1 files changed, 70 insertions, 0 deletions
diff --git a/lldb/source/Host/macosx/objcxx/HostThreadMacOSX.mm b/lldb/source/Host/macosx/objcxx/HostThreadMacOSX.mm
new file mode 100644
index 00000000000..c5051cdf30d
--- /dev/null
+++ b/lldb/source/Host/macosx/objcxx/HostThreadMacOSX.mm
@@ -0,0 +1,70 @@
+//===-- HostThreadMacOSX.cpp ------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/macosx/HostThreadMacOSX.h"
+#include "lldb/Host/Host.h"
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <Foundation/Foundation.h>
+
+#include <pthread.h>
+
+using namespace lldb_private;
+
+namespace {
+
+pthread_once_t g_thread_create_once = PTHREAD_ONCE_INIT;
+pthread_key_t g_thread_create_key = 0;
+
+class MacOSXDarwinThread {
+public:
+  MacOSXDarwinThread() : m_pool(nil) {
+    m_pool = [[NSAutoreleasePool alloc] init];
+  }
+
+  ~MacOSXDarwinThread() {
+    if (m_pool) {
+      [m_pool drain];
+      m_pool = nil;
+    }
+  }
+
+  static void PThreadDestructor(void *v) {
+    if (v)
+      delete static_cast<MacOSXDarwinThread *>(v);
+    ::pthread_setspecific(g_thread_create_key, NULL);
+  }
+
+protected:
+  NSAutoreleasePool *m_pool;
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(MacOSXDarwinThread);
+};
+
+void InitThreadCreated() {
+  ::pthread_key_create(&g_thread_create_key,
+                       MacOSXDarwinThread::PThreadDestructor);
+}
+} // namespace
+
+HostThreadMacOSX::HostThreadMacOSX() : HostThreadPosix() {}
+
+HostThreadMacOSX::HostThreadMacOSX(lldb::thread_t thread)
+    : HostThreadPosix(thread) {}
+
+lldb::thread_result_t
+HostThreadMacOSX::ThreadCreateTrampoline(lldb::thread_arg_t arg) {
+  ::pthread_once(&g_thread_create_once, InitThreadCreated);
+  if (g_thread_create_key) {
+    ::pthread_setspecific(g_thread_create_key, new MacOSXDarwinThread());
+  }
+
+  return HostThreadPosix::ThreadCreateTrampoline(arg);
+}