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 for (tp
= thread_list
; tp
; tp
= tp
->next
)
470 if (ptid_get_pid (tp
->ptid
) == pid
)
477 any_live_thread_of_process (int pid
)
479 struct thread_info
*tp
;
480 struct thread_info
*tp_executing
= NULL
;
482 for (tp
= thread_list
; tp
; tp
= tp
->next
)
483 if (tp
->state
!= THREAD_EXITED
&& ptid_get_pid (tp
->ptid
) == pid
)
494 /* Print a list of thread ids currently known, and the total number of
495 threads. To be used from within catch_errors. */
497 do_captured_list_thread_ids (struct ui_out
*uiout
, void *arg
)
499 struct thread_info
*tp
;
501 struct cleanup
*cleanup_chain
;
502 int current_thread
= -1;
504 update_thread_list ();
506 cleanup_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "thread-ids");
508 for (tp
= thread_list
; tp
; tp
= tp
->next
)
510 if (tp
->state
== THREAD_EXITED
)
513 if (ptid_equal (tp
->ptid
, inferior_ptid
))
514 current_thread
= tp
->num
;
517 ui_out_field_int (uiout
, "thread-id", tp
->num
);
520 do_cleanups (cleanup_chain
);
522 if (current_thread
!= -1)
523 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
524 ui_out_field_int (uiout
, "number-of-threads", num
);
528 /* Official gdblib interface function to get a list of thread ids and
531 gdb_list_thread_ids (struct ui_out
*uiout
, char **error_message
)
533 if (catch_exceptions_with_msg (uiout
, do_captured_list_thread_ids
, NULL
,
534 error_message
, RETURN_MASK_ALL
) < 0)
539 /* Return true if TP is an active thread. */
541 thread_alive (struct thread_info
*tp
)
543 if (tp
->state
== THREAD_EXITED
)
545 if (!target_thread_alive (tp
->ptid
))
553 struct thread_info
*tp
, *next
;
555 for (tp
= thread_list
; tp
; tp
= next
)
558 if (!thread_alive (tp
))
559 delete_thread (tp
->ptid
);
564 thread_change_ptid (ptid_t old_ptid
, ptid_t new_ptid
)
566 struct inferior
*inf
;
567 struct thread_info
*tp
;
569 /* It can happen that what we knew as the target inferior id
570 changes. E.g, target remote may only discover the remote process
571 pid after adding the inferior to GDB's list. */
572 inf
= find_inferior_pid (ptid_get_pid (old_ptid
));
573 inf
->pid
= ptid_get_pid (new_ptid
);
575 tp
= find_thread_ptid (old_ptid
);
578 observer_notify_thread_ptid_changed (old_ptid
, new_ptid
);
582 set_running (ptid_t ptid
, int running
)
584 struct thread_info
*tp
;
585 int all
= ptid_equal (ptid
, minus_one_ptid
);
587 /* We try not to notify the observer if no thread has actually changed
588 the running state -- merely to reduce the number of messages to
589 frontend. Frontend is supposed to handle multiple *running just fine. */
590 if (all
|| ptid_is_pid (ptid
))
594 for (tp
= thread_list
; tp
; tp
= tp
->next
)
595 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
597 if (tp
->state
== THREAD_EXITED
)
599 if (running
&& tp
->state
== THREAD_STOPPED
)
601 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
604 observer_notify_target_resumed (ptid
);
610 tp
= find_thread_ptid (ptid
);
612 gdb_assert (tp
->state
!= THREAD_EXITED
);
613 if (running
&& tp
->state
== THREAD_STOPPED
)
615 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
617 observer_notify_target_resumed (ptid
);
622 is_thread_state (ptid_t ptid
, enum thread_state state
)
624 struct thread_info
*tp
;
626 tp
= find_thread_ptid (ptid
);
628 return tp
->state
== state
;
632 is_stopped (ptid_t ptid
)
634 return is_thread_state (ptid
, THREAD_STOPPED
);
638 is_exited (ptid_t ptid
)
640 return is_thread_state (ptid
, THREAD_EXITED
);
644 is_running (ptid_t ptid
)
646 return is_thread_state (ptid
, 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 && ptid_get_pid (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 && ptid_get_pid (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. Bottom (innermost) frame selected:"),
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_AND_LOC
, 1);
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
;
1135 /* Set the thread reference count. */
1138 set_thread_refcount (void *data
)
1141 struct thread_array_cleanup
*ta_cleanup
= data
;
1143 for (k
= 0; k
!= ta_cleanup
->count
; k
++)
1144 ta_cleanup
->tp_array
[k
]->refcount
--;
1148 make_cleanup_restore_current_thread (void)
1150 struct thread_info
*tp
;
1151 struct frame_info
*frame
;
1152 struct current_thread_cleanup
*old
;
1154 old
= xmalloc (sizeof (struct current_thread_cleanup
));
1155 old
->inferior_ptid
= inferior_ptid
;
1156 old
->inf_id
= current_inferior ()->num
;
1157 old
->was_removable
= current_inferior ()->removable
;
1159 if (!ptid_equal (inferior_ptid
, null_ptid
))
1161 old
->was_stopped
= is_stopped (inferior_ptid
);
1162 if (old
->was_stopped
1163 && target_has_registers
1165 && target_has_memory
)
1167 /* When processing internal events, there might not be a
1168 selected frame. If we naively call get_selected_frame
1169 here, then we can end up reading debuginfo for the
1170 current frame, but we don't generally need the debuginfo
1172 frame
= get_selected_frame_if_set ();
1177 old
->selected_frame_id
= get_frame_id (frame
);
1178 old
->selected_frame_level
= frame_relative_level (frame
);
1180 tp
= find_thread_ptid (inferior_ptid
);
1185 current_inferior ()->removable
= 0;
1187 return make_cleanup_dtor (do_restore_current_thread_cleanup
, old
,
1188 restore_current_thread_cleanup_dtor
);
1191 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1192 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1193 of two numbers seperated by a hyphen. Examples:
1195 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1196 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1197 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1200 thread_apply_all_command (char *cmd
, int from_tty
)
1202 struct cleanup
*old_chain
;
1205 struct thread_array_cleanup ta_cleanup
;
1207 if (cmd
== NULL
|| *cmd
== '\000')
1208 error (_("Please specify a command following the thread ID list"));
1210 update_thread_list ();
1212 old_chain
= make_cleanup_restore_current_thread ();
1214 /* Save a copy of the command in case it is clobbered by
1216 saved_cmd
= xstrdup (cmd
);
1217 make_cleanup (xfree
, saved_cmd
);
1218 tc
= thread_count ();
1222 struct thread_info
**tp_array
;
1223 struct thread_info
*tp
;
1226 /* Save a copy of the thread_list in case we execute detach
1228 tp_array
= xmalloc (sizeof (struct thread_info
*) * tc
);
1229 make_cleanup (xfree
, tp_array
);
1230 ta_cleanup
.tp_array
= tp_array
;
1231 ta_cleanup
.count
= tc
;
1233 ALL_NON_EXITED_THREADS (tp
)
1240 make_cleanup (set_thread_refcount
, &ta_cleanup
);
1242 for (k
= 0; k
!= i
; k
++)
1243 if (thread_alive (tp_array
[k
]))
1245 switch_to_thread (tp_array
[k
]->ptid
);
1246 printf_filtered (_("\nThread %d (%s):\n"),
1248 target_pid_to_str (inferior_ptid
));
1249 execute_command (cmd
, from_tty
);
1251 /* Restore exact command used previously. */
1252 strcpy (cmd
, saved_cmd
);
1256 do_cleanups (old_chain
);
1260 thread_apply_command (char *tidlist
, int from_tty
)
1263 struct cleanup
*old_chain
;
1265 struct get_number_or_range_state state
;
1267 if (tidlist
== NULL
|| *tidlist
== '\000')
1268 error (_("Please specify a thread ID list"));
1270 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
1273 error (_("Please specify a command following the thread ID list"));
1275 /* Save a copy of the command in case it is clobbered by
1277 saved_cmd
= xstrdup (cmd
);
1278 old_chain
= make_cleanup (xfree
, saved_cmd
);
1280 init_number_or_range (&state
, tidlist
);
1281 while (!state
.finished
&& state
.string
< cmd
)
1283 struct thread_info
*tp
;
1286 start
= get_number_or_range (&state
);
1288 make_cleanup_restore_current_thread ();
1290 tp
= find_thread_id (start
);
1293 warning (_("Unknown thread %d."), start
);
1294 else if (!thread_alive (tp
))
1295 warning (_("Thread %d has terminated."), start
);
1298 switch_to_thread (tp
->ptid
);
1300 printf_filtered (_("\nThread %d (%s):\n"), tp
->num
,
1301 target_pid_to_str (inferior_ptid
));
1302 execute_command (cmd
, from_tty
);
1304 /* Restore exact command used previously. */
1305 strcpy (cmd
, saved_cmd
);
1309 do_cleanups (old_chain
);
1312 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1313 if prefix of arg is `apply'. */
1316 thread_command (char *tidstr
, int from_tty
)
1320 if (ptid_equal (inferior_ptid
, null_ptid
))
1321 error (_("No thread selected"));
1323 if (target_has_stack
)
1325 if (is_exited (inferior_ptid
))
1326 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1327 pid_to_thread_id (inferior_ptid
),
1328 target_pid_to_str (inferior_ptid
));
1330 printf_filtered (_("[Current thread is %d (%s)]\n"),
1331 pid_to_thread_id (inferior_ptid
),
1332 target_pid_to_str (inferior_ptid
));
1335 error (_("No stack."));
1339 gdb_thread_select (current_uiout
, tidstr
, NULL
);
1342 /* Implementation of `thread name'. */
1345 thread_name_command (char *arg
, int from_tty
)
1347 struct thread_info
*info
;
1349 if (ptid_equal (inferior_ptid
, null_ptid
))
1350 error (_("No thread selected"));
1352 arg
= skip_spaces (arg
);
1354 info
= inferior_thread ();
1356 info
->name
= arg
? xstrdup (arg
) : NULL
;
1359 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1362 thread_find_command (char *arg
, int from_tty
)
1364 struct thread_info
*tp
;
1366 unsigned long match
= 0;
1368 if (arg
== NULL
|| *arg
== '\0')
1369 error (_("Command requires an argument."));
1371 tmp
= re_comp (arg
);
1373 error (_("Invalid regexp (%s): %s"), tmp
, arg
);
1375 update_thread_list ();
1376 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1378 if (tp
->name
!= NULL
&& re_exec (tp
->name
))
1380 printf_filtered (_("Thread %d has name '%s'\n"),
1385 tmp
= target_thread_name (tp
);
1386 if (tmp
!= NULL
&& re_exec (tmp
))
1388 printf_filtered (_("Thread %d has target name '%s'\n"),
1393 tmp
= target_pid_to_str (tp
->ptid
);
1394 if (tmp
!= NULL
&& re_exec (tmp
))
1396 printf_filtered (_("Thread %d has target id '%s'\n"),
1401 tmp
= target_extra_thread_info (tp
);
1402 if (tmp
!= NULL
&& re_exec (tmp
))
1404 printf_filtered (_("Thread %d has extra info '%s'\n"),
1410 printf_filtered (_("No threads match '%s'\n"), arg
);
1413 /* Print notices when new threads are attached and detached. */
1414 int print_thread_events
= 1;
1416 show_print_thread_events (struct ui_file
*file
, int from_tty
,
1417 struct cmd_list_element
*c
, const char *value
)
1419 fprintf_filtered (file
,
1420 _("Printing of thread events is %s.\n"),
1425 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
1428 struct thread_info
*tp
;
1430 num
= value_as_long (parse_and_eval (tidstr
));
1432 tp
= find_thread_id (num
);
1435 error (_("Thread ID %d not known."), num
);
1437 if (!thread_alive (tp
))
1438 error (_("Thread ID %d has terminated."), num
);
1440 switch_to_thread (tp
->ptid
);
1442 annotate_thread_changed ();
1444 ui_out_text (uiout
, "[Switching to thread ");
1445 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
1446 ui_out_text (uiout
, " (");
1447 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
1448 ui_out_text (uiout
, ")]");
1450 /* Note that we can't reach this with an exited thread, due to the
1451 thread_alive check above. */
1452 if (tp
->state
== THREAD_RUNNING
)
1453 ui_out_text (uiout
, "(running)\n");
1456 ui_out_text (uiout
, "\n");
1457 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1460 /* Since the current thread may have changed, see if there is any
1461 exited thread we can now delete. */
1468 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
, char **error_message
)
1470 if (catch_exceptions_with_msg (uiout
, do_captured_thread_select
, tidstr
,
1471 error_message
, RETURN_MASK_ALL
) < 0)
1477 update_thread_list (void)
1480 target_find_new_threads ();
1483 /* Return a new value for the selected thread's id. Return a value of 0 if
1484 no thread is selected, or no threads exist. */
1486 static struct value
*
1487 thread_id_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
1490 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
1492 return value_from_longest (builtin_type (gdbarch
)->builtin_int
,
1493 (tp
? tp
->num
: 0));
1496 /* Commands with a prefix of `thread'. */
1497 struct cmd_list_element
*thread_cmd_list
= NULL
;
1499 /* Implementation of `thread' variable. */
1501 static const struct internalvar_funcs thread_funcs
=
1503 thread_id_make_value
,
1509 _initialize_thread (void)
1511 static struct cmd_list_element
*thread_apply_list
= NULL
;
1513 add_info ("threads", info_threads_command
,
1514 _("Display currently known threads.\n\
1515 Usage: info threads [ID]...\n\
1516 Optional arguments are thread IDs with spaces between.\n\
1517 If no arguments, all threads are displayed."));
1519 add_prefix_cmd ("thread", class_run
, thread_command
, _("\
1520 Use this command to switch between threads.\n\
1521 The new thread ID must be currently known."),
1522 &thread_cmd_list
, "thread ", 1, &cmdlist
);
1524 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
1525 _("Apply a command to a list of threads."),
1526 &thread_apply_list
, "thread apply ", 1, &thread_cmd_list
);
1528 add_cmd ("all", class_run
, thread_apply_all_command
,
1529 _("Apply a command to all threads."), &thread_apply_list
);
1531 add_cmd ("name", class_run
, thread_name_command
,
1532 _("Set the current thread's name.\n\
1533 Usage: thread name [NAME]\n\
1534 If NAME is not given, then any existing name is removed."), &thread_cmd_list
);
1536 add_cmd ("find", class_run
, thread_find_command
, _("\
1537 Find threads that match a regular expression.\n\
1538 Usage: thread find REGEXP\n\
1539 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1543 add_com_alias ("t", "thread", class_run
, 1);
1545 add_setshow_boolean_cmd ("thread-events", no_class
,
1546 &print_thread_events
, _("\
1547 Set printing of thread events (such as thread start and exit)."), _("\
1548 Show printing of thread events (such as thread start and exit)."), NULL
,
1550 show_print_thread_events
,
1551 &setprintlist
, &showprintlist
);
1553 create_internalvar_type_lazy ("_thread", &thread_funcs
, NULL
);