1 /* Multi-process/thread control for GDB, the GNU debugger.
3 Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
5 Free Software Foundation, Inc.
7 Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
31 #include "gdbthread.h"
32 #include "exceptions.h"
37 #include "gdb_string.h"
40 #include <sys/types.h>
45 #include "cli/cli-decode.h"
46 #include "gdb_regex.h"
47 #include "cli/cli-utils.h"
48 #include "continuations.h"
50 /* Definition of struct thread_info exported to gdbthread.h. */
52 /* Prototypes for exported functions. */
54 void _initialize_thread (void);
56 /* Prototypes for local functions. */
58 static struct thread_info
*thread_list
= NULL
;
59 static int highest_thread_num
;
61 static void thread_command (char *tidstr
, int from_tty
);
62 static void thread_apply_all_command (char *, int);
63 static int thread_alive (struct thread_info
*);
64 static void info_threads_command (char *, int);
65 static void thread_apply_command (char *, int);
66 static void restore_current_thread (ptid_t
);
67 static void prune_threads (void);
69 /* Frontend view of the thread state. Possible extensions: stepping,
70 finishing, until(ling),... */
79 inferior_thread (void)
81 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
87 delete_step_resume_breakpoint (struct thread_info
*tp
)
89 if (tp
&& tp
->control
.step_resume_breakpoint
)
91 delete_breakpoint (tp
->control
.step_resume_breakpoint
);
92 tp
->control
.step_resume_breakpoint
= NULL
;
97 delete_exception_resume_breakpoint (struct thread_info
*tp
)
99 if (tp
&& tp
->control
.exception_resume_breakpoint
)
101 delete_breakpoint (tp
->control
.exception_resume_breakpoint
);
102 tp
->control
.exception_resume_breakpoint
= NULL
;
107 clear_thread_inferior_resources (struct thread_info
*tp
)
109 /* NOTE: this will take care of any left-over step_resume breakpoints,
110 but not any user-specified thread-specific breakpoints. We can not
111 delete the breakpoint straight-off, because the inferior might not
112 be stopped at the moment. */
113 if (tp
->control
.step_resume_breakpoint
)
115 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
116 tp
->control
.step_resume_breakpoint
= NULL
;
119 if (tp
->control
.exception_resume_breakpoint
)
121 tp
->control
.exception_resume_breakpoint
->disposition
122 = disp_del_at_next_stop
;
123 tp
->control
.exception_resume_breakpoint
= NULL
;
126 bpstat_clear (&tp
->control
.stop_bpstat
);
128 discard_all_intermediate_continuations_thread (tp
);
129 discard_all_continuations_thread (tp
);
131 delete_longjmp_breakpoint (tp
->num
);
135 free_thread (struct thread_info
*tp
)
137 clear_thread_inferior_resources (tp
);
141 if (tp
->private_dtor
)
142 tp
->private_dtor (tp
->private);
152 init_thread_list (void)
154 struct thread_info
*tp
, *tpnext
;
156 highest_thread_num
= 0;
161 for (tp
= thread_list
; tp
; tp
= tpnext
)
170 /* Allocate a new thread with target id PTID and add it to the thread
173 static struct thread_info
*
174 new_thread (ptid_t ptid
)
176 struct thread_info
*tp
;
178 tp
= xcalloc (1, sizeof (*tp
));
181 tp
->num
= ++highest_thread_num
;
182 tp
->next
= thread_list
;
185 /* Nothing to follow yet. */
186 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
187 tp
->state_
= THREAD_STOPPED
;
193 add_thread_silent (ptid_t ptid
)
195 struct thread_info
*tp
;
197 tp
= find_thread_ptid (ptid
);
199 /* Found an old thread with the same id. It has to be dead,
200 otherwise we wouldn't be adding a new thread with the same id.
201 The OS is reusing this id --- delete it, and recreate a new
204 /* In addition to deleting the thread, if this is the current
205 thread, then we need to take care that delete_thread doesn't
206 really delete the thread if it is inferior_ptid. Create a
207 new template thread in the list with an invalid ptid, switch
208 to it, delete the original thread, reset the new thread's
209 ptid, and switch to it. */
211 if (ptid_equal (inferior_ptid
, ptid
))
213 tp
= new_thread (null_ptid
);
215 /* Make switch_to_thread not read from the thread. */
216 tp
->state_
= THREAD_EXITED
;
217 switch_to_thread (null_ptid
);
219 /* Now we can delete it. */
220 delete_thread (ptid
);
222 /* Now reset its ptid, and reswitch inferior_ptid to it. */
224 tp
->state_
= THREAD_STOPPED
;
225 switch_to_thread (ptid
);
227 observer_notify_new_thread (tp
);
233 /* Just go ahead and delete it. */
234 delete_thread (ptid
);
237 tp
= new_thread (ptid
);
238 observer_notify_new_thread (tp
);
244 add_thread_with_info (ptid_t ptid
, struct private_thread_info
*private)
246 struct thread_info
*result
= add_thread_silent (ptid
);
248 result
->private = private;
250 if (print_thread_events
)
251 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid
));
253 annotate_new_thread ();
258 add_thread (ptid_t ptid
)
260 return add_thread_with_info (ptid
, NULL
);
263 /* Delete thread PTID. If SILENT, don't notify the observer of this
266 delete_thread_1 (ptid_t ptid
, int silent
)
268 struct thread_info
*tp
, *tpprev
;
272 for (tp
= thread_list
; tp
; tpprev
= tp
, tp
= tp
->next
)
273 if (ptid_equal (tp
->ptid
, ptid
))
279 /* If this is the current thread, or there's code out there that
280 relies on it existing (refcount > 0) we can't delete yet. Mark
281 it as exited, and notify it. */
283 || ptid_equal (tp
->ptid
, inferior_ptid
))
285 if (tp
->state_
!= THREAD_EXITED
)
287 observer_notify_thread_exit (tp
, silent
);
289 /* Tag it as exited. */
290 tp
->state_
= THREAD_EXITED
;
292 /* Clear breakpoints, etc. associated with this thread. */
293 clear_thread_inferior_resources (tp
);
296 /* Will be really deleted some other time. */
301 tpprev
->next
= tp
->next
;
303 thread_list
= tp
->next
;
305 /* Notify thread exit, but only if we haven't already. */
306 if (tp
->state_
!= THREAD_EXITED
)
307 observer_notify_thread_exit (tp
, silent
);
312 /* Delete thread PTID and notify of thread exit. If this is
313 inferior_ptid, don't actually delete it, but tag it as exited and
314 do the notification. If PTID is the user selected thread, clear
317 delete_thread (ptid_t ptid
)
319 delete_thread_1 (ptid
, 0 /* not silent */);
323 delete_thread_silent (ptid_t ptid
)
325 delete_thread_1 (ptid
, 1 /* silent */);
329 find_thread_id (int num
)
331 struct thread_info
*tp
;
333 for (tp
= thread_list
; tp
; tp
= tp
->next
)
340 /* Find a thread_info by matching PTID. */
342 find_thread_ptid (ptid_t ptid
)
344 struct thread_info
*tp
;
346 for (tp
= thread_list
; tp
; tp
= tp
->next
)
347 if (ptid_equal (tp
->ptid
, ptid
))
354 * Thread iterator function.
356 * Calls a callback function once for each thread, so long as
357 * the callback function returns false. If the callback function
358 * returns true, the iteration will end and the current thread
359 * will be returned. This can be useful for implementing a
360 * search for a thread with arbitrary attributes, or for applying
361 * some operation to every thread.
363 * FIXME: some of the existing functionality, such as
364 * "Thread apply all", might be rewritten using this functionality.
368 iterate_over_threads (int (*callback
) (struct thread_info
*, void *),
371 struct thread_info
*tp
, *next
;
373 for (tp
= thread_list
; tp
; tp
= next
)
376 if ((*callback
) (tp
, data
))
387 struct thread_info
*tp
;
389 for (tp
= thread_list
; tp
; tp
= tp
->next
)
396 valid_thread_id (int num
)
398 struct thread_info
*tp
;
400 for (tp
= thread_list
; tp
; tp
= tp
->next
)
408 pid_to_thread_id (ptid_t ptid
)
410 struct thread_info
*tp
;
412 for (tp
= thread_list
; tp
; tp
= tp
->next
)
413 if (ptid_equal (tp
->ptid
, ptid
))
420 thread_id_to_pid (int num
)
422 struct thread_info
*thread
= find_thread_id (num
);
427 return pid_to_ptid (-1);
431 in_thread_list (ptid_t ptid
)
433 struct thread_info
*tp
;
435 for (tp
= thread_list
; tp
; tp
= tp
->next
)
436 if (ptid_equal (tp
->ptid
, ptid
))
439 return 0; /* Never heard of 'im. */
442 /* Finds the first thread of the inferior given by PID. If PID is -1,
443 return the first thread in the list. */
446 first_thread_of_process (int pid
)
448 struct thread_info
*tp
, *ret
= NULL
;
450 for (tp
= thread_list
; tp
; tp
= tp
->next
)
451 if (pid
== -1 || ptid_get_pid (tp
->ptid
) == pid
)
452 if (ret
== NULL
|| tp
->num
< ret
->num
)
459 any_thread_of_process (int pid
)
461 struct thread_info
*tp
;
463 for (tp
= thread_list
; tp
; tp
= tp
->next
)
464 if (ptid_get_pid (tp
->ptid
) == pid
)
471 any_live_thread_of_process (int pid
)
473 struct thread_info
*tp
;
474 struct thread_info
*tp_executing
= NULL
;
476 for (tp
= thread_list
; tp
; tp
= tp
->next
)
477 if (tp
->state_
!= THREAD_EXITED
&& ptid_get_pid (tp
->ptid
) == pid
)
488 /* Print a list of thread ids currently known, and the total number of
489 threads. To be used from within catch_errors. */
491 do_captured_list_thread_ids (struct ui_out
*uiout
, void *arg
)
493 struct thread_info
*tp
;
495 struct cleanup
*cleanup_chain
;
496 int current_thread
= -1;
498 update_thread_list ();
500 cleanup_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "thread-ids");
502 for (tp
= thread_list
; tp
; tp
= tp
->next
)
504 if (tp
->state_
== THREAD_EXITED
)
507 if (ptid_equal (tp
->ptid
, inferior_ptid
))
508 current_thread
= tp
->num
;
511 ui_out_field_int (uiout
, "thread-id", tp
->num
);
514 do_cleanups (cleanup_chain
);
516 if (current_thread
!= -1)
517 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
518 ui_out_field_int (uiout
, "number-of-threads", num
);
522 /* Official gdblib interface function to get a list of thread ids and
525 gdb_list_thread_ids (struct ui_out
*uiout
, char **error_message
)
527 if (catch_exceptions_with_msg (uiout
, do_captured_list_thread_ids
, NULL
,
528 error_message
, RETURN_MASK_ALL
) < 0)
533 /* Return true if TP is an active thread. */
535 thread_alive (struct thread_info
*tp
)
537 if (tp
->state_
== THREAD_EXITED
)
539 if (!target_thread_alive (tp
->ptid
))
547 struct thread_info
*tp
, *next
;
549 for (tp
= thread_list
; tp
; tp
= next
)
552 if (!thread_alive (tp
))
553 delete_thread (tp
->ptid
);
558 thread_change_ptid (ptid_t old_ptid
, ptid_t new_ptid
)
560 struct inferior
*inf
;
561 struct thread_info
*tp
;
563 /* It can happen that what we knew as the target inferior id
564 changes. E.g, target remote may only discover the remote process
565 pid after adding the inferior to GDB's list. */
566 inf
= find_inferior_pid (ptid_get_pid (old_ptid
));
567 inf
->pid
= ptid_get_pid (new_ptid
);
569 tp
= find_thread_ptid (old_ptid
);
572 observer_notify_thread_ptid_changed (old_ptid
, new_ptid
);
576 set_running (ptid_t ptid
, int running
)
578 struct thread_info
*tp
;
579 int all
= ptid_equal (ptid
, minus_one_ptid
);
581 /* We try not to notify the observer if no thread has actually changed
582 the running state -- merely to reduce the number of messages to
583 frontend. Frontend is supposed to handle multiple *running just fine. */
584 if (all
|| ptid_is_pid (ptid
))
588 for (tp
= thread_list
; tp
; tp
= tp
->next
)
589 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
591 if (tp
->state_
== THREAD_EXITED
)
593 if (running
&& tp
->state_
== THREAD_STOPPED
)
595 tp
->state_
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
598 observer_notify_target_resumed (ptid
);
604 tp
= find_thread_ptid (ptid
);
606 gdb_assert (tp
->state_
!= THREAD_EXITED
);
607 if (running
&& tp
->state_
== THREAD_STOPPED
)
609 tp
->state_
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
611 observer_notify_target_resumed (ptid
);
616 is_thread_state (ptid_t ptid
, enum thread_state state
)
618 struct thread_info
*tp
;
620 tp
= find_thread_ptid (ptid
);
622 return tp
->state_
== state
;
626 is_stopped (ptid_t ptid
)
628 return is_thread_state (ptid
, THREAD_STOPPED
);
632 is_exited (ptid_t ptid
)
634 return is_thread_state (ptid
, THREAD_EXITED
);
638 is_running (ptid_t ptid
)
640 return is_thread_state (ptid
, THREAD_RUNNING
);
646 struct thread_info
*tp
;
648 for (tp
= thread_list
; tp
; tp
= tp
->next
)
649 if (tp
->state_
== THREAD_RUNNING
)
656 is_executing (ptid_t ptid
)
658 struct thread_info
*tp
;
660 tp
= find_thread_ptid (ptid
);
662 return tp
->executing_
;
666 set_executing (ptid_t ptid
, int executing
)
668 struct thread_info
*tp
;
669 int all
= ptid_equal (ptid
, minus_one_ptid
);
671 if (all
|| ptid_is_pid (ptid
))
673 for (tp
= thread_list
; tp
; tp
= tp
->next
)
674 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
675 tp
->executing_
= executing
;
679 tp
= find_thread_ptid (ptid
);
681 tp
->executing_
= executing
;
686 set_stop_requested (ptid_t ptid
, int stop
)
688 struct thread_info
*tp
;
689 int all
= ptid_equal (ptid
, minus_one_ptid
);
691 if (all
|| ptid_is_pid (ptid
))
693 for (tp
= thread_list
; tp
; tp
= tp
->next
)
694 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
695 tp
->stop_requested
= stop
;
699 tp
= find_thread_ptid (ptid
);
701 tp
->stop_requested
= stop
;
704 /* Call the stop requested observer so other components of GDB can
705 react to this request. */
707 observer_notify_thread_stop_requested (ptid
);
711 finish_thread_state (ptid_t ptid
)
713 struct thread_info
*tp
;
717 all
= ptid_equal (ptid
, minus_one_ptid
);
719 if (all
|| ptid_is_pid (ptid
))
721 for (tp
= thread_list
; tp
; tp
= tp
->next
)
723 if (tp
->state_
== THREAD_EXITED
)
725 if (all
|| ptid_get_pid (ptid
) == ptid_get_pid (tp
->ptid
))
727 if (tp
->executing_
&& tp
->state_
== THREAD_STOPPED
)
729 tp
->state_
= tp
->executing_
? THREAD_RUNNING
: THREAD_STOPPED
;
735 tp
= find_thread_ptid (ptid
);
737 if (tp
->state_
!= THREAD_EXITED
)
739 if (tp
->executing_
&& tp
->state_
== THREAD_STOPPED
)
741 tp
->state_
= tp
->executing_
? THREAD_RUNNING
: THREAD_STOPPED
;
746 observer_notify_target_resumed (ptid
);
750 finish_thread_state_cleanup (void *arg
)
752 ptid_t
*ptid_p
= arg
;
756 finish_thread_state (*ptid_p
);
759 /* Prints the list of threads and their details on UIOUT.
760 This is a version of 'info_threads_command' suitable for
762 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
763 that should be printed. Otherwise, all threads are
765 If PID is not -1, only print threads from the process PID.
766 Otherwise, threads from all attached PIDs are printed.
767 If both REQUESTED_THREAD and PID are not -1, then the thread
768 is printed if it belongs to the specified process. Otherwise,
769 an error is raised. */
771 print_thread_info (struct ui_out
*uiout
, char *requested_threads
, int pid
)
773 struct thread_info
*tp
;
775 struct cleanup
*old_chain
;
776 char *extra_info
, *name
, *target_id
;
777 int current_thread
= -1;
779 update_thread_list ();
780 current_ptid
= inferior_ptid
;
782 /* We'll be switching threads temporarily. */
783 old_chain
= make_cleanup_restore_current_thread ();
785 /* For backward compatibility, we make a list for MI. A table is
786 preferable for the CLI, though, because it shows table
788 if (ui_out_is_mi_like_p (uiout
))
789 make_cleanup_ui_out_list_begin_end (uiout
, "threads");
794 for (tp
= thread_list
; tp
; tp
= tp
->next
)
796 if (!number_is_in_list (requested_threads
, tp
->num
))
799 if (pid
!= -1 && PIDGET (tp
->ptid
) != pid
)
802 if (tp
->state_
== THREAD_EXITED
)
810 if (requested_threads
== NULL
|| *requested_threads
== '\0')
811 ui_out_message (uiout
, 0, _("No threads.\n"));
813 ui_out_message (uiout
, 0, _("No threads match '%s'.\n"),
815 do_cleanups (old_chain
);
819 make_cleanup_ui_out_table_begin_end (uiout
, 4, n_threads
, "threads");
821 ui_out_table_header (uiout
, 1, ui_left
, "current", "");
822 ui_out_table_header (uiout
, 4, ui_left
, "id", "Id");
823 ui_out_table_header (uiout
, 17, ui_left
, "target-id", "Target Id");
824 ui_out_table_header (uiout
, 1, ui_left
, "frame", "Frame");
825 ui_out_table_body (uiout
);
828 for (tp
= thread_list
; tp
; tp
= tp
->next
)
830 struct cleanup
*chain2
;
833 if (!number_is_in_list (requested_threads
, tp
->num
))
836 if (pid
!= -1 && PIDGET (tp
->ptid
) != pid
)
838 if (requested_threads
!= NULL
&& *requested_threads
!= '\0')
839 error (_("Requested thread not found in requested process"));
843 if (ptid_equal (tp
->ptid
, current_ptid
))
844 current_thread
= tp
->num
;
846 if (tp
->state_
== THREAD_EXITED
)
849 chain2
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
851 if (ui_out_is_mi_like_p (uiout
))
854 if (ptid_equal (tp
->ptid
, current_ptid
))
855 ui_out_text (uiout
, "* ");
857 ui_out_text (uiout
, " ");
861 if (ptid_equal (tp
->ptid
, current_ptid
))
862 ui_out_field_string (uiout
, "current", "*");
864 ui_out_field_skip (uiout
, "current");
867 ui_out_field_int (uiout
, "id", tp
->num
);
869 /* For the CLI, we stuff everything into the target-id field.
870 This is a gross hack to make the output come out looking
871 correct. The underlying problem here is that ui-out has no
872 way to specify that a field's space allocation should be
873 shared by several fields. For MI, we do the right thing
876 target_id
= target_pid_to_str (tp
->ptid
);
877 extra_info
= target_extra_thread_info (tp
);
878 name
= tp
->name
? tp
->name
: target_thread_name (tp
);
880 if (ui_out_is_mi_like_p (uiout
))
882 ui_out_field_string (uiout
, "target-id", target_id
);
884 ui_out_field_string (uiout
, "details", extra_info
);
886 ui_out_field_string (uiout
, "name", name
);
890 struct cleanup
*str_cleanup
;
893 if (extra_info
&& name
)
894 contents
= xstrprintf ("%s \"%s\" (%s)", target_id
,
897 contents
= xstrprintf ("%s (%s)", target_id
, extra_info
);
899 contents
= xstrprintf ("%s \"%s\"", target_id
, name
);
901 contents
= xstrdup (target_id
);
902 str_cleanup
= make_cleanup (xfree
, contents
);
904 ui_out_field_string (uiout
, "target-id", contents
);
905 do_cleanups (str_cleanup
);
908 if (tp
->state_
== THREAD_RUNNING
)
909 ui_out_text (uiout
, "(running)\n");
912 /* The switch below puts us at the top of the stack (leaf
914 switch_to_thread (tp
->ptid
);
915 print_stack_frame (get_selected_frame (NULL
),
916 /* For MI output, print frame level. */
917 ui_out_is_mi_like_p (uiout
),
921 if (ui_out_is_mi_like_p (uiout
))
923 char *state
= "stopped";
925 if (tp
->state_
== THREAD_RUNNING
)
927 ui_out_field_string (uiout
, "state", state
);
930 core
= target_core_of_thread (tp
->ptid
);
931 if (ui_out_is_mi_like_p (uiout
) && core
!= -1)
932 ui_out_field_int (uiout
, "core", core
);
934 do_cleanups (chain2
);
937 /* Restores the current thread and the frame selected before
938 the "info threads" command. */
939 do_cleanups (old_chain
);
941 if (pid
== -1 && requested_threads
== NULL
)
943 gdb_assert (current_thread
!= -1
945 || ptid_equal (inferior_ptid
, null_ptid
));
946 if (current_thread
!= -1 && ui_out_is_mi_like_p (uiout
))
947 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
949 if (current_thread
!= -1 && is_exited (current_ptid
))
950 ui_out_message (uiout
, 0, "\n\
951 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
954 && current_thread
== -1
955 && ptid_equal (current_ptid
, null_ptid
))
956 ui_out_message (uiout
, 0, "\n\
957 No selected thread. See `help thread'.\n");
961 /* Print information about currently known threads
963 Optional ARG is a thread id, or list of thread ids.
965 Note: this has the drawback that it _really_ switches
966 threads, which frees the frame cache. A no-side
967 effects info-threads command would be nicer. */
970 info_threads_command (char *arg
, int from_tty
)
972 print_thread_info (uiout
, arg
, -1);
975 /* Switch from one thread to another. */
978 switch_to_thread (ptid_t ptid
)
980 /* Switch the program space as well, if we can infer it from the now
981 current thread. Otherwise, it's up to the caller to select the
983 if (!ptid_equal (ptid
, null_ptid
))
985 struct inferior
*inf
;
987 inf
= find_inferior_pid (ptid_get_pid (ptid
));
988 gdb_assert (inf
!= NULL
);
989 set_current_program_space (inf
->pspace
);
990 set_current_inferior (inf
);
993 if (ptid_equal (ptid
, inferior_ptid
))
996 inferior_ptid
= ptid
;
997 reinit_frame_cache ();
998 registers_changed ();
1000 /* We don't check for is_stopped, because we're called at times
1001 while in the TARGET_RUNNING state, e.g., while handling an
1003 if (!ptid_equal (inferior_ptid
, null_ptid
)
1004 && !is_exited (ptid
)
1005 && !is_executing (ptid
))
1006 stop_pc
= regcache_read_pc (get_thread_regcache (ptid
));
1008 stop_pc
= ~(CORE_ADDR
) 0;
1012 restore_current_thread (ptid_t ptid
)
1014 switch_to_thread (ptid
);
1018 restore_selected_frame (struct frame_id a_frame_id
, int frame_level
)
1020 struct frame_info
*frame
= NULL
;
1023 /* This means there was no selected frame. */
1024 if (frame_level
== -1)
1026 select_frame (NULL
);
1030 gdb_assert (frame_level
>= 0);
1032 /* Restore by level first, check if the frame id is the same as
1033 expected. If that fails, try restoring by frame id. If that
1034 fails, nothing to do, just warn the user. */
1036 count
= frame_level
;
1037 frame
= find_relative_frame (get_current_frame (), &count
);
1040 /* The frame ids must match - either both valid or both outer_frame_id.
1041 The latter case is not failsafe, but since it's highly unlikely
1042 the search by level finds the wrong frame, it's 99.9(9)% of
1043 the time (for all practical purposes) safe. */
1044 && frame_id_eq (get_frame_id (frame
), a_frame_id
))
1046 /* Cool, all is fine. */
1047 select_frame (frame
);
1051 frame
= frame_find_by_id (a_frame_id
);
1054 /* Cool, refound it. */
1055 select_frame (frame
);
1059 /* Nothing else to do, the frame layout really changed. Select the
1060 innermost stack frame. */
1061 select_frame (get_current_frame ());
1063 /* Warn the user. */
1064 if (frame_level
> 0 && !ui_out_is_mi_like_p (uiout
))
1066 warning (_("Couldn't restore frame #%d in "
1067 "current thread, at reparsed frame #0\n"),
1069 /* For MI, we should probably have a notification about
1070 current frame change. But this error is not very
1071 likely, so don't bother for now. */
1072 print_stack_frame (get_selected_frame (NULL
), 1, SRC_LINE
);
1076 struct current_thread_cleanup
1078 ptid_t inferior_ptid
;
1079 struct frame_id selected_frame_id
;
1080 int selected_frame_level
;
1086 do_restore_current_thread_cleanup (void *arg
)
1088 struct thread_info
*tp
;
1089 struct current_thread_cleanup
*old
= arg
;
1091 tp
= find_thread_ptid (old
->inferior_ptid
);
1093 /* If the previously selected thread belonged to a process that has
1094 in the mean time been deleted (due to normal exit, detach, etc.),
1095 then don't revert back to it, but instead simply drop back to no
1098 && find_inferior_pid (ptid_get_pid (tp
->ptid
)) != NULL
)
1099 restore_current_thread (old
->inferior_ptid
);
1102 restore_current_thread (null_ptid
);
1103 set_current_inferior (find_inferior_id (old
->inf_id
));
1106 /* The running state of the originally selected thread may have
1107 changed, so we have to recheck it here. */
1108 if (!ptid_equal (inferior_ptid
, null_ptid
)
1110 && is_stopped (inferior_ptid
)
1111 && target_has_registers
1113 && target_has_memory
)
1114 restore_selected_frame (old
->selected_frame_id
,
1115 old
->selected_frame_level
);
1119 restore_current_thread_cleanup_dtor (void *arg
)
1121 struct current_thread_cleanup
*old
= arg
;
1122 struct thread_info
*tp
;
1124 tp
= find_thread_ptid (old
->inferior_ptid
);
1131 make_cleanup_restore_current_thread (void)
1133 struct thread_info
*tp
;
1134 struct frame_info
*frame
;
1135 struct current_thread_cleanup
*old
;
1137 old
= xmalloc (sizeof (struct current_thread_cleanup
));
1138 old
->inferior_ptid
= inferior_ptid
;
1139 old
->inf_id
= current_inferior ()->num
;
1141 if (!ptid_equal (inferior_ptid
, null_ptid
))
1143 old
->was_stopped
= is_stopped (inferior_ptid
);
1144 if (old
->was_stopped
1145 && target_has_registers
1147 && target_has_memory
)
1149 /* When processing internal events, there might not be a
1150 selected frame. If we naively call get_selected_frame
1151 here, then we can end up reading debuginfo for the
1152 current frame, but we don't generally need the debuginfo
1154 frame
= get_selected_frame_if_set ();
1159 old
->selected_frame_id
= get_frame_id (frame
);
1160 old
->selected_frame_level
= frame_relative_level (frame
);
1162 tp
= find_thread_ptid (inferior_ptid
);
1167 return make_cleanup_dtor (do_restore_current_thread_cleanup
, old
,
1168 restore_current_thread_cleanup_dtor
);
1171 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1172 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1173 of two numbers seperated by a hyphen. Examples:
1175 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1176 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1177 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1180 thread_apply_all_command (char *cmd
, int from_tty
)
1182 struct thread_info
*tp
;
1183 struct cleanup
*old_chain
;
1186 if (cmd
== NULL
|| *cmd
== '\000')
1187 error (_("Please specify a command following the thread ID list"));
1189 update_thread_list ();
1191 old_chain
= make_cleanup_restore_current_thread ();
1193 /* Save a copy of the command in case it is clobbered by
1195 saved_cmd
= xstrdup (cmd
);
1196 make_cleanup (xfree
, saved_cmd
);
1197 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1198 if (thread_alive (tp
))
1200 switch_to_thread (tp
->ptid
);
1202 printf_filtered (_("\nThread %d (%s):\n"),
1203 tp
->num
, target_pid_to_str (inferior_ptid
));
1204 execute_command (cmd
, from_tty
);
1205 strcpy (cmd
, saved_cmd
); /* Restore exact command used
1209 do_cleanups (old_chain
);
1213 thread_apply_command (char *tidlist
, int from_tty
)
1216 struct cleanup
*old_chain
;
1218 struct get_number_or_range_state state
;
1220 if (tidlist
== NULL
|| *tidlist
== '\000')
1221 error (_("Please specify a thread ID list"));
1223 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
1226 error (_("Please specify a command following the thread ID list"));
1228 /* Save a copy of the command in case it is clobbered by
1230 saved_cmd
= xstrdup (cmd
);
1231 old_chain
= make_cleanup (xfree
, saved_cmd
);
1233 init_number_or_range (&state
, tidlist
);
1234 while (!state
.finished
&& state
.string
< cmd
)
1236 struct thread_info
*tp
;
1240 start
= get_number_or_range (&state
);
1242 make_cleanup_restore_current_thread ();
1244 tp
= find_thread_id (start
);
1247 warning (_("Unknown thread %d."), start
);
1248 else if (!thread_alive (tp
))
1249 warning (_("Thread %d has terminated."), start
);
1252 switch_to_thread (tp
->ptid
);
1254 printf_filtered (_("\nThread %d (%s):\n"), tp
->num
,
1255 target_pid_to_str (inferior_ptid
));
1256 execute_command (cmd
, from_tty
);
1258 /* Restore exact command used previously. */
1259 strcpy (cmd
, saved_cmd
);
1263 do_cleanups (old_chain
);
1266 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1267 if prefix of arg is `apply'. */
1270 thread_command (char *tidstr
, int from_tty
)
1274 if (ptid_equal (inferior_ptid
, null_ptid
))
1275 error (_("No thread selected"));
1277 if (target_has_stack
)
1279 if (is_exited (inferior_ptid
))
1280 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1281 pid_to_thread_id (inferior_ptid
),
1282 target_pid_to_str (inferior_ptid
));
1284 printf_filtered (_("[Current thread is %d (%s)]\n"),
1285 pid_to_thread_id (inferior_ptid
),
1286 target_pid_to_str (inferior_ptid
));
1289 error (_("No stack."));
1293 gdb_thread_select (uiout
, tidstr
, NULL
);
1296 /* Implementation of `thread name'. */
1299 thread_name_command (char *arg
, int from_tty
)
1301 struct thread_info
*info
;
1303 if (ptid_equal (inferior_ptid
, null_ptid
))
1304 error (_("No thread selected"));
1306 while (arg
&& isspace (*arg
))
1309 info
= inferior_thread ();
1311 info
->name
= arg
? xstrdup (arg
) : NULL
;
1314 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1317 thread_find_command (char *arg
, int from_tty
)
1319 struct thread_info
*tp
;
1321 unsigned long match
= 0;
1323 if (arg
== NULL
|| *arg
== '\0')
1324 error (_("Command requires an argument."));
1326 tmp
= re_comp (arg
);
1328 error (_("Invalid regexp (%s): %s"), tmp
, arg
);
1330 update_thread_list ();
1331 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1333 if (tp
->name
!= NULL
&& re_exec (tp
->name
))
1335 printf_filtered (_("Thread %d has name '%s'\n"),
1340 tmp
= target_thread_name (tp
);
1341 if (tmp
!= NULL
&& re_exec (tmp
))
1343 printf_filtered (_("Thread %d has target name '%s'\n"),
1348 tmp
= target_pid_to_str (tp
->ptid
);
1349 if (tmp
!= NULL
&& re_exec (tmp
))
1351 printf_filtered (_("Thread %d has target id '%s'\n"),
1356 tmp
= target_extra_thread_info (tp
);
1357 if (tmp
!= NULL
&& re_exec (tmp
))
1359 printf_filtered (_("Thread %d has extra info '%s'\n"),
1365 printf_filtered (_("No threads match '%s'\n"), arg
);
1368 /* Print notices when new threads are attached and detached. */
1369 int print_thread_events
= 1;
1371 show_print_thread_events (struct ui_file
*file
, int from_tty
,
1372 struct cmd_list_element
*c
, const char *value
)
1374 fprintf_filtered (file
,
1375 _("Printing of thread events is %s.\n"),
1380 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
1383 struct thread_info
*tp
;
1385 num
= value_as_long (parse_and_eval (tidstr
));
1387 tp
= find_thread_id (num
);
1390 error (_("Thread ID %d not known."), num
);
1392 if (!thread_alive (tp
))
1393 error (_("Thread ID %d has terminated."), num
);
1395 switch_to_thread (tp
->ptid
);
1397 annotate_thread_changed ();
1399 ui_out_text (uiout
, "[Switching to thread ");
1400 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
1401 ui_out_text (uiout
, " (");
1402 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
1403 ui_out_text (uiout
, ")]");
1405 /* Note that we can't reach this with an exited thread, due to the
1406 thread_alive check above. */
1407 if (tp
->state_
== THREAD_RUNNING
)
1408 ui_out_text (uiout
, "(running)\n");
1411 ui_out_text (uiout
, "\n");
1412 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1415 /* Since the current thread may have changed, see if there is any
1416 exited thread we can now delete. */
1423 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
, char **error_message
)
1425 if (catch_exceptions_with_msg (uiout
, do_captured_thread_select
, tidstr
,
1426 error_message
, RETURN_MASK_ALL
) < 0)
1432 update_thread_list (void)
1435 target_find_new_threads ();
1438 /* Return a new value for the selected thread's id. Return a value of 0 if
1439 no thread is selected, or no threads exist. */
1441 static struct value
*
1442 thread_id_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
)
1444 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
1446 return value_from_longest (builtin_type (gdbarch
)->builtin_int
,
1447 (tp
? tp
->num
: 0));
1450 /* Commands with a prefix of `thread'. */
1451 struct cmd_list_element
*thread_cmd_list
= NULL
;
1454 _initialize_thread (void)
1456 static struct cmd_list_element
*thread_apply_list
= NULL
;
1458 add_info ("threads", info_threads_command
,
1459 _("Display currently known threads.\n\
1460 Usage: info threads [ID]...\n\
1461 Optional arguments are thread IDs with spaces between.\n\
1462 If no arguments, all threads are displayed."));
1464 add_prefix_cmd ("thread", class_run
, thread_command
, _("\
1465 Use this command to switch between threads.\n\
1466 The new thread ID must be currently known."),
1467 &thread_cmd_list
, "thread ", 1, &cmdlist
);
1469 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
1470 _("Apply a command to a list of threads."),
1471 &thread_apply_list
, "thread apply ", 1, &thread_cmd_list
);
1473 add_cmd ("all", class_run
, thread_apply_all_command
,
1474 _("Apply a command to all threads."), &thread_apply_list
);
1476 add_cmd ("name", class_run
, thread_name_command
,
1477 _("Set the current thread's name.\n\
1478 Usage: thread name [NAME]\n\
1479 If NAME is not given, then any existing name is removed."), &thread_cmd_list
);
1481 add_cmd ("find", class_run
, thread_find_command
, _("\
1482 Find threads that match a regular expression.\n\
1483 Usage: thread find REGEXP\n\
1484 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1488 add_com_alias ("t", "thread", class_run
, 1);
1490 add_setshow_boolean_cmd ("thread-events", no_class
,
1491 &print_thread_events
, _("\
1492 Set printing of thread events (such as thread start and exit)."), _("\
1493 Show printing of thread events (such as thread start and exit)."), NULL
,
1495 show_print_thread_events
,
1496 &setprintlist
, &showprintlist
);
1498 create_internalvar_type_lazy ("_thread", thread_id_make_value
);