fix:Remove useless coroutines

processor.go

@@ -193,7 +193,6 @@ func (p *processor) exec() {
 		lease := base.NewLease(leaseExpirationTime)
 		deadline := p.computeDeadline(msg)
 		p.starting <- &workerInfo{msg, time.Now(), deadline, lease}
-		go func() {
 		defer func() {
 			p.finished <- msg
 			<-p.sema // release token
@@ -250,7 +249,6 @@ func (p *processor) exec() {
 			}
 			p.handleSucceededMessage(lease, msg)
 		}
-		}()
 	}
 }