import "golang.org/x/tools/godoc/vfs/gatefs"
Package gatefs provides an implementation of the FileSystem interface that wraps another FileSystem and limits its concurrency.
gatefs.go
func New(fs vfs.FileSystem, gateCh chan bool) vfs.FileSystem
New returns a new FileSystem that delegates to fs. If gateCh is non-nil and buffered, it's used as a gate to limit concurrency on calls to fs.