1 /* Multi-process/thread control for GDB, the GNU debugger.
3 Copyright (C) 1986-2014 Free Software Foundation, Inc.
5 Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
29 #include "gdbthread.h"
30 #include "exceptions.h"
38 #include <sys/types.h>
43 #include "cli/cli-decode.h"
44 #include "gdb_regex.h"
45 #include "cli/cli-utils.h"
46 #include "continuations.h"
48 /* Definition of struct thread_info exported to gdbthread.h. */
50 /* Prototypes for exported functions. */
52 void _initialize_thread (void);
54 /* Prototypes for local functions. */
56 struct thread_info
*thread_list
= NULL
;
57 static int highest_thread_num
;
59 static void thread_command (char *tidstr
, int from_tty
);
60 static void thread_apply_all_command (char *, int);
61 static int thread_alive (struct thread_info
*);
62 static void info_threads_command (char *, int);
63 static void thread_apply_command (char *, int);
64 static void restore_current_thread (ptid_t
);
65 static void prune_threads (void);
67 /* Data to cleanup thread array. */
69 struct thread_array_cleanup
71 /* Array of thread pointers used to set
73 struct thread_info
**tp_array
;
75 /* Thread count in the array. */
81 inferior_thread (void)
83 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
89 delete_step_resume_breakpoint (struct thread_info
*tp
)
91 if (tp
&& tp
->control
.step_resume_breakpoint
)
93 delete_breakpoint (tp
->control
.step_resume_breakpoint
);
94 tp
->control
.step_resume_breakpoint
= NULL
;
99 delete_exception_resume_breakpoint (struct thread_info
*tp
)
101 if (tp
&& tp
->control
.exception_resume_breakpoint
)
103 delete_breakpoint (tp
->control
.exception_resume_breakpoint
);
104 tp
->control
.exception_resume_breakpoint
= NULL
;
109 clear_thread_inferior_resources (struct thread_info
*tp
)
111 /* NOTE: this will take care of any left-over step_resume breakpoints,
112 but not any user-specified thread-specific breakpoints. We can not
113 delete the breakpoint straight-off, because the inferior might not
114 be stopped at the moment. */
115 if (tp
->control
.step_resume_breakpoint
)
117 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
118 tp
->control
.step_resume_breakpoint
= NULL
;
121 if (tp
->control
.exception_resume_breakpoint
)
123 tp
->control
.exception_resume_breakpoint
->disposition
124 = disp_del_at_next_stop
;
125 tp
->control
.exception_resume_breakpoint
= NULL
;
128 delete_longjmp_breakpoint_at_next_stop (tp
->num
);
130 bpstat_clear (&tp
->control
.stop_bpstat
);
132 btrace_teardown (tp
);
134 do_all_intermediate_continuations_thread (tp
, 1);
135 do_all_continuations_thread (tp
, 1);
139 free_thread (struct thread_info
*tp
)
143 if (tp
->private_dtor
)
144 tp
->private_dtor (tp
->private);
154 init_thread_list (void)
156 struct thread_info
*tp
, *tpnext
;
158 highest_thread_num
= 0;
163 for (tp
= thread_list
; tp
; tp
= tpnext
)
172 /* Allocate a new thread with target id PTID and add it to the thread
175 static struct thread_info
*
176 new_thread (ptid_t ptid
)
178 struct thread_info
*tp
;
180 tp
= xcalloc (1, sizeof (*tp
));
183 tp
->num
= ++highest_thread_num
;
184 tp
->next
= thread_list
;
187 /* Nothing to follow yet. */
188 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
189 tp
->state
= THREAD_STOPPED
;
195 add_thread_silent (ptid_t ptid
)
197 struct thread_info
*tp
;
199 tp
= find_thread_ptid (ptid
);
201 /* Found an old thread with the same id. It has to be dead,
202 otherwise we wouldn't be adding a new thread with the same id.
203 The OS is reusing this id --- delete it, and recreate a new
206 /* In addition to deleting the thread, if this is the current
207 thread, then we need to take care that delete_thread doesn't
208 really delete the thread if it is inferior_ptid. Create a
209 new template thread in the list with an invalid ptid, switch
210 to it, delete the original thread, reset the new thread's
211 ptid, and switch to it. */
213 if (ptid_equal (inferior_ptid
, ptid
))
215 tp
= new_thread (null_ptid
);
217 /* Make switch_to_thread not read from the thread. */
218 tp
->state
= THREAD_EXITED
;
219 switch_to_thread (null_ptid
);
221 /* Now we can delete it. */
222 delete_thread (ptid
);
224 /* Now reset its ptid, and reswitch inferior_ptid to it. */
226 tp
->state
= THREAD_STOPPED
;
227 switch_to_thread (ptid
);
229 observer_notify_new_thread (tp
);
235 /* Just go ahead and delete it. */
236 delete_thread (ptid
);
239 tp
= new_thread (ptid
);
240 observer_notify_new_thread (tp
);
246 add_thread_with_info (ptid_t ptid
, struct private_thread_info
*private)
248 struct thread_info
*result
= add_thread_silent (ptid
);
250 result
->private = private;
252 if (print_thread_events
)
253 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid
));
255 annotate_new_thread ();
260 add_thread (ptid_t ptid
)
262 return add_thread_with_info (ptid
, NULL
);
265 /* Delete thread PTID. If SILENT, don't notify the observer of this
268 delete_thread_1 (ptid_t ptid
, int silent
)
270 struct thread_info
*tp
, *tpprev
;
274 for (tp
= thread_list
; tp
; tpprev
= tp
, tp
= tp
->next
)
275 if (ptid_equal (tp
->ptid
, ptid
))
281 /* If this is the current thread, or there's code out there that
282 relies on it existing (refcount > 0) we can't delete yet. Mark
283 it as exited, and notify it. */
285 || ptid_equal (tp
->ptid
, inferior_ptid
))
287 if (tp
->state
!= THREAD_EXITED
)
289 observer_notify_thread_exit (tp
, silent
);
291 /* Tag it as exited. */
292 tp
->state
= THREAD_EXITED
;
294 /* Clear breakpoints, etc. associated with this thread. */
295 clear_thread_inferior_resources (tp
);
298 /* Will be really deleted some other time. */
302 /* Notify thread exit, but only if we haven't already. */
303 if (tp
->state
!= THREAD_EXITED
)
304 observer_notify_thread_exit (tp
, silent
);
306 /* Tag it as exited. */
307 tp
->state
= THREAD_EXITED
;
308 clear_thread_inferior_resources (tp
);
311 tpprev
->next
= tp
->next
;
313 thread_list
= tp
->next
;
318 /* Delete thread PTID and notify of thread exit. If this is
319 inferior_ptid, don't actually delete it, but tag it as exited and
320 do the notification. If PTID is the user selected thread, clear
323 delete_thread (ptid_t ptid
)
325 delete_thread_1 (ptid
, 0 /* not silent */);
329 delete_thread_silent (ptid_t ptid
)
331 delete_thread_1 (ptid
, 1 /* silent */);
335 find_thread_id (int num
)
337 struct thread_info
*tp
;
339 for (tp
= thread_list
; tp
; tp
= tp
->next
)
346 /* Find a thread_info by matching PTID. */
348 find_thread_ptid (ptid_t ptid
)
350 struct thread_info
*tp
;
352 for (tp
= thread_list
; tp
; tp
= tp
->next
)
353 if (ptid_equal (tp
->ptid
, ptid
))
360 * Thread iterator function.
362 * Calls a callback function once for each thread, so long as
363 * the callback function returns false. If the callback function
364 * returns true, the iteration will end and the current thread
365 * will be returned. This can be useful for implementing a
366 * search for a thread with arbitrary attributes, or for applying
367 * some operation to every thread.
369 * FIXME: some of the existing functionality, such as
370 * "Thread apply all", might be rewritten using this functionality.
374 iterate_over_threads (int (*callback
) (struct thread_info
*, void *),
377 struct thread_info
*tp
, *next
;
379 for (tp
= thread_list
; tp
; tp
= next
)
382 if ((*callback
) (tp
, data
))
393 struct thread_info
*tp
;
395 for (tp
= thread_list
; tp
; tp
= tp
->next
)
402 valid_thread_id (int num
)
404 struct thread_info
*tp
;
406 for (tp
= thread_list
; tp
; tp
= tp
->next
)
414 pid_to_thread_id (ptid_t ptid
)
416 struct thread_info
*tp
;
418 for (tp
= thread_list
; tp
; tp
= tp
->next
)
419 if (ptid_equal (tp
->ptid
, ptid
))
426 thread_id_to_pid (int num
)
428 struct thread_info
*thread
= find_thread_id (num
);
433 return pid_to_ptid (-1);
437 in_thread_list (ptid_t ptid
)
439 struct thread_info
*tp
;
441 for (tp
= thread_list
; tp
; tp
= tp
->next
)
442 if (ptid_equal (tp
->ptid
, ptid
))
445 return 0; /* Never heard of 'im. */
448 /* Finds the first thread of the inferior given by PID. If PID is -1,
449 return the first thread in the list. */
452 first_thread_of_process (int pid
)
454 struct thread_info
*tp
, *ret
= NULL
;
456 for (tp
= thread_list
; tp
; tp
= tp
->next
)
457 if (pid
== -1 || ptid_get_pid (tp
->ptid
) == pid
)
458 if (ret
== NULL
|| tp
->num
< ret
->num
)
465 any_thread_of_process (int pid
)
467 struct thread_info
*tp
;
469 gdb_assert (pid
!= 0);
471 /* Prefer the current thread. */
472 if (ptid_get_pid (inferior_ptid
) == pid
)
473 return inferior_thread ();
475 ALL_NON_EXITED_THREADS (tp
)
476 if (ptid_get_pid (tp
->ptid
) == pid
)
483 any_live_thread_of_process (int pid
)
485 struct thread_info
*curr_tp
= NULL
;
486 struct thread_info
*tp
;
487 struct thread_info
*tp_executing
= NULL
;
489 gdb_assert (pid
!= 0);
491 /* Prefer the current thread if it's not executing. */
492 if (ptid_get_pid (inferior_ptid
) == pid
)
494 /* If the current thread is dead, forget it. If it's not
495 executing, use it. Otherwise, still choose it (below), but
496 only if no other non-executing thread is found. */
497 curr_tp
= inferior_thread ();
498 if (curr_tp
->state
== THREAD_EXITED
)
500 else if (!curr_tp
->executing
)
504 ALL_NON_EXITED_THREADS (tp
)
505 if (ptid_get_pid (tp
->ptid
) == pid
)
513 /* If both the current thread and all live threads are executing,
514 prefer the current thread. */
518 /* Otherwise, just return an executing thread, if any. */
522 /* Print a list of thread ids currently known, and the total number of
523 threads. To be used from within catch_errors. */
525 do_captured_list_thread_ids (struct ui_out
*uiout
, void *arg
)
527 struct thread_info
*tp
;
529 struct cleanup
*cleanup_chain
;
530 int current_thread
= -1;
532 update_thread_list ();
534 cleanup_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "thread-ids");
536 for (tp
= thread_list
; tp
; tp
= tp
->next
)
538 if (tp
->state
== THREAD_EXITED
)
541 if (ptid_equal (tp
->ptid
, inferior_ptid
))
542 current_thread
= tp
->num
;
545 ui_out_field_int (uiout
, "thread-id", tp
->num
);
548 do_cleanups (cleanup_chain
);
550 if (current_thread
!= -1)
551 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
552 ui_out_field_int (uiout
, "number-of-threads", num
);
556 /* Official gdblib interface function to get a list of thread ids and
559 gdb_list_thread_ids (struct ui_out
*uiout
, char **error_message
)
561 if (catch_exceptions_with_msg (uiout
, do_captured_list_thread_ids
, NULL
,
562 error_message
, RETURN_MASK_ALL
) < 0)
567 /* Return true if TP is an active thread. */
569 thread_alive (struct thread_info
*tp
)
571 if (tp
->state
== THREAD_EXITED
)
573 if (!target_thread_alive (tp
->ptid
))
581 struct thread_info
*tp
, *next
;
583 for (tp
= thread_list
; tp
; tp
= next
)
586 if (!thread_alive (tp
))
587 delete_thread (tp
->ptid
);
592 thread_change_ptid (ptid_t old_ptid
, ptid_t new_ptid
)
594 struct inferior
*inf
;
595 struct thread_info
*tp
;
597 /* It can happen that what we knew as the target inferior id
598 changes. E.g, target remote may only discover the remote process
599 pid after adding the inferior to GDB's list. */
600 inf
= find_inferior_pid (ptid_get_pid (old_ptid
));
601 inf
->pid
= ptid_get_pid (new_ptid
);
603 tp
= find_thread_ptid (old_ptid
);
606 observer_notify_thread_ptid_changed (old_ptid
, new_ptid
);
610 set_running (ptid_t ptid
, int running
)
612 struct thread_info
*tp
;
613 int all
= ptid_equal (ptid
, minus_one_ptid
);
615 /* We try not to notify the observer if no thread has actually changed
616 the running state -- merely to reduce the number of messages to
617 frontend. Frontend is supposed to handle multiple *running just fine. */
618 if (all
|| ptid_is_pid (ptid
))
622 for (tp
= thread_list
; tp
; tp
= tp
->next
)
623 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
625 if (tp
->state
== THREAD_EXITED
)
627 if (running
&& tp
->state
== THREAD_STOPPED
)
629 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
632 observer_notify_target_resumed (ptid
);
638 tp
= find_thread_ptid (ptid
);
640 gdb_assert (tp
->state
!= THREAD_EXITED
);
641 if (running
&& tp
->state
== THREAD_STOPPED
)
643 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
645 observer_notify_target_resumed (ptid
);
650 is_thread_state (ptid_t ptid
, enum thread_state state
)
652 struct thread_info
*tp
;
654 tp
= find_thread_ptid (ptid
);
656 return tp
->state
== state
;
660 is_stopped (ptid_t ptid
)
662 return is_thread_state (ptid
, THREAD_STOPPED
);
666 is_exited (ptid_t ptid
)
668 return is_thread_state (ptid
, THREAD_EXITED
);
672 is_running (ptid_t ptid
)
674 return is_thread_state (ptid
, THREAD_RUNNING
);
678 is_executing (ptid_t ptid
)
680 struct thread_info
*tp
;
682 tp
= find_thread_ptid (ptid
);
684 return tp
->executing
;
688 set_executing (ptid_t ptid
, int executing
)
690 struct thread_info
*tp
;
691 int all
= ptid_equal (ptid
, minus_one_ptid
);
693 if (all
|| ptid_is_pid (ptid
))
695 for (tp
= thread_list
; tp
; tp
= tp
->next
)
696 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
697 tp
->executing
= executing
;
701 tp
= find_thread_ptid (ptid
);
703 tp
->executing
= executing
;
708 set_stop_requested (ptid_t ptid
, int stop
)
710 struct thread_info
*tp
;
711 int all
= ptid_equal (ptid
, minus_one_ptid
);
713 if (all
|| ptid_is_pid (ptid
))
715 for (tp
= thread_list
; tp
; tp
= tp
->next
)
716 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
717 tp
->stop_requested
= stop
;
721 tp
= find_thread_ptid (ptid
);
723 tp
->stop_requested
= stop
;
726 /* Call the stop requested observer so other components of GDB can
727 react to this request. */
729 observer_notify_thread_stop_requested (ptid
);
733 finish_thread_state (ptid_t ptid
)
735 struct thread_info
*tp
;
739 all
= ptid_equal (ptid
, minus_one_ptid
);
741 if (all
|| ptid_is_pid (ptid
))
743 for (tp
= thread_list
; tp
; tp
= tp
->next
)
745 if (tp
->state
== THREAD_EXITED
)
747 if (all
|| ptid_get_pid (ptid
) == ptid_get_pid (tp
->ptid
))
749 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
751 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
757 tp
= find_thread_ptid (ptid
);
759 if (tp
->state
!= THREAD_EXITED
)
761 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
763 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
768 observer_notify_target_resumed (ptid
);
772 finish_thread_state_cleanup (void *arg
)
774 ptid_t
*ptid_p
= arg
;
778 finish_thread_state (*ptid_p
);
782 pc_in_thread_step_range (CORE_ADDR pc
, struct thread_info
*thread
)
784 return (pc
>= thread
->control
.step_range_start
785 && pc
< thread
->control
.step_range_end
);
788 /* Prints the list of threads and their details on UIOUT.
789 This is a version of 'info_threads_command' suitable for
791 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
792 that should be printed. Otherwise, all threads are
794 If PID is not -1, only print threads from the process PID.
795 Otherwise, threads from all attached PIDs are printed.
796 If both REQUESTED_THREAD and PID are not -1, then the thread
797 is printed if it belongs to the specified process. Otherwise,
798 an error is raised. */
800 print_thread_info (struct ui_out
*uiout
, char *requested_threads
, int pid
)
802 struct thread_info
*tp
;
804 struct cleanup
*old_chain
;
805 char *extra_info
, *name
, *target_id
;
806 int current_thread
= -1;
808 update_thread_list ();
809 current_ptid
= inferior_ptid
;
811 /* We'll be switching threads temporarily. */
812 old_chain
= make_cleanup_restore_current_thread ();
814 /* For backward compatibility, we make a list for MI. A table is
815 preferable for the CLI, though, because it shows table
817 if (ui_out_is_mi_like_p (uiout
))
818 make_cleanup_ui_out_list_begin_end (uiout
, "threads");
823 for (tp
= thread_list
; tp
; tp
= tp
->next
)
825 if (!number_is_in_list (requested_threads
, tp
->num
))
828 if (pid
!= -1 && ptid_get_pid (tp
->ptid
) != pid
)
831 if (tp
->state
== THREAD_EXITED
)
839 if (requested_threads
== NULL
|| *requested_threads
== '\0')
840 ui_out_message (uiout
, 0, _("No threads.\n"));
842 ui_out_message (uiout
, 0, _("No threads match '%s'.\n"),
844 do_cleanups (old_chain
);
848 make_cleanup_ui_out_table_begin_end (uiout
, 4, n_threads
, "threads");
850 ui_out_table_header (uiout
, 1, ui_left
, "current", "");
851 ui_out_table_header (uiout
, 4, ui_left
, "id", "Id");
852 ui_out_table_header (uiout
, 17, ui_left
, "target-id", "Target Id");
853 ui_out_table_header (uiout
, 1, ui_left
, "frame", "Frame");
854 ui_out_table_body (uiout
);
857 for (tp
= thread_list
; tp
; tp
= tp
->next
)
859 struct cleanup
*chain2
;
862 if (!number_is_in_list (requested_threads
, tp
->num
))
865 if (pid
!= -1 && ptid_get_pid (tp
->ptid
) != pid
)
867 if (requested_threads
!= NULL
&& *requested_threads
!= '\0')
868 error (_("Requested thread not found in requested process"));
872 if (ptid_equal (tp
->ptid
, current_ptid
))
873 current_thread
= tp
->num
;
875 if (tp
->state
== THREAD_EXITED
)
878 chain2
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
880 if (ui_out_is_mi_like_p (uiout
))
883 if (ptid_equal (tp
->ptid
, current_ptid
))
884 ui_out_text (uiout
, "* ");
886 ui_out_text (uiout
, " ");
890 if (ptid_equal (tp
->ptid
, current_ptid
))
891 ui_out_field_string (uiout
, "current", "*");
893 ui_out_field_skip (uiout
, "current");
896 ui_out_field_int (uiout
, "id", tp
->num
);
898 /* For the CLI, we stuff everything into the target-id field.
899 This is a gross hack to make the output come out looking
900 correct. The underlying problem here is that ui-out has no
901 way to specify that a field's space allocation should be
902 shared by several fields. For MI, we do the right thing
905 target_id
= target_pid_to_str (tp
->ptid
);
906 extra_info
= target_extra_thread_info (tp
);
907 name
= tp
->name
? tp
->name
: target_thread_name (tp
);
909 if (ui_out_is_mi_like_p (uiout
))
911 ui_out_field_string (uiout
, "target-id", target_id
);
913 ui_out_field_string (uiout
, "details", extra_info
);
915 ui_out_field_string (uiout
, "name", name
);
919 struct cleanup
*str_cleanup
;
922 if (extra_info
&& name
)
923 contents
= xstrprintf ("%s \"%s\" (%s)", target_id
,
926 contents
= xstrprintf ("%s (%s)", target_id
, extra_info
);
928 contents
= xstrprintf ("%s \"%s\"", target_id
, name
);
930 contents
= xstrdup (target_id
);
931 str_cleanup
= make_cleanup (xfree
, contents
);
933 ui_out_field_string (uiout
, "target-id", contents
);
934 do_cleanups (str_cleanup
);
937 if (tp
->state
== THREAD_RUNNING
)
938 ui_out_text (uiout
, "(running)\n");
941 /* The switch below puts us at the top of the stack (leaf
943 switch_to_thread (tp
->ptid
);
944 print_stack_frame (get_selected_frame (NULL
),
945 /* For MI output, print frame level. */
946 ui_out_is_mi_like_p (uiout
),
950 if (ui_out_is_mi_like_p (uiout
))
952 char *state
= "stopped";
954 if (tp
->state
== THREAD_RUNNING
)
956 ui_out_field_string (uiout
, "state", state
);
959 core
= target_core_of_thread (tp
->ptid
);
960 if (ui_out_is_mi_like_p (uiout
) && core
!= -1)
961 ui_out_field_int (uiout
, "core", core
);
963 do_cleanups (chain2
);
966 /* Restores the current thread and the frame selected before
967 the "info threads" command. */
968 do_cleanups (old_chain
);
970 if (pid
== -1 && requested_threads
== NULL
)
972 gdb_assert (current_thread
!= -1
974 || ptid_equal (inferior_ptid
, null_ptid
));
975 if (current_thread
!= -1 && ui_out_is_mi_like_p (uiout
))
976 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
978 if (current_thread
!= -1 && is_exited (current_ptid
))
979 ui_out_message (uiout
, 0, "\n\
980 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
983 && current_thread
== -1
984 && ptid_equal (current_ptid
, null_ptid
))
985 ui_out_message (uiout
, 0, "\n\
986 No selected thread. See `help thread'.\n");
990 /* Print information about currently known threads
992 Optional ARG is a thread id, or list of thread ids.
994 Note: this has the drawback that it _really_ switches
995 threads, which frees the frame cache. A no-side
996 effects info-threads command would be nicer. */
999 info_threads_command (char *arg
, int from_tty
)
1001 print_thread_info (current_uiout
, arg
, -1);
1004 /* Switch from one thread to another. */
1007 switch_to_thread (ptid_t ptid
)
1009 /* Switch the program space as well, if we can infer it from the now
1010 current thread. Otherwise, it's up to the caller to select the
1012 if (!ptid_equal (ptid
, null_ptid
))
1014 struct inferior
*inf
;
1016 inf
= find_inferior_pid (ptid_get_pid (ptid
));
1017 gdb_assert (inf
!= NULL
);
1018 set_current_program_space (inf
->pspace
);
1019 set_current_inferior (inf
);
1022 if (ptid_equal (ptid
, inferior_ptid
))
1025 inferior_ptid
= ptid
;
1026 reinit_frame_cache ();
1028 /* We don't check for is_stopped, because we're called at times
1029 while in the TARGET_RUNNING state, e.g., while handling an
1031 if (!ptid_equal (inferior_ptid
, null_ptid
)
1032 && !is_exited (ptid
)
1033 && !is_executing (ptid
))
1034 stop_pc
= regcache_read_pc (get_thread_regcache (ptid
));
1036 stop_pc
= ~(CORE_ADDR
) 0;
1040 restore_current_thread (ptid_t ptid
)
1042 switch_to_thread (ptid
);
1046 restore_selected_frame (struct frame_id a_frame_id
, int frame_level
)
1048 struct frame_info
*frame
= NULL
;
1051 /* This means there was no selected frame. */
1052 if (frame_level
== -1)
1054 select_frame (NULL
);
1058 gdb_assert (frame_level
>= 0);
1060 /* Restore by level first, check if the frame id is the same as
1061 expected. If that fails, try restoring by frame id. If that
1062 fails, nothing to do, just warn the user. */
1064 count
= frame_level
;
1065 frame
= find_relative_frame (get_current_frame (), &count
);
1068 /* The frame ids must match - either both valid or both outer_frame_id.
1069 The latter case is not failsafe, but since it's highly unlikely
1070 the search by level finds the wrong frame, it's 99.9(9)% of
1071 the time (for all practical purposes) safe. */
1072 && frame_id_eq (get_frame_id (frame
), a_frame_id
))
1074 /* Cool, all is fine. */
1075 select_frame (frame
);
1079 frame
= frame_find_by_id (a_frame_id
);
1082 /* Cool, refound it. */
1083 select_frame (frame
);
1087 /* Nothing else to do, the frame layout really changed. Select the
1088 innermost stack frame. */
1089 select_frame (get_current_frame ());
1091 /* Warn the user. */
1092 if (frame_level
> 0 && !ui_out_is_mi_like_p (current_uiout
))
1094 warning (_("Couldn't restore frame #%d in "
1095 "current thread. Bottom (innermost) frame selected:"),
1097 /* For MI, we should probably have a notification about
1098 current frame change. But this error is not very
1099 likely, so don't bother for now. */
1100 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1104 struct current_thread_cleanup
1106 ptid_t inferior_ptid
;
1107 struct frame_id selected_frame_id
;
1108 int selected_frame_level
;
1115 do_restore_current_thread_cleanup (void *arg
)
1117 struct thread_info
*tp
;
1118 struct current_thread_cleanup
*old
= arg
;
1120 tp
= find_thread_ptid (old
->inferior_ptid
);
1122 /* If the previously selected thread belonged to a process that has
1123 in the mean time been deleted (due to normal exit, detach, etc.),
1124 then don't revert back to it, but instead simply drop back to no
1127 && find_inferior_pid (ptid_get_pid (tp
->ptid
)) != NULL
)
1128 restore_current_thread (old
->inferior_ptid
);
1131 restore_current_thread (null_ptid
);
1132 set_current_inferior (find_inferior_id (old
->inf_id
));
1135 /* The running state of the originally selected thread may have
1136 changed, so we have to recheck it here. */
1137 if (!ptid_equal (inferior_ptid
, null_ptid
)
1139 && is_stopped (inferior_ptid
)
1140 && target_has_registers
1142 && target_has_memory
)
1143 restore_selected_frame (old
->selected_frame_id
,
1144 old
->selected_frame_level
);
1148 restore_current_thread_cleanup_dtor (void *arg
)
1150 struct current_thread_cleanup
*old
= arg
;
1151 struct thread_info
*tp
;
1152 struct inferior
*inf
;
1154 tp
= find_thread_ptid (old
->inferior_ptid
);
1157 inf
= find_inferior_id (old
->inf_id
);
1159 inf
->removable
= old
->was_removable
;
1163 /* Set the thread reference count. */
1166 set_thread_refcount (void *data
)
1169 struct thread_array_cleanup
*ta_cleanup
= data
;
1171 for (k
= 0; k
!= ta_cleanup
->count
; k
++)
1172 ta_cleanup
->tp_array
[k
]->refcount
--;
1176 make_cleanup_restore_current_thread (void)
1178 struct thread_info
*tp
;
1179 struct frame_info
*frame
;
1180 struct current_thread_cleanup
*old
;
1182 old
= xmalloc (sizeof (struct current_thread_cleanup
));
1183 old
->inferior_ptid
= inferior_ptid
;
1184 old
->inf_id
= current_inferior ()->num
;
1185 old
->was_removable
= current_inferior ()->removable
;
1187 if (!ptid_equal (inferior_ptid
, null_ptid
))
1189 old
->was_stopped
= is_stopped (inferior_ptid
);
1190 if (old
->was_stopped
1191 && target_has_registers
1193 && target_has_memory
)
1195 /* When processing internal events, there might not be a
1196 selected frame. If we naively call get_selected_frame
1197 here, then we can end up reading debuginfo for the
1198 current frame, but we don't generally need the debuginfo
1200 frame
= get_selected_frame_if_set ();
1205 old
->selected_frame_id
= get_frame_id (frame
);
1206 old
->selected_frame_level
= frame_relative_level (frame
);
1208 tp
= find_thread_ptid (inferior_ptid
);
1213 current_inferior ()->removable
= 0;
1215 return make_cleanup_dtor (do_restore_current_thread_cleanup
, old
,
1216 restore_current_thread_cleanup_dtor
);
1219 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1220 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1221 of two numbers seperated by a hyphen. Examples:
1223 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1224 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1225 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1228 thread_apply_all_command (char *cmd
, int from_tty
)
1230 struct cleanup
*old_chain
;
1233 struct thread_array_cleanup ta_cleanup
;
1235 if (cmd
== NULL
|| *cmd
== '\000')
1236 error (_("Please specify a command following the thread ID list"));
1238 update_thread_list ();
1240 old_chain
= make_cleanup_restore_current_thread ();
1242 /* Save a copy of the command in case it is clobbered by
1244 saved_cmd
= xstrdup (cmd
);
1245 make_cleanup (xfree
, saved_cmd
);
1246 tc
= thread_count ();
1250 struct thread_info
**tp_array
;
1251 struct thread_info
*tp
;
1254 /* Save a copy of the thread_list in case we execute detach
1256 tp_array
= xmalloc (sizeof (struct thread_info
*) * tc
);
1257 make_cleanup (xfree
, tp_array
);
1258 ta_cleanup
.tp_array
= tp_array
;
1259 ta_cleanup
.count
= tc
;
1261 ALL_NON_EXITED_THREADS (tp
)
1268 make_cleanup (set_thread_refcount
, &ta_cleanup
);
1270 for (k
= 0; k
!= i
; k
++)
1271 if (thread_alive (tp_array
[k
]))
1273 switch_to_thread (tp_array
[k
]->ptid
);
1274 printf_filtered (_("\nThread %d (%s):\n"),
1276 target_pid_to_str (inferior_ptid
));
1277 execute_command (cmd
, from_tty
);
1279 /* Restore exact command used previously. */
1280 strcpy (cmd
, saved_cmd
);
1284 do_cleanups (old_chain
);
1288 thread_apply_command (char *tidlist
, int from_tty
)
1291 struct cleanup
*old_chain
;
1293 struct get_number_or_range_state state
;
1295 if (tidlist
== NULL
|| *tidlist
== '\000')
1296 error (_("Please specify a thread ID list"));
1298 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
1301 error (_("Please specify a command following the thread ID list"));
1303 /* Save a copy of the command in case it is clobbered by
1305 saved_cmd
= xstrdup (cmd
);
1306 old_chain
= make_cleanup (xfree
, saved_cmd
);
1308 init_number_or_range (&state
, tidlist
);
1309 while (!state
.finished
&& state
.string
< cmd
)
1311 struct thread_info
*tp
;
1314 start
= get_number_or_range (&state
);
1316 make_cleanup_restore_current_thread ();
1318 tp
= find_thread_id (start
);
1321 warning (_("Unknown thread %d."), start
);
1322 else if (!thread_alive (tp
))
1323 warning (_("Thread %d has terminated."), start
);
1326 switch_to_thread (tp
->ptid
);
1328 printf_filtered (_("\nThread %d (%s):\n"), tp
->num
,
1329 target_pid_to_str (inferior_ptid
));
1330 execute_command (cmd
, from_tty
);
1332 /* Restore exact command used previously. */
1333 strcpy (cmd
, saved_cmd
);
1337 do_cleanups (old_chain
);
1340 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1341 if prefix of arg is `apply'. */
1344 thread_command (char *tidstr
, int from_tty
)
1348 if (ptid_equal (inferior_ptid
, null_ptid
))
1349 error (_("No thread selected"));
1351 if (target_has_stack
)
1353 if (is_exited (inferior_ptid
))
1354 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1355 pid_to_thread_id (inferior_ptid
),
1356 target_pid_to_str (inferior_ptid
));
1358 printf_filtered (_("[Current thread is %d (%s)]\n"),
1359 pid_to_thread_id (inferior_ptid
),
1360 target_pid_to_str (inferior_ptid
));
1363 error (_("No stack."));
1367 gdb_thread_select (current_uiout
, tidstr
, NULL
);
1370 /* Implementation of `thread name'. */
1373 thread_name_command (char *arg
, int from_tty
)
1375 struct thread_info
*info
;
1377 if (ptid_equal (inferior_ptid
, null_ptid
))
1378 error (_("No thread selected"));
1380 arg
= skip_spaces (arg
);
1382 info
= inferior_thread ();
1384 info
->name
= arg
? xstrdup (arg
) : NULL
;
1387 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1390 thread_find_command (char *arg
, int from_tty
)
1392 struct thread_info
*tp
;
1394 unsigned long match
= 0;
1396 if (arg
== NULL
|| *arg
== '\0')
1397 error (_("Command requires an argument."));
1399 tmp
= re_comp (arg
);
1401 error (_("Invalid regexp (%s): %s"), tmp
, arg
);
1403 update_thread_list ();
1404 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1406 if (tp
->name
!= NULL
&& re_exec (tp
->name
))
1408 printf_filtered (_("Thread %d has name '%s'\n"),
1413 tmp
= target_thread_name (tp
);
1414 if (tmp
!= NULL
&& re_exec (tmp
))
1416 printf_filtered (_("Thread %d has target name '%s'\n"),
1421 tmp
= target_pid_to_str (tp
->ptid
);
1422 if (tmp
!= NULL
&& re_exec (tmp
))
1424 printf_filtered (_("Thread %d has target id '%s'\n"),
1429 tmp
= target_extra_thread_info (tp
);
1430 if (tmp
!= NULL
&& re_exec (tmp
))
1432 printf_filtered (_("Thread %d has extra info '%s'\n"),
1438 printf_filtered (_("No threads match '%s'\n"), arg
);
1441 /* Print notices when new threads are attached and detached. */
1442 int print_thread_events
= 1;
1444 show_print_thread_events (struct ui_file
*file
, int from_tty
,
1445 struct cmd_list_element
*c
, const char *value
)
1447 fprintf_filtered (file
,
1448 _("Printing of thread events is %s.\n"),
1453 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
1456 struct thread_info
*tp
;
1458 num
= value_as_long (parse_and_eval (tidstr
));
1460 tp
= find_thread_id (num
);
1463 error (_("Thread ID %d not known."), num
);
1465 if (!thread_alive (tp
))
1466 error (_("Thread ID %d has terminated."), num
);
1468 switch_to_thread (tp
->ptid
);
1470 annotate_thread_changed ();
1472 ui_out_text (uiout
, "[Switching to thread ");
1473 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
1474 ui_out_text (uiout
, " (");
1475 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
1476 ui_out_text (uiout
, ")]");
1478 /* Note that we can't reach this with an exited thread, due to the
1479 thread_alive check above. */
1480 if (tp
->state
== THREAD_RUNNING
)
1481 ui_out_text (uiout
, "(running)\n");
1484 ui_out_text (uiout
, "\n");
1485 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1488 /* Since the current thread may have changed, see if there is any
1489 exited thread we can now delete. */
1496 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
, char **error_message
)
1498 if (catch_exceptions_with_msg (uiout
, do_captured_thread_select
, tidstr
,
1499 error_message
, RETURN_MASK_ALL
) < 0)
1505 update_thread_list (void)
1508 target_find_new_threads ();
1511 /* Return a new value for the selected thread's id. Return a value of 0 if
1512 no thread is selected, or no threads exist. */
1514 static struct value
*
1515 thread_id_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
1518 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
1520 return value_from_longest (builtin_type (gdbarch
)->builtin_int
,
1521 (tp
? tp
->num
: 0));
1524 /* Commands with a prefix of `thread'. */
1525 struct cmd_list_element
*thread_cmd_list
= NULL
;
1527 /* Implementation of `thread' variable. */
1529 static const struct internalvar_funcs thread_funcs
=
1531 thread_id_make_value
,
1537 _initialize_thread (void)
1539 static struct cmd_list_element
*thread_apply_list
= NULL
;
1541 add_info ("threads", info_threads_command
,
1542 _("Display currently known threads.\n\
1543 Usage: info threads [ID]...\n\
1544 Optional arguments are thread IDs with spaces between.\n\
1545 If no arguments, all threads are displayed."));
1547 add_prefix_cmd ("thread", class_run
, thread_command
, _("\
1548 Use this command to switch between threads.\n\
1549 The new thread ID must be currently known."),
1550 &thread_cmd_list
, "thread ", 1, &cmdlist
);
1552 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
1553 _("Apply a command to a list of threads."),
1554 &thread_apply_list
, "thread apply ", 1, &thread_cmd_list
);
1556 add_cmd ("all", class_run
, thread_apply_all_command
,
1557 _("Apply a command to all threads."), &thread_apply_list
);
1559 add_cmd ("name", class_run
, thread_name_command
,
1560 _("Set the current thread's name.\n\
1561 Usage: thread name [NAME]\n\
1562 If NAME is not given, then any existing name is removed."), &thread_cmd_list
);
1564 add_cmd ("find", class_run
, thread_find_command
, _("\
1565 Find threads that match a regular expression.\n\
1566 Usage: thread find REGEXP\n\
1567 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1571 add_com_alias ("t", "thread", class_run
, 1);
1573 add_setshow_boolean_cmd ("thread-events", no_class
,
1574 &print_thread_events
, _("\
1575 Set printing of thread events (such as thread start and exit)."), _("\
1576 Show printing of thread events (such as thread start and exit)."), NULL
,
1578 show_print_thread_events
,
1579 &setprintlist
, &showprintlist
);
1581 create_internalvar_type_lazy ("_thread", &thread_funcs
, NULL
);