LLDB  mainline
ThreadLauncher.cpp
Go to the documentation of this file.
1 //===-- ThreadLauncher.cpp ---------------------------------------*- C++
2 //-*-===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // lldb Includes
13 #include "lldb/Host/HostThread.h"
14 #include "lldb/Utility/Log.h"
15 
16 #if defined(_WIN32)
18 #endif
19 
20 using namespace lldb;
21 using namespace lldb_private;
22 
23 HostThread ThreadLauncher::LaunchThread(llvm::StringRef name,
24  lldb::thread_func_t thread_function,
25  lldb::thread_arg_t thread_arg,
26  Status *error_ptr,
27  size_t min_stack_byte_size) {
28  Status error;
29  if (error_ptr)
30  error_ptr->Clear();
31 
32  // Host::ThreadCreateTrampoline will delete this pointer for us.
33  HostThreadCreateInfo *info_ptr =
34  new HostThreadCreateInfo(name.data(), thread_function, thread_arg);
35  lldb::thread_t thread;
36 #ifdef _WIN32
37  thread = (lldb::thread_t)::_beginthreadex(
38  0, (unsigned)min_stack_byte_size,
39  HostNativeThread::ThreadCreateTrampoline, info_ptr, 0, NULL);
40  if (thread == (lldb::thread_t)(-1L))
41  error.SetError(::GetLastError(), eErrorTypeWin32);
42 #else
43 
44 // ASAN instrumentation adds a lot of bookkeeping overhead on stack frames.
45 #if __has_feature(address_sanitizer)
46  const size_t eight_megabytes = 8 * 1024 * 1024;
47  if (min_stack_byte_size < eight_megabytes) {
48  min_stack_byte_size += eight_megabytes;
49  }
50 #endif
51 
52  pthread_attr_t *thread_attr_ptr = NULL;
53  pthread_attr_t thread_attr;
54  bool destroy_attr = false;
55  if (min_stack_byte_size > 0) {
56  if (::pthread_attr_init(&thread_attr) == 0) {
57  destroy_attr = true;
58  size_t default_min_stack_byte_size = 0;
59  if (::pthread_attr_getstacksize(&thread_attr,
60  &default_min_stack_byte_size) == 0) {
61  if (default_min_stack_byte_size < min_stack_byte_size) {
62  if (::pthread_attr_setstacksize(&thread_attr, min_stack_byte_size) ==
63  0)
64  thread_attr_ptr = &thread_attr;
65  }
66  }
67  }
68  }
69  int err =
70  ::pthread_create(&thread, thread_attr_ptr,
71  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 }
void * thread_arg_t
Definition: lldb-types.h:61
Enumerations for broadcasting.
Definition: SBLaunchInfo.h:14
POSIX error codes.
Standard Win32 error codes.
void *(* thread_func_t)(void *)
Definition: lldb-types.h:63
void Clear()
Clear the object state.
Definition: Status.cpp:167
bool Success() const
Test for success condition.
Definition: Status.cpp:287
pthread_t thread_t
Definition: lldb-types.h:58
int void SetError(ValueType err, lldb::ErrorType type)
Set accesssor with an error value and type.
Definition: Status.cpp:216
Definition: SBAddress.h:15
#define LLDB_INVALID_HOST_THREAD
Definition: lldb-types.h:79
An error handling class.
Definition: Status.h:44