deal thread id as unsigned

[Yoriko Komatsuzaki <yoriko@sm.sony.co.jp>]

Hello.

I would like to ask you to consider this tiny patch about thread id type.
Thread id is unsigned type in Linux.

Without this patch (especially about linux-thread-db.c), thread id
display can be minus...

# Apologies in advance if this is already-known issue.

Thank you.

--- gdb-6.6/gdb/defs.org.h	2007-04-10 16:04:51.000000000 +0900
+++ gdb-6.6/gdb/defs.h	2007-04-10 16:05:06.000000000 +0900
@@ -795,7 +795,7 @@ struct ptid
     long lwp;
 
     /* Thread id */
-    long tid;
+    unsigned long tid;
   };
 
 typedef struct ptid ptid_t;
--- gdb-6.6/gdb/linux-thread-db.org.c	2007-04-10 16:55:55.000000000 +0900
+++ gdb-6.6/gdb/linux-thread-db.c	2007-04-10 16:53:30.000000000 +0900
@@ -1031,10 +1031,10 @@ thread_db_pid_to_str (ptid_t ptid)
 
       thread_info = find_thread_pid (ptid);
       if (thread_info == NULL)
-	snprintf (buf, sizeof (buf), "Thread %ld (LWP %ld) (Missing)",
+	snprintf (buf, sizeof (buf), "Thread %lu (LWP %ld) (Missing)",
 		  GET_THREAD (ptid), GET_LWP (ptid));
       else
-	snprintf (buf, sizeof (buf), "Thread %ld (LWP %ld)",
+	snprintf (buf, sizeof (buf), "Thread %lu (LWP %ld)",
 		  GET_THREAD (ptid), GET_LWP (ptid));
 
       return buf;

---
Yoriko Komatsuzaki (yoriko@sm.sony.co.jp)