LLDB  mainline
ThreadLauncher.cpp
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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
12 #include "lldb/Host/HostThread.h"
13 #include "lldb/Utility/Log.h"
14 
15 #if defined(_WIN32)
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 }
lldb_private::HostThread
Definition: HostThread.h:29
ThreadLauncher.h
HostThread.h
lldb::thread_t
pthread_t thread_t
Definition: lldb-types.h:58
Log.h
lldb::thread_result_t
void * thread_result_t
Definition: lldb-types.h:62
windows.h
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
HostNativeThread.h
lldb
Definition: SBAddress.h:15
LLDB_INVALID_HOST_THREAD
#define LLDB_INVALID_HOST_THREAD
Definition: lldb-types.h:79