80 lines · cpp
1//===-- ThreadLauncher.cpp ------------------------------------------------===//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// lldb Includes10#include "lldb/Host/ThreadLauncher.h"11#include "lldb/Host/HostNativeThread.h"12#include "lldb/Host/HostThread.h"13#include "lldb/Utility/Log.h"14 15#if defined(_WIN32)16#include "lldb/Host/windows/windows.h"17#endif18 19#include "llvm/Support/WindowsError.h"20 21using namespace lldb;22using namespace lldb_private;23 24llvm::Expected<HostThread>25ThreadLauncher::LaunchThread(llvm::StringRef name,26 std::function<thread_result_t()> impl,27 size_t min_stack_byte_size) {28 // Host::ThreadCreateTrampoline will take ownership if thread creation is29 // successful.30 auto info_up = std::make_unique<HostThreadCreateInfo>(name.str(), impl);31 lldb::thread_t thread;32#ifdef _WIN3233 thread = (lldb::thread_t)::_beginthreadex(34 0, (unsigned)min_stack_byte_size,35 HostNativeThread::ThreadCreateTrampoline, info_up.get(), 0, NULL);36 if (thread == LLDB_INVALID_HOST_THREAD)37 return llvm::errorCodeToError(llvm::mapWindowsError(GetLastError()));38#else39 40// ASAN instrumentation adds a lot of bookkeeping overhead on stack frames.41#if __has_feature(address_sanitizer)42 const size_t eight_megabytes = 8 * 1024 * 1024;43 if (min_stack_byte_size < eight_megabytes) {44 min_stack_byte_size += eight_megabytes;45 }46#endif47 48 pthread_attr_t *thread_attr_ptr = nullptr;49 pthread_attr_t thread_attr;50 bool destroy_attr = false;51 if (min_stack_byte_size > 0) {52 if (::pthread_attr_init(&thread_attr) == 0) {53 destroy_attr = true;54 size_t default_min_stack_byte_size = 0;55 if (::pthread_attr_getstacksize(&thread_attr,56 &default_min_stack_byte_size) == 0) {57 if (default_min_stack_byte_size < min_stack_byte_size) {58 if (::pthread_attr_setstacksize(&thread_attr, min_stack_byte_size) ==59 0)60 thread_attr_ptr = &thread_attr;61 }62 }63 }64 }65 int err =66 ::pthread_create(&thread, thread_attr_ptr,67 HostNativeThread::ThreadCreateTrampoline, info_up.get());68 69 if (destroy_attr)70 ::pthread_attr_destroy(&thread_attr);71 72 if (err)73 return llvm::errorCodeToError(74 std::error_code(err, std::generic_category()));75#endif76 77 info_up.release();78 return HostThread(thread);79}80