1 /* Multi-process/thread control for GDB, the GNU debugger.
3 Copyright (C) 1986-2013 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"
35 #include "gdb_string.h"
39 #include <sys/types.h>
44 #include "cli/cli-decode.h"
45 #include "gdb_regex.h"
46 #include "cli/cli-utils.h"
47 #include "continuations.h"
49 /* Definition of struct thread_info exported to gdbthread.h. */
51 /* Prototypes for exported functions. */
53 void _initialize_thread (void);
55 /* Prototypes for local functions. */
57 struct thread_info
*thread_list
= NULL
;
58 static int highest_thread_num
;
60 static void thread_command (char *tidstr
, int from_tty
);
61 static void thread_apply_all_command (char *, int);
62 static int thread_alive (struct thread_info
*);
63 static void info_threads_command (char *, int);
64 static void thread_apply_command (char *, int);
65 static void restore_current_thread (ptid_t
);
66 static void prune_threads (void);
69 inferior_thread (void)
71 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
77 delete_step_resume_breakpoint (struct thread_info
*tp
)
79 if (tp
&& tp
->control
.step_resume_breakpoint
)
81 delete_breakpoint (tp
->control
.step_resume_breakpoint
);
82 tp
->control
.step_resume_breakpoint
= NULL
;
87 delete_exception_resume_breakpoint (struct thread_info
*tp
)
89 if (tp
&& tp
->control
.exception_resume_breakpoint
)
91 delete_breakpoint (tp
->control
.exception_resume_breakpoint
);
92 tp
->control
.exception_resume_breakpoint
= NULL
;
97 clear_thread_inferior_resources (struct thread_info
*tp
)
99 /* NOTE: this will take care of any left-over step_resume breakpoints,
100 but not any user-specified thread-specific breakpoints. We can not
101 delete the breakpoint straight-off, because the inferior might not
102 be stopped at the moment. */
103 if (tp
->control
.step_resume_breakpoint
)
105 tp
->control
.step_resume_breakpoint
->disposition
= disp_del_at_next_stop
;
106 tp
->control
.step_resume_breakpoint
= NULL
;
109 if (tp
->control
.exception_resume_breakpoint
)
111 tp
->control
.exception_resume_breakpoint
->disposition
112 = disp_del_at_next_stop
;
113 tp
->control
.exception_resume_breakpoint
= NULL
;
116 delete_longjmp_breakpoint_at_next_stop (tp
->num
);
118 bpstat_clear (&tp
->control
.stop_bpstat
);
120 btrace_teardown (tp
);
122 do_all_intermediate_continuations_thread (tp
, 1);
123 do_all_continuations_thread (tp
, 1);
127 free_thread (struct thread_info
*tp
)
131 if (tp
->private_dtor
)
132 tp
->private_dtor (tp
->private);
142 init_thread_list (void)
144 struct thread_info
*tp
, *tpnext
;
146 highest_thread_num
= 0;
151 for (tp
= thread_list
; tp
; tp
= tpnext
)
160 /* Allocate a new thread with target id PTID and add it to the thread
163 static struct thread_info
*
164 new_thread (ptid_t ptid
)
166 struct thread_info
*tp
;
168 tp
= xcalloc (1, sizeof (*tp
));
171 tp
->num
= ++highest_thread_num
;
172 tp
->next
= thread_list
;
175 /* Nothing to follow yet. */
176 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
177 tp
->state
= THREAD_STOPPED
;
183 add_thread_silent (ptid_t ptid
)
185 struct thread_info
*tp
;
187 tp
= find_thread_ptid (ptid
);
189 /* Found an old thread with the same id. It has to be dead,
190 otherwise we wouldn't be adding a new thread with the same id.
191 The OS is reusing this id --- delete it, and recreate a new
194 /* In addition to deleting the thread, if this is the current
195 thread, then we need to take care that delete_thread doesn't
196 really delete the thread if it is inferior_ptid. Create a
197 new template thread in the list with an invalid ptid, switch
198 to it, delete the original thread, reset the new thread's
199 ptid, and switch to it. */
201 if (ptid_equal (inferior_ptid
, ptid
))
203 tp
= new_thread (null_ptid
);
205 /* Make switch_to_thread not read from the thread. */
206 tp
->state
= THREAD_EXITED
;
207 switch_to_thread (null_ptid
);
209 /* Now we can delete it. */
210 delete_thread (ptid
);
212 /* Now reset its ptid, and reswitch inferior_ptid to it. */
214 tp
->state
= THREAD_STOPPED
;
215 switch_to_thread (ptid
);
217 observer_notify_new_thread (tp
);
223 /* Just go ahead and delete it. */
224 delete_thread (ptid
);
227 tp
= new_thread (ptid
);
228 observer_notify_new_thread (tp
);
234 add_thread_with_info (ptid_t ptid
, struct private_thread_info
*private)
236 struct thread_info
*result
= add_thread_silent (ptid
);
238 result
->private = private;
240 if (print_thread_events
)
241 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid
));
243 annotate_new_thread ();
248 add_thread (ptid_t ptid
)
250 return add_thread_with_info (ptid
, NULL
);
253 /* Delete thread PTID. If SILENT, don't notify the observer of this
256 delete_thread_1 (ptid_t ptid
, int silent
)
258 struct thread_info
*tp
, *tpprev
;
262 for (tp
= thread_list
; tp
; tpprev
= tp
, tp
= tp
->next
)
263 if (ptid_equal (tp
->ptid
, ptid
))
269 /* If this is the current thread, or there's code out there that
270 relies on it existing (refcount > 0) we can't delete yet. Mark
271 it as exited, and notify it. */
273 || ptid_equal (tp
->ptid
, inferior_ptid
))
275 if (tp
->state
!= THREAD_EXITED
)
277 observer_notify_thread_exit (tp
, silent
);
279 /* Tag it as exited. */
280 tp
->state
= THREAD_EXITED
;
282 /* Clear breakpoints, etc. associated with this thread. */
283 clear_thread_inferior_resources (tp
);
286 /* Will be really deleted some other time. */
290 /* Notify thread exit, but only if we haven't already. */
291 if (tp
->state
!= THREAD_EXITED
)
292 observer_notify_thread_exit (tp
, silent
);
294 /* Tag it as exited. */
295 tp
->state
= THREAD_EXITED
;
296 clear_thread_inferior_resources (tp
);
299 tpprev
->next
= tp
->next
;
301 thread_list
= tp
->next
;
306 /* Delete thread PTID and notify of thread exit. If this is
307 inferior_ptid, don't actually delete it, but tag it as exited and
308 do the notification. If PTID is the user selected thread, clear
311 delete_thread (ptid_t ptid
)
313 delete_thread_1 (ptid
, 0 /* not silent */);
317 delete_thread_silent (ptid_t ptid
)
319 delete_thread_1 (ptid
, 1 /* silent */);
323 find_thread_id (int num
)
325 struct thread_info
*tp
;
327 for (tp
= thread_list
; tp
; tp
= tp
->next
)
334 /* Find a thread_info by matching PTID. */
336 find_thread_ptid (ptid_t ptid
)
338 struct thread_info
*tp
;
340 for (tp
= thread_list
; tp
; tp
= tp
->next
)
341 if (ptid_equal (tp
->ptid
, ptid
))
348 * Thread iterator function.
350 * Calls a callback function once for each thread, so long as
351 * the callback function returns false. If the callback function
352 * returns true, the iteration will end and the current thread
353 * will be returned. This can be useful for implementing a
354 * search for a thread with arbitrary attributes, or for applying
355 * some operation to every thread.
357 * FIXME: some of the existing functionality, such as
358 * "Thread apply all", might be rewritten using this functionality.
362 iterate_over_threads (int (*callback
) (struct thread_info
*, void *),
365 struct thread_info
*tp
, *next
;
367 for (tp
= thread_list
; tp
; tp
= next
)
370 if ((*callback
) (tp
, data
))
381 struct thread_info
*tp
;
383 for (tp
= thread_list
; tp
; tp
= tp
->next
)
390 valid_thread_id (int num
)
392 struct thread_info
*tp
;
394 for (tp
= thread_list
; tp
; tp
= tp
->next
)
402 pid_to_thread_id (ptid_t ptid
)
404 struct thread_info
*tp
;
406 for (tp
= thread_list
; tp
; tp
= tp
->next
)
407 if (ptid_equal (tp
->ptid
, ptid
))
414 thread_id_to_pid (int num
)
416 struct thread_info
*thread
= find_thread_id (num
);
421 return pid_to_ptid (-1);
425 in_thread_list (ptid_t ptid
)
427 struct thread_info
*tp
;
429 for (tp
= thread_list
; tp
; tp
= tp
->next
)
430 if (ptid_equal (tp
->ptid
, ptid
))
433 return 0; /* Never heard of 'im. */
436 /* Finds the first thread of the inferior given by PID. If PID is -1,
437 return the first thread in the list. */
440 first_thread_of_process (int pid
)
442 struct thread_info
*tp
, *ret
= NULL
;
444 for (tp
= thread_list
; tp
; tp
= tp
->next
)
445 if (pid
== -1 || ptid_get_pid (tp
->ptid
) == pid
)
446 if (ret
== NULL
|| tp
->num
< ret
->num
)
453 any_thread_of_process (int pid
)
455 struct thread_info
*tp
;
457 for (tp
= thread_list
; tp
; tp
= tp
->next
)
458 if (ptid_get_pid (tp
->ptid
) == pid
)
465 any_live_thread_of_process (int pid
)
467 struct thread_info
*tp
;
468 struct thread_info
*tp_executing
= NULL
;
470 for (tp
= thread_list
; tp
; tp
= tp
->next
)
471 if (tp
->state
!= THREAD_EXITED
&& ptid_get_pid (tp
->ptid
) == pid
)
482 /* Print a list of thread ids currently known, and the total number of
483 threads. To be used from within catch_errors. */
485 do_captured_list_thread_ids (struct ui_out
*uiout
, void *arg
)
487 struct thread_info
*tp
;
489 struct cleanup
*cleanup_chain
;
490 int current_thread
= -1;
492 update_thread_list ();
494 cleanup_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "thread-ids");
496 for (tp
= thread_list
; tp
; tp
= tp
->next
)
498 if (tp
->state
== THREAD_EXITED
)
501 if (ptid_equal (tp
->ptid
, inferior_ptid
))
502 current_thread
= tp
->num
;
505 ui_out_field_int (uiout
, "thread-id", tp
->num
);
508 do_cleanups (cleanup_chain
);
510 if (current_thread
!= -1)
511 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
512 ui_out_field_int (uiout
, "number-of-threads", num
);
516 /* Official gdblib interface function to get a list of thread ids and
519 gdb_list_thread_ids (struct ui_out
*uiout
, char **error_message
)
521 if (catch_exceptions_with_msg (uiout
, do_captured_list_thread_ids
, NULL
,
522 error_message
, RETURN_MASK_ALL
) < 0)
527 /* Return true if TP is an active thread. */
529 thread_alive (struct thread_info
*tp
)
531 if (tp
->state
== THREAD_EXITED
)
533 if (!target_thread_alive (tp
->ptid
))
541 struct thread_info
*tp
, *next
;
543 for (tp
= thread_list
; tp
; tp
= next
)
546 if (!thread_alive (tp
))
547 delete_thread (tp
->ptid
);
552 thread_change_ptid (ptid_t old_ptid
, ptid_t new_ptid
)
554 struct inferior
*inf
;
555 struct thread_info
*tp
;
557 /* It can happen that what we knew as the target inferior id
558 changes. E.g, target remote may only discover the remote process
559 pid after adding the inferior to GDB's list. */
560 inf
= find_inferior_pid (ptid_get_pid (old_ptid
));
561 inf
->pid
= ptid_get_pid (new_ptid
);
563 tp
= find_thread_ptid (old_ptid
);
566 observer_notify_thread_ptid_changed (old_ptid
, new_ptid
);
570 set_running (ptid_t ptid
, int running
)
572 struct thread_info
*tp
;
573 int all
= ptid_equal (ptid
, minus_one_ptid
);
575 /* We try not to notify the observer if no thread has actually changed
576 the running state -- merely to reduce the number of messages to
577 frontend. Frontend is supposed to handle multiple *running just fine. */
578 if (all
|| ptid_is_pid (ptid
))
582 for (tp
= thread_list
; tp
; tp
= tp
->next
)
583 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
585 if (tp
->state
== THREAD_EXITED
)
587 if (running
&& tp
->state
== THREAD_STOPPED
)
589 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
592 observer_notify_target_resumed (ptid
);
598 tp
= find_thread_ptid (ptid
);
600 gdb_assert (tp
->state
!= THREAD_EXITED
);
601 if (running
&& tp
->state
== THREAD_STOPPED
)
603 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
605 observer_notify_target_resumed (ptid
);
610 is_thread_state (ptid_t ptid
, enum thread_state state
)
612 struct thread_info
*tp
;
614 tp
= find_thread_ptid (ptid
);
616 return tp
->state
== state
;
620 is_stopped (ptid_t ptid
)
622 return is_thread_state (ptid
, THREAD_STOPPED
);
626 is_exited (ptid_t ptid
)
628 return is_thread_state (ptid
, THREAD_EXITED
);
632 is_running (ptid_t ptid
)
634 return is_thread_state (ptid
, THREAD_RUNNING
);
640 struct thread_info
*tp
;
642 for (tp
= thread_list
; tp
; tp
= tp
->next
)
643 if (tp
->state
== THREAD_RUNNING
)
650 is_executing (ptid_t ptid
)
652 struct thread_info
*tp
;
654 tp
= find_thread_ptid (ptid
);
656 return tp
->executing
;
660 set_executing (ptid_t ptid
, int executing
)
662 struct thread_info
*tp
;
663 int all
= ptid_equal (ptid
, minus_one_ptid
);
665 if (all
|| ptid_is_pid (ptid
))
667 for (tp
= thread_list
; tp
; tp
= tp
->next
)
668 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
669 tp
->executing
= executing
;
673 tp
= find_thread_ptid (ptid
);
675 tp
->executing
= executing
;
680 set_stop_requested (ptid_t ptid
, int stop
)
682 struct thread_info
*tp
;
683 int all
= ptid_equal (ptid
, minus_one_ptid
);
685 if (all
|| ptid_is_pid (ptid
))
687 for (tp
= thread_list
; tp
; tp
= tp
->next
)
688 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
689 tp
->stop_requested
= stop
;
693 tp
= find_thread_ptid (ptid
);
695 tp
->stop_requested
= stop
;
698 /* Call the stop requested observer so other components of GDB can
699 react to this request. */
701 observer_notify_thread_stop_requested (ptid
);
705 finish_thread_state (ptid_t ptid
)
707 struct thread_info
*tp
;
711 all
= ptid_equal (ptid
, minus_one_ptid
);
713 if (all
|| ptid_is_pid (ptid
))
715 for (tp
= thread_list
; tp
; tp
= tp
->next
)
717 if (tp
->state
== THREAD_EXITED
)
719 if (all
|| ptid_get_pid (ptid
) == ptid_get_pid (tp
->ptid
))
721 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
723 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
729 tp
= find_thread_ptid (ptid
);
731 if (tp
->state
!= THREAD_EXITED
)
733 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
735 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
740 observer_notify_target_resumed (ptid
);
744 finish_thread_state_cleanup (void *arg
)
746 ptid_t
*ptid_p
= arg
;
750 finish_thread_state (*ptid_p
);
754 pc_in_thread_step_range (CORE_ADDR pc
, struct thread_info
*thread
)
756 return (pc
>= thread
->control
.step_range_start
757 && pc
< thread
->control
.step_range_end
);
760 /* Prints the list of threads and their details on UIOUT.
761 This is a version of 'info_threads_command' suitable for
763 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
764 that should be printed. Otherwise, all threads are
766 If PID is not -1, only print threads from the process PID.
767 Otherwise, threads from all attached PIDs are printed.
768 If both REQUESTED_THREAD and PID are not -1, then the thread
769 is printed if it belongs to the specified process. Otherwise,
770 an error is raised. */
772 print_thread_info (struct ui_out
*uiout
, char *requested_threads
, int pid
)
774 struct thread_info
*tp
;
776 struct cleanup
*old_chain
;
777 char *extra_info
, *name
, *target_id
;
778 int current_thread
= -1;
780 update_thread_list ();
781 current_ptid
= inferior_ptid
;
783 /* We'll be switching threads temporarily. */
784 old_chain
= make_cleanup_restore_current_thread ();
786 /* For backward compatibility, we make a list for MI. A table is
787 preferable for the CLI, though, because it shows table
789 if (ui_out_is_mi_like_p (uiout
))
790 make_cleanup_ui_out_list_begin_end (uiout
, "threads");
795 for (tp
= thread_list
; tp
; tp
= tp
->next
)
797 if (!number_is_in_list (requested_threads
, tp
->num
))
800 if (pid
!= -1 && PIDGET (tp
->ptid
) != pid
)
803 if (tp
->state
== THREAD_EXITED
)
811 if (requested_threads
== NULL
|| *requested_threads
== '\0')
812 ui_out_message (uiout
, 0, _("No threads.\n"));
814 ui_out_message (uiout
, 0, _("No threads match '%s'.\n"),
816 do_cleanups (old_chain
);
820 make_cleanup_ui_out_table_begin_end (uiout
, 4, n_threads
, "threads");
822 ui_out_table_header (uiout
, 1, ui_left
, "current", "");
823 ui_out_table_header (uiout
, 4, ui_left
, "id", "Id");
824 ui_out_table_header (uiout
, 17, ui_left
, "target-id", "Target Id");
825 ui_out_table_header (uiout
, 1, ui_left
, "frame", "Frame");
826 ui_out_table_body (uiout
);
829 for (tp
= thread_list
; tp
; tp
= tp
->next
)
831 struct cleanup
*chain2
;
834 if (!number_is_in_list (requested_threads
, tp
->num
))
837 if (pid
!= -1 && PIDGET (tp
->ptid
) != pid
)
839 if (requested_threads
!= NULL
&& *requested_threads
!= '\0')
840 error (_("Requested thread not found in requested process"));
844 if (ptid_equal (tp
->ptid
, current_ptid
))
845 current_thread
= tp
->num
;
847 if (tp
->state
== THREAD_EXITED
)
850 chain2
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
852 if (ui_out_is_mi_like_p (uiout
))
855 if (ptid_equal (tp
->ptid
, current_ptid
))
856 ui_out_text (uiout
, "* ");
858 ui_out_text (uiout
, " ");
862 if (ptid_equal (tp
->ptid
, current_ptid
))
863 ui_out_field_string (uiout
, "current", "*");
865 ui_out_field_skip (uiout
, "current");
868 ui_out_field_int (uiout
, "id", tp
->num
);
870 /* For the CLI, we stuff everything into the target-id field.
871 This is a gross hack to make the output come out looking
872 correct. The underlying problem here is that ui-out has no
873 way to specify that a field's space allocation should be
874 shared by several fields. For MI, we do the right thing
877 target_id
= target_pid_to_str (tp
->ptid
);
878 extra_info
= target_extra_thread_info (tp
);
879 name
= tp
->name
? tp
->name
: target_thread_name (tp
);
881 if (ui_out_is_mi_like_p (uiout
))
883 ui_out_field_string (uiout
, "target-id", target_id
);
885 ui_out_field_string (uiout
, "details", extra_info
);
887 ui_out_field_string (uiout
, "name", name
);
891 struct cleanup
*str_cleanup
;
894 if (extra_info
&& name
)
895 contents
= xstrprintf ("%s \"%s\" (%s)", target_id
,
898 contents
= xstrprintf ("%s (%s)", target_id
, extra_info
);
900 contents
= xstrprintf ("%s \"%s\"", target_id
, name
);
902 contents
= xstrdup (target_id
);
903 str_cleanup
= make_cleanup (xfree
, contents
);
905 ui_out_field_string (uiout
, "target-id", contents
);
906 do_cleanups (str_cleanup
);
909 if (tp
->state
== THREAD_RUNNING
)
910 ui_out_text (uiout
, "(running)\n");
913 /* The switch below puts us at the top of the stack (leaf
915 switch_to_thread (tp
->ptid
);
916 print_stack_frame (get_selected_frame (NULL
),
917 /* For MI output, print frame level. */
918 ui_out_is_mi_like_p (uiout
),
922 if (ui_out_is_mi_like_p (uiout
))
924 char *state
= "stopped";
926 if (tp
->state
== THREAD_RUNNING
)
928 ui_out_field_string (uiout
, "state", state
);
931 core
= target_core_of_thread (tp
->ptid
);
932 if (ui_out_is_mi_like_p (uiout
) && core
!= -1)
933 ui_out_field_int (uiout
, "core", core
);
935 do_cleanups (chain2
);
938 /* Restores the current thread and the frame selected before
939 the "info threads" command. */
940 do_cleanups (old_chain
);
942 if (pid
== -1 && requested_threads
== NULL
)
944 gdb_assert (current_thread
!= -1
946 || ptid_equal (inferior_ptid
, null_ptid
));
947 if (current_thread
!= -1 && ui_out_is_mi_like_p (uiout
))
948 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
950 if (current_thread
!= -1 && is_exited (current_ptid
))
951 ui_out_message (uiout
, 0, "\n\
952 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
955 && current_thread
== -1
956 && ptid_equal (current_ptid
, null_ptid
))
957 ui_out_message (uiout
, 0, "\n\
958 No selected thread. See `help thread'.\n");
962 /* Print information about currently known threads
964 Optional ARG is a thread id, or list of thread ids.
966 Note: this has the drawback that it _really_ switches
967 threads, which frees the frame cache. A no-side
968 effects info-threads command would be nicer. */
971 info_threads_command (char *arg
, int from_tty
)
973 print_thread_info (current_uiout
, arg
, -1);
976 /* Switch from one thread to another. */
979 switch_to_thread (ptid_t ptid
)
981 /* Switch the program space as well, if we can infer it from the now
982 current thread. Otherwise, it's up to the caller to select the
984 if (!ptid_equal (ptid
, null_ptid
))
986 struct inferior
*inf
;
988 inf
= find_inferior_pid (ptid_get_pid (ptid
));
989 gdb_assert (inf
!= NULL
);
990 set_current_program_space (inf
->pspace
);
991 set_current_inferior (inf
);
994 if (ptid_equal (ptid
, inferior_ptid
))
997 inferior_ptid
= ptid
;
998 reinit_frame_cache ();
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 (current_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
;
1087 do_restore_current_thread_cleanup (void *arg
)
1089 struct thread_info
*tp
;
1090 struct current_thread_cleanup
*old
= arg
;
1092 tp
= find_thread_ptid (old
->inferior_ptid
);
1094 /* If the previously selected thread belonged to a process that has
1095 in the mean time been deleted (due to normal exit, detach, etc.),
1096 then don't revert back to it, but instead simply drop back to no
1099 && find_inferior_pid (ptid_get_pid (tp
->ptid
)) != NULL
)
1100 restore_current_thread (old
->inferior_ptid
);
1103 restore_current_thread (null_ptid
);
1104 set_current_inferior (find_inferior_id (old
->inf_id
));
1107 /* The running state of the originally selected thread may have
1108 changed, so we have to recheck it here. */
1109 if (!ptid_equal (inferior_ptid
, null_ptid
)
1111 && is_stopped (inferior_ptid
)
1112 && target_has_registers
1114 && target_has_memory
)
1115 restore_selected_frame (old
->selected_frame_id
,
1116 old
->selected_frame_level
);
1120 restore_current_thread_cleanup_dtor (void *arg
)
1122 struct current_thread_cleanup
*old
= arg
;
1123 struct thread_info
*tp
;
1124 struct inferior
*inf
;
1126 tp
= find_thread_ptid (old
->inferior_ptid
);
1129 inf
= find_inferior_id (old
->inf_id
);
1131 inf
->removable
= old
->was_removable
;
1136 make_cleanup_restore_current_thread (void)
1138 struct thread_info
*tp
;
1139 struct frame_info
*frame
;
1140 struct current_thread_cleanup
*old
;
1142 old
= xmalloc (sizeof (struct current_thread_cleanup
));
1143 old
->inferior_ptid
= inferior_ptid
;
1144 old
->inf_id
= current_inferior ()->num
;
1145 old
->was_removable
= current_inferior ()->removable
;
1147 if (!ptid_equal (inferior_ptid
, null_ptid
))
1149 old
->was_stopped
= is_stopped (inferior_ptid
);
1150 if (old
->was_stopped
1151 && target_has_registers
1153 && target_has_memory
)
1155 /* When processing internal events, there might not be a
1156 selected frame. If we naively call get_selected_frame
1157 here, then we can end up reading debuginfo for the
1158 current frame, but we don't generally need the debuginfo
1160 frame
= get_selected_frame_if_set ();
1165 old
->selected_frame_id
= get_frame_id (frame
);
1166 old
->selected_frame_level
= frame_relative_level (frame
);
1168 tp
= find_thread_ptid (inferior_ptid
);
1173 current_inferior ()->removable
= 0;
1175 return make_cleanup_dtor (do_restore_current_thread_cleanup
, old
,
1176 restore_current_thread_cleanup_dtor
);
1179 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1180 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1181 of two numbers seperated by a hyphen. Examples:
1183 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1184 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1185 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1188 thread_apply_all_command (char *cmd
, int from_tty
)
1190 struct thread_info
*tp
;
1191 struct cleanup
*old_chain
;
1194 if (cmd
== NULL
|| *cmd
== '\000')
1195 error (_("Please specify a command following the thread ID list"));
1197 update_thread_list ();
1199 old_chain
= make_cleanup_restore_current_thread ();
1201 /* Save a copy of the command in case it is clobbered by
1203 saved_cmd
= xstrdup (cmd
);
1204 make_cleanup (xfree
, saved_cmd
);
1205 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1206 if (thread_alive (tp
))
1208 switch_to_thread (tp
->ptid
);
1210 printf_filtered (_("\nThread %d (%s):\n"),
1211 tp
->num
, target_pid_to_str (inferior_ptid
));
1212 execute_command (cmd
, from_tty
);
1213 strcpy (cmd
, saved_cmd
); /* Restore exact command used
1217 do_cleanups (old_chain
);
1221 thread_apply_command (char *tidlist
, int from_tty
)
1224 struct cleanup
*old_chain
;
1226 struct get_number_or_range_state state
;
1228 if (tidlist
== NULL
|| *tidlist
== '\000')
1229 error (_("Please specify a thread ID list"));
1231 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
1234 error (_("Please specify a command following the thread ID list"));
1236 /* Save a copy of the command in case it is clobbered by
1238 saved_cmd
= xstrdup (cmd
);
1239 old_chain
= make_cleanup (xfree
, saved_cmd
);
1241 init_number_or_range (&state
, tidlist
);
1242 while (!state
.finished
&& state
.string
< cmd
)
1244 struct thread_info
*tp
;
1247 start
= get_number_or_range (&state
);
1249 make_cleanup_restore_current_thread ();
1251 tp
= find_thread_id (start
);
1254 warning (_("Unknown thread %d."), start
);
1255 else if (!thread_alive (tp
))
1256 warning (_("Thread %d has terminated."), start
);
1259 switch_to_thread (tp
->ptid
);
1261 printf_filtered (_("\nThread %d (%s):\n"), tp
->num
,
1262 target_pid_to_str (inferior_ptid
));
1263 execute_command (cmd
, from_tty
);
1265 /* Restore exact command used previously. */
1266 strcpy (cmd
, saved_cmd
);
1270 do_cleanups (old_chain
);
1273 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1274 if prefix of arg is `apply'. */
1277 thread_command (char *tidstr
, int from_tty
)
1281 if (ptid_equal (inferior_ptid
, null_ptid
))
1282 error (_("No thread selected"));
1284 if (target_has_stack
)
1286 if (is_exited (inferior_ptid
))
1287 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1288 pid_to_thread_id (inferior_ptid
),
1289 target_pid_to_str (inferior_ptid
));
1291 printf_filtered (_("[Current thread is %d (%s)]\n"),
1292 pid_to_thread_id (inferior_ptid
),
1293 target_pid_to_str (inferior_ptid
));
1296 error (_("No stack."));
1300 gdb_thread_select (current_uiout
, tidstr
, NULL
);
1303 /* Implementation of `thread name'. */
1306 thread_name_command (char *arg
, int from_tty
)
1308 struct thread_info
*info
;
1310 if (ptid_equal (inferior_ptid
, null_ptid
))
1311 error (_("No thread selected"));
1313 arg
= skip_spaces (arg
);
1315 info
= inferior_thread ();
1317 info
->name
= arg
? xstrdup (arg
) : NULL
;
1320 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1323 thread_find_command (char *arg
, int from_tty
)
1325 struct thread_info
*tp
;
1327 unsigned long match
= 0;
1329 if (arg
== NULL
|| *arg
== '\0')
1330 error (_("Command requires an argument."));
1332 tmp
= re_comp (arg
);
1334 error (_("Invalid regexp (%s): %s"), tmp
, arg
);
1336 update_thread_list ();
1337 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1339 if (tp
->name
!= NULL
&& re_exec (tp
->name
))
1341 printf_filtered (_("Thread %d has name '%s'\n"),
1346 tmp
= target_thread_name (tp
);
1347 if (tmp
!= NULL
&& re_exec (tmp
))
1349 printf_filtered (_("Thread %d has target name '%s'\n"),
1354 tmp
= target_pid_to_str (tp
->ptid
);
1355 if (tmp
!= NULL
&& re_exec (tmp
))
1357 printf_filtered (_("Thread %d has target id '%s'\n"),
1362 tmp
= target_extra_thread_info (tp
);
1363 if (tmp
!= NULL
&& re_exec (tmp
))
1365 printf_filtered (_("Thread %d has extra info '%s'\n"),
1371 printf_filtered (_("No threads match '%s'\n"), arg
);
1374 /* Print notices when new threads are attached and detached. */
1375 int print_thread_events
= 1;
1377 show_print_thread_events (struct ui_file
*file
, int from_tty
,
1378 struct cmd_list_element
*c
, const char *value
)
1380 fprintf_filtered (file
,
1381 _("Printing of thread events is %s.\n"),
1386 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
1389 struct thread_info
*tp
;
1391 num
= value_as_long (parse_and_eval (tidstr
));
1393 tp
= find_thread_id (num
);
1396 error (_("Thread ID %d not known."), num
);
1398 if (!thread_alive (tp
))
1399 error (_("Thread ID %d has terminated."), num
);
1401 switch_to_thread (tp
->ptid
);
1403 annotate_thread_changed ();
1405 ui_out_text (uiout
, "[Switching to thread ");
1406 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
1407 ui_out_text (uiout
, " (");
1408 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
1409 ui_out_text (uiout
, ")]");
1411 /* Note that we can't reach this with an exited thread, due to the
1412 thread_alive check above. */
1413 if (tp
->state
== THREAD_RUNNING
)
1414 ui_out_text (uiout
, "(running)\n");
1417 ui_out_text (uiout
, "\n");
1418 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1421 /* Since the current thread may have changed, see if there is any
1422 exited thread we can now delete. */
1429 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
, char **error_message
)
1431 if (catch_exceptions_with_msg (uiout
, do_captured_thread_select
, tidstr
,
1432 error_message
, RETURN_MASK_ALL
) < 0)
1438 update_thread_list (void)
1441 target_find_new_threads ();
1444 /* Return a new value for the selected thread's id. Return a value of 0 if
1445 no thread is selected, or no threads exist. */
1447 static struct value
*
1448 thread_id_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
1451 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
1453 return value_from_longest (builtin_type (gdbarch
)->builtin_int
,
1454 (tp
? tp
->num
: 0));
1457 /* Commands with a prefix of `thread'. */
1458 struct cmd_list_element
*thread_cmd_list
= NULL
;
1460 /* Implementation of `thread' variable. */
1462 static const struct internalvar_funcs thread_funcs
=
1464 thread_id_make_value
,
1470 _initialize_thread (void)
1472 static struct cmd_list_element
*thread_apply_list
= NULL
;
1474 add_info ("threads", info_threads_command
,
1475 _("Display currently known threads.\n\
1476 Usage: info threads [ID]...\n\
1477 Optional arguments are thread IDs with spaces between.\n\
1478 If no arguments, all threads are displayed."));
1480 add_prefix_cmd ("thread", class_run
, thread_command
, _("\
1481 Use this command to switch between threads.\n\
1482 The new thread ID must be currently known."),
1483 &thread_cmd_list
, "thread ", 1, &cmdlist
);
1485 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
1486 _("Apply a command to a list of threads."),
1487 &thread_apply_list
, "thread apply ", 1, &thread_cmd_list
);
1489 add_cmd ("all", class_run
, thread_apply_all_command
,
1490 _("Apply a command to all threads."), &thread_apply_list
);
1492 add_cmd ("name", class_run
, thread_name_command
,
1493 _("Set the current thread's name.\n\
1494 Usage: thread name [NAME]\n\
1495 If NAME is not given, then any existing name is removed."), &thread_cmd_list
);
1497 add_cmd ("find", class_run
, thread_find_command
, _("\
1498 Find threads that match a regular expression.\n\
1499 Usage: thread find REGEXP\n\
1500 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1504 add_com_alias ("t", "thread", class_run
, 1);
1506 add_setshow_boolean_cmd ("thread-events", no_class
,
1507 &print_thread_events
, _("\
1508 Set printing of thread events (such as thread start and exit)."), _("\
1509 Show printing of thread events (such as thread start and exit)."), NULL
,
1511 show_print_thread_events
,
1512 &setprintlist
, &showprintlist
);
1514 create_internalvar_type_lazy ("_thread", &thread_funcs
, NULL
);