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//===-- ThreadLauncher.cpp --------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
// lldb Includes
#include "lldb/Host/ThreadLauncher.h"
#include "lldb/Host/HostNativeThread.h"
#include "lldb/Host/HostThread.h"
#include "lldb/Utility/Log.h"
#if defined(_WIN32)
#include "lldb/Host/windows/windows.h"
#endif
#include "llvm/Support/WindowsError.h"
using namespace lldb;
using namespace lldb_private;
llvm::Expected<HostThread> ThreadLauncher::LaunchThread(
llvm::StringRef name, lldb::thread_func_t thread_function,
lldb::thread_arg_t thread_arg, size_t min_stack_byte_size) {
// Host::ThreadCreateTrampoline will delete this pointer for us.
HostThreadCreateInfo *info_ptr =
new HostThreadCreateInfo(name.data(), thread_function, thread_arg);
lldb::thread_t thread;
#ifdef _WIN32
thread = (lldb::thread_t)::_beginthreadex(
0, (unsigned)min_stack_byte_size,
HostNativeThread::ThreadCreateTrampoline, info_ptr, 0, NULL);
if (thread == LLDB_INVALID_HOST_THREAD)
return llvm::errorCodeToError(llvm::mapWindowsError(GetLastError()));
#else
// ASAN instrumentation adds a lot of bookkeeping overhead on stack frames.
#if __has_feature(address_sanitizer)
const size_t eight_megabytes = 8 * 1024 * 1024;
if (min_stack_byte_size < eight_megabytes) {
min_stack_byte_size += eight_megabytes;
}
#endif
pthread_attr_t *thread_attr_ptr = nullptr;
pthread_attr_t thread_attr;
bool destroy_attr = false;
if (min_stack_byte_size > 0) {
if (::pthread_attr_init(&thread_attr) == 0) {
destroy_attr = true;
size_t default_min_stack_byte_size = 0;
if (::pthread_attr_getstacksize(&thread_attr,
&default_min_stack_byte_size) == 0) {
if (default_min_stack_byte_size < min_stack_byte_size) {
if (::pthread_attr_setstacksize(&thread_attr, min_stack_byte_size) ==
0)
thread_attr_ptr = &thread_attr;
}
}
}
}
int err =
::pthread_create(&thread, thread_attr_ptr,
HostNativeThread::ThreadCreateTrampoline, info_ptr);
if (destroy_attr)
::pthread_attr_destroy(&thread_attr);
if (err)
return llvm::errorCodeToError(
std::error_code(err, std::generic_category()));
#endif
return HostThread(thread);
}
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