base/observer_list_threadsafe.cc

   1 // Copyright 2017 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/observer_list_threadsafe.h"
   6 #include "base/compiler_specific.h"
   7 #include "third_party/abseil-cpp/absl/base/attributes.h"
   8
   9 namespace base {
  10 namespace internal {
  11
  12 ABSL_CONST_INIT thread_local const ObserverListThreadSafeBase::
  13     NotificationDataBase* current_notification = nullptr;
  14
  15 // static
  16 const ObserverListThreadSafeBase::NotificationDataBase*&
  17 ObserverListThreadSafeBase::GetCurrentNotification() {
  18   // Workaround false-positive MSAN use-of-uninitialized-value on
  19   // thread_local storage for loaded libraries:
  20   // https://github.com/google/sanitizers/issues/1265
  21   MSAN_UNPOISON(
  22       &current_notification,
  23       sizeof(const ObserverListThreadSafeBase::NotificationDataBase*));
  24
  25   return current_notification;
  26 }
  27
  28 }  // namespace internal
  29 }  // namespace base