NumActiveGoroutine.go

func NumActiveGoroutine() int {
	num := 0

	lock(&sched.lock)
	lock(&allglock)
	for gi := 0; gi < len(allgs); gi++ {
		gp := allgs[gi]
		if isSystemGoroutine(gp) {
			continue
		}
		s := readgstatus(gp)
		if s&(_Grunnable|_Grunning|_Gsyscall) > 0 {
			num++
		}
	}
	unlock(&allglock)
	unlock(&sched.lock)

	return num
}