Lock added blocking parameter

[WisdomPill]

Fixes: #596

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 10 lines in your changes missing coverage. Please review.

Project coverage is 63.2%. Comparing base (f34935c) to head (673064a).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/test_backend.py	0.0%	10 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #752     +/-   ##
========================================
- Coverage    63.3%   63.2%   -0.1%     
========================================
  Files          43      43             
  Lines        3215    3223      +8     
  Branches      244     244             
========================================
  Hits         2034    2034             
- Misses       1164    1172      +8     
  Partials       17      17             

Flag	Coverage Δ
mypy	38.0% <13.4%> (-<0.1%)	⬇️
tests	90.5% <100.0%> (+0.2%)	⬆️

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