Is the GNU trove library thread-safe? I am particularly interested in TObjectDoubleHashMap. I looked at their documentation, but it hasn't mentioned anything, so shall we assume it is not thread-safe?
Is the Trove library thread-safe?
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It has utilities to make it thread safe. See: http://trove4j.sourceforge.net/javadocs/gnu/trove/TCollections.html
Also, since the collections are mostly backed by primitive arrays, you can (usually) safely perform read operations (iteration/get) across multiple threads.
Its not thread safe. You can use synchronized or your own Lock to make it thread safe.