From 3a1b152562a98de231f73e35c4df03994268328e Mon Sep 17 00:00:00 2001
From: Ben Johnson <benbjohnson@yahoo.com>
Date: Sat, 1 Mar 2014 12:53:05 -0700
Subject: Ignore multiple transaction commit/rollback/close.

---
 rwtransaction.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'rwtransaction.go')

diff --git a/rwtransaction.go b/rwtransaction.go
index f47597f..776cf55 100644
--- a/rwtransaction.go
+++ b/rwtransaction.go
@@ -82,6 +82,10 @@ func (t *RWTransaction) DeleteBucket(name string) error {
 // Commit writes all changes to disk and updates the meta page.
 // Returns an error if a disk write error occurs.
 func (t *RWTransaction) Commit() error {
+	if t.db == nil {
+		return nil
+	}
+
 	defer t.close()
 
 	// TODO(benbjohnson): Use vectorized I/O to write out dirty pages.
@@ -119,7 +123,10 @@ func (t *RWTransaction) Rollback() {
 }
 
 func (t *RWTransaction) close() {
-	t.db.rwlock.Unlock()
+	if t.db != nil {
+		t.db.rwlock.Unlock()
+		t.db = nil
+	}
 }
 
 // allocate returns a contiguous block of memory starting at a given page.
-- 
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