Add function barriers to all algorithms

[odow]

Part of #167

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (067521e) to head (ce3522b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #171      +/-   ##
===========================================
+ Coverage   99.75%   100.00%   +0.24%     
===========================================
  Files          12        12              
  Lines        1243      1251       +8     
===========================================
+ Hits         1240      1251      +11     
+ Misses          3         0       -3     

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