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cmd/go: modload should use a read-write lock to improve concurrency #74311

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cmd/go: modload should use a read-write lock to improve concurrency #74311

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6 changes: 3 additions & 3 deletions src/cmd/go/internal/modload/init.go
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Original file line number Diff line number Diff line change
Expand Up @@ -149,7 +149,7 @@ type MainModuleSet struct {
// highest replaced version of each module path; empty string for wildcard-only replacements
highestReplaced map[string]string

indexMu sync.Mutex
indexMu sync.RWMutex
indices map[module.Version]*modFileIndex
}

Expand Down Expand Up @@ -228,8 +228,8 @@ func (mms *MainModuleSet) GetSingleIndexOrNil() *modFileIndex {
}

func (mms *MainModuleSet) Index(m module.Version) *modFileIndex {
mms.indexMu.Lock()
defer mms.indexMu.Unlock()
mms.indexMu.RLock()
defer mms.indexMu.RUnlock()
return mms.indices[m]
}

Expand Down