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third_party/llvm/libc/src/threads/linux/thread_utils.h
42 строки
2 KB
Constantine Tarasenkov
python3 utils/fetch_sources.py
04 сен 2021, 14:35
04 сен 2021, 14:35
4a0ab4c
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//===-- Linux specific definitions for threads implementations. --*- 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_THREAD_UTILS_H #define LLVM_LIBC_SRC_THREADS_LINUX_THREAD_UTILS_H #include "thread_start_args.h" #include <stdatomic.h> #include <stdint.h> namespace __llvm_libc { // The futex data has to be exactly 4 bytes long. However, we use a uint type // here as we do not want to use `_Atomic uint32_t` as the _Atomic keyword which // is C only. The header stdatomic.h does not define an atomic type // corresponding to `uint32_t` or to something which is exactly 4 bytes wide. using FutexData = atomic_uint; // We use a tri-state mutex because we want to avoid making syscalls // as much as possible. In `mtx_unlock` a syscall to wake waiting threads is // made only if the mutex status is `MutexStatus::Waiting`. enum MutexStatus : uint32_t { MS_Free, MS_Locked, MS_Waiting }; static_assert(sizeof(atomic_uint) == 4, "Size of the `atomic_uint` type is not 4 bytes on your platform. " "The implementation of the standard threads library for linux " "requires that size of `atomic_uint` be 4 bytes."); struct ThreadParams { static constexpr uintptr_t DefaultStackSize = 1 << 16; // 64 KB static constexpr uint32_t ClearTIDValue = 0xABCD1234; }; } // namespace __llvm_libc #endif // LLVM_LIBC_SRC_THREADS_LINUX_THREAD_UTILS_H