contrib/llvm-project/lldb/source/Host/common/ThreadLauncher.cpp

   1 //===-- ThreadLauncher.cpp --------------------------------------*- 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 // lldb Includes
  10 #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 #endif
  18
  19 #include "llvm/Support/WindowsError.h"
  20
  21 using namespace lldb;
  22 using namespace lldb_private;
  23
  24 llvm::Expected<HostThread> ThreadLauncher::LaunchThread(
  25     llvm::StringRef name, lldb::thread_func_t thread_function,
  26     lldb::thread_arg_t thread_arg, size_t min_stack_byte_size) {
  27   // Host::ThreadCreateTrampoline will delete this pointer for us.
  28   HostThreadCreateInfo *info_ptr =
  29       new HostThreadCreateInfo(name.data(), thread_function, thread_arg);
  30   lldb::thread_t thread;
  31 #ifdef _WIN32
  32   thread = (lldb::thread_t)::_beginthreadex(
  33       0, (unsigned)min_stack_byte_size,
  34       HostNativeThread::ThreadCreateTrampoline, info_ptr, 0, NULL);
  35   if (thread == LLDB_INVALID_HOST_THREAD)
  36     return llvm::errorCodeToError(llvm::mapWindowsError(GetLastError()));
  37 #else
  38
  39 // ASAN instrumentation adds a lot of bookkeeping overhead on stack frames.
  40 #if __has_feature(address_sanitizer)
  41   const size_t eight_megabytes = 8 * 1024 * 1024;
  42   if (min_stack_byte_size < eight_megabytes) {
  43     min_stack_byte_size += eight_megabytes;
  44   }
  45 #endif
  46
  47   pthread_attr_t *thread_attr_ptr = nullptr;
  48   pthread_attr_t thread_attr;
  49   bool destroy_attr = false;
  50   if (min_stack_byte_size > 0) {
  51     if (::pthread_attr_init(&thread_attr) == 0) {
  52       destroy_attr = true;
  53       size_t default_min_stack_byte_size = 0;
  54       if (::pthread_attr_getstacksize(&thread_attr,
  55                                       &default_min_stack_byte_size) == 0) {
  56         if (default_min_stack_byte_size < min_stack_byte_size) {
  57           if (::pthread_attr_setstacksize(&thread_attr, min_stack_byte_size) ==
  58               0)
  59             thread_attr_ptr = &thread_attr;
  60         }
  61       }
  62     }
  63   }
  64   int err =
  65       ::pthread_create(&thread, thread_attr_ptr,
  66                        HostNativeThread::ThreadCreateTrampoline, info_ptr);
  67
  68   if (destroy_attr)
  69     ::pthread_attr_destroy(&thread_attr);
  70
  71   if (err)
  72     return llvm::errorCodeToError(
  73         std::error_code(err, std::generic_category()));
  74 #endif
  75
  76   return HostThread(thread);
  77 }