transport: replace (chan bool) with (chan struct{})

(chan struct{}) take ZERO memory footprint.

TODO.rst

@@ -1,6 +1,3 @@
-* use chan struct{} instead of chan bool for synchronization.
-* there is a leak in verify/* use mmprof to fix it.
-* add code coverage for verification.
 * find a way to add SendHeartbeat() in verify/{client.go,server.go}
 * logs are commented, wrap them under log flag.
 * document reserved tags.
@@ -17,3 +14,4 @@
 * run travis for go1.4, go1.5, go1.6
 * try gofast on raspberry-pi.
 * support snappy compression.
+* add code coverage for verification.

transport.go

@@ -99,7 +99,7 @@ type Transport struct {
 	aliveat  int64
 	txch     chan *txproto
 	rxch     chan rxpacket
-	killch   chan bool
+	killch   chan struct{}
 
 	// memory pools
 	p_strms  chan *Stream // for locally initiated streams
@@ -140,7 +140,7 @@ func NewTransport(name string, conn Transporter, version Version, config map[str
 		conn:   conn,
 		txch:   make(chan *txproto, chansize+batchsize),
 		rxch:   make(chan rxpacket, chansize),
-		killch: make(chan bool),
+		killch: make(chan struct{}),
 
 		msgpools: make(map[uint64]*sync.Pool),