From ccbb33c35a2024dde33c5b799a5f5009003551cf Mon Sep 17 00:00:00 2001
From: Ian Rees <ian@ianrees.net>
Date: Thu, 5 Dec 2024 18:03:25 -0800
Subject: [PATCH] Fix concurrent map write (#292)

* Fix concurrent map write
---
 cmd/tlserver/main.go      | 1 -
 internal/clock/swcache.go | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/cmd/tlserver/main.go b/cmd/tlserver/main.go
index ed24f6cd..6e1bc5d5 100644
--- a/cmd/tlserver/main.go
+++ b/cmd/tlserver/main.go
@@ -106,7 +106,6 @@ func (cmd *ServerCommand) AddFlags(fl *pflag.FlagSet) {
 	fl.BoolVar(&cmd.LoadAdmins, "load-admins", false, "Load admin polygons from database into memory")
 	fl.IntVar(&cmd.LoaderBatchSize, "loader-batch-size", 100, "GraphQL Loader batch size")
 	fl.IntVar(&cmd.LoaderStopTimeBatchSize, "loader-stop-time-batch-size", 1, "GraphQL Loader batch size for StopTimes")
-
 }
 
 func (cmd *ServerCommand) Parse(args []string) error {
diff --git a/internal/clock/swcache.go b/internal/clock/swcache.go
index 436905be..52a8df7c 100644
--- a/internal/clock/swcache.go
+++ b/internal/clock/swcache.go
@@ -36,8 +36,8 @@ func NewServiceWindowCache(db sqlx.Ext) *ServiceWindowCache {
 
 func (f *ServiceWindowCache) Get(ctx context.Context, fvid int) (ServiceWindow, bool, error) {
 	f.lock.Lock()
+	defer f.lock.Unlock()
 	a, ok := f.fvslWindows[fvid]
-	f.lock.Unlock()
 	if ok {
 		return a, ok, nil
 	}