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1//===-- Linux futex related definitions -------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_LIBC_SRC_THREADS_LINUX_FUTEX_H10#define LLVM_LIBC_SRC_THREADS_LINUX_FUTEX_H11 12#include "src/__support/macros/config.h"13#include "src/__support/macros/properties/architectures.h" // Architecture macros14 15namespace LIBC_NAMESPACE_DECL {16 17#if (defined(LIBC_TARGET_ARCH_IS_AARCH64) || \18 defined(LIBC_TARGET_ARCH_IS_X86_64))19// The futex data has to be exactly 4 bytes long. However, we use a uint type20// here as we do not want to use `uint32_t` type to match the public definitions21// of types which include a field for a futex word. With public definitions, we22// cannot include <stdint.h> so we stick to the `unsigned int` type for x86_6423// and aarch6424using FutexWordType = unsigned int;25static_assert(sizeof(FutexWordType) == 4,26 "Unexpected size of unsigned int type.");27#else28#error "Futex word base type not defined for the target architecture."29#endif30 31} // namespace LIBC_NAMESPACE_DECL32 33#endif // LLVM_LIBC_SRC_THREADS_LINUX_FUTEX_H34