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> 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 }
lldb::thread_func_t
void *(* thread_func_t)(void *)
Definition: lldb-types.h:63
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_arg_t
void * thread_arg_t
Definition: lldb-types.h:61
lldb_private::ThreadLauncher::HostThreadCreateInfo
Definition: ThreadLauncher.h:30
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