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Pull Request: better disk caching behavior for concurrent lookups
Jeremy Selan <jeremy...@...>
Previously, if one loaded a file (LUT) that wasnt in cache, this would block
concurrent access of the file caches, even for different files. With this
update, lookups for different files are non-blocking. However, lookups on
the same file are blocking; a lut should never be loaded twice from disk even
when concurrently used.
This change was added so image viewers which need real time performance can
efficienly use a 'prefetch' thread to see the file caches ahead of time. This is
particularly useful when used when playing clips with per-shot 3-D LUTs.
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