* infrun.c (normal_stop): Use has_stack_frames instead of

	target_has_stack.
	* mi/mi-main.c (mi_execute_command): Avoid calling inferior_thread
	when there is no thread selected.
	(mi_cmd_execute): Don't special case commands that can run without
	a valid selected thread.
	* top.c (execute_command): Don't special case commands that can
	run without a valid selected thread.  Use has_stack_frames.
	* infcmd.c (ensure_valid_thread): New.
	(continue_1, step_1, jump_command, signal_command): Use it.
	(detach_command): Error out if there's no selected thread/inferior.
	* thread.c (print_thread_info): Allow having no thread selected.
	(switch_to_thread): Don't read the PC if there is no current thread.
	(do_restore_current_thread_cleanup): Don't record the current
	frame if there is no current thread.
	(make_cleanup_restore_current_thread): Don't read frame info if
	there is no selected thread.
	(_initialize_thread): Don't mark commands as
	"no_selected_thread_ok".
	* frame.c (get_current_frame): Error out if there is no valid
	selected thread.
	(has_stack_frames): Return false if there is no valid
	selected thread.
	* cli/cli-cmds.c (init_cli_cmds): Don't mark commands as
	"no_selected_thread_ok".
	* cli/cli-decode.c (set_cmd_no_selected_thread_ok)
	(get_cmd_no_selected_thread_ok): Delete.
	* cli/cli-decode.h (CMD_NO_SELECTED_THREAD_OK): Delete.
	(set_cmd_no_selected_thread_ok, get_cmd_no_selected_thread_ok):
	Delete declaration.
	* stack.c (get_selected_block): Use has_stack_frames.

1 files changed, 13 insertions, 2 deletions

diff --git a/gdb/frame.c b/gdb/frame.c
index 1d1856e..b0a99fb 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -980,6 +980,10 @@ get_current_frame (void)
     error (_("No stack."));
   if (!target_has_memory)
     error (_("No memory."));
+  if (ptid_equal (inferior_ptid, null_ptid))
+    error (_("No selected thread."));
+  if (is_exited (inferior_ptid))
+    error (_("Invalid selected thread."));
   if (is_executing (inferior_ptid))
     error (_("Target is executing."));
 
@@ -1009,8 +1013,15 @@ has_stack_frames (void)
   if (!target_has_registers || !target_has_stack || !target_has_memory)
     return 0;
 
-  /* If the current thread is executing, don't try to read from
-     it.  */
+  /* No current inferior, no frame.  */
+  if (ptid_equal (inferior_ptid, null_ptid))
+    return 0;
+
+  /* Don't try to read from a dead thread.  */
+  if (is_exited (inferior_ptid))
+    return 0;
+
+  /* ... or from a spinning thread.  */
   if (is_executing (inferior_ptid))
     return 0;