Fix race in impl/memory.

impl/memory/gkvlite_utils.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package memory
 
 import (
         "bytes"
         "runtime"
         "sync"
@@ skipping 50 matching lines @@
 }
 
 // memStore is a gkvlite.Store which will panic for anything which might
 // otherwise return an error.
 //
 // This is reasonable for in-memory Store objects, since the only errors that
 // should occur happen with file IO on the underlying file (which of course
 // doesn't exist).
 type memStore gkvlite.Store
 
-func (memStore) ImATestingSnapshot() {}
+func (*memStore) ImATestingSnapshot() {}
 
 func newMemStore() *memStore {
         ret, err := gkvlite.NewStore(nil)
         memoryCorruption(err)
         return (*memStore)(ret)
 }
 
 func (ms *memStore) Snapshot() *memStore {
         ret := (*memStore)((*gkvlite.Store)(ms).Snapshot())
         runtime.SetFinalizer((*gkvlite.Store)(ret), func(s *gkvlite.Store) {
@@ skipping 52 matching lines @@
 func (mc *memCollection) VisitItemsAscend(target []byte, withValue bool, visitor gkvlite.ItemVisitor) {
         err := (*gkvlite.Collection)(mc).VisitItemsAscend(target, withValue, visitor)
         memoryCorruption(err)
 }
 
 func (mc *memCollection) GetTotals() (numItems, numBytes uint64) {
         numItems, numBytes, err := (*gkvlite.Collection)(mc).GetTotals()
         memoryCorruption(err)
         return
 }