I read that KyotoCabinet is not thread-safe for ithreads (threads, threads::shared) since ithreads are not really threads but just process emulation.

Maybe try to use Coro instead of ithreads. Coro are real threads and the fastest, most reliable threading model in Perl and this should work with KyotoCabinet. And you might also get a performance boost as well :)

In reply to Re^2: Sharing large data structures between threads by hermida
in thread Sharing large data structures between threads by Anonymous Monk

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