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54 lines
2.2 KiB
C++
54 lines
2.2 KiB
C++
// Copyright 2020 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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#ifndef BASE_CPU_AFFINITY_POSIX_H_
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#define BASE_CPU_AFFINITY_POSIX_H_
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#include "base/process/process_handle.h"
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#include "base/threading/platform_thread.h"
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#include "third_party/abseil-cpp/absl/types/optional.h"
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namespace base {
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enum class CpuAffinityMode {
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// No restrictions on affinity.
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kDefault,
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// Restrict execution to LITTLE cores only. Only has an effect on platforms
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// where we detect presence of big.LITTLE-like CPU architectures.
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kLittleCoresOnly,
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// Restrict execution to big cores only. Only has an effect on platforms
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// where we detect presence of big.LITTLE-like CPU architectures.
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kBigCoresOnly,
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// Restrict execution to bigger cores only. Only has an effect on platforms
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// where we detect presence of big.LITTLE-like CPU architectures. If there
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// are no bigger cores but there are big cores it will return an empty set.
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kBiggerCoresOnly,
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};
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// Sets or clears restrictions on the CPU affinity of the specified thread.
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// Returns false if updating the affinity failed.
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BASE_EXPORT bool SetThreadCpuAffinityMode(PlatformThreadId thread_id,
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CpuAffinityMode affinity);
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// Like SetThreadAffinityMode, but affects all current and future threads of
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// the given process. Note that this may not apply to threads that are created
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// in parallel to the execution of this function.
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BASE_EXPORT bool SetProcessCpuAffinityMode(ProcessHandle process_handle,
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CpuAffinityMode affinity);
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// Return true if the current architecture has big or bigger cores.
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BASE_EXPORT bool HasBigCpuCores();
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// Return true if the current architecture has bigger cores.
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BASE_EXPORT bool HasBiggerCpuCores();
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// For architectures with big cores, return the affinity mode that matches
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// the CPU affinity of the current thread. If no affinity mode exactly matches,
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// or if the architecture doesn't have different types of cores,
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// return nullopt.
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BASE_EXPORT absl::optional<CpuAffinityMode> CurrentThreadCpuAffinityMode();
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} // namespace base
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#endif // BASE_CPU_AFFINITY_POSIX_H_
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