Allow synchronous messages to be sent from threads other than the main thread...

chrome/common/database_util.cc

 // Copyright (c) 2010 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/common/database_util.h"
 
 #if defined(USE_SYSTEM_SQLITE)
 #include <sqlite3.h>
 #else
 #include "third_party/sqlite/preprocessed/sqlite3.h"
 #endif
 
-#include "chrome/common/db_message_filter.h"
+#include "chrome/common/child_thread.h"
 #include "chrome/common/render_messages.h"
+#include "ipc/ipc_sync_message_filter.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebString.h"
 
 using WebKit::WebKitClient;
 using WebKit::WebString;
 
 WebKitClient::FileHandle DatabaseUtil::databaseOpenFile(
     const WebString& vfs_file_name, int desired_flags,
     WebKitClient::FileHandle* dir_handle) {
-  DBMessageFilter* db_message_filter = DBMessageFilter::GetInstance();
-  int message_id = db_message_filter->GetUniqueID();
+  IPC::PlatformFileForTransit file_handle;
+#if defined(OS_WIN)
+  file_handle = base::kInvalidPlatformFileValue;
+#elif defined(OS_POSIX)
+  file_handle =
+      base::FileDescriptor(base::kInvalidPlatformFileValue, true);
+  base::FileDescriptor dir_handle_rv =
+      base::FileDescriptor(base::kInvalidPlatformFileValue, true);
+#endif
+
+  scoped_refptr<IPC::SyncMessageFilter> filter =
+      ChildThread::current()->sync_message_filter();
+
+  filter->Send(new ViewHostMsg_DatabaseOpenFile(
+      vfs_file_name,
+      desired_flags,
+      &file_handle
+#if defined(OS_POSIX)
+      , &dir_handle_rv
+#endif
+      ));
 
 #if defined(OS_WIN)
-  ViewMsg_DatabaseOpenFileResponse_Params default_response =
-      { base::kInvalidPlatformFileValue };
-#elif defined(OS_POSIX)
-  ViewMsg_DatabaseOpenFileResponse_Params default_response =
-      { base::FileDescriptor(base::kInvalidPlatformFileValue, true),
-        base::FileDescriptor(base::kInvalidPlatformFileValue, true) };
-#endif
-
-  ViewMsg_DatabaseOpenFileResponse_Params result =
-      db_message_filter->SendAndWait(
-          new ViewHostMsg_DatabaseOpenFile(
-              vfs_file_name, desired_flags, message_id),
-          message_id, default_response);
-
-#if defined(OS_WIN)
-  if (dir_handle)
-    *dir_handle = base::kInvalidPlatformFileValue;
-  return result.file_handle;
+  return file_handle;
 #elif defined(OS_POSIX)
   if (dir_handle)
-    *dir_handle = result.dir_handle.fd;
-  return result.file_handle.fd;
+    *dir_handle = dir_handle_rv.fd;
+  return file_handle.fd;
 #endif
 }
 
 int DatabaseUtil::databaseDeleteFile(
     const WebString& vfs_file_name, bool sync_dir) {
-  DBMessageFilter* db_message_filter = DBMessageFilter::GetInstance();
-  int message_id = db_message_filter->GetUniqueID();
-  return db_message_filter->SendAndWait(
-      new ViewHostMsg_DatabaseDeleteFile(vfs_file_name, sync_dir, message_id),
-      message_id, SQLITE_IOERR_DELETE);
+  int rv = SQLITE_IOERR_DELETE;
+  scoped_refptr<IPC::SyncMessageFilter> filter =
+      ChildThread::current()->sync_message_filter();
+  filter->Send(new ViewHostMsg_DatabaseDeleteFile(
+      vfs_file_name, sync_dir, &rv));
+  return rv;
 }
 
-long DatabaseUtil::databaseGetFileAttributes(
-    const WebString& vfs_file_name) {
-  DBMessageFilter* db_message_filter = DBMessageFilter::GetInstance();
-  int message_id = db_message_filter->GetUniqueID();
-  return db_message_filter->SendAndWait(
-      new ViewHostMsg_DatabaseGetFileAttributes(vfs_file_name, message_id),
-      message_id, -1L);
+long DatabaseUtil::databaseGetFileAttributes(const WebString& vfs_file_name) {
+  int32 rv = -1;
+  scoped_refptr<IPC::SyncMessageFilter> filter =
+      ChildThread::current()->sync_message_filter();
+  filter->Send(new ViewHostMsg_DatabaseGetFileAttributes(vfs_file_name, &rv));
+  return rv;
 }
 
-long long DatabaseUtil::databaseGetFileSize(
-    const WebString& vfs_file_name) {
-  DBMessageFilter* db_message_filter = DBMessageFilter::GetInstance();
-  int message_id = db_message_filter->GetUniqueID();
-  return db_message_filter->SendAndWait(
-      new ViewHostMsg_DatabaseGetFileSize(vfs_file_name, message_id),
-      message_id, 0LL);
+long long DatabaseUtil::databaseGetFileSize(const WebString& vfs_file_name) {
+  int64 rv = 0LL;
+  scoped_refptr<IPC::SyncMessageFilter> filter =
+      ChildThread::current()->sync_message_filter();
+  filter->Send(new ViewHostMsg_DatabaseGetFileSize(vfs_file_name, &rv));
+  return rv;
 }