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 }
85