Add new Queue, QueueItem, Queuelist, SBQueue, SBQueueItem classes to represent

libdispatch aka Grand Central Dispatch (GCD) queues.  Still fleshing out the
documentation and testing of these but the overall API is settling down so it's
a good time to check it in.
<rdar://problem/15600370> 

llvm-svn: 197190

lldb/source/Target/QueueItem.cpp

@@ -0,0 +1,55 @@
+//===-- QueueItem.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/Target/Queue.h"
+#include "lldb/Target/QueueItem.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+QueueItem::QueueItem (QueueSP queue_sp) :
+    m_queue_wp (queue_sp),
+    m_kind (eQueueItemKindUnknown),
+    m_address ()
+{
+}
+
+QueueItem::~QueueItem ()
+{
+}
+
+QueueItemKind
+QueueItem::GetKind() const
+{
+    return m_kind;
+}
+
+void
+QueueItem::SetKind (QueueItemKind item_kind)
+{
+    m_kind = item_kind;
+}
+
+Address &
+QueueItem::GetAddress () 
+{
+    return m_address;
+}
+
+void
+QueueItem::SetAddress (Address addr)
+{
+    m_address = addr;
+}
+
+ThreadSP
+QueueItem::GetExtendedBacktraceThread (ConstString type)
+{
+    return ThreadSP();
+}