Github user jeking3 commented on the issue: https://github.com/apache/thrift/pull/1103 The latest AppVeyor build failed because the thread factory monitor test assumes that a monitor wait(milliseconds) will wake up at "milliseconds" however the only guarantee is that it will sleep "at least milliseconds". As we see in a busy Appveyor build environment, there are significant delays, but it meets the criteria of sleeping "at least milliseconds" which is the only guarantee, so I am going to fix that test.
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