linux native, switch forks, always have a thread

[Pedro Alves <pedro@codesourcery.com>]

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I'd missed this case when I made linux native always have a thread.

It's not perfect in the sense that switching forks ("restart"/"fork",
not follow-fork-mode) in multi-threaded apps doesn't handle
multi-threading correctly yet, but that is an already existing
problem.  We shall be getting back to that in a few weeks
for multi-process support.

-- 
Pedro Alves

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2008-04-30  Pedro Alves  <pedro@codesourcery.com>

	* linux-nat.c (linux_nat_switch_fork): Reinit GDB's thread list
	and register the fork's PTID as a thread.

---
 gdb/linux-nat.c |    2 ++
 1 file changed, 2 insertions(+)

Index: src/gdb/linux-nat.c
===================================================================
--- src.orig/gdb/linux-nat.c	2008-04-28 11:54:27.000000000 +0100
+++ src/gdb/linux-nat.c	2008-04-28 11:53:38.000000000 +0100
@@ -948,8 +948,10 @@ linux_nat_switch_fork (ptid_t new_ptid)
 {
   struct lwp_info *lp;
 
+  init_thread_list ();
   init_lwp_list ();
   lp = add_lwp (new_ptid);
+  add_thread_silent (new_ptid);
   lp->stopped = 1;
 }