release the lock on a filehandle - there is the potential for buffering to ruin your day if another process starts writing to the file before the current process closes the filehandle and flushes any data to disk.

Closing the filehandle will ensure the data on disk is consistent, as buffered data will be flushed, and the flock is released automatically.

If you're locking a semaphore file, as your example here suggests, it's somewhat of a non-issue, but it should be considered for other cases.


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That way everyone learns.

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[1nickt]: choroba Is it a safe assumption that if there is a threaded perl then the user will want to use Thread::Queue?
[hippo]: Why not?
[1nickt]: That's good! I suppose the cpanfile would be the same however the app distro is structured ...
[1nickt]: hippo no reason why not other than wanting to check an assumption :-)
[hippo]: For a self-contained application which can therefore ensure thread safety it seems like a sensible approach.

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