Test::Builder keeps around information about each test executed to do its reporting at the end of the test file. This is effectively global data.

So that Test::Builder can work with tests that use thread (or tests for code that uses thread), it has to make sure that that global data is thread-safe, hence the use of sharing.

This is only an issue with ithreads, so it only affects Perls of 5.7.x and later.

In reply to Re: Test::More and semaphore handles on Windows by chromatic
in thread Test::More and semaphore handles on Windows by eyepopslikeamosquito

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