Sample
golang.org/x/sync 0.22.0: Configure errgroup concurrency limits and semaphore capacity without zero-limit deadlocks, TryGo work dropping, unhandled dynamic limit reconfiguration panics, or zero-capacity Acquire hanging
Verified sample for golang golang.org/x/sync 0.22.0: Configure errgroup concurrency limits and semaphore capacity without zero-limit deadlocks, TryGo work…
sha256:76e608f62b6225cd144c98ac7e79f943331a1d88b9450ee339355970fa972627
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
go linux x64 go go gomod
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| go 1.26 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-17 |
| go 1.26 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · golang@1 |
2026-08-18 |
Case
HOW- Goal
- Configure errgroup concurrency limits and semaphore capacity without zero-limit deadlocks, TryGo work dropping, unhandled dynamic limit reconfiguration panics, or zero-capacity Acquire hanging
- Packages
- Symbols
-
- errgroup.Group.SetLimit
- Group.Go
- Group.TryGo
- semaphore.NewWeighted
- Weighted.Acquire
- Environment
- go
- Created
- 2026-08-17T17:08:48Z
Contract
- assert configuring SetLimit(0) deadlocks errgroup.Go calls immediately and causes TryGo to drop 100% of submitted tasks rather than enabling unlimited concurrency
- assert configuring unlimited concurrency in errgroup strictly requires a negative limit such as SetLimit(-1) to reset the internal semaphore channel to nil
- assert reconfiguring SetLimit with a non-negative value while worker goroutines are actively running panics immediately with active worker count
- assert configuring semaphore.NewWeighted with 0 capacity causes Acquire to block indefinitely waiting for context cancellation rather than returning an immediate error
Files
- NOTES.md
- csx.json
- go.mod
- go.sum
- sync_test.go