Use APPLE_NTHREADS when querying number of threads

[ViralBShah]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.22%. Comparing base (05061e9) to head (96711fd).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #89   +/-   ##
=======================================
  Coverage   76.22%   76.22%           
=======================================
  Files           4        4           
  Lines         265      265           
=======================================
  Hits          202      202           
  Misses         63       63           

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