Commits on Feb 6, 2024

1. Make thread._rlock thread-safe in free-threaded builds …

   The ID of the owning thread (`rlock_owner`)  may be accessed by
   multiple threads without holding the underlying lock; relaxed
   atomics are used in place of the previous loads/stores.
   
   The number of times that the lock has been acquired (`rlock_count`)
   is only ever accessed by the thread that holds the lock; we do not
   need to use atomics to access it.
   
   The embedded lock (`rlock_lock`) is already thread-safe.

   

   mpage committed Feb 6, 2024
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