go/src/cmd/vendor/golang.org/x/mod/sumdb/cache.go

type parCache …

type cacheEntry …

// Do calls the function f if and only if Do is being called for the first time with this key.
// No call to Do with a given key returns until the one call to f returns.
// Do returns the value returned by the one call to f.
func (c *parCache) Do(key interface{ … }

// Get returns the cached result associated with key.
// It returns nil if there is no such result.
// If the result for key is being computed, Get does not wait for the computation to finish.
func (c *parCache) Get(key interface{ … }