func (self *CpuAgent) mine(block *types.Block, stop <-chan struct{}) {
glog.V(logger.Debug).Infof("(re)started agent[%d]. mining...\n", self.index)
// Mine
nonce, mixDigest := self.pow.Search(block, stop)
if nonce != 0 {
self.returnCh <- block.WithMiningResult(nonce, common.BytesToHash(mixDigest))
} else {
self.returnCh <- nil
}
}