blockmanager: remove unused Pause() API

blockmanager.go

@@ -242,14 +242,6 @@ type isCurrentMsg struct {
 	reply chan bool
 }
 
-// pauseMsg is a message type to be sent across the message channel for
-// pausing the block manager.  This effectively provides the caller with
-// exclusive access over the manager until a receive is performed on the
-// unpause channel.
-type pauseMsg struct {
-	unpause <-chan struct{}
-}
-
 // getCurrentTemplateMsg handles a request for the current mining block template.
 type getCurrentTemplateMsg struct {
 	reply chan getCurrentTemplateResponse
@@ -1811,10 +1803,6 @@ out:
 			case isCurrentMsg:
 				msg.reply <- b.current()
 
-			case pauseMsg:
-				// Wait until the sender unpauses the manager.
-				<-msg.unpause
-
 			case getCurrentTemplateMsg:
 				cur := deepCopyBlockTemplate(b.cachedCurrentTemplate)
 				msg.reply <- getCurrentTemplateResponse{
@@ -2417,16 +2405,6 @@ func (b *blockManager) IsCurrent() bool {
 	return <-reply
 }
 
-// Pause pauses the block manager until the returned channel is closed.
-//
-// Note that while paused, all peer and block processing is halted.  The
-// message sender should avoid pausing the block manager for long durations.
-func (b *blockManager) Pause() chan<- struct{} {
-	c := make(chan struct{})
-	b.msgChan <- pauseMsg{c}
-	return c
-}
-
 // TicketPoolValue returns the current value of the total stake in the ticket
 // pool.
 func (b *blockManager) TicketPoolValue() (dcrutil.Amount, error) {