lldb/source/Host/common/ThreadLauncher.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-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>
  25 ThreadLauncher::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 is
  29   // successful.
  30   auto info_up = std::make_unique<HostThreadCreateInfo>(name.str(), impl);
  31   lldb::thread_t thread;
  32 #ifdef _WIN32
  33   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 #else
  39
  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 #endif
  47
  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 #endif
  76
  77   info_up.release();
  78   return HostThread(thread);
  79 }