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diff --git a/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.h b/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.h
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+++ b/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.h
@@ -0,0 +1,113 @@
+//===-- AppleGetThreadItemInfoHandler.h ----------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef lldb_AppleGetThreadItemInfoHandler_h_
+#define lldb_AppleGetThreadItemInfoHandler_h_
+
+// C Includes
+// C++ Includes
+#include <map>
+#include <vector>
+// Other libraries and framework includes
+// Project includes
+#include "lldb/lldb-public.h"
+#include "lldb/Core/Error.h"
+#include "lldb/Host/Mutex.h"
+#include "lldb/Symbol/CompilerType.h"
+
+// This class will insert a UtilityFunction into the inferior process for
+// calling libBacktraceRecording's __introspection_dispatch_thread_get_item_info()
+// function.  The function in the inferior will return a struct by value
+// with these members:
+//
+//     struct get_thread_item_info_return_values
+//     {
+//         introspection_dispatch_item_info_ref *item_buffer;
+//         uint64_t item_buffer_size;
+//     };
+//
+// The item_buffer pointer is an address in the inferior program's address
+// space (item_buffer_size in size) which must be mach_vm_deallocate'd by
+// lldb.  
+//
+// The AppleGetThreadItemInfoHandler object should persist so that the UtilityFunction
+// can be reused multiple times.
+
+namespace lldb_private
+{
+
+class AppleGetThreadItemInfoHandler {
+public:
+
+    AppleGetThreadItemInfoHandler (lldb_private::Process *process);
+
+    ~AppleGetThreadItemInfoHandler();
+
+    struct GetThreadItemInfoReturnInfo
+    {
+        lldb::addr_t    item_buffer_ptr;  /* the address of the item buffer from libBacktraceRecording */
+        lldb::addr_t    item_buffer_size; /* the size of the item buffer from libBacktraceRecording */
+
+        GetThreadItemInfoReturnInfo() :
+            item_buffer_ptr(LLDB_INVALID_ADDRESS),
+            item_buffer_size(0)
+        {}
+    };
+
+    //----------------------------------------------------------
+    /// Get the information about a work item by calling
+    /// __introspection_dispatch_thread_get_item_info.  If there's a page of
+    /// memory that needs to be freed, pass in the address and size and it will
+    /// be freed before getting the list of queues.
+    ///
+    /// @param [in] thread_id
+    ///     The thread to get the extended backtrace for.
+    ///
+    /// @param [in] page_to_free
+    ///     An address of an inferior process vm page that needs to be deallocated,
+    ///     LLDB_INVALID_ADDRESS if this is not needed.
+    ///
+    /// @param [in] page_to_free_size
+    ///     The size of the vm page that needs to be deallocated if an address was
+    ///     passed in to page_to_free.
+    ///
+    /// @param [out] error
+    ///     This object will be updated with the error status / error string from any failures encountered.
+    ///
+    /// @returns
+    ///     The result of the inferior function call execution.  If there was a failure of any kind while getting
+    ///     the information, the item_buffer_ptr value will be LLDB_INVALID_ADDRESS.
+    //----------------------------------------------------------
+    GetThreadItemInfoReturnInfo
+    GetThreadItemInfo (Thread &thread, lldb::tid_t thread_id, lldb::addr_t page_to_free, uint64_t page_to_free_size, lldb_private::Error &error);
+
+
+    void
+    Detach ();
+
+private:
+
+    lldb::addr_t
+    SetupGetThreadItemInfoFunction (Thread &thread, ValueList &get_thread_item_info_arglist);
+
+    static const char *g_get_thread_item_info_function_name;
+    static const char *g_get_thread_item_info_function_code;
+
+    lldb_private::Process *m_process;
+    std::unique_ptr<UtilityFunction> m_get_thread_item_info_impl_code;
+    Mutex m_get_thread_item_info_function_mutex;
+
+    lldb::addr_t m_get_thread_item_info_return_buffer_addr;
+    Mutex m_get_thread_item_info_retbuffer_mutex;
+
+};
+
+}  // using namespace lldb_private
+
+#endif	// lldb_AppleGetThreadItemInfoHandler_h_