Non-stop linux native.

* linux-nat.c (linux_test_for_tracefork): Block events while we're
	here.
	(get_pending_status): Implement non-stop mode.
	(linux_nat_detach): Stop threads before detaching.
	(linux_nat_resume): In non-stop mode, always resume only a single
	PTID.
	(linux_handle_extended_wait): On a clone event, in non-stop mode,
	add new lwp to GDB's thread table, and mark as running, executing
	and stopped appropriately.
	(linux_nat_filter_event): Don't assume there are other running
	threads when a thread exits.
	(linux_nat_wait): Mark the main thread as running and executing.
	In non-stop mode, don't stop all lwps.
	(linux_nat_kill): Stop lwps before killing them.
	(linux_nat_thread_alive): Use signal 0 to detect if a thread is
	alive.
	(send_sigint_callback): New.
	(linux_nat_stop): New.
	(linux_nat_add_target): Set to_stop to linux_nat_stop.

	* linux-nat.h (thread_db_attach_lwp): Declare.

	* linux-thread-db.c (thread_get_info_callback): Check for new
	threads if we have none.
	(thread_from_lwp, enable_thread_event): Set proc_handle.pid to the
	stopped lwp.  Check for new threads if we have none.
	(thread_db_attach_lwp): New.
	(thread_db_init): Set proc_handle.pid to inferior_ptid.
	(check_event): Set proc_handle.pid to the stopped lwp.
	(thread_db_find_new_threads): Set proc_handle.pid to any stopped
	lwp available, bail out if there is none.

	* linux-fork.c (linux_fork_killall): Use SIGKILL instead of
	PTRACE_KILL.

gdb/linux-thread-db.c

@@ -283,7 +283,10 @@ thread_get_info_callback (const td_thrhandle_t *thp, void *infop)
   if (thread_info == NULL)
     {
       /* New thread.  Attach to it now (why wait?).  */
-      attach_thread (thread_ptid, thp, &ti);
+      if (!have_threads ())
+	thread_db_find_new_threads ();
+      else
+	attach_thread (thread_ptid, thp, &ti);
       thread_info = find_thread_pid (thread_ptid);
       gdb_assert (thread_info != NULL);
     }
@@ -308,6 +311,8 @@ thread_from_lwp (ptid_t ptid)
      LWP.  */
   gdb_assert (GET_LWP (ptid) != 0);
 
+  /* Access an lwp we know is stopped.  */
+  proc_handle.pid = GET_LWP (ptid);
   err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th);
   if (err != TD_OK)
     error (_("Cannot find user-level thread for LWP %ld: %s"),
@@ -332,6 +337,48 @@ thread_from_lwp (ptid_t ptid)
 }
 
 
+/* Attach to lwp PTID, doing whatever else is required to have this
+   LWP under the debugger's control --- e.g., enabling event
+   reporting.  Returns true on success.  */
+int
+thread_db_attach_lwp (ptid_t ptid)
+{
+  td_thrhandle_t th;
+  td_thrinfo_t ti;
+  td_err_e err;
+
+  if (!using_thread_db)
+    return 0;
+
+  /* This ptid comes from linux-nat.c, which should always fill in the
+     LWP.  */
+  gdb_assert (GET_LWP (ptid) != 0);
+
+  /* Access an lwp we know is stopped.  */
+  proc_handle.pid = GET_LWP (ptid);
+
+  /* If we have only looked at the first thread before libpthread was
+     initialized, we may not know its thread ID yet.  Make sure we do
+     before we add another thread to the list.  */
+  if (!have_threads ())
+    thread_db_find_new_threads ();
+
+  err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th);
+  if (err != TD_OK)
+    /* Cannot find user-level thread.  */
+    return 0;
+
+  err = td_thr_get_info_p (&th, &ti);
+  if (err != TD_OK)
+    {
+      warning (_("Cannot get thread info: %s"), thread_db_err_str (err));
+      return 0;
+    }
+
+  attach_thread (ptid, &th, &ti);
+  return 1;
+}
+
 void
 thread_db_init (struct target_ops *target)
 {
@@ -418,6 +465,9 @@ enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp)
   td_notify_t notify;
   td_err_e err;
 
+  /* Access an lwp we know is stopped.  */
+  proc_handle.pid = GET_LWP (inferior_ptid);
+
   /* Get the breakpoint address for thread EVENT.  */
   err = td_ta_event_addr_p (thread_agent, event, &notify);
   if (err != TD_OK)
@@ -761,6 +811,15 @@ check_event (ptid_t ptid)
   if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr)
     return;
 
+  /* Access an lwp we know is stopped.  */
+  proc_handle.pid = GET_LWP (ptid);
+
+  /* If we have only looked at the first thread before libpthread was
+     initialized, we may not know its thread ID yet.  Make sure we do
+     before we add another thread to the list.  */
+  if (!have_threads ())
+    thread_db_find_new_threads ();
+
   /* If we are at a create breakpoint, we do not know what new lwp
      was created and cannot specifically locate the event message for it.
      We have to call td_ta_event_getmsg() to get
@@ -951,11 +1010,27 @@ find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
   return 0;
 }
 
+/* Search for new threads, accessing memory through stopped thread
+   PTID.  */
+
 static void
 thread_db_find_new_threads (void)
 {
   td_err_e err;
+  struct lwp_info *lp;
+  ptid_t ptid;
 
+  /* In linux, we can only read memory through a stopped lwp.  */
+  ALL_LWPS (lp, ptid)
+    if (lp->stopped)
+      break;
+
+  if (!lp)
+    /* There is no stopped thread.  Bail out.  */
+    return;
+
+  /* Access an lwp we know is stopped.  */
+  proc_handle.pid = GET_LWP (ptid);
   /* Iterate over all user-space threads to discover new threads.  */
   err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL,
 			  TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,