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diff --git a/gdb/thread-map.h b/gdb/thread-map.h
new file mode 100644
index 0000000000..2b41b7361c
--- /dev/null
+++ b/gdb/thread-map.h
@@ -0,0 +1,133 @@
+/* Thread map type for GDB, the GNU debugger.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef THREAD_MAP_H
+#define THREAD_MAP_H
+
+#include "defs.h"
+
+#include <unordered_map>
+
+struct thread_info;
+
+struct hash_ptid
+{
+  size_t operator() (const ptid_t &ptid) const
+  {
+    std::hash<long> long_hash;
+    return long_hash(ptid.pid()) + long_hash(ptid.lwp()) + long_hash(ptid.tid());
+  }
+};
+
+using ptid_thread_map = std::unordered_map<ptid_t, thread_info *, hash_ptid>;
+
+struct all_thread_map_range_iterator
+{
+  all_thread_map_range_iterator (ptid_thread_map::const_iterator iter)
+    : m_iter (iter)
+  {}
+
+  bool operator!= (const all_thread_map_range_iterator &other)
+  { return this->m_iter != other.m_iter; }
+
+  void operator++ ()
+  { this->m_iter++; }
+
+  thread_info *operator* ()
+  { return this->m_iter->second; }
+
+private:
+  typename ptid_thread_map::const_iterator m_iter;
+};
+
+struct all_thread_map_range
+{
+  all_thread_map_range (const ptid_thread_map &map)
+    : m_map (map)
+  {}
+
+  all_thread_map_range_iterator begin ()
+  {
+    return all_thread_map_range_iterator (this->m_map.begin ());
+  }
+
+  all_thread_map_range_iterator end ()
+  {
+    return all_thread_map_range_iterator (this->m_map.end ());
+  }
+
+private:
+  const ptid_thread_map &m_map;
+};
+
+struct non_exited_thread_map_range_iterator
+{
+  non_exited_thread_map_range_iterator (typename ptid_thread_map::const_iterator iter,
+					typename ptid_thread_map::const_iterator end)
+    : m_iter (iter), m_end (end)
+  {
+    advante_to_next_matching ();
+  }
+
+  bool operator!= (const non_exited_thread_map_range_iterator &other)
+  { return this->m_iter != other.m_iter; }
+
+  void operator++ ()
+  {
+    this->m_iter++;
+    advante_to_next_matching ();
+  }
+
+  thread_info *operator* ()
+  { return this->m_iter->second; }
+
+private:
+  typename ptid_thread_map::const_iterator m_iter;
+  typename ptid_thread_map::const_iterator m_end;
+
+  void advante_to_next_matching ()
+  {
+    while (this->m_iter != this->m_end
+	   && this->m_iter->second->state == THREAD_EXITED)
+      {
+	this->m_iter++;
+      }
+  }
+};
+
+struct non_exited_thread_map_range
+{
+  non_exited_thread_map_range (const ptid_thread_map &map)
+    : m_map (map)
+  {}
+
+  non_exited_thread_map_range_iterator begin()
+  {
+    return non_exited_thread_map_range_iterator (this->m_map.begin (), this->m_map.end ());
+  }
+
+  non_exited_thread_map_range_iterator end()
+  {
+    return non_exited_thread_map_range_iterator (this->m_map.end (), this->m_map.end ());
+  }
+
+private:
+  const ptid_thread_map &m_map;
+};
+
+#endif