But using shared locks per fcntl can prevent two different processes from stepping on each other's toes.

I think you've misunderstood--that's exactly what it does NOT do. If there are two filehandles open on a given file (regardless of whether they are opened by one process or two seperate processes), when one of them is closed, all locks are removed. So if process A and process B have shared locks on a file, as soon as A closes his handle, B loses his lock. If process C has two handles and two locks on another file, then both locks are cleared as soon as one handle is closed.

In reply to Re^5: Fcntl() and multiple filehandles by Anonymous Monk
in thread Fcntl() and multiple filehandles by Anonymous Monk

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