1 files changed, 79 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Host/common/ThreadLauncher.cpp b/contrib/llvm-project/lldb/source/Host/common/ThreadLauncher.cpp
new file mode 100644
index 000000000000..28c90215f874
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Host/common/ThreadLauncher.cpp
@@ -0,0 +1,79 @@
+//===-- ThreadLauncher.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// lldb Includes
+#include "lldb/Host/ThreadLauncher.h"
+#include "lldb/Host/HostNativeThread.h"
+#include "lldb/Host/HostThread.h"
+#include "lldb/Utility/Log.h"
+
+#if defined(_WIN32)
+#include "lldb/Host/windows/windows.h"
+#endif
+
+#include "llvm/Support/WindowsError.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+llvm::Expected<HostThread>
+ThreadLauncher::LaunchThread(llvm::StringRef name,
+                             std::function<thread_result_t()> impl,
+                             size_t min_stack_byte_size) {
+  // Host::ThreadCreateTrampoline will take ownership if thread creation is
+  // successful.
+  auto info_up = std::make_unique<HostThreadCreateInfo>(name.str(), impl);
+  lldb::thread_t thread;
+#ifdef _WIN32
+  thread = (lldb::thread_t)::_beginthreadex(
+      0, (unsigned)min_stack_byte_size,
+      HostNativeThread::ThreadCreateTrampoline, info_up.get(), 0, NULL);
+  if (thread == LLDB_INVALID_HOST_THREAD)
+    return llvm::errorCodeToError(llvm::mapWindowsError(GetLastError()));
+#else
+
+// ASAN instrumentation adds a lot of bookkeeping overhead on stack frames.
+#if __has_feature(address_sanitizer)
+  const size_t eight_megabytes = 8 * 1024 * 1024;
+  if (min_stack_byte_size < eight_megabytes) {
+    min_stack_byte_size += eight_megabytes;
+  }
+#endif
+
+  pthread_attr_t *thread_attr_ptr = nullptr;
+  pthread_attr_t thread_attr;
+  bool destroy_attr = false;
+  if (min_stack_byte_size > 0) {
+    if (::pthread_attr_init(&thread_attr) == 0) {
+      destroy_attr = true;
+      size_t default_min_stack_byte_size = 0;
+      if (::pthread_attr_getstacksize(&thread_attr,
+                                      &default_min_stack_byte_size) == 0) {
+        if (default_min_stack_byte_size < min_stack_byte_size) {
+          if (::pthread_attr_setstacksize(&thread_attr, min_stack_byte_size) ==
+              0)
+            thread_attr_ptr = &thread_attr;
+        }
+      }
+    }
+  }
+  int err =
+      ::pthread_create(&thread, thread_attr_ptr,
+                       HostNativeThread::ThreadCreateTrampoline, info_up.get());
+
+  if (destroy_attr)
+    ::pthread_attr_destroy(&thread_attr);
+
+  if (err)
+    return llvm::errorCodeToError(
+        std::error_code(err, std::generic_category()));
+#endif
+
+  info_up.release();
+  return HostThread(thread);
+}