From: "Tracy Pierce" <[log in to unmask]>
> great idea, Ken; thanks for your time & trouble.  btw do you see any problem
> with simply using a file's existence as a semaphore?  that is, instead of
> mpex lockfile, just use mpe BUILD XLLOCKED and keep looping until that
> produces cierror=0...

The main drawback is that you are "busy waiting", which uses CPU time when it
doesn't need to.  A smaller drawback is that if a job aborts, a locked file is
automatically unlocked, but a file that exists is not automatically deleted,
so you could have jobs waiting forever until you notice them and fix it
manually.

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