Found a subtle bug caused by data race.

[tohtsky]

No description provided.

[codecov-commenter]

Codecov Report

Merging #3 (114de6d) into main (87609e0) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
- Coverage   95.33%   95.22%   -0.12%     
==========================================
  Files          13       13              
  Lines         900      900              
==========================================
- Hits          858      857       -1     
- Misses         42       43       +1     

Impacted Files	Coverage Δ
cpp_sources/child_worker.cpp	100.00% <100.00%> (ø)
cpp_sources/trainer_base.cpp	98.19% <100.00%> (+0.01%)	⬆️
cpp_sources/wrapper.cpp	96.55% <0.00%> (-0.58%)	⬇️

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