Create meta table atomically.

chrome/browser/history/download_database.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/history/download_database.h"
 
 #include <limits>
 #include <string>
 #include <vector>
 
@@ skipping 85 matching lines @@
 
 bool DownloadDatabase::EnsureColumnExists(
     const std::string& name, const std::string& type) {
   std::string add_col = "ALTER TABLE downloads ADD COLUMN " + name + " " + type;
   return GetDB().DoesColumnExist("downloads", name.c_str()) ||
          GetDB().Execute(add_col.c_str());
 }
 
 bool DownloadDatabase::InitDownloadTable() {
   CheckThread();
-  bool success = meta_table_.Init(&GetDB(), 0, 0);
-  DCHECK(success);
-  meta_table_.GetValue(kNextDownloadId, &next_id_);
+  GetMetaTable().GetValue(kNextDownloadId, &next_id_);
   if (GetDB().DoesTableExist("downloads")) {
     return EnsureColumnExists("end_time", "INTEGER NOT NULL DEFAULT 0") &&
            EnsureColumnExists("opened", "INTEGER NOT NULL DEFAULT 0");
   } else {
     return GetDB().Execute(kSchema);
   }
 }
 
 bool DownloadDatabase::DropDownloadTable() {
   CheckThread();
@@ skipping 98 matching lines @@
   statement.BindString(2, info.url.spec());
   statement.BindInt64(3, info.start_time.ToTimeT());
   statement.BindInt64(4, info.received_bytes);
   statement.BindInt64(5, info.total_bytes);
   statement.BindInt(6, info.state);
   statement.BindInt64(7, info.end_time.ToTimeT());
   statement.BindInt(8, info.opened ? 1 : 0);
 
   if (statement.Run()) {
     // TODO(benjhayden) if(info.id>next_id_){setvalue;next_id_=info.id;}
-    meta_table_.SetValue(kNextDownloadId, ++next_id_);
+    GetMetaTable().SetValue(kNextDownloadId, ++next_id_);
 
     return db_handle;
   }
   return 0;
 }
 
 void DownloadDatabase::RemoveDownload(DownloadID db_handle) {
   CheckThread();
 
   sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
@@ skipping 55 matching lines @@
     if (num_downloads_deleted > 0) {
       UMA_HISTOGRAM_TIMES("Download.DatabaseRemoveDownloadsTimePerRecord",
                           (1000 * micros) / num_downloads_deleted);
     }
   }
 
   return success;
 }
 
 }  // namespace history