From 720f03c6c23c8791e667daeaf923af8246afc2e8 Mon Sep 17 00:00:00 2001
From: James Mills <prologic@shortcircuit.net.au>
Date: Tue, 17 Nov 2020 19:30:44 +1000
Subject: [PATCH] Fix a race condition around .Close() and .Sync()

---
 bitcask.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bitcask.go b/bitcask.go
index 00898c9..2ed5567 100644
--- a/bitcask.go
+++ b/bitcask.go
@@ -87,7 +87,10 @@ func (b *Bitcask) Stats() (stats Stats, err error) {
 // Close() as this is the only way to cleanup the lock held by the open
 // database.
 func (b *Bitcask) Close() error {
+	b.mu.RLock()
+
 	defer func() {
+		b.mu.RUnlock()
 		b.Flock.Unlock()
 		os.Remove(b.Flock.Path())
 	}()
@@ -107,6 +110,8 @@ func (b *Bitcask) Close() error {
 
 // Sync flushes all buffers to disk ensuring all data is written
 func (b *Bitcask) Sync() error {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
 	return b.curr.Sync()
 }