1 /* Multi-process/thread control for GDB, the GNU debugger.
3 Copyright (C) 1986-2015 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_apply_all_command (char *, int);
66 static int thread_alive (struct thread_info
*);
67 static void info_threads_command (char *, int);
68 static void thread_apply_command (char *, int);
69 static void restore_current_thread (ptid_t
);
71 /* Data to cleanup thread array. */
73 struct thread_array_cleanup
75 /* Array of thread pointers used to set
77 struct thread_info
**tp_array
;
79 /* Thread count in the array. */
85 inferior_thread (void)
87 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
92 /* Delete the breakpoint pointed at by BP_P, if there's one. */
95 delete_thread_breakpoint (struct breakpoint
**bp_p
)
99 delete_breakpoint (*bp_p
);
105 delete_step_resume_breakpoint (struct thread_info
*tp
)
108 delete_thread_breakpoint (&tp
->control
.step_resume_breakpoint
);
112 delete_exception_resume_breakpoint (struct thread_info
*tp
)
115 delete_thread_breakpoint (&tp
->control
.exception_resume_breakpoint
);
118 /* See gdbthread.h. */
121 delete_single_step_breakpoints (struct thread_info
*tp
)
124 delete_thread_breakpoint (&tp
->control
.single_step_breakpoints
);
127 /* Delete the breakpoint pointed at by BP_P at the next stop, if
131 delete_at_next_stop (struct breakpoint
**bp
)
135 (*bp
)->disposition
= disp_del_at_next_stop
;
140 /* See gdbthread.h. */
143 thread_has_single_step_breakpoints_set (struct thread_info
*tp
)
145 return tp
->control
.single_step_breakpoints
!= NULL
;
148 /* See gdbthread.h. */
151 thread_has_single_step_breakpoint_here (struct thread_info
*tp
,
152 struct address_space
*aspace
,
155 struct breakpoint
*ss_bps
= tp
->control
.single_step_breakpoints
;
157 return (ss_bps
!= NULL
158 && breakpoint_has_location_inserted_here (ss_bps
, aspace
, addr
));
162 clear_thread_inferior_resources (struct thread_info
*tp
)
164 /* NOTE: this will take care of any left-over step_resume breakpoints,
165 but not any user-specified thread-specific breakpoints. We can not
166 delete the breakpoint straight-off, because the inferior might not
167 be stopped at the moment. */
168 delete_at_next_stop (&tp
->control
.step_resume_breakpoint
);
169 delete_at_next_stop (&tp
->control
.exception_resume_breakpoint
);
170 delete_at_next_stop (&tp
->control
.single_step_breakpoints
);
172 delete_longjmp_breakpoint_at_next_stop (tp
->num
);
174 bpstat_clear (&tp
->control
.stop_bpstat
);
176 btrace_teardown (tp
);
178 do_all_intermediate_continuations_thread (tp
, 1);
179 do_all_continuations_thread (tp
, 1);
183 free_thread (struct thread_info
*tp
)
187 if (tp
->private_dtor
)
188 tp
->private_dtor (tp
->priv
);
198 init_thread_list (void)
200 struct thread_info
*tp
, *tpnext
;
202 highest_thread_num
= 0;
207 for (tp
= thread_list
; tp
; tp
= tpnext
)
214 threads_executing
= 0;
217 /* Allocate a new thread with target id PTID and add it to the thread
220 static struct thread_info
*
221 new_thread (ptid_t ptid
)
223 struct thread_info
*tp
;
225 tp
= xcalloc (1, sizeof (*tp
));
228 tp
->num
= ++highest_thread_num
;
229 tp
->next
= thread_list
;
232 /* Nothing to follow yet. */
233 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
234 tp
->state
= THREAD_STOPPED
;
240 add_thread_silent (ptid_t ptid
)
242 struct thread_info
*tp
;
244 tp
= find_thread_ptid (ptid
);
246 /* Found an old thread with the same id. It has to be dead,
247 otherwise we wouldn't be adding a new thread with the same id.
248 The OS is reusing this id --- delete it, and recreate a new
251 /* In addition to deleting the thread, if this is the current
252 thread, then we need to take care that delete_thread doesn't
253 really delete the thread if it is inferior_ptid. Create a
254 new template thread in the list with an invalid ptid, switch
255 to it, delete the original thread, reset the new thread's
256 ptid, and switch to it. */
258 if (ptid_equal (inferior_ptid
, ptid
))
260 tp
= new_thread (null_ptid
);
262 /* Make switch_to_thread not read from the thread. */
263 tp
->state
= THREAD_EXITED
;
264 switch_to_thread (null_ptid
);
266 /* Now we can delete it. */
267 delete_thread (ptid
);
269 /* Now reset its ptid, and reswitch inferior_ptid to it. */
271 tp
->state
= THREAD_STOPPED
;
272 switch_to_thread (ptid
);
274 observer_notify_new_thread (tp
);
280 /* Just go ahead and delete it. */
281 delete_thread (ptid
);
284 tp
= new_thread (ptid
);
285 observer_notify_new_thread (tp
);
291 add_thread_with_info (ptid_t ptid
, struct private_thread_info
*priv
)
293 struct thread_info
*result
= add_thread_silent (ptid
);
297 if (print_thread_events
)
298 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid
));
300 annotate_new_thread ();
305 add_thread (ptid_t ptid
)
307 return add_thread_with_info (ptid
, NULL
);
310 /* Delete thread PTID. If SILENT, don't notify the observer of this
313 delete_thread_1 (ptid_t ptid
, int silent
)
315 struct thread_info
*tp
, *tpprev
;
319 for (tp
= thread_list
; tp
; tpprev
= tp
, tp
= tp
->next
)
320 if (ptid_equal (tp
->ptid
, ptid
))
326 /* If this is the current thread, or there's code out there that
327 relies on it existing (refcount > 0) we can't delete yet. Mark
328 it as exited, and notify it. */
330 || ptid_equal (tp
->ptid
, inferior_ptid
))
332 if (tp
->state
!= THREAD_EXITED
)
334 observer_notify_thread_exit (tp
, silent
);
336 /* Tag it as exited. */
337 tp
->state
= THREAD_EXITED
;
339 /* Clear breakpoints, etc. associated with this thread. */
340 clear_thread_inferior_resources (tp
);
343 /* Will be really deleted some other time. */
347 /* Notify thread exit, but only if we haven't already. */
348 if (tp
->state
!= THREAD_EXITED
)
349 observer_notify_thread_exit (tp
, silent
);
351 /* Tag it as exited. */
352 tp
->state
= THREAD_EXITED
;
353 clear_thread_inferior_resources (tp
);
356 tpprev
->next
= tp
->next
;
358 thread_list
= tp
->next
;
363 /* Delete thread PTID and notify of thread exit. If this is
364 inferior_ptid, don't actually delete it, but tag it as exited and
365 do the notification. If PTID is the user selected thread, clear
368 delete_thread (ptid_t ptid
)
370 delete_thread_1 (ptid
, 0 /* not silent */);
374 delete_thread_silent (ptid_t ptid
)
376 delete_thread_1 (ptid
, 1 /* silent */);
380 find_thread_id (int num
)
382 struct thread_info
*tp
;
384 for (tp
= thread_list
; tp
; tp
= tp
->next
)
391 /* Find a thread_info by matching PTID. */
393 find_thread_ptid (ptid_t ptid
)
395 struct thread_info
*tp
;
397 for (tp
= thread_list
; tp
; tp
= tp
->next
)
398 if (ptid_equal (tp
->ptid
, ptid
))
405 * Thread iterator function.
407 * Calls a callback function once for each thread, so long as
408 * the callback function returns false. If the callback function
409 * returns true, the iteration will end and the current thread
410 * will be returned. This can be useful for implementing a
411 * search for a thread with arbitrary attributes, or for applying
412 * some operation to every thread.
414 * FIXME: some of the existing functionality, such as
415 * "Thread apply all", might be rewritten using this functionality.
419 iterate_over_threads (int (*callback
) (struct thread_info
*, void *),
422 struct thread_info
*tp
, *next
;
424 for (tp
= thread_list
; tp
; tp
= next
)
427 if ((*callback
) (tp
, data
))
438 struct thread_info
*tp
;
440 for (tp
= thread_list
; tp
; tp
= tp
->next
)
447 valid_thread_id (int num
)
449 struct thread_info
*tp
;
451 for (tp
= thread_list
; tp
; tp
= tp
->next
)
459 pid_to_thread_id (ptid_t ptid
)
461 struct thread_info
*tp
;
463 for (tp
= thread_list
; tp
; tp
= tp
->next
)
464 if (ptid_equal (tp
->ptid
, ptid
))
471 thread_id_to_pid (int num
)
473 struct thread_info
*thread
= find_thread_id (num
);
478 return pid_to_ptid (-1);
482 in_thread_list (ptid_t ptid
)
484 struct thread_info
*tp
;
486 for (tp
= thread_list
; tp
; tp
= tp
->next
)
487 if (ptid_equal (tp
->ptid
, ptid
))
490 return 0; /* Never heard of 'im. */
493 /* Finds the first thread of the inferior given by PID. If PID is -1,
494 return the first thread in the list. */
497 first_thread_of_process (int pid
)
499 struct thread_info
*tp
, *ret
= NULL
;
501 for (tp
= thread_list
; tp
; tp
= tp
->next
)
502 if (pid
== -1 || ptid_get_pid (tp
->ptid
) == pid
)
503 if (ret
== NULL
|| tp
->num
< ret
->num
)
510 any_thread_of_process (int pid
)
512 struct thread_info
*tp
;
514 gdb_assert (pid
!= 0);
516 /* Prefer the current thread. */
517 if (ptid_get_pid (inferior_ptid
) == pid
)
518 return inferior_thread ();
520 ALL_NON_EXITED_THREADS (tp
)
521 if (ptid_get_pid (tp
->ptid
) == pid
)
528 any_live_thread_of_process (int pid
)
530 struct thread_info
*curr_tp
= NULL
;
531 struct thread_info
*tp
;
532 struct thread_info
*tp_executing
= NULL
;
534 gdb_assert (pid
!= 0);
536 /* Prefer the current thread if it's not executing. */
537 if (ptid_get_pid (inferior_ptid
) == pid
)
539 /* If the current thread is dead, forget it. If it's not
540 executing, use it. Otherwise, still choose it (below), but
541 only if no other non-executing thread is found. */
542 curr_tp
= inferior_thread ();
543 if (curr_tp
->state
== THREAD_EXITED
)
545 else if (!curr_tp
->executing
)
549 ALL_NON_EXITED_THREADS (tp
)
550 if (ptid_get_pid (tp
->ptid
) == pid
)
558 /* If both the current thread and all live threads are executing,
559 prefer the current thread. */
563 /* Otherwise, just return an executing thread, if any. */
567 /* Print a list of thread ids currently known, and the total number of
568 threads. To be used from within catch_errors. */
570 do_captured_list_thread_ids (struct ui_out
*uiout
, void *arg
)
572 struct thread_info
*tp
;
574 struct cleanup
*cleanup_chain
;
575 int current_thread
= -1;
577 update_thread_list ();
579 cleanup_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "thread-ids");
581 for (tp
= thread_list
; tp
; tp
= tp
->next
)
583 if (tp
->state
== THREAD_EXITED
)
586 if (ptid_equal (tp
->ptid
, inferior_ptid
))
587 current_thread
= tp
->num
;
590 ui_out_field_int (uiout
, "thread-id", tp
->num
);
593 do_cleanups (cleanup_chain
);
595 if (current_thread
!= -1)
596 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
597 ui_out_field_int (uiout
, "number-of-threads", num
);
601 /* Official gdblib interface function to get a list of thread ids and
604 gdb_list_thread_ids (struct ui_out
*uiout
, char **error_message
)
606 if (catch_exceptions_with_msg (uiout
, do_captured_list_thread_ids
, NULL
,
607 error_message
, RETURN_MASK_ALL
) < 0)
612 /* Return true if TP is an active thread. */
614 thread_alive (struct thread_info
*tp
)
616 if (tp
->state
== THREAD_EXITED
)
618 if (!target_thread_alive (tp
->ptid
))
623 /* See gdbthreads.h. */
628 struct thread_info
*tp
, *next
;
630 for (tp
= thread_list
; tp
; tp
= next
)
633 if (!thread_alive (tp
))
634 delete_thread (tp
->ptid
);
638 /* Disable storing stack temporaries for the thread whose id is
642 disable_thread_stack_temporaries (void *data
)
645 struct thread_info
*tp
= find_thread_ptid (*pd
);
649 tp
->stack_temporaries_enabled
= 0;
650 VEC_free (value_ptr
, tp
->stack_temporaries
);
656 /* Enable storing stack temporaries for thread with id PTID and return a
657 cleanup which can disable and clear the stack temporaries. */
660 enable_thread_stack_temporaries (ptid_t ptid
)
662 struct thread_info
*tp
= find_thread_ptid (ptid
);
666 gdb_assert (tp
!= NULL
);
668 tp
->stack_temporaries_enabled
= 1;
669 tp
->stack_temporaries
= NULL
;
670 data
= (ptid_t
*) xmalloc (sizeof (ptid_t
));
672 c
= make_cleanup (disable_thread_stack_temporaries
, data
);
677 /* Return non-zero value if stack temporaies are enabled for the thread
681 thread_stack_temporaries_enabled_p (ptid_t ptid
)
683 struct thread_info
*tp
= find_thread_ptid (ptid
);
688 return tp
->stack_temporaries_enabled
;
691 /* Push V on to the stack temporaries of the thread with id PTID. */
694 push_thread_stack_temporary (ptid_t ptid
, struct value
*v
)
696 struct thread_info
*tp
= find_thread_ptid (ptid
);
698 gdb_assert (tp
!= NULL
&& tp
->stack_temporaries_enabled
);
699 VEC_safe_push (value_ptr
, tp
->stack_temporaries
, v
);
702 /* Return 1 if VAL is among the stack temporaries of the thread
703 with id PTID. Return 0 otherwise. */
706 value_in_thread_stack_temporaries (struct value
*val
, ptid_t ptid
)
708 struct thread_info
*tp
= find_thread_ptid (ptid
);
710 gdb_assert (tp
!= NULL
&& tp
->stack_temporaries_enabled
);
711 if (!VEC_empty (value_ptr
, tp
->stack_temporaries
))
716 for (i
= 0; VEC_iterate (value_ptr
, tp
->stack_temporaries
, i
, v
); i
++)
724 /* Return the last of the stack temporaries for thread with id PTID.
725 Return NULL if there are no stack temporaries for the thread. */
728 get_last_thread_stack_temporary (ptid_t ptid
)
730 struct value
*lastval
= NULL
;
731 struct thread_info
*tp
= find_thread_ptid (ptid
);
733 gdb_assert (tp
!= NULL
);
734 if (!VEC_empty (value_ptr
, tp
->stack_temporaries
))
735 lastval
= VEC_last (value_ptr
, tp
->stack_temporaries
);
741 thread_change_ptid (ptid_t old_ptid
, ptid_t new_ptid
)
743 struct inferior
*inf
;
744 struct thread_info
*tp
;
746 /* It can happen that what we knew as the target inferior id
747 changes. E.g, target remote may only discover the remote process
748 pid after adding the inferior to GDB's list. */
749 inf
= find_inferior_ptid (old_ptid
);
750 inf
->pid
= ptid_get_pid (new_ptid
);
752 tp
= find_thread_ptid (old_ptid
);
755 observer_notify_thread_ptid_changed (old_ptid
, new_ptid
);
759 set_running (ptid_t ptid
, int running
)
761 struct thread_info
*tp
;
762 int all
= ptid_equal (ptid
, minus_one_ptid
);
764 /* We try not to notify the observer if no thread has actually changed
765 the running state -- merely to reduce the number of messages to
766 frontend. Frontend is supposed to handle multiple *running just fine. */
767 if (all
|| ptid_is_pid (ptid
))
771 for (tp
= thread_list
; tp
; tp
= tp
->next
)
772 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
774 if (tp
->state
== THREAD_EXITED
)
776 if (running
&& tp
->state
== THREAD_STOPPED
)
778 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
781 observer_notify_target_resumed (ptid
);
787 tp
= find_thread_ptid (ptid
);
789 gdb_assert (tp
->state
!= THREAD_EXITED
);
790 if (running
&& tp
->state
== THREAD_STOPPED
)
792 tp
->state
= running
? THREAD_RUNNING
: THREAD_STOPPED
;
794 observer_notify_target_resumed (ptid
);
799 is_thread_state (ptid_t ptid
, enum thread_state state
)
801 struct thread_info
*tp
;
803 tp
= find_thread_ptid (ptid
);
805 return tp
->state
== state
;
809 is_stopped (ptid_t ptid
)
811 return is_thread_state (ptid
, THREAD_STOPPED
);
815 is_exited (ptid_t ptid
)
817 return is_thread_state (ptid
, THREAD_EXITED
);
821 is_running (ptid_t ptid
)
823 return is_thread_state (ptid
, THREAD_RUNNING
);
827 is_executing (ptid_t ptid
)
829 struct thread_info
*tp
;
831 tp
= find_thread_ptid (ptid
);
833 return tp
->executing
;
837 set_executing (ptid_t ptid
, int executing
)
839 struct thread_info
*tp
;
840 int all
= ptid_equal (ptid
, minus_one_ptid
);
842 if (all
|| ptid_is_pid (ptid
))
844 for (tp
= thread_list
; tp
; tp
= tp
->next
)
845 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
846 tp
->executing
= executing
;
850 tp
= find_thread_ptid (ptid
);
852 tp
->executing
= executing
;
855 /* It only takes one running thread to spawn more threads.*/
857 threads_executing
= 1;
858 /* Only clear the flag if the caller is telling us everything is
860 else if (ptid_equal (minus_one_ptid
, ptid
))
861 threads_executing
= 0;
864 /* See gdbthread.h. */
867 threads_are_executing (void)
869 return threads_executing
;
873 set_stop_requested (ptid_t ptid
, int stop
)
875 struct thread_info
*tp
;
876 int all
= ptid_equal (ptid
, minus_one_ptid
);
878 if (all
|| ptid_is_pid (ptid
))
880 for (tp
= thread_list
; tp
; tp
= tp
->next
)
881 if (all
|| ptid_get_pid (tp
->ptid
) == ptid_get_pid (ptid
))
882 tp
->stop_requested
= stop
;
886 tp
= find_thread_ptid (ptid
);
888 tp
->stop_requested
= stop
;
891 /* Call the stop requested observer so other components of GDB can
892 react to this request. */
894 observer_notify_thread_stop_requested (ptid
);
898 finish_thread_state (ptid_t ptid
)
900 struct thread_info
*tp
;
904 all
= ptid_equal (ptid
, minus_one_ptid
);
906 if (all
|| ptid_is_pid (ptid
))
908 for (tp
= thread_list
; tp
; tp
= tp
->next
)
910 if (tp
->state
== THREAD_EXITED
)
912 if (all
|| ptid_get_pid (ptid
) == ptid_get_pid (tp
->ptid
))
914 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
916 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
922 tp
= find_thread_ptid (ptid
);
924 if (tp
->state
!= THREAD_EXITED
)
926 if (tp
->executing
&& tp
->state
== THREAD_STOPPED
)
928 tp
->state
= tp
->executing
? THREAD_RUNNING
: THREAD_STOPPED
;
933 observer_notify_target_resumed (ptid
);
937 finish_thread_state_cleanup (void *arg
)
939 ptid_t
*ptid_p
= arg
;
943 finish_thread_state (*ptid_p
);
947 pc_in_thread_step_range (CORE_ADDR pc
, struct thread_info
*thread
)
949 return (pc
>= thread
->control
.step_range_start
950 && pc
< thread
->control
.step_range_end
);
953 /* Prints the list of threads and their details on UIOUT.
954 This is a version of 'info_threads_command' suitable for
956 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
957 that should be printed. Otherwise, all threads are
959 If PID is not -1, only print threads from the process PID.
960 Otherwise, threads from all attached PIDs are printed.
961 If both REQUESTED_THREAD and PID are not -1, then the thread
962 is printed if it belongs to the specified process. Otherwise,
963 an error is raised. */
965 print_thread_info (struct ui_out
*uiout
, char *requested_threads
, int pid
)
967 struct thread_info
*tp
;
969 struct cleanup
*old_chain
;
970 char *extra_info
, *name
, *target_id
;
971 int current_thread
= -1;
973 update_thread_list ();
974 current_ptid
= inferior_ptid
;
976 /* We'll be switching threads temporarily. */
977 old_chain
= make_cleanup_restore_current_thread ();
979 /* For backward compatibility, we make a list for MI. A table is
980 preferable for the CLI, though, because it shows table
982 if (ui_out_is_mi_like_p (uiout
))
983 make_cleanup_ui_out_list_begin_end (uiout
, "threads");
988 for (tp
= thread_list
; tp
; tp
= tp
->next
)
990 if (!number_is_in_list (requested_threads
, tp
->num
))
993 if (pid
!= -1 && ptid_get_pid (tp
->ptid
) != pid
)
996 if (tp
->state
== THREAD_EXITED
)
1004 if (requested_threads
== NULL
|| *requested_threads
== '\0')
1005 ui_out_message (uiout
, 0, _("No threads.\n"));
1007 ui_out_message (uiout
, 0, _("No threads match '%s'.\n"),
1009 do_cleanups (old_chain
);
1013 make_cleanup_ui_out_table_begin_end (uiout
, 4, n_threads
, "threads");
1015 ui_out_table_header (uiout
, 1, ui_left
, "current", "");
1016 ui_out_table_header (uiout
, 4, ui_left
, "id", "Id");
1017 ui_out_table_header (uiout
, 17, ui_left
, "target-id", "Target Id");
1018 ui_out_table_header (uiout
, 1, ui_left
, "frame", "Frame");
1019 ui_out_table_body (uiout
);
1022 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1024 struct cleanup
*chain2
;
1027 if (!number_is_in_list (requested_threads
, tp
->num
))
1030 if (pid
!= -1 && ptid_get_pid (tp
->ptid
) != pid
)
1032 if (requested_threads
!= NULL
&& *requested_threads
!= '\0')
1033 error (_("Requested thread not found in requested process"));
1037 if (ptid_equal (tp
->ptid
, current_ptid
))
1038 current_thread
= tp
->num
;
1040 if (tp
->state
== THREAD_EXITED
)
1043 chain2
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
1045 if (ui_out_is_mi_like_p (uiout
))
1047 /* Compatibility. */
1048 if (ptid_equal (tp
->ptid
, current_ptid
))
1049 ui_out_text (uiout
, "* ");
1051 ui_out_text (uiout
, " ");
1055 if (ptid_equal (tp
->ptid
, current_ptid
))
1056 ui_out_field_string (uiout
, "current", "*");
1058 ui_out_field_skip (uiout
, "current");
1061 ui_out_field_int (uiout
, "id", tp
->num
);
1063 /* For the CLI, we stuff everything into the target-id field.
1064 This is a gross hack to make the output come out looking
1065 correct. The underlying problem here is that ui-out has no
1066 way to specify that a field's space allocation should be
1067 shared by several fields. For MI, we do the right thing
1070 target_id
= target_pid_to_str (tp
->ptid
);
1071 extra_info
= target_extra_thread_info (tp
);
1072 name
= tp
->name
? tp
->name
: target_thread_name (tp
);
1074 if (ui_out_is_mi_like_p (uiout
))
1076 ui_out_field_string (uiout
, "target-id", target_id
);
1078 ui_out_field_string (uiout
, "details", extra_info
);
1080 ui_out_field_string (uiout
, "name", name
);
1084 struct cleanup
*str_cleanup
;
1087 if (extra_info
&& name
)
1088 contents
= xstrprintf ("%s \"%s\" (%s)", target_id
,
1090 else if (extra_info
)
1091 contents
= xstrprintf ("%s (%s)", target_id
, extra_info
);
1093 contents
= xstrprintf ("%s \"%s\"", target_id
, name
);
1095 contents
= xstrdup (target_id
);
1096 str_cleanup
= make_cleanup (xfree
, contents
);
1098 ui_out_field_string (uiout
, "target-id", contents
);
1099 do_cleanups (str_cleanup
);
1102 if (tp
->state
== THREAD_RUNNING
)
1103 ui_out_text (uiout
, "(running)\n");
1106 /* The switch below puts us at the top of the stack (leaf
1108 switch_to_thread (tp
->ptid
);
1109 print_stack_frame (get_selected_frame (NULL
),
1110 /* For MI output, print frame level. */
1111 ui_out_is_mi_like_p (uiout
),
1115 if (ui_out_is_mi_like_p (uiout
))
1117 char *state
= "stopped";
1119 if (tp
->state
== THREAD_RUNNING
)
1121 ui_out_field_string (uiout
, "state", state
);
1124 core
= target_core_of_thread (tp
->ptid
);
1125 if (ui_out_is_mi_like_p (uiout
) && core
!= -1)
1126 ui_out_field_int (uiout
, "core", core
);
1128 do_cleanups (chain2
);
1131 /* Restores the current thread and the frame selected before
1132 the "info threads" command. */
1133 do_cleanups (old_chain
);
1135 if (pid
== -1 && requested_threads
== NULL
)
1137 gdb_assert (current_thread
!= -1
1139 || ptid_equal (inferior_ptid
, null_ptid
));
1140 if (current_thread
!= -1 && ui_out_is_mi_like_p (uiout
))
1141 ui_out_field_int (uiout
, "current-thread-id", current_thread
);
1143 if (current_thread
!= -1 && is_exited (current_ptid
))
1144 ui_out_message (uiout
, 0, "\n\
1145 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
1147 else if (thread_list
1148 && current_thread
== -1
1149 && ptid_equal (current_ptid
, null_ptid
))
1150 ui_out_message (uiout
, 0, "\n\
1151 No selected thread. See `help thread'.\n");
1155 /* Print information about currently known threads
1157 Optional ARG is a thread id, or list of thread ids.
1159 Note: this has the drawback that it _really_ switches
1160 threads, which frees the frame cache. A no-side
1161 effects info-threads command would be nicer. */
1164 info_threads_command (char *arg
, int from_tty
)
1166 print_thread_info (current_uiout
, arg
, -1);
1169 /* Switch from one thread to another. */
1172 switch_to_thread (ptid_t ptid
)
1174 /* Switch the program space as well, if we can infer it from the now
1175 current thread. Otherwise, it's up to the caller to select the
1177 if (!ptid_equal (ptid
, null_ptid
))
1179 struct inferior
*inf
;
1181 inf
= find_inferior_ptid (ptid
);
1182 gdb_assert (inf
!= NULL
);
1183 set_current_program_space (inf
->pspace
);
1184 set_current_inferior (inf
);
1187 if (ptid_equal (ptid
, inferior_ptid
))
1190 inferior_ptid
= ptid
;
1191 reinit_frame_cache ();
1193 /* We don't check for is_stopped, because we're called at times
1194 while in the TARGET_RUNNING state, e.g., while handling an
1196 if (!ptid_equal (inferior_ptid
, null_ptid
)
1197 && !is_exited (ptid
)
1198 && !is_executing (ptid
))
1199 stop_pc
= regcache_read_pc (get_thread_regcache (ptid
));
1201 stop_pc
= ~(CORE_ADDR
) 0;
1205 restore_current_thread (ptid_t ptid
)
1207 switch_to_thread (ptid
);
1211 restore_selected_frame (struct frame_id a_frame_id
, int frame_level
)
1213 struct frame_info
*frame
= NULL
;
1216 /* This means there was no selected frame. */
1217 if (frame_level
== -1)
1219 select_frame (NULL
);
1223 gdb_assert (frame_level
>= 0);
1225 /* Restore by level first, check if the frame id is the same as
1226 expected. If that fails, try restoring by frame id. If that
1227 fails, nothing to do, just warn the user. */
1229 count
= frame_level
;
1230 frame
= find_relative_frame (get_current_frame (), &count
);
1233 /* The frame ids must match - either both valid or both outer_frame_id.
1234 The latter case is not failsafe, but since it's highly unlikely
1235 the search by level finds the wrong frame, it's 99.9(9)% of
1236 the time (for all practical purposes) safe. */
1237 && frame_id_eq (get_frame_id (frame
), a_frame_id
))
1239 /* Cool, all is fine. */
1240 select_frame (frame
);
1244 frame
= frame_find_by_id (a_frame_id
);
1247 /* Cool, refound it. */
1248 select_frame (frame
);
1252 /* Nothing else to do, the frame layout really changed. Select the
1253 innermost stack frame. */
1254 select_frame (get_current_frame ());
1256 /* Warn the user. */
1257 if (frame_level
> 0 && !ui_out_is_mi_like_p (current_uiout
))
1259 warning (_("Couldn't restore frame #%d in "
1260 "current thread. Bottom (innermost) frame selected:"),
1262 /* For MI, we should probably have a notification about
1263 current frame change. But this error is not very
1264 likely, so don't bother for now. */
1265 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1269 struct current_thread_cleanup
1271 ptid_t inferior_ptid
;
1272 struct frame_id selected_frame_id
;
1273 int selected_frame_level
;
1280 do_restore_current_thread_cleanup (void *arg
)
1282 struct thread_info
*tp
;
1283 struct current_thread_cleanup
*old
= arg
;
1285 tp
= find_thread_ptid (old
->inferior_ptid
);
1287 /* If the previously selected thread belonged to a process that has
1288 in the mean time been deleted (due to normal exit, detach, etc.),
1289 then don't revert back to it, but instead simply drop back to no
1292 && find_inferior_ptid (tp
->ptid
) != NULL
)
1293 restore_current_thread (old
->inferior_ptid
);
1296 restore_current_thread (null_ptid
);
1297 set_current_inferior (find_inferior_id (old
->inf_id
));
1300 /* The running state of the originally selected thread may have
1301 changed, so we have to recheck it here. */
1302 if (!ptid_equal (inferior_ptid
, null_ptid
)
1304 && is_stopped (inferior_ptid
)
1305 && target_has_registers
1307 && target_has_memory
)
1308 restore_selected_frame (old
->selected_frame_id
,
1309 old
->selected_frame_level
);
1313 restore_current_thread_cleanup_dtor (void *arg
)
1315 struct current_thread_cleanup
*old
= arg
;
1316 struct thread_info
*tp
;
1317 struct inferior
*inf
;
1319 tp
= find_thread_ptid (old
->inferior_ptid
);
1322 inf
= find_inferior_id (old
->inf_id
);
1324 inf
->removable
= old
->was_removable
;
1328 /* Set the thread reference count. */
1331 set_thread_refcount (void *data
)
1334 struct thread_array_cleanup
*ta_cleanup
= data
;
1336 for (k
= 0; k
!= ta_cleanup
->count
; k
++)
1337 ta_cleanup
->tp_array
[k
]->refcount
--;
1341 make_cleanup_restore_current_thread (void)
1343 struct thread_info
*tp
;
1344 struct frame_info
*frame
;
1345 struct current_thread_cleanup
*old
;
1347 old
= xmalloc (sizeof (struct current_thread_cleanup
));
1348 old
->inferior_ptid
= inferior_ptid
;
1349 old
->inf_id
= current_inferior ()->num
;
1350 old
->was_removable
= current_inferior ()->removable
;
1352 if (!ptid_equal (inferior_ptid
, null_ptid
))
1354 old
->was_stopped
= is_stopped (inferior_ptid
);
1355 if (old
->was_stopped
1356 && target_has_registers
1358 && target_has_memory
)
1360 /* When processing internal events, there might not be a
1361 selected frame. If we naively call get_selected_frame
1362 here, then we can end up reading debuginfo for the
1363 current frame, but we don't generally need the debuginfo
1365 frame
= get_selected_frame_if_set ();
1370 old
->selected_frame_id
= get_frame_id (frame
);
1371 old
->selected_frame_level
= frame_relative_level (frame
);
1373 tp
= find_thread_ptid (inferior_ptid
);
1378 current_inferior ()->removable
= 0;
1380 return make_cleanup_dtor (do_restore_current_thread_cleanup
, old
,
1381 restore_current_thread_cleanup_dtor
);
1384 /* If non-zero tp_array_compar should sort in ascending order, otherwise in
1385 descending order. */
1387 static int tp_array_compar_ascending
;
1389 /* Sort an array for struct thread_info pointers by their NUM, order is
1390 determined by TP_ARRAY_COMPAR_ASCENDING. */
1393 tp_array_compar (const void *ap_voidp
, const void *bp_voidp
)
1395 const struct thread_info
*const *ap
= ap_voidp
;
1396 const struct thread_info
*const *bp
= bp_voidp
;
1398 return ((((*ap
)->num
> (*bp
)->num
) - ((*ap
)->num
< (*bp
)->num
))
1399 * (tp_array_compar_ascending
? +1 : -1));
1402 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1403 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1404 of two numbers seperated by a hyphen. Examples:
1406 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1407 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1408 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1411 thread_apply_all_command (char *cmd
, int from_tty
)
1413 struct cleanup
*old_chain
;
1416 struct thread_array_cleanup ta_cleanup
;
1418 tp_array_compar_ascending
= 0;
1420 && check_for_argument (&cmd
, "-ascending", strlen ("-ascending")))
1422 cmd
= skip_spaces (cmd
);
1423 tp_array_compar_ascending
= 1;
1426 if (cmd
== NULL
|| *cmd
== '\000')
1427 error (_("Please specify a command following the thread ID list"));
1429 update_thread_list ();
1431 old_chain
= make_cleanup_restore_current_thread ();
1433 /* Save a copy of the command in case it is clobbered by
1435 saved_cmd
= xstrdup (cmd
);
1436 make_cleanup (xfree
, saved_cmd
);
1437 tc
= thread_count ();
1441 struct thread_info
**tp_array
;
1442 struct thread_info
*tp
;
1445 /* Save a copy of the thread_list in case we execute detach
1447 tp_array
= xmalloc (sizeof (struct thread_info
*) * tc
);
1448 make_cleanup (xfree
, tp_array
);
1449 ta_cleanup
.tp_array
= tp_array
;
1450 ta_cleanup
.count
= tc
;
1452 ALL_NON_EXITED_THREADS (tp
)
1459 qsort (tp_array
, i
, sizeof (*tp_array
), tp_array_compar
);
1461 make_cleanup (set_thread_refcount
, &ta_cleanup
);
1463 for (k
= 0; k
!= i
; k
++)
1464 if (thread_alive (tp_array
[k
]))
1466 switch_to_thread (tp_array
[k
]->ptid
);
1467 printf_filtered (_("\nThread %d (%s):\n"),
1469 target_pid_to_str (inferior_ptid
));
1470 execute_command (cmd
, from_tty
);
1472 /* Restore exact command used previously. */
1473 strcpy (cmd
, saved_cmd
);
1477 do_cleanups (old_chain
);
1481 thread_apply_command (char *tidlist
, int from_tty
)
1484 struct cleanup
*old_chain
;
1486 struct get_number_or_range_state state
;
1488 if (tidlist
== NULL
|| *tidlist
== '\000')
1489 error (_("Please specify a thread ID list"));
1491 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
1494 error (_("Please specify a command following the thread ID list"));
1496 /* Save a copy of the command in case it is clobbered by
1498 saved_cmd
= xstrdup (cmd
);
1499 old_chain
= make_cleanup (xfree
, saved_cmd
);
1501 init_number_or_range (&state
, tidlist
);
1502 while (!state
.finished
&& state
.string
< cmd
)
1504 struct thread_info
*tp
;
1507 start
= get_number_or_range (&state
);
1509 make_cleanup_restore_current_thread ();
1511 tp
= find_thread_id (start
);
1514 warning (_("Unknown thread %d."), start
);
1515 else if (!thread_alive (tp
))
1516 warning (_("Thread %d has terminated."), start
);
1519 switch_to_thread (tp
->ptid
);
1521 printf_filtered (_("\nThread %d (%s):\n"), tp
->num
,
1522 target_pid_to_str (inferior_ptid
));
1523 execute_command (cmd
, from_tty
);
1525 /* Restore exact command used previously. */
1526 strcpy (cmd
, saved_cmd
);
1530 do_cleanups (old_chain
);
1533 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1534 if prefix of arg is `apply'. */
1537 thread_command (char *tidstr
, int from_tty
)
1541 if (ptid_equal (inferior_ptid
, null_ptid
))
1542 error (_("No thread selected"));
1544 if (target_has_stack
)
1546 if (is_exited (inferior_ptid
))
1547 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1548 pid_to_thread_id (inferior_ptid
),
1549 target_pid_to_str (inferior_ptid
));
1551 printf_filtered (_("[Current thread is %d (%s)]\n"),
1552 pid_to_thread_id (inferior_ptid
),
1553 target_pid_to_str (inferior_ptid
));
1556 error (_("No stack."));
1560 gdb_thread_select (current_uiout
, tidstr
, NULL
);
1563 /* Implementation of `thread name'. */
1566 thread_name_command (char *arg
, int from_tty
)
1568 struct thread_info
*info
;
1570 if (ptid_equal (inferior_ptid
, null_ptid
))
1571 error (_("No thread selected"));
1573 arg
= skip_spaces (arg
);
1575 info
= inferior_thread ();
1577 info
->name
= arg
? xstrdup (arg
) : NULL
;
1580 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1583 thread_find_command (char *arg
, int from_tty
)
1585 struct thread_info
*tp
;
1587 unsigned long match
= 0;
1589 if (arg
== NULL
|| *arg
== '\0')
1590 error (_("Command requires an argument."));
1592 tmp
= re_comp (arg
);
1594 error (_("Invalid regexp (%s): %s"), tmp
, arg
);
1596 update_thread_list ();
1597 for (tp
= thread_list
; tp
; tp
= tp
->next
)
1599 if (tp
->name
!= NULL
&& re_exec (tp
->name
))
1601 printf_filtered (_("Thread %d has name '%s'\n"),
1606 tmp
= target_thread_name (tp
);
1607 if (tmp
!= NULL
&& re_exec (tmp
))
1609 printf_filtered (_("Thread %d has target name '%s'\n"),
1614 tmp
= target_pid_to_str (tp
->ptid
);
1615 if (tmp
!= NULL
&& re_exec (tmp
))
1617 printf_filtered (_("Thread %d has target id '%s'\n"),
1622 tmp
= target_extra_thread_info (tp
);
1623 if (tmp
!= NULL
&& re_exec (tmp
))
1625 printf_filtered (_("Thread %d has extra info '%s'\n"),
1631 printf_filtered (_("No threads match '%s'\n"), arg
);
1634 /* Print notices when new threads are attached and detached. */
1635 int print_thread_events
= 1;
1637 show_print_thread_events (struct ui_file
*file
, int from_tty
,
1638 struct cmd_list_element
*c
, const char *value
)
1640 fprintf_filtered (file
,
1641 _("Printing of thread events is %s.\n"),
1646 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
1649 struct thread_info
*tp
;
1651 num
= value_as_long (parse_and_eval (tidstr
));
1653 tp
= find_thread_id (num
);
1656 error (_("Thread ID %d not known."), num
);
1658 if (!thread_alive (tp
))
1659 error (_("Thread ID %d has terminated."), num
);
1661 switch_to_thread (tp
->ptid
);
1663 annotate_thread_changed ();
1665 ui_out_text (uiout
, "[Switching to thread ");
1666 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
1667 ui_out_text (uiout
, " (");
1668 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
1669 ui_out_text (uiout
, ")]");
1671 /* Note that we can't reach this with an exited thread, due to the
1672 thread_alive check above. */
1673 if (tp
->state
== THREAD_RUNNING
)
1674 ui_out_text (uiout
, "(running)\n");
1677 ui_out_text (uiout
, "\n");
1678 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
, 1);
1681 /* Since the current thread may have changed, see if there is any
1682 exited thread we can now delete. */
1689 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
, char **error_message
)
1691 if (catch_exceptions_with_msg (uiout
, do_captured_thread_select
, tidstr
,
1692 error_message
, RETURN_MASK_ALL
) < 0)
1697 /* Update the 'threads_executing' global based on the threads we know
1701 update_threads_executing (void)
1703 struct thread_info
*tp
;
1705 threads_executing
= 0;
1706 ALL_NON_EXITED_THREADS (tp
)
1710 threads_executing
= 1;
1717 update_thread_list (void)
1719 target_update_thread_list ();
1720 update_threads_executing ();
1723 /* Return a new value for the selected thread's id. Return a value of 0 if
1724 no thread is selected, or no threads exist. */
1726 static struct value
*
1727 thread_id_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
1730 struct thread_info
*tp
= find_thread_ptid (inferior_ptid
);
1732 return value_from_longest (builtin_type (gdbarch
)->builtin_int
,
1733 (tp
? tp
->num
: 0));
1736 /* Commands with a prefix of `thread'. */
1737 struct cmd_list_element
*thread_cmd_list
= NULL
;
1739 /* Implementation of `thread' variable. */
1741 static const struct internalvar_funcs thread_funcs
=
1743 thread_id_make_value
,
1749 _initialize_thread (void)
1751 static struct cmd_list_element
*thread_apply_list
= NULL
;
1753 add_info ("threads", info_threads_command
,
1754 _("Display currently known threads.\n\
1755 Usage: info threads [ID]...\n\
1756 Optional arguments are thread IDs with spaces between.\n\
1757 If no arguments, all threads are displayed."));
1759 add_prefix_cmd ("thread", class_run
, thread_command
, _("\
1760 Use this command to switch between threads.\n\
1761 The new thread ID must be currently known."),
1762 &thread_cmd_list
, "thread ", 1, &cmdlist
);
1764 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
1765 _("Apply a command to a list of threads."),
1766 &thread_apply_list
, "thread apply ", 1, &thread_cmd_list
);
1768 add_cmd ("all", class_run
, thread_apply_all_command
,
1770 Apply a command to all threads.\n\
1772 Usage: thread apply all [-ascending] <command>\n\
1773 -ascending: Call <command> for all threads in ascending order.\n\
1774 The default is descending order.\
1776 &thread_apply_list
);
1778 add_cmd ("name", class_run
, thread_name_command
,
1779 _("Set the current thread's name.\n\
1780 Usage: thread name [NAME]\n\
1781 If NAME is not given, then any existing name is removed."), &thread_cmd_list
);
1783 add_cmd ("find", class_run
, thread_find_command
, _("\
1784 Find threads that match a regular expression.\n\
1785 Usage: thread find REGEXP\n\
1786 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1790 add_com_alias ("t", "thread", class_run
, 1);
1792 add_setshow_boolean_cmd ("thread-events", no_class
,
1793 &print_thread_events
, _("\
1794 Set printing of thread events (such as thread start and exit)."), _("\
1795 Show printing of thread events (such as thread start and exit)."), NULL
,
1797 show_print_thread_events
,
1798 &setprintlist
, &showprintlist
);
1800 create_internalvar_type_lazy ("_thread", &thread_funcs
, NULL
);