sync.RWMutex.Lock
standard libraryThe 50th most-called standard-library method by production calls. Called 28,589 times across 735 modules; 21,057 of those run outside tests and generated code.
0% in production calls vs 2026-W39 (20,990 → 21,057)
- prod calls
- 21,057
- non-test, non-generated
- all calls
- 28,589
- total callsites
- modules
- 735
- distinct callers
- in loop
- 5%
- of prod calls
- in tests
- 10%
- 2,850 calls
- resolved
- 100%
- to a known target
resolution mix
How each call resolves
How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →
- Concrete method83%A method on a value whose type is known exactly.
- Embedded method17%Reached through an embedded type.
who calls this
Notable callers
Production calls into RWMutex.Lock from notable Go projects. Open one on the map to see what else it hammers.
- Kubernetes 1,552 7%
- NATS 1,225 6%
- Grafana 880 4%
- Cilium 562 3%
- Vault 439 2%
where it's called
Callsites in the wild
12 representative callsites of 28,589, prioritizing in-loop and non-test usage. We link to source, never display it.
- in loop
- in loop
-
cilium/cilium @v1.20.2
in loop - in loop
-
cockroachdb/cockroach @v19.2.12+incompatible
in loop -
miekg/dns @v0.6.117
cmd/atomdns/handlers/url/reload.go:26
in loop - in loop
- in loop
- in loop
- in loop
-
docker/docker @v28.5.2+incompatible
in loop -
etcd-io/etcd @v2.3.8+incompatible
in loop
top callers
The modules that reach for it
The modules that call RWMutex.Lock most in this snapshot.
- github.com/livekit/livekit2,5009%
- github.com/hyperledger/fabric2,1538%
- github.com/nats-io/nats-server/v22,0537%
- github.com/kubernetes/kubernetes7393%
- github.com/seaweedfs/seaweedfs6542%
siblings
More from sync
The other most-called members in this package. See all →