[bensynapse]

I run Live Tennis API.

WithQueueSize(2) can admit four jobs when producers submit at the same time. Ring.Queue checks capacity before locking the buffer.
Ring.Request also reads count without locking during shutdown. Concurrent readers can trigger a data race and return ErrNoTaskInQueue after closure.

Move both checks inside the existing mutex so they share the lock with buffer updates. Add concurrent capacity and shutdown drain tests.

make test passes with race detection on Go 1.26.8 and 1.27.0. The focused regressions pass 50 runs with -race.
make lint, go build ./... and go vet ./... pass. Both example modules build and execute successfully.

[appleboy]

@bensynapse Thanks.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.73%. Comparing base (cdbf1cb) to head (d4c965a).
⚠️ Report is 86 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   91.29%   92.73%   +1.44%     
==========================================
  Files           7        8       +1     
  Lines         402      413      +11     
==========================================
+ Hits          367      383      +16     
- Misses         28       30       +2     
+ Partials        7        0       -7     

Flag	Coverage Δ
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	?
go-1.22	?
go-1.26	90.31% <100.00%> (?)
go-1.27	92.81% <100.00%> (?)
macos-latest	?
ubuntu-latest	92.73% <100.00%> (+1.69%)	⬆️

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