bug: fix the data race in test on Windows

[panjf2000]

No description provided.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.54 ⚠️

Comparison is base (f6de680) 76.97% compared to head (5f8105c) 76.44%.

❗ Current head 5f8105c differs from pull request most recent head 57f2dda. Consider uploading reports for the commit 57f2dda to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #472      +/-   ##
==========================================
- Coverage   76.97%   76.44%   -0.54%     
==========================================
  Files          23       17       -6     
  Lines        2445     1613     -832     
==========================================
- Hits         1882     1233     -649     
+ Misses        429      292     -137     
+ Partials      134       88      -46     

Flag	Coverage Δ
unittests	76.44% <ø> (-0.54%)	⬇️

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see 6 files with indirect coverage changes

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