}
	}()
	return true
}

// SetLimit limits the number of active goroutines in this group to at most n.
// A negative value indicates no limit.
//
// Any subsequent call to the Go method will block until it can add an active
// goroutine without exceeding the configured limit.
//
// The limit must not be modified while any goroutines in the group are active.
func (g *Group) SetLimit(n int) {
	if n < 0 {
		g.sem = nil

	"runtime"
	"strconv"
	"sync"
)

var NetLimitGodebug = godebug.New("#cmdgonetlimit")

// NetLimit returns the limit on concurrent network operations
// configured by GODEBUG=cmdgonetlimit, if any.
//
// A limit of 0 (indicated by 0, true) means that network operations should not
// be allowed.
func NetLimit() (int, bool) {
	netLimitOnce.Do(func() {
		s := NetLimitGodebug.Value()
		if s == "" {
			return
		}