util/levelmu/levelmu.go | 39 ---------------------------------------

diff --git a/util/levelmu/levelmu.go b/util/levelmu/levelmu.go
deleted file mode 100644
index 5970d72111d1ab125c038dbb3d2eb42e83ce1f3f..0000000000000000000000000000000000000000
--- a/util/levelmu/levelmu.go
+++ /dev/null
@@ -1,39 +0,0 @@
-package levelmu
-
-import (
-	"sync"
-)
-
-type LevelMutex struct {
-	mus []sync.Mutex
-	// Protected by the very last mutex.
-	lastLevel int
-}
-
-func (lm *LevelMutex) Init(levels int) {
-	if lm.mus != nil {
-		panic("level mutex already initialized")
-	}
-	lm.mus = make([]sync.Mutex, levels)
-}
-
-func (lm *LevelMutex) Lock() {
-	lm.LevelLock(0)
-}
-
-func (lm *LevelMutex) Unlock() {
-	stopLevel := lm.lastLevel
-	for i := len(lm.mus) - 1; i >= stopLevel; i-- {
-		lm.mus[i].Unlock()
-	}
-}
-
-func (lm *LevelMutex) LevelLock(level int) {
-	if level >= len(lm.mus) {
-		panic("lock level exceeds configured level count")
-	}
-	for l := level; l < len(lm.mus); l++ {
-		lm.mus[l].Lock()
-	}
-	lm.lastLevel = level
-}