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"
37 #include <sys/types.h>
42 #include "cli/cli-decode.h"
43 #include "gdb_regex.h"
44 #include "cli/cli-utils.h"
45 #include "continuations.h"
47 /* Definition of struct thread_info exported to gdbthread.h. */
49 /* Prototypes for exported functions. */
51 void _initialize_thread (void);
53 /* Prototypes for local functions. */
55 struct thread_info
*thread_list
= NULL
;
56 static int highest_thread_num
;
58 /* True if any thread is, or may be executing. We need to track this
59 separately because until we fully sync the thread list, we won't
60 know whether the target is fully stopped, even if we see stop
61 events for all known threads, because any of those threads may have
62 spawned new threads we haven't heard of yet. */
63 static int threads_executing
;
65 static void thread_command (char *tidstr
, int from_tty
);
66 static void thread_apply_all_command (char *, int);
67 static int thread_alive (struct thread_info
*);
68 static void info_threads_command (char *, int);
69 static void thread_apply_command (char *, int);
70 static void restore_current_thread (ptid_t
);
71 static void prune_threads (void);
73 /* Data to cleanup thread array. */
75 struct thread_array_cleanup
77 /* Array of thread pointers used to set
79 struct thread_info
**tp_array
;
81 /* Thread count in the array. */
87 inferior_thread (void)
89 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
94 /* Delete the breakpoint pointed at by BP_P, if there's one. */
97 delete_thread_breakpoint (struct breakpoint
**bp_p
)
101 delete_breakpoint (*bp_p
);
107 delete_step_resume_breakpoint (struct thread_info
*tp
)
110 delete_thread_breakpoint (&tp
->control
.step_resume_breakpoint
);
114 delete_exception_resume_breakpoint (struct thread_info
*tp
)
117 delete_thread_breakpoint (&tp
->control
.exception_resume_breakpoint
);
120 /* See gdbthread.h. */
123 delete_single_step_breakpoints (struct thread_info
*tp
)
126 delete_thread_breakpoint (&tp
->control
.single_step_breakpoints
);
129 /* Delete the breakpoint pointed at by BP_P at the next stop, if
133 delete_at_next_stop (struct breakpoint
**bp
)
137 (*bp
)->disposition
= disp_del_at_next_stop
;
142 /* See gdbthread.h. */
145 thread_has_single_step_breakpoints_set (struct thread_info
*tp
)
147 return tp
->control
.single_step_breakpoints
!= NULL
;
150 /* See gdbthread.h. */
153 thread_has_single_step_breakpoint_here (struct thread_info
*tp
,
154 struct address_space
*aspace
,
157 struct breakpoint
*ss_bps
= tp
->control
.single_step_breakpoints
;
159 return (ss_bps
!= NULL
160 && breakpoint_has_location_inserted_here (ss_bps
, aspace
, addr
));
164 clear_thread_inferior_resources (struct thread_info
*tp
)
166 /* NOTE: this will take care of any left-over step_resume breakpoints,
167 but not any user-specified thread-specific breakpoints. We can not
168 delete the breakpoint straight-off, because the inferior might not
169 be stopped at the moment. */
170 delete_at_next_stop (&tp
->control
.step_resume_breakpoint
);
171 delete_at_next_stop (&tp
->control
.exception_resume_breakpoint
);
172 delete_at_next_stop (&tp
->control
.single_step_breakpoints
);
174 delete_longjmp_breakpoint_at_next_stop (tp
->num
);
176 bpstat_clear (&tp
->control
.stop_bpstat
);
178 btrace_teardown (tp
);
180 do_all_intermediate_continuations_thread (tp
, 1);
181 do_all_continuations_thread (tp
, 1);
185 free_thread (struct thread_info
*tp
)
189 if (tp
->private_dtor
)
190 tp
->private_dtor (tp
->private);
200 init_thread_list (void)
202 struct thread_info
*tp
, *tpnext
;
204 highest_thread_num
= 0;
209 for (tp
= thread_list
; tp
; tp
= tpnext
)
216 threads_executing
= 0;
219 /* Allocate a new thread with target id PTID and add it to the thread
222 static struct thread_info
*
223 new_thread (ptid_t ptid
)
225 struct thread_info
*tp
;
227 tp
= xcalloc (1, sizeof (*tp
));
230 tp
->num
= ++highest_thread_num
;
231 tp
->next
= thread_list
;
234 /* Nothing to follow yet. */
235 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
236 tp
->state
= THREAD_STOPPED
;
242 add_thread_silent (ptid_t ptid
)
244 struct thread_info
*tp
;
246 tp
= find_thread_ptid (ptid
);
248 /* Found an old thread with the same id. It has to be dead,
249 otherwise we wouldn't be adding a new thread with the same id.
250 The OS is reusing this id --- delete it, and recreate a new
253 /* In addition to deleting the thread, if this is the current
254 thread, then we need to take care that delete_thread doesn't
255 really delete the thread if it is inferior_ptid. Create a
256 new template thread in the list with an invalid ptid, switch
257 to it, delete the original thread, reset the new thread's
258 ptid, and switch to it. */
260 if (ptid_equal (inferior_ptid
, ptid
))
262 tp
= new_thread (null_ptid
);
264 /* Make switch_to_thread not read from the thread. */
265 tp
->state
= THREAD_EXITED
;
266 switch_to_thread (null_ptid
);
268 /* Now we can delete it. */
269 delete_thread (ptid
);
271 /* Now reset its ptid, and reswitch inferior_ptid to it. */
273 tp
->state
= THREAD_STOPPED
;
274 switch_to_thread (ptid
);
276 observer_notify_new_thread (tp
);
282 /* Just go ahead and delete it. */
283 delete_thread (ptid
);
286 tp
= new_thread (ptid
);
287 observer_notify_new_thread (tp
);
293 add_thread_with_info (ptid_t ptid
, struct private_thread_info
*private)
295 struct thread_info
*result
= add_thread_silent (ptid
);
297 result
->private = private;
299 if (print_thread_events
)
300 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid
));
302 annotate_new_thread ();
307 add_thread (ptid_t ptid
)
309 return add_thread_with_info (ptid
, NULL
);
312 /* Delete thread PTID. If SILENT, don't notify the observer of this
315 delete_thread_1 (ptid_t ptid
, int silent
)
317 struct thread_info
*tp
, *tpprev
;
321 for (tp
= thread_list
; tp
; tpprev
= tp
, tp
= tp
->next
)
322 if (ptid_equal (tp
->ptid
, ptid
))
328 /* If this is the current thread, or there's code out there that
329 relies on it existing (refcount > 0) we can't delete yet. Mark
330 it as exited, and notify it. */
332 || ptid_equal (tp
->ptid
, inferior_ptid
))
334 if (tp
->state
!= THREAD_EXITED
)
336 observer_notify_thread_exit (tp
, silent
);
338 /* Tag it as exited. */
339 tp
->state
= THREAD_EXITED
;
341 /* Clear breakpoints, etc. associated with this thread. */
342 clear_thread_inferior_resources (tp
);
345 /* Will be really deleted some other time. */
349 /* Notify thread exit, but only if we haven't already. */
350 if (tp
->state
!= THREAD_EXITED
)
351 observer_notify_thread_exit (tp
, silent
);
353 /* Tag it as exited. */
354 tp
->state
= THREAD_EXITED
;
355 clear_thread_inferior_resources (tp
);
358 tpprev
->next
= tp
->next
;
360 thread_list
= tp
->next
;
365 /* Delete thread PTID and notify of thread exit. If this is
366 inferior_ptid, don't actually delete it, but tag it as exited and
367 do the notification. If PTID is the user selected thread, clear
370 delete_thread (ptid_t ptid
)
372 delete_thread_1 (ptid
, 0 /* not silent */);
376 delete_thread_silent (ptid_t ptid
)
378 delete_thread_1 (ptid
, 1 /* silent */);
382 find_thread_id (int num
)
384 struct thread_info
*tp
;
386 for (tp
= thread_list
; tp
; tp
= tp
->next
)
393 /* Find a thread_info by matching PTID. */
395 find_thread_ptid (ptid_t ptid
)
397 struct thread_info
*tp
;
399 for (tp
= thread_list
; tp
; tp
= tp
->next
)
400 if (ptid_equal (tp
->ptid
, ptid
))
407 * Thread iterator function.
409 * Calls a callback function once for each thread, so long as
410 * the callback function returns false. If the callback function
411 * returns true, the iteration will end and the current thread
412 * will be returned. This can be useful for implementing a
413 * search for a thread with arbitrary attributes, or for applying
414 * some operation to every thread.
416 * FIXME: some of the existing functionality, such as
417 * "Thread apply all", might be rewritten using this functionality.
421 iterate_over_threads (int (*callback
) (struct thread_info
*, void *),
424 struct thread_info
*tp
, *next
;
426 for (tp
= thread_list
; tp
; tp
= next
)
429 if ((*callback
) (tp
, data
))
440 struct thread_info
*tp
;
442 for (tp
= thread_list
; tp
; tp
= tp
->next
)
449 valid_thread_id (int num
)
451 struct thread_info
*tp
;
453 for (tp
= thread_list
; tp
; tp
= tp
->next
)
461 pid_to_thread_id (ptid_t ptid
)
463 struct thread_info
*tp
;
465 for (tp
= thread_list
; tp
; tp
= tp
->next
)
466 if (ptid_equal (tp
->ptid
, ptid
))
473 thread_id_to_pid (int num
)
475 struct thread_info
*thread
= find_thread_id (num
);
480 return pid_to_ptid (-1);
484 in_thread_list (ptid_t ptid
)
486 struct thread_info
*tp
;
488 for (tp
= thread_list
; tp
; tp
= tp
->next
)
489 if (ptid_equal (tp
->ptid
, ptid
))
492 return 0; /* Never heard of 'im. */
495 /* Finds the first thread of the inferior given by PID. If PID is -1,
496 return the first thread in the list. */
499 first_thread_of_process (int pid
)
501 struct thread_info
*tp
, *ret
= NULL
;
503 for (tp
= thread_list
; tp
; tp
= tp
->next
)
504 if (pid
== -1 || ptid_get_pid (tp
->ptid
) == pid
)
505 if (ret
== NULL
|| tp
->num
< ret
->num
)
512 any_thread_of_process (int pid
)
514 struct thread_info
*tp
;
516 gdb_assert (pid
!= 0);
518 /* Prefer the current thread. */
519 if (ptid_get_pid (inferior_ptid
) == pid
)
520 return inferior_thread ();
522 ALL_NON_EXITED_THREADS (tp
)
523 if (ptid_get_pid (tp
->ptid
) == pid
)
530 any_live_thread_of_process (int pid
)
532 struct thread_info
*curr_tp
= NULL
;
533 struct thread_info
*tp
;
534 struct thread_info
*tp_executing
= NULL
;
536 gdb_assert (pid
!= 0);
538 /* Prefer the current thread if it's not executing. */
539 if (ptid_get_pid (inferior_ptid
) == pid
)
541 /* If the current thread is dead, forget it. If it's not
542 executing, use it. Otherwise, still choose it (below), but
543 only if no other non-executing thread is found. */
544 curr_tp
= inferior_thread ();
545 if (curr_tp
->state
== THREAD_EXITED
)
547 else if (!curr_tp
->executing
)
551 ALL_NON_EXITED_THREADS (tp
)
552 if (ptid_get_pid (tp
->ptid
) == pid
)
560 /* If both the current thread and all live threads are executing,
561 prefer the current thread. */
565 /* Otherwise, just return an executing thread, if any. */
569 /* Print a list of thread ids currently known, and the total number of
570 threads. To be used from within catch_errors. */
572 do_captured_list_thread_ids (struct ui_out
*uiout
, void *arg
)
574 struct thread_info
*tp
;
576 struct cleanup
*cleanup_chain
;
577 int current_thread
= -1;
579 update_thread_list ();
581 cleanup_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "thread-ids");
583 for (tp
= thread_list
; tp
; tp
= tp
->next
)
585 if (tp
->state
== THREAD_EXITED
)
588 if (ptid_equal (tp
->ptid
, inferior_ptid
))
589 current_thread
= tp
->num
;
592 ui_out_field_int (uiout
, "thread-id", tp
->num
);
595 do_cleanups (cleanup_chain
);
597 if (current_thread
!= -1)
598 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
599 ui_out_field_int (uiout
, "number-of-threads", num
);
603 /* Official gdblib interface function to get a list of thread ids and
606 gdb_list_thread_ids (struct ui_out
*uiout
, char **error_message
)
608 if (catch_exceptions_with_msg (uiout
, do_captured_list_thread_ids
, NULL
,
609 error_message
, RETURN_MASK_ALL
) < 0)
614 /* Return true if TP is an active thread. */
616 thread_alive (struct thread_info
*tp
)
618 if (tp
->state
== THREAD_EXITED
)
620 if (!target_thread_alive (tp
->ptid
))
628 struct thread_info
*tp
, *next
;
630 for (tp
= thread_list
; tp
; tp
= next
)
633 if (!thread_alive (tp
))
634 delete_thread (tp
->ptid
);
639 thread_change_ptid (ptid_t old_ptid
, ptid_t new_ptid
)
641 struct inferior
*inf
;
642 struct thread_info
*tp
;
644 /* It can happen that what we knew as the target inferior id
645 changes. E.g, target remote may only discover the remote process
646 pid after adding the inferior to GDB's list. */
647 inf
= find_inferior_pid (ptid_get_pid (old_ptid
));
648 inf
->pid
= ptid_get_pid (new_ptid
);
650 tp
= find_thread_ptid (old_ptid
);
653 observer_notify_thread_ptid_changed (old_ptid
, new_ptid
);
657 set_running (ptid_t ptid
, int running
)
659 struct thread_info
*tp
;
660 int all
= ptid_equal (ptid
, minus_one_ptid
);
662 /* We try not to notify the observer if no thread has actually changed
663 the running state -- merely to reduce the number of messages to
664 frontend. Frontend is supposed to handle multiple *running just fine. */
665 if (all
|| ptid_is_pid (ptid
))
669 for (tp
= thread_list
; tp
; tp
= tp
->next
)
670 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
672 if (tp
->state
== THREAD_EXITED
)
674 if (running
&& tp
->state
== THREAD_STOPPED
)
676 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
679 observer_notify_target_resumed (ptid
);
685 tp
= find_thread_ptid (ptid
);
687 gdb_assert (tp
->state
!= THREAD_EXITED
);
688 if (running
&& tp
->state
== THREAD_STOPPED
)
690 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
692 observer_notify_target_resumed (ptid
);
697 is_thread_state (ptid_t ptid
, enum thread_state state
)
699 struct thread_info
*tp
;
701 tp
= find_thread_ptid (ptid
);
703 return tp
->state
== state
;
707 is_stopped (ptid_t ptid
)
709 return is_thread_state (ptid
, THREAD_STOPPED
);
713 is_exited (ptid_t ptid
)
715 return is_thread_state (ptid
, THREAD_EXITED
);
719 is_running (ptid_t ptid
)
721 return is_thread_state (ptid
, THREAD_RUNNING
);
725 is_executing (ptid_t ptid
)
727 struct thread_info
*tp
;
729 tp
= find_thread_ptid (ptid
);
731 return tp
->executing
;
735 set_executing (ptid_t ptid
, int executing
)
737 struct thread_info
*tp
;
738 int all
= ptid_equal (ptid
, minus_one_ptid
);
740 if (all
|| ptid_is_pid (ptid
))
742 for (tp
= thread_list
; tp
; tp
= tp
->next
)
743 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
744 tp
->executing
= executing
;
748 tp
= find_thread_ptid (ptid
);
750 tp
->executing
= executing
;
753 /* It only takes one running thread to spawn more threads.*/
755 threads_executing
= 1;
756 /* Only clear the flag if the caller is telling us everything is
758 else if (ptid_equal (minus_one_ptid
, ptid
))
759 threads_executing
= 0;
762 /* See gdbthread.h. */
765 threads_are_executing (void)
767 return threads_executing
;
771 set_stop_requested (ptid_t ptid
, int stop
)
773 struct thread_info
*tp
;
774 int all
= ptid_equal (ptid
, minus_one_ptid
);
776 if (all
|| ptid_is_pid (ptid
))
778 for (tp
= thread_list
; tp
; tp
= tp
->next
)
779 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
780 tp
->stop_requested
= stop
;
784 tp
= find_thread_ptid (ptid
);
786 tp
->stop_requested
= stop
;
789 /* Call the stop requested observer so other components of GDB can
790 react to this request. */
792 observer_notify_thread_stop_requested (ptid
);
796 finish_thread_state (ptid_t ptid
)
798 struct thread_info
*tp
;
802 all
= ptid_equal (ptid
, minus_one_ptid
);
804 if (all
|| ptid_is_pid (ptid
))
806 for (tp
= thread_list
; tp
; tp
= tp
->next
)
808 if (tp
->state
== THREAD_EXITED
)
810 if (all
|| ptid_get_pid (ptid
) == ptid_get_pid (tp
->ptid
))
812 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
814 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
820 tp
= find_thread_ptid (ptid
);
822 if (tp
->state
!= THREAD_EXITED
)
824 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
826 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
831 observer_notify_target_resumed (ptid
);
835 finish_thread_state_cleanup (void *arg
)
837 ptid_t
*ptid_p
= arg
;
841 finish_thread_state (*ptid_p
);
845 pc_in_thread_step_range (CORE_ADDR pc
, struct thread_info
*thread
)
847 return (pc
>= thread
->control
.step_range_start
848 && pc
< thread
->control
.step_range_end
);
851 /* Prints the list of threads and their details on UIOUT.
852 This is a version of 'info_threads_command' suitable for
854 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
855 that should be printed. Otherwise, all threads are
857 If PID is not -1, only print threads from the process PID.
858 Otherwise, threads from all attached PIDs are printed.
859 If both REQUESTED_THREAD and PID are not -1, then the thread
860 is printed if it belongs to the specified process. Otherwise,
861 an error is raised. */
863 print_thread_info (struct ui_out
*uiout
, char *requested_threads
, int pid
)
865 struct thread_info
*tp
;
867 struct cleanup
*old_chain
;
868 char *extra_info
, *name
, *target_id
;
869 int current_thread
= -1;
871 update_thread_list ();
872 current_ptid
= inferior_ptid
;
874 /* We'll be switching threads temporarily. */
875 old_chain
= make_cleanup_restore_current_thread ();
877 /* For backward compatibility, we make a list for MI. A table is
878 preferable for the CLI, though, because it shows table
880 if (ui_out_is_mi_like_p (uiout
))
881 make_cleanup_ui_out_list_begin_end (uiout
, "threads");
886 for (tp
= thread_list
; tp
; tp
= tp
->next
)
888 if (!number_is_in_list (requested_threads
, tp
->num
))
891 if (pid
!= -1 && ptid_get_pid (tp
->ptid
) != pid
)
894 if (tp
->state
== THREAD_EXITED
)
902 if (requested_threads
== NULL
|| *requested_threads
== '\0')
903 ui_out_message (uiout
, 0, _("No threads.\n"));
905 ui_out_message (uiout
, 0, _("No threads match '%s'.\n"),
907 do_cleanups (old_chain
);
911 make_cleanup_ui_out_table_begin_end (uiout
, 4, n_threads
, "threads");
913 ui_out_table_header (uiout
, 1, ui_left
, "current", "");
914 ui_out_table_header (uiout
, 4, ui_left
, "id", "Id");
915 ui_out_table_header (uiout
, 17, ui_left
, "target-id", "Target Id");
916 ui_out_table_header (uiout
, 1, ui_left
, "frame", "Frame");
917 ui_out_table_body (uiout
);
920 for (tp
= thread_list
; tp
; tp
= tp
->next
)
922 struct cleanup
*chain2
;
925 if (!number_is_in_list (requested_threads
, tp
->num
))
928 if (pid
!= -1 && ptid_get_pid (tp
->ptid
) != pid
)
930 if (requested_threads
!= NULL
&& *requested_threads
!= '\0')
931 error (_("Requested thread not found in requested process"));
935 if (ptid_equal (tp
->ptid
, current_ptid
))
936 current_thread
= tp
->num
;
938 if (tp
->state
== THREAD_EXITED
)
941 chain2
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
943 if (ui_out_is_mi_like_p (uiout
))
946 if (ptid_equal (tp
->ptid
, current_ptid
))
947 ui_out_text (uiout
, "* ");
949 ui_out_text (uiout
, " ");
953 if (ptid_equal (tp
->ptid
, current_ptid
))
954 ui_out_field_string (uiout
, "current", "*");
956 ui_out_field_skip (uiout
, "current");
959 ui_out_field_int (uiout
, "id", tp
->num
);
961 /* For the CLI, we stuff everything into the target-id field.
962 This is a gross hack to make the output come out looking
963 correct. The underlying problem here is that ui-out has no
964 way to specify that a field's space allocation should be
965 shared by several fields. For MI, we do the right thing
968 target_id
= target_pid_to_str (tp
->ptid
);
969 extra_info
= target_extra_thread_info (tp
);
970 name
= tp
->name
? tp
->name
: target_thread_name (tp
);
972 if (ui_out_is_mi_like_p (uiout
))
974 ui_out_field_string (uiout
, "target-id", target_id
);
976 ui_out_field_string (uiout
, "details", extra_info
);
978 ui_out_field_string (uiout
, "name", name
);
982 struct cleanup
*str_cleanup
;
985 if (extra_info
&& name
)
986 contents
= xstrprintf ("%s \"%s\" (%s)", target_id
,
989 contents
= xstrprintf ("%s (%s)", target_id
, extra_info
);
991 contents
= xstrprintf ("%s \"%s\"", target_id
, name
);
993 contents
= xstrdup (target_id
);
994 str_cleanup
= make_cleanup (xfree
, contents
);
996 ui_out_field_string (uiout
, "target-id", contents
);
997 do_cleanups (str_cleanup
);
1000 if (tp
->state
== THREAD_RUNNING
)
1001 ui_out_text (uiout
, "(running)\n");
1004 /* The switch below puts us at the top of the stack (leaf
1006 switch_to_thread (tp
->ptid
);
1007 print_stack_frame (get_selected_frame (NULL
),
1008 /* For MI output, print frame level. */
1009 ui_out_is_mi_like_p (uiout
),
1013 if (ui_out_is_mi_like_p (uiout
))
1015 char *state
= "stopped";
1017 if (tp
->state
== THREAD_RUNNING
)
1019 ui_out_field_string (uiout
, "state", state
);
1022 core
= target_core_of_thread (tp
->ptid
);
1023 if (ui_out_is_mi_like_p (uiout
) && core
!= -1)
1024 ui_out_field_int (uiout
, "core", core
);
1026 do_cleanups (chain2
);
1029 /* Restores the current thread and the frame selected before
1030 the "info threads" command. */
1031 do_cleanups (old_chain
);
1033 if (pid
== -1 && requested_threads
== NULL
)
1035 gdb_assert (current_thread
!= -1
1037 || ptid_equal (inferior_ptid
, null_ptid
));
1038 if (current_thread
!= -1 && ui_out_is_mi_like_p (uiout
))
1039 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
1041 if (current_thread
!= -1 && is_exited (current_ptid
))
1042 ui_out_message (uiout
, 0, "\n\
1043 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
1045 else if (thread_list
1046 && current_thread
== -1
1047 && ptid_equal (current_ptid
, null_ptid
))
1048 ui_out_message (uiout
, 0, "\n\
1049 No selected thread. See `help thread'.\n");
1053 /* Print information about currently known threads
1055 Optional ARG is a thread id, or list of thread ids.
1057 Note: this has the drawback that it _really_ switches
1058 threads, which frees the frame cache. A no-side
1059 effects info-threads command would be nicer. */
1062 info_threads_command (char *arg
, int from_tty
)
1064 print_thread_info (current_uiout
, arg
, -1);
1067 /* Switch from one thread to another. */
1070 switch_to_thread (ptid_t ptid
)
1072 /* Switch the program space as well, if we can infer it from the now
1073 current thread. Otherwise, it's up to the caller to select the
1075 if (!ptid_equal (ptid
, null_ptid
))
1077 struct inferior
*inf
;
1079 inf
= find_inferior_pid (ptid_get_pid (ptid
));
1080 gdb_assert (inf
!= NULL
);
1081 set_current_program_space (inf
->pspace
);
1082 set_current_inferior (inf
);
1085 if (ptid_equal (ptid
, inferior_ptid
))
1088 inferior_ptid
= ptid
;
1089 reinit_frame_cache ();
1091 /* We don't check for is_stopped, because we're called at times
1092 while in the TARGET_RUNNING state, e.g., while handling an
1094 if (!ptid_equal (inferior_ptid
, null_ptid
)
1095 && !is_exited (ptid
)
1096 && !is_executing (ptid
))
1097 stop_pc
= regcache_read_pc (get_thread_regcache (ptid
));
1099 stop_pc
= ~(CORE_ADDR
) 0;
1103 restore_current_thread (ptid_t ptid
)
1105 switch_to_thread (ptid
);
1109 restore_selected_frame (struct frame_id a_frame_id
, int frame_level
)
1111 struct frame_info
*frame
= NULL
;
1114 /* This means there was no selected frame. */
1115 if (frame_level
== -1)
1117 select_frame (NULL
);
1121 gdb_assert (frame_level
>= 0);
1123 /* Restore by level first, check if the frame id is the same as
1124 expected. If that fails, try restoring by frame id. If that
1125 fails, nothing to do, just warn the user. */
1127 count
= frame_level
;
1128 frame
= find_relative_frame (get_current_frame (), &count
);
1131 /* The frame ids must match - either both valid or both outer_frame_id.
1132 The latter case is not failsafe, but since it's highly unlikely
1133 the search by level finds the wrong frame, it's 99.9(9)% of
1134 the time (for all practical purposes) safe. */
1135 && frame_id_eq (get_frame_id (frame
), a_frame_id
))
1137 /* Cool, all is fine. */
1138 select_frame (frame
);
1142 frame
= frame_find_by_id (a_frame_id
);
1145 /* Cool, refound it. */
1146 select_frame (frame
);
1150 /* Nothing else to do, the frame layout really changed. Select the
1151 innermost stack frame. */
1152 select_frame (get_current_frame ());
1154 /* Warn the user. */
1155 if (frame_level
> 0 && !ui_out_is_mi_like_p (current_uiout
))
1157 warning (_("Couldn't restore frame #%d in "
1158 "current thread. Bottom (innermost) frame selected:"),
1160 /* For MI, we should probably have a notification about
1161 current frame change. But this error is not very
1162 likely, so don't bother for now. */
1163 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1167 struct current_thread_cleanup
1169 ptid_t inferior_ptid
;
1170 struct frame_id selected_frame_id
;
1171 int selected_frame_level
;
1178 do_restore_current_thread_cleanup (void *arg
)
1180 struct thread_info
*tp
;
1181 struct current_thread_cleanup
*old
= arg
;
1183 tp
= find_thread_ptid (old
->inferior_ptid
);
1185 /* If the previously selected thread belonged to a process that has
1186 in the mean time been deleted (due to normal exit, detach, etc.),
1187 then don't revert back to it, but instead simply drop back to no
1190 && find_inferior_pid (ptid_get_pid (tp
->ptid
)) != NULL
)
1191 restore_current_thread (old
->inferior_ptid
);
1194 restore_current_thread (null_ptid
);
1195 set_current_inferior (find_inferior_id (old
->inf_id
));
1198 /* The running state of the originally selected thread may have
1199 changed, so we have to recheck it here. */
1200 if (!ptid_equal (inferior_ptid
, null_ptid
)
1202 && is_stopped (inferior_ptid
)
1203 && target_has_registers
1205 && target_has_memory
)
1206 restore_selected_frame (old
->selected_frame_id
,
1207 old
->selected_frame_level
);
1211 restore_current_thread_cleanup_dtor (void *arg
)
1213 struct current_thread_cleanup
*old
= arg
;
1214 struct thread_info
*tp
;
1215 struct inferior
*inf
;
1217 tp
= find_thread_ptid (old
->inferior_ptid
);
1220 inf
= find_inferior_id (old
->inf_id
);
1222 inf
->removable
= old
->was_removable
;
1226 /* Set the thread reference count. */
1229 set_thread_refcount (void *data
)
1232 struct thread_array_cleanup
*ta_cleanup
= data
;
1234 for (k
= 0; k
!= ta_cleanup
->count
; k
++)
1235 ta_cleanup
->tp_array
[k
]->refcount
--;
1239 make_cleanup_restore_current_thread (void)
1241 struct thread_info
*tp
;
1242 struct frame_info
*frame
;
1243 struct current_thread_cleanup
*old
;
1245 old
= xmalloc (sizeof (struct current_thread_cleanup
));
1246 old
->inferior_ptid
= inferior_ptid
;
1247 old
->inf_id
= current_inferior ()->num
;
1248 old
->was_removable
= current_inferior ()->removable
;
1250 if (!ptid_equal (inferior_ptid
, null_ptid
))
1252 old
->was_stopped
= is_stopped (inferior_ptid
);
1253 if (old
->was_stopped
1254 && target_has_registers
1256 && target_has_memory
)
1258 /* When processing internal events, there might not be a
1259 selected frame. If we naively call get_selected_frame
1260 here, then we can end up reading debuginfo for the
1261 current frame, but we don't generally need the debuginfo
1263 frame
= get_selected_frame_if_set ();
1268 old
->selected_frame_id
= get_frame_id (frame
);
1269 old
->selected_frame_level
= frame_relative_level (frame
);
1271 tp
= find_thread_ptid (inferior_ptid
);
1276 current_inferior ()->removable
= 0;
1278 return make_cleanup_dtor (do_restore_current_thread_cleanup
, old
,
1279 restore_current_thread_cleanup_dtor
);
1282 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1283 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1284 of two numbers seperated by a hyphen. Examples:
1286 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1287 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1288 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1291 thread_apply_all_command (char *cmd
, int from_tty
)
1293 struct cleanup
*old_chain
;
1296 struct thread_array_cleanup ta_cleanup
;
1298 if (cmd
== NULL
|| *cmd
== '\000')
1299 error (_("Please specify a command following the thread ID list"));
1301 update_thread_list ();
1303 old_chain
= make_cleanup_restore_current_thread ();
1305 /* Save a copy of the command in case it is clobbered by
1307 saved_cmd
= xstrdup (cmd
);
1308 make_cleanup (xfree
, saved_cmd
);
1309 tc
= thread_count ();
1313 struct thread_info
**tp_array
;
1314 struct thread_info
*tp
;
1317 /* Save a copy of the thread_list in case we execute detach
1319 tp_array
= xmalloc (sizeof (struct thread_info
*) * tc
);
1320 make_cleanup (xfree
, tp_array
);
1321 ta_cleanup
.tp_array
= tp_array
;
1322 ta_cleanup
.count
= tc
;
1324 ALL_NON_EXITED_THREADS (tp
)
1331 make_cleanup (set_thread_refcount
, &ta_cleanup
);
1333 for (k
= 0; k
!= i
; k
++)
1334 if (thread_alive (tp_array
[k
]))
1336 switch_to_thread (tp_array
[k
]->ptid
);
1337 printf_filtered (_("\nThread %d (%s):\n"),
1339 target_pid_to_str (inferior_ptid
));
1340 execute_command (cmd
, from_tty
);
1342 /* Restore exact command used previously. */
1343 strcpy (cmd
, saved_cmd
);
1347 do_cleanups (old_chain
);
1351 thread_apply_command (char *tidlist
, int from_tty
)
1354 struct cleanup
*old_chain
;
1356 struct get_number_or_range_state state
;
1358 if (tidlist
== NULL
|| *tidlist
== '\000')
1359 error (_("Please specify a thread ID list"));
1361 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
1364 error (_("Please specify a command following the thread ID list"));
1366 /* Save a copy of the command in case it is clobbered by
1368 saved_cmd
= xstrdup (cmd
);
1369 old_chain
= make_cleanup (xfree
, saved_cmd
);
1371 init_number_or_range (&state
, tidlist
);
1372 while (!state
.finished
&& state
.string
< cmd
)
1374 struct thread_info
*tp
;
1377 start
= get_number_or_range (&state
);
1379 make_cleanup_restore_current_thread ();
1381 tp
= find_thread_id (start
);
1384 warning (_("Unknown thread %d."), start
);
1385 else if (!thread_alive (tp
))
1386 warning (_("Thread %d has terminated."), start
);
1389 switch_to_thread (tp
->ptid
);
1391 printf_filtered (_("\nThread %d (%s):\n"), tp
->num
,
1392 target_pid_to_str (inferior_ptid
));
1393 execute_command (cmd
, from_tty
);
1395 /* Restore exact command used previously. */
1396 strcpy (cmd
, saved_cmd
);
1400 do_cleanups (old_chain
);
1403 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1404 if prefix of arg is `apply'. */
1407 thread_command (char *tidstr
, int from_tty
)
1411 if (ptid_equal (inferior_ptid
, null_ptid
))
1412 error (_("No thread selected"));
1414 if (target_has_stack
)
1416 if (is_exited (inferior_ptid
))
1417 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1418 pid_to_thread_id (inferior_ptid
),
1419 target_pid_to_str (inferior_ptid
));
1421 printf_filtered (_("[Current thread is %d (%s)]\n"),
1422 pid_to_thread_id (inferior_ptid
),
1423 target_pid_to_str (inferior_ptid
));
1426 error (_("No stack."));
1430 gdb_thread_select (current_uiout
, tidstr
, NULL
);
1433 /* Implementation of `thread name'. */
1436 thread_name_command (char *arg
, int from_tty
)
1438 struct thread_info
*info
;
1440 if (ptid_equal (inferior_ptid
, null_ptid
))
1441 error (_("No thread selected"));
1443 arg
= skip_spaces (arg
);
1445 info
= inferior_thread ();
1447 info
->name
= arg
? xstrdup (arg
) : NULL
;
1450 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1453 thread_find_command (char *arg
, int from_tty
)
1455 struct thread_info
*tp
;
1457 unsigned long match
= 0;
1459 if (arg
== NULL
|| *arg
== '\0')
1460 error (_("Command requires an argument."));
1462 tmp
= re_comp (arg
);
1464 error (_("Invalid regexp (%s): %s"), tmp
, arg
);
1466 update_thread_list ();
1467 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1469 if (tp
->name
!= NULL
&& re_exec (tp
->name
))
1471 printf_filtered (_("Thread %d has name '%s'\n"),
1476 tmp
= target_thread_name (tp
);
1477 if (tmp
!= NULL
&& re_exec (tmp
))
1479 printf_filtered (_("Thread %d has target name '%s'\n"),
1484 tmp
= target_pid_to_str (tp
->ptid
);
1485 if (tmp
!= NULL
&& re_exec (tmp
))
1487 printf_filtered (_("Thread %d has target id '%s'\n"),
1492 tmp
= target_extra_thread_info (tp
);
1493 if (tmp
!= NULL
&& re_exec (tmp
))
1495 printf_filtered (_("Thread %d has extra info '%s'\n"),
1501 printf_filtered (_("No threads match '%s'\n"), arg
);
1504 /* Print notices when new threads are attached and detached. */
1505 int print_thread_events
= 1;
1507 show_print_thread_events (struct ui_file
*file
, int from_tty
,
1508 struct cmd_list_element
*c
, const char *value
)
1510 fprintf_filtered (file
,
1511 _("Printing of thread events is %s.\n"),
1516 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
1519 struct thread_info
*tp
;
1521 num
= value_as_long (parse_and_eval (tidstr
));
1523 tp
= find_thread_id (num
);
1526 error (_("Thread ID %d not known."), num
);
1528 if (!thread_alive (tp
))
1529 error (_("Thread ID %d has terminated."), num
);
1531 switch_to_thread (tp
->ptid
);
1533 annotate_thread_changed ();
1535 ui_out_text (uiout
, "[Switching to thread ");
1536 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
1537 ui_out_text (uiout
, " (");
1538 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
1539 ui_out_text (uiout
, ")]");
1541 /* Note that we can't reach this with an exited thread, due to the
1542 thread_alive check above. */
1543 if (tp
->state
== THREAD_RUNNING
)
1544 ui_out_text (uiout
, "(running)\n");
1547 ui_out_text (uiout
, "\n");
1548 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1551 /* Since the current thread may have changed, see if there is any
1552 exited thread we can now delete. */
1559 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
, char **error_message
)
1561 if (catch_exceptions_with_msg (uiout
, do_captured_thread_select
, tidstr
,
1562 error_message
, RETURN_MASK_ALL
) < 0)
1567 /* Update the 'threads_executing' global based on the threads we know
1571 update_threads_executing (void)
1573 struct thread_info
*tp
;
1575 threads_executing
= 0;
1576 ALL_NON_EXITED_THREADS (tp
)
1580 threads_executing
= 1;
1587 update_thread_list (void)
1590 target_find_new_threads ();
1591 update_threads_executing ();
1594 /* Return a new value for the selected thread's id. Return a value of 0 if
1595 no thread is selected, or no threads exist. */
1597 static struct value
*
1598 thread_id_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
1601 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
1603 return value_from_longest (builtin_type (gdbarch
)->builtin_int
,
1604 (tp
? tp
->num
: 0));
1607 /* Commands with a prefix of `thread'. */
1608 struct cmd_list_element
*thread_cmd_list
= NULL
;
1610 /* Implementation of `thread' variable. */
1612 static const struct internalvar_funcs thread_funcs
=
1614 thread_id_make_value
,
1620 _initialize_thread (void)
1622 static struct cmd_list_element
*thread_apply_list
= NULL
;
1624 add_info ("threads", info_threads_command
,
1625 _("Display currently known threads.\n\
1626 Usage: info threads [ID]...\n\
1627 Optional arguments are thread IDs with spaces between.\n\
1628 If no arguments, all threads are displayed."));
1630 add_prefix_cmd ("thread", class_run
, thread_command
, _("\
1631 Use this command to switch between threads.\n\
1632 The new thread ID must be currently known."),
1633 &thread_cmd_list
, "thread ", 1, &cmdlist
);
1635 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
1636 _("Apply a command to a list of threads."),
1637 &thread_apply_list
, "thread apply ", 1, &thread_cmd_list
);
1639 add_cmd ("all", class_run
, thread_apply_all_command
,
1640 _("Apply a command to all threads."), &thread_apply_list
);
1642 add_cmd ("name", class_run
, thread_name_command
,
1643 _("Set the current thread's name.\n\
1644 Usage: thread name [NAME]\n\
1645 If NAME is not given, then any existing name is removed."), &thread_cmd_list
);
1647 add_cmd ("find", class_run
, thread_find_command
, _("\
1648 Find threads that match a regular expression.\n\
1649 Usage: thread find REGEXP\n\
1650 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1654 add_com_alias ("t", "thread", class_run
, 1);
1656 add_setshow_boolean_cmd ("thread-events", no_class
,
1657 &print_thread_events
, _("\
1658 Set printing of thread events (such as thread start and exit)."), _("\
1659 Show printing of thread events (such as thread start and exit)."), NULL
,
1661 show_print_thread_events
,
1662 &setprintlist
, &showprintlist
);
1664 create_internalvar_type_lazy ("_thread", &thread_funcs
, NULL
);