55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
// Copyright 2019 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/scoped_thread_priority.h"
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#include "base/location.h"
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#include "base/threading/platform_thread.h"
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#include "base/trace_event/trace_event.h"
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namespace base {
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namespace internal {
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ScopedMayLoadLibraryAtBackgroundPriority::
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ScopedMayLoadLibraryAtBackgroundPriority(const Location& from_here) {
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TRACE_EVENT_BEGIN2("base", "ScopedMayLoadLibraryAtBackgroundPriority",
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"file_name", from_here.file_name(), "function_name",
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from_here.function_name());
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}
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bool ScopedMayLoadLibraryAtBackgroundPriority::OnScopeFirstEntered() {
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#if defined(OS_WIN)
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const base::ThreadPriority priority =
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PlatformThread::GetCurrentThreadPriority();
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if (priority == base::ThreadPriority::BACKGROUND) {
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original_thread_priority_ = priority;
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PlatformThread::SetCurrentThreadPriority(base::ThreadPriority::NORMAL);
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TRACE_EVENT_BEGIN0(
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"base",
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"ScopedMayLoadLibraryAtBackgroundPriority : Priority Increased");
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}
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#endif // OS_WIN
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return true;
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}
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ScopedMayLoadLibraryAtBackgroundPriority::
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~ScopedMayLoadLibraryAtBackgroundPriority() {
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// Trace events must be closed in reverse order of opening so that they nest
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// correctly.
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#if defined(OS_WIN)
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if (original_thread_priority_) {
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TRACE_EVENT_END0(
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"base",
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"ScopedMayLoadLibraryAtBackgroundPriority : Priority Increased");
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PlatformThread::SetCurrentThreadPriority(original_thread_priority_.value());
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}
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#endif // OS_WIN
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TRACE_EVENT_END0("base", "ScopedMayLoadLibraryAtBackgroundPriority");
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}
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} // namespace internal
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} // namespace base
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