func (s *SequentialWaitGroup) Done(sequence int64) {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	_, ok := s.semaphores[sequence]
	if ok {
		s.semaphores[sequence]--
		if s.semaphores[sequence] == 0 {
			delete(s.semaphores, sequence)
			s.change.Broadcast()
		}
	}
}
func (s *SequentialWaitGroup) Done(sequence int64) {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	_, ok := s.semaphores[sequence]
	if ok {
		s.semaphores[sequence]--
		if s.semaphores[sequence] == 0 {
			delete(s.semaphores, sequence)
			s.change.Broadcast()
		}
	}
}
func ( s * SequentialWaitGroup ) Done ( sequence int64 ) { s . mutex . Lock ( ) defer s . mutex . Unlock ( ) _ , ok := s . semaphores [ sequence ] if ok { s . semaphores [ sequence ] -- if s . semaphores [ sequence ] == 0 { delete ( s . semaphores , sequence ) s . change . Broadcast ( ) } } }
// Done decrements the waitgroup at the given sequence by one
Done decrements the waitgroup at the given sequence by one