| //===-- Linux futex related definitions -------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_SRC_THREADS_LINUX_FUTEX_H |
| #define LLVM_LIBC_SRC_THREADS_LINUX_FUTEX_H |
| |
| #include "src/__support/architectures.h" // Architecture macros |
| |
| namespace __llvm_libc { |
| |
| #if (defined(LLVM_LIBC_ARCH_AARCH64) || defined(LLVM_LIBC_ARCH_X86_64)) |
| // The futex data has to be exactly 4 bytes long. However, we use a uint type |
| // here as we do not want to use `uint32_t` type to match the public definitions |
| // of types which include a field for a futex word. With public definitions, we |
| // cannot include <stdint.h> so we stick to the `unsigned int` type for x86_64 |
| // and aarch64 |
| using FutexWordType = unsigned int; |
| static_assert(sizeof(FutexWordType) == 4, |
| "Unexpected size of unsigned int type."); |
| #else |
| #error "Futex word base type not defined for the target architecture." |
| #endif |
| |
| } // namespace __llvm_libc |
| |
| #endif // LLVM_LIBC_SRC_THREADS_LINUX_FUTEX_H |
