base/threading/platform_thread_win.h

// 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.

#ifndef BASE_THREADING_PLATFORM_THREAD_WIN_H_
#define BASE_THREADING_PLATFORM_THREAD_WIN_H_

#include "base/threading/platform_thread.h"

#include "base/base_export.h"
#include "base/feature_list.h"

namespace base {

namespace features {

// Use THREAD_MODE_BACKGROUND_BEGIN instead of THREAD_PRIORITY_LOWEST for
// ThreadPriority::BACKGROUND threads. This lowers the disk and network I/O
// priority of the thread in addition to the CPU scheduling priority. MSDN
// recommends using this setting for threads that perform background work.
// https://docs.microsoft.com/en-us/windows/desktop/api/processthreadsapi/nf-processthreadsapi-setthreadpriority
BASE_EXPORT extern const Feature kWindowsThreadModeBackground;

}  // namespace features

namespace internal {

// The value returned by ::GetThreadPriority() after background thread mode is
// enabled on Windows 7. Exposed for unit tests.
constexpr int kWin7BackgroundThreadModePriority = 4;

// Assert that the memory priority of |thread| is |memory_priority|. No-op on
// Windows 7 because ::GetThreadInformation() is not available. Exposed for unit
// tests.
BASE_EXPORT void AssertMemoryPriority(HANDLE thread, int memory_priority);

}  // namespace internal

}  // namespace base

#endif  // BASE_THREADING_PLATFORM_THREAD_WIN_H_