The repodata coalescing tests released the gated build after a fixed 50ms sleep, so a goroutine stalled past that window under -race could miss the in-flight singleflight call, trigger a second build and flake the test.
- add sfWaiters, counting goroutines parked in singleflight Do via runtime.Stack
- release the gate only once every follower is parked on the in-flight call
- drop the trailing sleep from waitFor
Reviewed-on: #177
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent
e4833b6f96