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 <stdint.h> 13 #include <sys/syscall.h> 14 namespace LIBC_NAMESPACE { 15 16 // Futexes are 32 bits in size on all platforms, including 64-bit platforms. 17 using FutexWordType = uint32_t; 18 19 #if SYS_futex 20 constexpr auto FUTEX_SYSCALL_ID = SYS_futex; 21 #elif defined(SYS_futex_time64) 22 constexpr auto FUTEX_SYSCALL_ID = SYS_futex_time64; 23 #else 24 #error "futex and futex_time64 syscalls not available." 25 #endif 26 27 } // namespace LIBC_NAMESPACE 28 29 #endif // LLVM_LIBC_SRC___SUPPORT_THREADS_LINUX_FUTEX_WORD_H 30