lldb/source/Host/common/ThreadLauncher.cpp

//===-- ThreadLauncher.cpp ---------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// lldb Includes
#include "lldb/Core/Log.h"
#include "lldb/Host/HostNativeThread.h"
#include "lldb/Host/HostThread.h"
#include "lldb/Host/ThisThread.h"
#include "lldb/Host/ThreadLauncher.h"

#if defined(_WIN32)
#include "lldb/Host/windows/windows.h"
#endif

using namespace lldb;
using namespace lldb_private;

HostThread
ThreadLauncher::LaunchThread(llvm::StringRef name, lldb::thread_func_t thread_function, lldb::thread_arg_t thread_arg, Error *error_ptr, size_t min_stack_byte_size)
{
    Error error;
    if (error_ptr)
        error_ptr->Clear();

    // 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::thread_t)(-1L))
        error.SetError(::GetLastError(), eErrorTypeWin32);
#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 = NULL;
    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);

    error.SetError(err, eErrorTypePOSIX);
#endif
    if (error_ptr)
        *error_ptr = error;
    if (!error.Success())
        thread = LLDB_INVALID_HOST_THREAD;

    return HostThread(thread);
}