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// Copyright 2015 The Chromium Authors
// 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_INTERNAL_POSIX_H_
#define BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
#include <optional>
#include "base/base_export.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
namespace base {
namespace internal {
struct ThreadTypeToNiceValuePair {
ThreadType thread_type;
int nice_value;
};
struct ThreadPriorityToNiceValuePairForTest {
ThreadPriorityForTest priority;
int nice_value;
};
// The elements must be listed in the order of increasing priority (lowest
// priority first), that is, in the order of decreasing nice values (highest
// nice value first).
extern const ThreadTypeToNiceValuePair kThreadTypeToNiceValueMap[7];
// The elements must be listed in the order of decreasing priority (highest
// priority first), that is, in the order of increasing nice values (lowest nice
// value first).
extern const ThreadPriorityToNiceValuePairForTest
kThreadPriorityToNiceValueMapForTest[7];
// Returns the nice value matching |priority| based on the platform-specific
// implementation of kThreadTypeToNiceValueMap.
int ThreadTypeToNiceValue(ThreadType thread_type);
// Returns whether SetCurrentThreadTypeForPlatform can set a thread as
// kRealtimeAudio.
bool CanSetThreadTypeToRealtimeAudio();
// Allows platform specific tweaks to the generic POSIX solution for
// SetCurrentThreadType(). Returns true if the platform-specific
// implementation handled this |thread_type| change, false if the generic
// implementation should instead proceed.
bool SetCurrentThreadTypeForPlatform(ThreadType thread_type,
MessagePumpType pump_type_hint);
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
// Current thread id is cached in thread local storage for performance reasons.
// In some rare cases it's important to invalidate that cache explicitly (e.g.
// after going through clone() syscall which does not call pthread_atfork()
// handlers).
// This can only be called when the process is single-threaded.
BASE_EXPORT void InvalidateTidCache();
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
// Returns the ThreadPrioirtyForTest matching |nice_value| based on the
// platform-specific implementation of kThreadPriorityToNiceValueMapForTest.
ThreadPriorityForTest NiceValueToThreadPriorityForTest(int nice_value);
std::optional<ThreadPriorityForTest>
GetCurrentThreadPriorityForPlatformForTest();
int GetCurrentThreadNiceValue();
} // namespace internal
} // namespace base
#endif // BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
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