51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/threading/platform_thread.h"
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#include <memory>
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#include "base/feature_list.h"
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namespace base {
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namespace {
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// Whether thread priorities should be used. When disabled,
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// PlatformThread::SetCurrentThreadPriority() no-ops.
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const Feature kThreadPrioritiesFeature{"ThreadPriorities",
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FEATURE_ENABLED_BY_DEFAULT};
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// Whether thread priorities should be used.
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//
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// PlatformThread::SetCurrentThreadPriority() doesn't query the state of the
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// feature directly because FeatureList initialization is not always
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// synchronized with PlatformThread::SetCurrentThreadPriority().
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std::atomic<bool> g_use_thread_priorities(true);
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} // namespace
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// static
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void PlatformThread::SetCurrentThreadPriority(ThreadPriority priority) {
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if (g_use_thread_priorities.load())
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SetCurrentThreadPriorityImpl(priority);
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}
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namespace internal {
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void InitializeThreadPrioritiesFeature() {
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// A DCHECK is triggered on FeatureList initialization if the state of a
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// feature has been checked before. To avoid triggering this DCHECK in unit
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// tests that call this before initializing the FeatureList, only check the
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// state of the feature if the FeatureList is initialized.
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if (FeatureList::GetInstance() &&
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!FeatureList::IsEnabled(kThreadPrioritiesFeature)) {
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g_use_thread_priorities.store(false);
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}
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}
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} // namespace internal
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} // namespace base
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