t.go | 8 ++++----

diff --git a/t.go b/t.go
index 043262066fe8a73b4d30e8f7c2a2ed14b065ab1a..8af13dc2a16b5773782946635ecb7c473b4a2a82 100644
--- a/t.go
+++ b/t.go
@@ -45,14 +45,14 @@ // Returns the state of pieces of the torrent. They are grouped into runs of
 // same state. The sum of the state run lengths is the number of pieces
 // in the torrent.
 func (t *Torrent) PieceStateRuns() []PieceStateRun {
-	t.cl.lock()
-	defer t.cl.unlock()
+	t.cl.rLock()
+	defer t.cl.rUnlock()
 	return t.pieceStateRuns()
 }
 
 func (t *Torrent) PieceState(piece pieceIndex) PieceState {
-	t.cl.lock()
-	defer t.cl.unlock()
+	t.cl.rLock()
+	defer t.cl.rUnlock()
 	return t.pieceState(piece)
 }