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RFA: Patch for corefile support

The attached patch fixes a problem in gdb when a corefile is read in
after a multithreaded application has been debugged.  What happens is that
the thread-db and lin-lwp layers are still around and run into internal

The solution is simply to unpush the thread-db ops in its mourn_inferior
routine.  If a corefile gets loaded, there is no thread-db to interfere.
If another multi-threaded app gets loaded, the thread_db_new_objfile is
designed to bring back the thread-db layer as needed.

This fix solves another failure in the killed.exp testsuite as well.

Ok to commit?

-- Jeff J.
Index: thread-db.c
RCS file: /cvs/src/src/gdb/thread-db.c,v
retrieving revision 1.28
diff -u -r1.28 thread-db.c
--- thread-db.c	14 Jan 2003 00:49:04 -0000	1.28
+++ thread-db.c	27 Jan 2003 22:58:58 -0000
@@ -1007,6 +1007,11 @@ = 0;
   target_beneath->to_mourn_inferior ();
+  /* Detach thread_db target ops.  The thread_db_new_objfile routine
+     will reattach them later if needed.  */
+  unpush_target (&thread_db_ops);
+  using_thread_db = 0;
 static int

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