[3/7] Adjust the bsd-uthread target

[Pedro Alves <pedro@codesourcery.com>]

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This patch adjusts the bsd-uthread target to use thread_change_ptid,
and to never let the core see an event happen in a thread not in
the thread table.

Tested on i386-unknown-freebsd6.0 with a little hack in the
testsuite to link the gdb.thread tests against -lc_r instead
of -lpthread, and on i386-unknown-openbsd4.3, where no hack is
needed.

This patch depends on patch 1 and 2.

OK?

-- 
Pedro Alves

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2008-08-08  Pedro Alves  <pedro@codesourcery.com>

	* bsd-uthread.c (bsd_uthread_wait): Decorate the main thread with
	thread_change_ptid.  Check for exited threads.
	(bsd_uthread_find_new_threads): Check for exited threads.

---
 gdb/bsd-uthread.c |   20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

Index: src/gdb/bsd-uthread.c
===================================================================
--- src.orig/gdb/bsd-uthread.c	2008-07-29 12:06:38.000000000 +0100
+++ src/gdb/bsd-uthread.c	2008-07-29 12:17:34.000000000 +0100
@@ -361,14 +361,16 @@ bsd_uthread_wait (ptid_t ptid, struct ta
 	}
     }
 
-  /* HACK: Twiddle INFERIOR_PTID such that the initial thread of a
-     process isn't recognized as a new thread.  */
-  if (ptid_get_tid (ptid) != 0 && !in_thread_list (ptid)
-      && ptid_get_tid (inferior_ptid) == 0)
-    {
-      add_thread_silent (ptid);
-      inferior_ptid = ptid;
-    }
+  /* If INFERIOR_PTID doesn't have a tid member yet, and we now have a
+     ptid with tid set, then ptid is still the initial thread of
+     the process.  Notify GDB core about it.  */
+  if (ptid_get_tid (inferior_ptid) == 0
+      && ptid_get_tid (ptid) != 0 && !in_thread_list (ptid))
+    thread_change_ptid (inferior_ptid, ptid);
+
+  /* Don't let the core see a ptid without a corresponding thread.  */
+  if (!in_thread_list (ptid) || is_exited (ptid))
+    add_thread (ptid);
 
   return ptid;
 }
@@ -413,7 +415,7 @@ bsd_uthread_find_new_threads (void)
     {
       ptid_t ptid = ptid_build (pid, 0, addr);
 
-      if (!in_thread_list (ptid))
+      if (!in_thread_list (ptid) || is_exited (ptid))
 	add_thread (ptid);
 
       addr = read_memory_typed_address (addr + offset,