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diff --git a/gdb/common/ptid.h b/gdb/common/ptid.h
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+/* The ptid_t type and common functions operating on it.
+
+   Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
+   1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+   2009, 2010, 2011 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 PTID_H
+#define PTID_H
+
+/* The ptid struct is a collection of the various "ids" necessary
+   for identifying the inferior.  This consists of the process id
+   (pid), thread id (tid), and other fields necessary for uniquely
+   identifying the inferior process/thread being debugged.  When
+   manipulating ptids, the constructors, accessors, and predicate
+   declared in server.h should be used.  These are as follows:
+
+      ptid_build	- Make a new ptid from a pid, lwp, and tid.
+      pid_to_ptid	- Make a new ptid from just a pid.
+      ptid_get_pid	- Fetch the pid component of a ptid.
+      ptid_get_lwp	- Fetch the lwp component of a ptid.
+      ptid_get_tid	- Fetch the tid component of a ptid.
+      ptid_equal	- Test to see if two ptids are equal.
+
+   Please do NOT access the struct ptid members directly (except, of
+   course, in the implementation of the above ptid manipulation
+   functions).  */
+
+struct ptid
+  {
+    /* Process id */
+    int pid;
+
+    /* Lightweight process id */
+    long lwp;
+
+    /* Thread id */
+    long tid;
+  };
+
+typedef struct ptid ptid_t;
+
+/* The null or zero ptid, often used to indicate no process. */
+extern ptid_t null_ptid;
+
+/* The -1 ptid, often used to indicate either an error condition
+   or a "don't care" condition, i.e, "run all threads."  */
+extern ptid_t minus_one_ptid;
+
+/* Attempt to find and return an existing ptid with the given PID, LWP,
+   and TID components.  If none exists, create a new one and return
+   that.  */
+ptid_t ptid_build (int pid, long lwp, long tid);
+
+/* Find/Create a ptid from just a pid. */
+ptid_t pid_to_ptid (int pid);
+
+/* Fetch the pid (process id) component from a ptid. */
+int ptid_get_pid (ptid_t ptid);
+
+/* Fetch the lwp (lightweight process) component from a ptid. */
+long ptid_get_lwp (ptid_t ptid);
+
+/* Fetch the tid (thread id) component from a ptid. */
+long ptid_get_tid (ptid_t ptid);
+
+/* Compare two ptids to see if they are equal */
+int ptid_equal (ptid_t p1, ptid_t p2);
+
+/* Return true if PTID represents a process id.  */
+int ptid_is_pid (ptid_t ptid);
+
+#endif