Multiple Queue improvements: LevelDB Wait on empty, shutdown empty shadow level queue, reduce goroutines etc (#15693)

* move shutdownfns, terminatefns and hammerfns out of separate goroutines

Coalesce the shutdownfns etc into a list of functions that get run at shutdown
rather then have them run at goroutines blocked on selects.

This may help reduce the background select/poll load in certain
configurations.

* The LevelDB queues can actually wait on empty instead of polling

Slight refactor to cause leveldb queues to wait on empty instead of polling.

* Shutdown the shadow level queue once it is empty

* Remove bytefifo additional goroutine for readToChan as it can just be run in run

* Remove additional removeWorkers goroutine for workers

* Simplify the AtShutdown and AtTerminate functions and add Channel Flusher

* Add shutdown flusher to CUQ

* move persistable channel shutdown stuff to Shutdown Fn

* Ensure that UPCQ has the correct config

* handle shutdown during the flushing

* reduce risk of race between zeroBoost and addWorkers

* prevent double shutdown

Signed-off-by: Andrew Thornton <art27@cantab.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/modules/queue/queue_channel_test.go b/modules/queue/queue_channel_test.go
index bca81d50fd..e7abe5b50b 100644
--- a/modules/queue/queue_channel_test.go
+++ b/modules/queue/queue_channel_test.go
@@ -5,7 +5,6 @@
 package queue
 
 import (
-	"context"
 	"testing"
 	"time"
 
@@ -21,7 +20,7 @@ func TestChannelQueue(t *testing.T) {
 		}
 	}
 
-	nilFn := func(_ context.Context, _ func()) {}
+	nilFn := func(_ func()) {}
 
 	queue, err := NewChannelQueue(handle,
 		ChannelQueueConfiguration{
@@ -61,7 +60,7 @@ func TestChannelQueue_Batch(t *testing.T) {
 		}
 	}
 
-	nilFn := func(_ context.Context, _ func()) {}
+	nilFn := func(_ func()) {}
 
 	queue, err := NewChannelQueue(handle,
 		ChannelQueueConfiguration{