[Lldb-commits] [lldb] [lldb] Fix TestThreadExit.py flakiness (PR #190976)

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jimingham wrote:

You could be more accurate than just counting threads here.  Darwin pthreads.h has a pthread_mach_thread_np that will give you the mach port number for a given pthread.  So you could record the mach thread you expected to see gone before join, and then just wait on that one to go away.

https://github.com/llvm/llvm-project/pull/190976