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Diffstat (limited to '')
-rw-r--r-- | security/sandbox/chromium/base/threading/platform_thread.cc | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/security/sandbox/chromium/base/threading/platform_thread.cc b/security/sandbox/chromium/base/threading/platform_thread.cc new file mode 100644 index 0000000000..ae0a4499e7 --- /dev/null +++ b/security/sandbox/chromium/base/threading/platform_thread.cc @@ -0,0 +1,51 @@ +// Copyright 2018 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 "base/threading/platform_thread.h" + +#include <atomic> +#include <memory> + +#include "base/feature_list.h" + +namespace base { + +namespace { + +// Whether thread priorities should be used. When disabled, +// PlatformThread::SetCurrentThreadPriority() no-ops. +const Feature kThreadPrioritiesFeature{"ThreadPriorities", + FEATURE_ENABLED_BY_DEFAULT}; + +// Whether thread priorities should be used. +// +// PlatformThread::SetCurrentThreadPriority() doesn't query the state of the +// feature directly because FeatureList initialization is not always +// synchronized with PlatformThread::SetCurrentThreadPriority(). +std::atomic<bool> g_use_thread_priorities(true); + +} // namespace + +// static +void PlatformThread::SetCurrentThreadPriority(ThreadPriority priority) { + if (g_use_thread_priorities.load()) + SetCurrentThreadPriorityImpl(priority); +} + +namespace internal { + +void InitializeThreadPrioritiesFeature() { + // A DCHECK is triggered on FeatureList initialization if the state of a + // feature has been checked before. To avoid triggering this DCHECK in unit + // tests that call this before initializing the FeatureList, only check the + // state of the feature if the FeatureList is initialized. + if (FeatureList::GetInstance() && + !FeatureList::IsEnabled(kThreadPrioritiesFeature)) { + g_use_thread_priorities.store(false); + } +} + +} // namespace internal + +} // namespace base |