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// +build js
package sync
type WaitGroup struct {
counter int
ch chan struct{}
state1 [3]uint32
}
func (wg *WaitGroup) Add(delta int) {
wg.counter += delta
if wg.counter < 0 {
panic("sync: negative WaitGroup counter")
}
if wg.counter > 0 && wg.ch == nil {
wg.ch = make(chan struct{})
}
if wg.counter == 0 && wg.ch != nil {
close(wg.ch)
wg.ch = nil
}
}
func (wg *WaitGroup) Wait() {
if wg.counter > 0 {
<-wg.ch
}
}
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