simplify the synchronization routine using counter
simplify the synchronization routine using counter

wkentaro/chainer,ktnyt/chainer,jnishi/chainer,wkentaro/chainer,ktnyt/chainer,okuta/chainer,aonotas/chainer,niboshi/chainer,anaruse/chainer,hvy/chainer,keisuke-umezawa/chainer,ktnyt/chainer,jnishi/chainer,hvy/chainer,okuta/chainer,niboshi/chainer,jnishi/chainer,hvy/chainer,chainer/chainer,niboshi/chainer,ronekko/chainer,keisuke-umezawa/chainer,ktnyt/chainer,jnishi/chainer,wkentaro/chainer,chainer/chainer,chainer/chainer,pfnet/chainer,tkerola/chainer,niboshi/chainer,chainer/chainer,keisuke-umezawa/chainer,okuta/chainer,okuta/chainer,hvy/chainer,keisuke-umezawa/chainer,rezoo/chainer,wkentaro/chainer