From 9bf844d2dd7e372640bc66991f8a149a501755a9 Mon Sep 17 00:00:00 2001
From: Oliver Tonnhofer <olt@bogosoft.com>
Date: Fri, 25 Nov 2016 09:42:23 +0100
Subject: [PATCH] clear tile list after flush

---
 expire/tilelist.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/expire/tilelist.go b/expire/tilelist.go
index b84fb06..13cc31f 100644
--- a/expire/tilelist.go
+++ b/expire/tilelist.go
@@ -151,6 +151,8 @@ func (tl *TileList) writeTiles(w io.Writer) error {
 }
 
 func (tl *TileList) Flush() error {
+	tl.mu.Lock()
+	defer tl.mu.Unlock()
 	if len(tl.tiles) == 0 {
 		return nil
 	}
@@ -171,6 +173,7 @@ func (tl *TileList) Flush() error {
 	if err != nil {
 		return err
 	}
+	tl.tiles = make(map[tileKey]struct{})
 	// wrote to .tiles~ and now atomically move file to .tiles
 	return os.Rename(fileName, fileName[0:len(fileName)-1])
 }