fixes #1681 merge reentrant locks into a single lock and eliminate synchronized blocks #1682
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Validated with user provided test case that exhibited the error after "multiple runs". I have run the test for several thousand iterations on both an Epyc CPU and a dual-CPU Intel enterprise-class server without deadlock.
Note: MacOS build failures are unrelated to this change and have to do with a recent change in the clang compiler. See my related pull request #1683.