Commits on Aug 27, 2021

1. Make sure opal_start_thread always spawns pthreads …

   Users of `opal_start_thread` (btl/tcp, ft, smcuda, progress thread)
   may spawn threads that may block in functions unaware of argobots
   or qthreads (e.g., libevent or read(3)). If we spawn an argobot or
   qthread instead of a pthread the thread executing the argobot or
   qthread (potentially the main thread) blocks, leading to a deadlock
   situation. Open MPI expects the semantics of a pthread so
   we should handle all internal threads as such.
   
   Signed-off-by: Joseph Schuchart <schuchart@icl.utk.edu>

   

   devreal committed Aug 27, 2021
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