1 //===--- Definition of a type for a futex word ------------------*- 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_SRC___SUPPORT_THREADS_LINUX_FUTEX_WORD_H 10 #define LLVM_LIBC_SRC___SUPPORT_THREADS_LINUX_FUTEX_WORD_H 11 12 #include "src/__support/macros/config.h" 13 #include <stdint.h> 14 #include <sys/syscall.h> 15 namespace LIBC_NAMESPACE_DECL { 16 17 // Futexes are 32 bits in size on all platforms, including 64-bit platforms. 18 using FutexWordType = uint32_t; 19 20 #if SYS_futex 21 constexpr auto FUTEX_SYSCALL_ID = SYS_futex; 22 #elif defined(SYS_futex_time64) 23 constexpr auto FUTEX_SYSCALL_ID = SYS_futex_time64; 24 #else 25 #error "futex and futex_time64 syscalls not available." 26 #endif 27 28 } // namespace LIBC_NAMESPACE_DECL 29 30 #endif // LLVM_LIBC_SRC___SUPPORT_THREADS_LINUX_FUTEX_WORD_H 31