Re: Issue 867 in lilypond: lilypond-book can have hash collisions

[lilypond]

Comment #1 on issue 867 by percival.music.ca: lilypond-book can have hash  
collisions
http://code.google.com/p/lilypond/issues/detail?id=867

Han-Wen: A more elaborate solution would be either some kind of locking, or  
to
check whether the .ps / .pdf exists before actually processing the
.ly; the latter is still suscepitible to races, though, but a check
could make the opportunity window smaller.

Graham: I think a .lock would be good.  That's the typical solution to
everything when it comes to parallel processing.  :)

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