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Re^2: NFS locking with Fcntl

by Preceptor (Deacon)
on May 10, 2016 at 15:42 UTC ( [id://1162639]=note: print w/replies, xml ) Need Help??

in reply to Re: NFS locking with Fcntl
in thread NFS locking with Fcntl

Well, no, it isn't. It's my storage array, and I'm being asked to test locking functionality. I know locking in general (and NFS specifically) are a bit of a 'fuzzy area' when it comes to file locking. And there's huge caveats on the relative interoperability. I'm trying to avoid specific perl modules, simply because this _should_ be language independent. I don't mind knocking up my test cases in C, if that's necessary - but I thought it _should_ be possible using perl built in hooks into C calls.

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Re^3: NFS locking with Fcntl
by taint (Chaplain) on May 10, 2016 at 18:31 UTC

    It's only going to ever be, as good as the OS's implementation of it. So you're mileage will vary greatly, depending on what, and where it's implemented. Version is also a variable to consider. They're all based on the BSD/SUN implementation (links to follow(1, 2)) which dates back to the late 70's to the early 80's, and hasn't changed much, since then. My point being; your results won't have absolute returns -- they all pretty much suck. The client side/implementation is also a factor. Are/will you be testing on/for that, as well?

    The references I provided were just as good for use as modules, as they were for references for a better understanding of the underlying protocol(s). You could have just as easily "cobbled" up something that suites your needs using the code/references therein.

    You also might be interested in mmap for more efficient use of reading/writing of data from/to memory, from disk.


    1) unix history repo
    2) berkeley software distribution

    λɐp ʇɑəɹ⅁ ɐ əʌɐɥ puɐ ʻꜱdləɥ ꜱᴉɥʇ ədoH

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