GDBserver disconnected tracing support.

	* linux-low.c (linux_remove_process): Delete.
	(add_lwp): Don't set last_resume_kind here.
	(linux_kill): Use `mourn'.
	(linux_detach): Use `thread_db_detach', and `mourn'.
	(linux_mourn): New.
	(linux_attach_lwp_1): Adjust comment.
	(linux_attach): last_resume_kind moved the thread_info; adjust.
	(status_pending_p_callback): Adjust.
	(linux_wait_for_event_1): Adjust.
	(count_events_callback, select_singlestep_lwp_callback)
	(select_event_lwp_callback, cancel_breakpoints_callback)
	(db_wants_lwp_stopped, linux_wait_1, need_step_over_p)
	(proceed_one_lwp): Adjust.
	(linux_async): Add debug output.
	(linux_thread_stopped): New.
	(linux_pause_all): New.
	(linux_target_ops): Install linux_mourn, linux_thread_stopped and
	linux_pause_all.
	* linux-low.h (struct lwp_info): Delete last_resume_kind field.
	(thread_db_free): Delete declaration.
	(thread_db_detach, thread_db_mourn): Declare.
	* thread-db.c (thread_db_init): Use thread_db_mourn.
	(thread_db_free): Delete, split in two.
	(disable_thread_event_reporting): New.
	(thread_db_detach): New.
	(thread_db_mourn): New.

	* server.h (struct thread_info) <last_resume_kind>: New field.
	<attached>: Add comment.
	<gdb_detached>: New field.
	(handler_func): Change return type to int.
	(handle_serial_event, handle_target_event): Ditto.
	(gdb_connected): Declare.
	(tracing): Delete.
	(disconnected_tracing): Declare.
	(stop_tracing): Declare.

	* server.c (handle_query) <qSupported>: Report support for
	disconnected tracing.
	(queue_stop_reply_callback): Account for running threads.
	(gdb_wants_thread_stopped): New.
	(gdb_wants_all_threads_stopped): New.
	(gdb_reattached_process): New.
	(handle_status): Clear the `gdb_detached' flag of all processes.
	In all-stop, stop all threads.
	(main): Be sure to leave tfind mode.  Handle disconnected tracing.
	(process_serial_event): If the remote connection breaks, or if an
	exit was forced with "monitor exit", force an event loop exit.
	Handle disconnected tracing on detach.
	(handle_serial_event): Adjust.
	(handle_target_event): If GDB isn't connected, forward events back
	to the inferior, unless the last process exited, in which case,
	exit gdbserver.  Adjust interface.

	* remote-utils.c (remote_open): Don't block in accept.  Instead
	register an event loop source on the listen socket file
	descriptor.  Refactor bits into ...
	(listen_desc): ... this new global.
	(gdb_connected): ... this new function.
	(enable_async_notification): ... this new function.
	(handle_accept_event): ... this new function.
	(remote_close): Clear remote_desc.

	* inferiors.c (add_thread): Set the new thread's last_resume_kind.

	* target.h (struct target_ops) <mourn, thread_stopped, pause_all>:
	New fields.
	(mourn_inferior): Define.
	(target_process_qsupported): Avoid the dangling else problem.
	(thread_stopped): Define.
	(pause_all): Define.
	(target_waitstatus_to_string): Declare.
	* target.c (target_waitstatus_to_string): New.

	* tracepoint.c (tracing): Make extern.
	(disconnected_tracing): New.
	(stop_tracing): Make extern.  Handle tracing stops due to GDB
	disconnecting.
	(cmd_qtdisconnected): New.
	(cmd_qtstatus): Report disconnected tracing status in trace reply.
	(handle_tracepoint_general_set): Handle QTDisconnected.

	* event-loop.c (event_handler_func): Change return type to int.
	(process_event): Bail out if the event handler wants the event
	loop to stop.
	(handle_file_event): Ditto.
	(start_event_loop): Bail out if the event handler wants the event
	loop to stop.

	* nto-low.c (nto_target_ops): Adjust.
	* spu-low.c (spu_wait): Don't remove the process here.
	(spu_target_ops): Adjust.
	* win32-low.c (win32_wait): Don't remove the process here.
	(win32_target_ops): Adjust.

1 files changed, 38 insertions, 16 deletions

diff --git a/gdb/gdbserver/thread-db.c b/gdb/gdbserver/thread-db.c
index 55f953d..8e7d7a9 100644
--- a/gdb/gdbserver/thread-db.c
+++ b/gdb/gdbserver/thread-db.c
@@ -743,7 +743,7 @@ thread_db_init (int use_events)
       if (use_events && thread_db_enable_reporting () == 0)
 	{
 	  /* Keep trying; maybe event reporting will work later.  */
-	  thread_db_free (proc, 0);
+	  thread_db_mourn (proc);
 	  return 0;
 	}
       thread_db_find_new_threads ();
@@ -768,41 +768,64 @@ any_thread_of (struct inferior_list_entry *entry, void *args)
 
 /* Disconnect from libthread_db and free resources.  */
 
-void
-thread_db_free (struct process_info *proc, int detaching)
+static void
+disable_thread_event_reporting (struct process_info *proc)
 {
   struct thread_db *thread_db = proc->private->thread_db;
   if (thread_db)
     {
-      struct thread_info *saved_inferior;
-      int pid;
-      td_err_e (*td_ta_delete_p) (td_thragent_t *);
       td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta,
 				       td_thr_events_t *event);
 
 #ifndef USE_LIBTHREAD_DB_DIRECTLY
       td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event");
-      td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete");
 #else
-      td_ta_delete_p = &td_ta_delete;
       td_ta_clear_event_p = &td_ta_clear_event;
 #endif
 
-      pid = pid_of (proc);
-      saved_inferior = current_inferior;
-      current_inferior =
-	(struct thread_info *) find_inferior (&all_threads,
-					      any_thread_of, &pid);
-
-      if (detaching && td_ta_clear_event_p != NULL)
+      if (td_ta_clear_event_p != NULL)
 	{
+	  struct thread_info *saved_inferior;
 	  td_thr_events_t events;
+	  int pid;
+
+	  pid = pid_of (proc);
+	  saved_inferior = current_inferior;
+	  current_inferior =
+	    (struct thread_info *) find_inferior (&all_threads,
+						  any_thread_of, &pid);
 
 	  /* Set the process wide mask saying we aren't interested
 	     in any events anymore.  */
 	  td_event_fillset (&events);
 	  (*td_ta_clear_event_p) (thread_db->thread_agent, &events);
+
+	  current_inferior = saved_inferior;
 	}
+    }
+}
+
+void
+thread_db_detach (struct process_info *proc)
+{
+  disable_thread_event_reporting (proc);
+}
+
+/* Disconnect from libthread_db and free resources.  */
+
+void
+thread_db_mourn (struct process_info *proc)
+{
+  struct thread_db *thread_db = proc->private->thread_db;
+  if (thread_db)
+    {
+      td_err_e (*td_ta_delete_p) (td_thragent_t *);
+
+#ifndef USE_LIBTHREAD_DB_DIRECTLY
+      td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete");
+#else
+      td_ta_delete_p = &td_ta_delete;
+#endif
 
       if (td_ta_delete_p != NULL)
 	(*td_ta_delete_p) (thread_db->thread_agent);
@@ -813,7 +836,6 @@ thread_db_free (struct process_info *proc, int detaching)
 
       free (thread_db);
       proc->private->thread_db = NULL;
-      current_inferior = saved_inferior;
     }
 }