contrib/llvm/tools/lldb/source/Host/common/ThreadLauncher.cpp

   1 //===-- ThreadLauncher.cpp ---------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // lldb Includes
  11 #include "lldb/Core/Log.h"
  12 #include "lldb/Host/HostNativeThread.h"
  13 #include "lldb/Host/HostThread.h"
  14 #include "lldb/Host/ThisThread.h"
  15 #include "lldb/Host/ThreadLauncher.h"
  16
  17 #if defined(_WIN32)
  18 #include "lldb/Host/windows/windows.h"
  19 #endif
  20
  21 using namespace lldb;
  22 using namespace lldb_private;
  23
  24 HostThread
  25 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)
  26 {
  27     Error error;
  28     if (error_ptr)
  29         error_ptr->Clear();
  30
  31     // Host::ThreadCreateTrampoline will delete this pointer for us.
  32     HostThreadCreateInfo *info_ptr = new HostThreadCreateInfo(name.data(), thread_function, thread_arg);
  33     lldb::thread_t thread;
  34 #ifdef _WIN32
  35     thread =
  36         (lldb::thread_t)::_beginthreadex(0, (unsigned)min_stack_byte_size, HostNativeThread::ThreadCreateTrampoline, info_ptr, 0, NULL);
  37     if (thread == (lldb::thread_t)(-1L))
  38         error.SetError(::GetLastError(), eErrorTypeWin32);
  39 #else
  40
  41
  42     // ASAN instrumentation adds a lot of bookkeeping overhead on stack frames.
  43 #if __has_feature(address_sanitizer)
  44     const size_t eight_megabytes = 8 * 1024 * 1024;
  45     if (min_stack_byte_size < eight_megabytes)
  46     {
  47         min_stack_byte_size += eight_megabytes;
  48     }
  49 #endif
  50
  51     pthread_attr_t *thread_attr_ptr = NULL;
  52     pthread_attr_t thread_attr;
  53     bool destroy_attr = false;
  54     if (min_stack_byte_size > 0)
  55     {
  56         if (::pthread_attr_init (&thread_attr) == 0)
  57         {
  58             destroy_attr = true;
  59             size_t default_min_stack_byte_size = 0;
  60             if (::pthread_attr_getstacksize(&thread_attr, &default_min_stack_byte_size) == 0)
  61             {
  62                 if (default_min_stack_byte_size < min_stack_byte_size)
  63                 {
  64                     if (::pthread_attr_setstacksize (&thread_attr, min_stack_byte_size) == 0)
  65                         thread_attr_ptr = &thread_attr;
  66                 }
  67             }
  68
  69         }
  70     }
  71     int err = ::pthread_create(&thread, thread_attr_ptr, HostNativeThread::ThreadCreateTrampoline, info_ptr);
  72
  73     if (destroy_attr)
  74         ::pthread_attr_destroy(&thread_attr);
  75
  76     error.SetError(err, eErrorTypePOSIX);
  77 #endif
  78     if (error_ptr)
  79         *error_ptr = error;
  80     if (!error.Success())
  81         thread = LLDB_INVALID_HOST_THREAD;
  82
  83     return HostThread(thread);
  84 }