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"
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);
68 /* Data to cleanup thread array. */
70 struct thread_array_cleanup
72 /* Array of thread pointers used to set
74 struct thread_info **tp_array;
76 /* Thread count in the array. */
82 inferior_thread (void)
84 struct thread_info *tp = find_thread_ptid (inferior_ptid);
90 delete_step_resume_breakpoint (struct thread_info *tp)
92 if (tp && tp->control.step_resume_breakpoint)
94 delete_breakpoint (tp->control.step_resume_breakpoint);
95 tp->control.step_resume_breakpoint = NULL;
100 delete_exception_resume_breakpoint (struct thread_info *tp)
102 if (tp && tp->control.exception_resume_breakpoint)
104 delete_breakpoint (tp->control.exception_resume_breakpoint);
105 tp->control.exception_resume_breakpoint = NULL;
110 clear_thread_inferior_resources (struct thread_info *tp)
112 /* NOTE: this will take care of any left-over step_resume breakpoints,
113 but not any user-specified thread-specific breakpoints. We can not
114 delete the breakpoint straight-off, because the inferior might not
115 be stopped at the moment. */
116 if (tp->control.step_resume_breakpoint)
118 tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop;
119 tp->control.step_resume_breakpoint = NULL;
122 if (tp->control.exception_resume_breakpoint)
124 tp->control.exception_resume_breakpoint->disposition
125 = disp_del_at_next_stop;
126 tp->control.exception_resume_breakpoint = NULL;
129 delete_longjmp_breakpoint_at_next_stop (tp->num);
131 bpstat_clear (&tp->control.stop_bpstat);
133 btrace_teardown (tp);
135 do_all_intermediate_continuations_thread (tp, 1);
136 do_all_continuations_thread (tp, 1);
140 free_thread (struct thread_info *tp)
144 if (tp->private_dtor)
145 tp->private_dtor (tp->private);
155 init_thread_list (void)
157 struct thread_info *tp, *tpnext;
159 highest_thread_num = 0;
164 for (tp = thread_list; tp; tp = tpnext)
173 /* Allocate a new thread with target id PTID and add it to the thread
176 static struct thread_info *
177 new_thread (ptid_t ptid)
179 struct thread_info *tp;
181 tp = xcalloc (1, sizeof (*tp));
184 tp->num = ++highest_thread_num;
185 tp->next = thread_list;
188 /* Nothing to follow yet. */
189 tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
190 tp->state = THREAD_STOPPED;
196 add_thread_silent (ptid_t ptid)
198 struct thread_info *tp;
200 tp = find_thread_ptid (ptid);
202 /* Found an old thread with the same id. It has to be dead,
203 otherwise we wouldn't be adding a new thread with the same id.
204 The OS is reusing this id --- delete it, and recreate a new
207 /* In addition to deleting the thread, if this is the current
208 thread, then we need to take care that delete_thread doesn't
209 really delete the thread if it is inferior_ptid. Create a
210 new template thread in the list with an invalid ptid, switch
211 to it, delete the original thread, reset the new thread's
212 ptid, and switch to it. */
214 if (ptid_equal (inferior_ptid, ptid))
216 tp = new_thread (null_ptid);
218 /* Make switch_to_thread not read from the thread. */
219 tp->state = THREAD_EXITED;
220 switch_to_thread (null_ptid);
222 /* Now we can delete it. */
223 delete_thread (ptid);
225 /* Now reset its ptid, and reswitch inferior_ptid to it. */
227 tp->state = THREAD_STOPPED;
228 switch_to_thread (ptid);
230 observer_notify_new_thread (tp);
236 /* Just go ahead and delete it. */
237 delete_thread (ptid);
240 tp = new_thread (ptid);
241 observer_notify_new_thread (tp);
247 add_thread_with_info (ptid_t ptid, struct private_thread_info *private)
249 struct thread_info *result = add_thread_silent (ptid);
251 result->private = private;
253 if (print_thread_events)
254 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
256 annotate_new_thread ();
261 add_thread (ptid_t ptid)
263 return add_thread_with_info (ptid, NULL);
266 /* Delete thread PTID. If SILENT, don't notify the observer of this
269 delete_thread_1 (ptid_t ptid, int silent)
271 struct thread_info *tp, *tpprev;
275 for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
276 if (ptid_equal (tp->ptid, ptid))
282 /* If this is the current thread, or there's code out there that
283 relies on it existing (refcount > 0) we can't delete yet. Mark
284 it as exited, and notify it. */
286 || ptid_equal (tp->ptid, inferior_ptid))
288 if (tp->state != THREAD_EXITED)
290 observer_notify_thread_exit (tp, silent);
292 /* Tag it as exited. */
293 tp->state = THREAD_EXITED;
295 /* Clear breakpoints, etc. associated with this thread. */
296 clear_thread_inferior_resources (tp);
299 /* Will be really deleted some other time. */
303 /* Notify thread exit, but only if we haven't already. */
304 if (tp->state != THREAD_EXITED)
305 observer_notify_thread_exit (tp, silent);
307 /* Tag it as exited. */
308 tp->state = THREAD_EXITED;
309 clear_thread_inferior_resources (tp);
312 tpprev->next = tp->next;
314 thread_list = tp->next;
319 /* Delete thread PTID and notify of thread exit. If this is
320 inferior_ptid, don't actually delete it, but tag it as exited and
321 do the notification. If PTID is the user selected thread, clear
324 delete_thread (ptid_t ptid)
326 delete_thread_1 (ptid, 0 /* not silent */);
330 delete_thread_silent (ptid_t ptid)
332 delete_thread_1 (ptid, 1 /* silent */);
336 find_thread_id (int num)
338 struct thread_info *tp;
340 for (tp = thread_list; tp; tp = tp->next)
347 /* Find a thread_info by matching PTID. */
349 find_thread_ptid (ptid_t ptid)
351 struct thread_info *tp;
353 for (tp = thread_list; tp; tp = tp->next)
354 if (ptid_equal (tp->ptid, ptid))
361 * Thread iterator function.
363 * Calls a callback function once for each thread, so long as
364 * the callback function returns false. If the callback function
365 * returns true, the iteration will end and the current thread
366 * will be returned. This can be useful for implementing a
367 * search for a thread with arbitrary attributes, or for applying
368 * some operation to every thread.
370 * FIXME: some of the existing functionality, such as
371 * "Thread apply all", might be rewritten using this functionality.
375 iterate_over_threads (int (*callback) (struct thread_info *, void *),
378 struct thread_info *tp, *next;
380 for (tp = thread_list; tp; tp = next)
383 if ((*callback) (tp, data))
394 struct thread_info *tp;
396 for (tp = thread_list; tp; tp = tp->next)
403 valid_thread_id (int num)
405 struct thread_info *tp;
407 for (tp = thread_list; tp; tp = tp->next)
415 pid_to_thread_id (ptid_t ptid)
417 struct thread_info *tp;
419 for (tp = thread_list; tp; tp = tp->next)
420 if (ptid_equal (tp->ptid, ptid))
427 thread_id_to_pid (int num)
429 struct thread_info *thread = find_thread_id (num);
434 return pid_to_ptid (-1);
438 in_thread_list (ptid_t ptid)
440 struct thread_info *tp;
442 for (tp = thread_list; tp; tp = tp->next)
443 if (ptid_equal (tp->ptid, ptid))
446 return 0; /* Never heard of 'im. */
449 /* Finds the first thread of the inferior given by PID. If PID is -1,
450 return the first thread in the list. */
453 first_thread_of_process (int pid)
455 struct thread_info *tp, *ret = NULL;
457 for (tp = thread_list; tp; tp = tp->next)
458 if (pid == -1 || ptid_get_pid (tp->ptid) == pid)
459 if (ret == NULL || tp->num < ret->num)
466 any_thread_of_process (int pid)
468 struct thread_info *tp;
470 for (tp = thread_list; tp; tp = tp->next)
471 if (ptid_get_pid (tp->ptid) == pid)
478 any_live_thread_of_process (int pid)
480 struct thread_info *tp;
481 struct thread_info *tp_executing = NULL;
483 for (tp = thread_list; tp; tp = tp->next)
484 if (tp->state != THREAD_EXITED && ptid_get_pid (tp->ptid) == pid)
495 /* Print a list of thread ids currently known, and the total number of
496 threads. To be used from within catch_errors. */
498 do_captured_list_thread_ids (struct ui_out *uiout, void *arg)
500 struct thread_info *tp;
502 struct cleanup *cleanup_chain;
503 int current_thread = -1;
505 update_thread_list ();
507 cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");
509 for (tp = thread_list; tp; tp = tp->next)
511 if (tp->state == THREAD_EXITED)
514 if (ptid_equal (tp->ptid, inferior_ptid))
515 current_thread = tp->num;
518 ui_out_field_int (uiout, "thread-id", tp->num);
521 do_cleanups (cleanup_chain);
523 if (current_thread != -1)
524 ui_out_field_int (uiout, "current-thread-id", current_thread);
525 ui_out_field_int (uiout, "number-of-threads", num);
529 /* Official gdblib interface function to get a list of thread ids and
532 gdb_list_thread_ids (struct ui_out *uiout, char **error_message)
534 if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
535 error_message, RETURN_MASK_ALL) < 0)
540 /* Return true if TP is an active thread. */
542 thread_alive (struct thread_info *tp)
544 if (tp->state == THREAD_EXITED)
546 if (!target_thread_alive (tp->ptid))
554 struct thread_info *tp, *next;
556 for (tp = thread_list; tp; tp = next)
559 if (!thread_alive (tp))
560 delete_thread (tp->ptid);
565 thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid)
567 struct inferior *inf;
568 struct thread_info *tp;
570 /* It can happen that what we knew as the target inferior id
571 changes. E.g, target remote may only discover the remote process
572 pid after adding the inferior to GDB's list. */
573 inf = find_inferior_pid (ptid_get_pid (old_ptid));
574 inf->pid = ptid_get_pid (new_ptid);
576 tp = find_thread_ptid (old_ptid);
579 observer_notify_thread_ptid_changed (old_ptid, new_ptid);
583 set_running (ptid_t ptid, int running)
585 struct thread_info *tp;
586 int all = ptid_equal (ptid, minus_one_ptid);
588 /* We try not to notify the observer if no thread has actually changed
589 the running state -- merely to reduce the number of messages to
590 frontend. Frontend is supposed to handle multiple *running just fine. */
591 if (all || ptid_is_pid (ptid))
595 for (tp = thread_list; tp; tp = tp->next)
596 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
598 if (tp->state == THREAD_EXITED)
600 if (running && tp->state == THREAD_STOPPED)
602 tp->state = running ? THREAD_RUNNING : THREAD_STOPPED;
605 observer_notify_target_resumed (ptid);
611 tp = find_thread_ptid (ptid);
613 gdb_assert (tp->state != THREAD_EXITED);
614 if (running && tp->state == THREAD_STOPPED)
616 tp->state = running ? THREAD_RUNNING : THREAD_STOPPED;
618 observer_notify_target_resumed (ptid);
623 is_thread_state (ptid_t ptid, enum thread_state state)
625 struct thread_info *tp;
627 tp = find_thread_ptid (ptid);
629 return tp->state == state;
633 is_stopped (ptid_t ptid)
635 return is_thread_state (ptid, THREAD_STOPPED);
639 is_exited (ptid_t ptid)
641 return is_thread_state (ptid, THREAD_EXITED);
645 is_running (ptid_t ptid)
647 return is_thread_state (ptid, THREAD_RUNNING);
651 is_executing (ptid_t ptid)
653 struct thread_info *tp;
655 tp = find_thread_ptid (ptid);
657 return tp->executing;
661 set_executing (ptid_t ptid, int executing)
663 struct thread_info *tp;
664 int all = ptid_equal (ptid, minus_one_ptid);
666 if (all || ptid_is_pid (ptid))
668 for (tp = thread_list; tp; tp = tp->next)
669 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
670 tp->executing = executing;
674 tp = find_thread_ptid (ptid);
676 tp->executing = executing;
681 set_stop_requested (ptid_t ptid, int stop)
683 struct thread_info *tp;
684 int all = ptid_equal (ptid, minus_one_ptid);
686 if (all || ptid_is_pid (ptid))
688 for (tp = thread_list; tp; tp = tp->next)
689 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
690 tp->stop_requested = stop;
694 tp = find_thread_ptid (ptid);
696 tp->stop_requested = stop;
699 /* Call the stop requested observer so other components of GDB can
700 react to this request. */
702 observer_notify_thread_stop_requested (ptid);
706 finish_thread_state (ptid_t ptid)
708 struct thread_info *tp;
712 all = ptid_equal (ptid, minus_one_ptid);
714 if (all || ptid_is_pid (ptid))
716 for (tp = thread_list; tp; tp = tp->next)
718 if (tp->state == THREAD_EXITED)
720 if (all || ptid_get_pid (ptid) == ptid_get_pid (tp->ptid))
722 if (tp->executing && tp->state == THREAD_STOPPED)
724 tp->state = tp->executing ? THREAD_RUNNING : THREAD_STOPPED;
730 tp = find_thread_ptid (ptid);
732 if (tp->state != THREAD_EXITED)
734 if (tp->executing && tp->state == THREAD_STOPPED)
736 tp->state = tp->executing ? THREAD_RUNNING : THREAD_STOPPED;
741 observer_notify_target_resumed (ptid);
745 finish_thread_state_cleanup (void *arg)
747 ptid_t *ptid_p = arg;
751 finish_thread_state (*ptid_p);
755 pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread)
757 return (pc >= thread->control.step_range_start
758 && pc < thread->control.step_range_end);
761 /* Prints the list of threads and their details on UIOUT.
762 This is a version of 'info_threads_command' suitable for
764 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
765 that should be printed. Otherwise, all threads are
767 If PID is not -1, only print threads from the process PID.
768 Otherwise, threads from all attached PIDs are printed.
769 If both REQUESTED_THREAD and PID are not -1, then the thread
770 is printed if it belongs to the specified process. Otherwise,
771 an error is raised. */
773 print_thread_info (struct ui_out *uiout, char *requested_threads, int pid)
775 struct thread_info *tp;
777 struct cleanup *old_chain;
778 char *extra_info, *name, *target_id;
779 int current_thread = -1;
781 update_thread_list ();
782 current_ptid = inferior_ptid;
784 /* We'll be switching threads temporarily. */
785 old_chain = make_cleanup_restore_current_thread ();
787 /* For backward compatibility, we make a list for MI. A table is
788 preferable for the CLI, though, because it shows table
790 if (ui_out_is_mi_like_p (uiout))
791 make_cleanup_ui_out_list_begin_end (uiout, "threads");
796 for (tp = thread_list; tp; tp = tp->next)
798 if (!number_is_in_list (requested_threads, tp->num))
801 if (pid != -1 && ptid_get_pid (tp->ptid) != pid)
804 if (tp->state == THREAD_EXITED)
812 if (requested_threads == NULL || *requested_threads == '\0')
813 ui_out_message (uiout, 0, _("No threads.\n"));
815 ui_out_message (uiout, 0, _("No threads match '%s'.\n"),
817 do_cleanups (old_chain);
821 make_cleanup_ui_out_table_begin_end (uiout, 4, n_threads, "threads");
823 ui_out_table_header (uiout, 1, ui_left, "current", "");
824 ui_out_table_header (uiout, 4, ui_left, "id", "Id");
825 ui_out_table_header (uiout, 17, ui_left, "target-id", "Target Id");
826 ui_out_table_header (uiout, 1, ui_left, "frame", "Frame");
827 ui_out_table_body (uiout);
830 for (tp = thread_list; tp; tp = tp->next)
832 struct cleanup *chain2;
835 if (!number_is_in_list (requested_threads, tp->num))
838 if (pid != -1 && ptid_get_pid (tp->ptid) != pid)
840 if (requested_threads != NULL && *requested_threads != '\0')
841 error (_("Requested thread not found in requested process"));
845 if (ptid_equal (tp->ptid, current_ptid))
846 current_thread = tp->num;
848 if (tp->state == THREAD_EXITED)
851 chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
853 if (ui_out_is_mi_like_p (uiout))
856 if (ptid_equal (tp->ptid, current_ptid))
857 ui_out_text (uiout, "* ");
859 ui_out_text (uiout, " ");
863 if (ptid_equal (tp->ptid, current_ptid))
864 ui_out_field_string (uiout, "current", "*");
866 ui_out_field_skip (uiout, "current");
869 ui_out_field_int (uiout, "id", tp->num);
871 /* For the CLI, we stuff everything into the target-id field.
872 This is a gross hack to make the output come out looking
873 correct. The underlying problem here is that ui-out has no
874 way to specify that a field's space allocation should be
875 shared by several fields. For MI, we do the right thing
878 target_id = target_pid_to_str (tp->ptid);
879 extra_info = target_extra_thread_info (tp);
880 name = tp->name ? tp->name : target_thread_name (tp);
882 if (ui_out_is_mi_like_p (uiout))
884 ui_out_field_string (uiout, "target-id", target_id);
886 ui_out_field_string (uiout, "details", extra_info);
888 ui_out_field_string (uiout, "name", name);
892 struct cleanup *str_cleanup;
895 if (extra_info && name)
896 contents = xstrprintf ("%s \"%s\" (%s)", target_id,
899 contents = xstrprintf ("%s (%s)", target_id, extra_info);
901 contents = xstrprintf ("%s \"%s\"", target_id, name);
903 contents = xstrdup (target_id);
904 str_cleanup = make_cleanup (xfree, contents);
906 ui_out_field_string (uiout, "target-id", contents);
907 do_cleanups (str_cleanup);
910 if (tp->state == THREAD_RUNNING)
911 ui_out_text (uiout, "(running)\n");
914 /* The switch below puts us at the top of the stack (leaf
916 switch_to_thread (tp->ptid);
917 print_stack_frame (get_selected_frame (NULL),
918 /* For MI output, print frame level. */
919 ui_out_is_mi_like_p (uiout),
923 if (ui_out_is_mi_like_p (uiout))
925 char *state = "stopped";
927 if (tp->state == THREAD_RUNNING)
929 ui_out_field_string (uiout, "state", state);
932 core = target_core_of_thread (tp->ptid);
933 if (ui_out_is_mi_like_p (uiout) && core != -1)
934 ui_out_field_int (uiout, "core", core);
936 do_cleanups (chain2);
939 /* Restores the current thread and the frame selected before
940 the "info threads" command. */
941 do_cleanups (old_chain);
943 if (pid == -1 && requested_threads == NULL)
945 gdb_assert (current_thread != -1
947 || ptid_equal (inferior_ptid, null_ptid));
948 if (current_thread != -1 && ui_out_is_mi_like_p (uiout))
949 ui_out_field_int (uiout, "current-thread-id", current_thread);
951 if (current_thread != -1 && is_exited (current_ptid))
952 ui_out_message (uiout, 0, "\n\
953 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
956 && current_thread == -1
957 && ptid_equal (current_ptid, null_ptid))
958 ui_out_message (uiout, 0, "\n\
959 No selected thread. See `help thread'.\n");
963 /* Print information about currently known threads
965 Optional ARG is a thread id, or list of thread ids.
967 Note: this has the drawback that it _really_ switches
968 threads, which frees the frame cache. A no-side
969 effects info-threads command would be nicer. */
972 info_threads_command (char *arg, int from_tty)
974 print_thread_info (current_uiout, arg, -1);
977 /* Switch from one thread to another. */
980 switch_to_thread (ptid_t ptid)
982 /* Switch the program space as well, if we can infer it from the now
983 current thread. Otherwise, it's up to the caller to select the
985 if (!ptid_equal (ptid, null_ptid))
987 struct inferior *inf;
989 inf = find_inferior_pid (ptid_get_pid (ptid));
990 gdb_assert (inf != NULL);
991 set_current_program_space (inf->pspace);
992 set_current_inferior (inf);
995 if (ptid_equal (ptid, inferior_ptid))
998 inferior_ptid = ptid;
999 reinit_frame_cache ();
1001 /* We don't check for is_stopped, because we're called at times
1002 while in the TARGET_RUNNING state, e.g., while handling an
1004 if (!ptid_equal (inferior_ptid, null_ptid)
1005 && !is_exited (ptid)
1006 && !is_executing (ptid))
1007 stop_pc = regcache_read_pc (get_thread_regcache (ptid));
1009 stop_pc = ~(CORE_ADDR) 0;
1013 restore_current_thread (ptid_t ptid)
1015 switch_to_thread (ptid);
1019 restore_selected_frame (struct frame_id a_frame_id, int frame_level)
1021 struct frame_info *frame = NULL;
1024 /* This means there was no selected frame. */
1025 if (frame_level == -1)
1027 select_frame (NULL);
1031 gdb_assert (frame_level >= 0);
1033 /* Restore by level first, check if the frame id is the same as
1034 expected. If that fails, try restoring by frame id. If that
1035 fails, nothing to do, just warn the user. */
1037 count = frame_level;
1038 frame = find_relative_frame (get_current_frame (), &count);
1041 /* The frame ids must match - either both valid or both outer_frame_id.
1042 The latter case is not failsafe, but since it's highly unlikely
1043 the search by level finds the wrong frame, it's 99.9(9)% of
1044 the time (for all practical purposes) safe. */
1045 && frame_id_eq (get_frame_id (frame), a_frame_id))
1047 /* Cool, all is fine. */
1048 select_frame (frame);
1052 frame = frame_find_by_id (a_frame_id);
1055 /* Cool, refound it. */
1056 select_frame (frame);
1060 /* Nothing else to do, the frame layout really changed. Select the
1061 innermost stack frame. */
1062 select_frame (get_current_frame ());
1064 /* Warn the user. */
1065 if (frame_level > 0 && !ui_out_is_mi_like_p (current_uiout))
1067 warning (_("Couldn't restore frame #%d in "
1068 "current thread. Bottom (innermost) frame selected:"),
1070 /* For MI, we should probably have a notification about
1071 current frame change. But this error is not very
1072 likely, so don't bother for now. */
1073 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
1077 struct current_thread_cleanup
1079 ptid_t inferior_ptid;
1080 struct frame_id selected_frame_id;
1081 int selected_frame_level;
1088 do_restore_current_thread_cleanup (void *arg)
1090 struct thread_info *tp;
1091 struct current_thread_cleanup *old = arg;
1093 tp = find_thread_ptid (old->inferior_ptid);
1095 /* If the previously selected thread belonged to a process that has
1096 in the mean time been deleted (due to normal exit, detach, etc.),
1097 then don't revert back to it, but instead simply drop back to no
1100 && find_inferior_pid (ptid_get_pid (tp->ptid)) != NULL)
1101 restore_current_thread (old->inferior_ptid);
1104 restore_current_thread (null_ptid);
1105 set_current_inferior (find_inferior_id (old->inf_id));
1108 /* The running state of the originally selected thread may have
1109 changed, so we have to recheck it here. */
1110 if (!ptid_equal (inferior_ptid, null_ptid)
1112 && is_stopped (inferior_ptid)
1113 && target_has_registers
1115 && target_has_memory)
1116 restore_selected_frame (old->selected_frame_id,
1117 old->selected_frame_level);
1121 restore_current_thread_cleanup_dtor (void *arg)
1123 struct current_thread_cleanup *old = arg;
1124 struct thread_info *tp;
1125 struct inferior *inf;
1127 tp = find_thread_ptid (old->inferior_ptid);
1130 inf = find_inferior_id (old->inf_id);
1132 inf->removable = old->was_removable;
1136 /* Set the thread reference count. */
1139 set_thread_refcount (void *data)
1142 struct thread_array_cleanup *ta_cleanup = data;
1144 for (k = 0; k != ta_cleanup->count; k++)
1145 ta_cleanup->tp_array[k]->refcount--;
1149 make_cleanup_restore_current_thread (void)
1151 struct thread_info *tp;
1152 struct frame_info *frame;
1153 struct current_thread_cleanup *old;
1155 old = xmalloc (sizeof (struct current_thread_cleanup));
1156 old->inferior_ptid = inferior_ptid;
1157 old->inf_id = current_inferior ()->num;
1158 old->was_removable = current_inferior ()->removable;
1160 if (!ptid_equal (inferior_ptid, null_ptid))
1162 old->was_stopped = is_stopped (inferior_ptid);
1163 if (old->was_stopped
1164 && target_has_registers
1166 && target_has_memory)
1168 /* When processing internal events, there might not be a
1169 selected frame. If we naively call get_selected_frame
1170 here, then we can end up reading debuginfo for the
1171 current frame, but we don't generally need the debuginfo
1173 frame = get_selected_frame_if_set ();
1178 old->selected_frame_id = get_frame_id (frame);
1179 old->selected_frame_level = frame_relative_level (frame);
1181 tp = find_thread_ptid (inferior_ptid);
1186 current_inferior ()->removable = 0;
1188 return make_cleanup_dtor (do_restore_current_thread_cleanup, old,
1189 restore_current_thread_cleanup_dtor);
1192 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1193 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1194 of two numbers seperated by a hyphen. Examples:
1196 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1197 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1198 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1201 thread_apply_all_command (char *cmd, int from_tty)
1203 struct cleanup *old_chain;
1206 struct thread_array_cleanup ta_cleanup;
1208 if (cmd == NULL || *cmd == '\000')
1209 error (_("Please specify a command following the thread ID list"));
1211 update_thread_list ();
1213 old_chain = make_cleanup_restore_current_thread ();
1215 /* Save a copy of the command in case it is clobbered by
1217 saved_cmd = xstrdup (cmd);
1218 make_cleanup (xfree, saved_cmd);
1219 tc = thread_count ();
1223 struct thread_info **tp_array;
1224 struct thread_info *tp;
1227 /* Save a copy of the thread_list in case we execute detach
1229 tp_array = xmalloc (sizeof (struct thread_info *) * tc);
1230 make_cleanup (xfree, tp_array);
1231 ta_cleanup.tp_array = tp_array;
1232 ta_cleanup.count = tc;
1234 ALL_NON_EXITED_THREADS (tp)
1241 make_cleanup (set_thread_refcount, &ta_cleanup);
1243 for (k = 0; k != i; k++)
1244 if (thread_alive (tp_array[k]))
1246 switch_to_thread (tp_array[k]->ptid);
1247 printf_filtered (_("\nThread %d (%s):\n"),
1249 target_pid_to_str (inferior_ptid));
1250 execute_command (cmd, from_tty);
1252 /* Restore exact command used previously. */
1253 strcpy (cmd, saved_cmd);
1257 do_cleanups (old_chain);
1261 thread_apply_command (char *tidlist, int from_tty)
1264 struct cleanup *old_chain;
1266 struct get_number_or_range_state state;
1268 if (tidlist == NULL || *tidlist == '\000')
1269 error (_("Please specify a thread ID list"));
1271 for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
1274 error (_("Please specify a command following the thread ID list"));
1276 /* Save a copy of the command in case it is clobbered by
1278 saved_cmd = xstrdup (cmd);
1279 old_chain = make_cleanup (xfree, saved_cmd);
1281 init_number_or_range (&state, tidlist);
1282 while (!state.finished && state.string < cmd)
1284 struct thread_info *tp;
1287 start = get_number_or_range (&state);
1289 make_cleanup_restore_current_thread ();
1291 tp = find_thread_id (start);
1294 warning (_("Unknown thread %d."), start);
1295 else if (!thread_alive (tp))
1296 warning (_("Thread %d has terminated."), start);
1299 switch_to_thread (tp->ptid);
1301 printf_filtered (_("\nThread %d (%s):\n"), tp->num,
1302 target_pid_to_str (inferior_ptid));
1303 execute_command (cmd, from_tty);
1305 /* Restore exact command used previously. */
1306 strcpy (cmd, saved_cmd);
1310 do_cleanups (old_chain);
1313 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1314 if prefix of arg is `apply'. */
1317 thread_command (char *tidstr, int from_tty)
1321 if (ptid_equal (inferior_ptid, null_ptid))
1322 error (_("No thread selected"));
1324 if (target_has_stack)
1326 if (is_exited (inferior_ptid))
1327 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1328 pid_to_thread_id (inferior_ptid),
1329 target_pid_to_str (inferior_ptid));
1331 printf_filtered (_("[Current thread is %d (%s)]\n"),
1332 pid_to_thread_id (inferior_ptid),
1333 target_pid_to_str (inferior_ptid));
1336 error (_("No stack."));
1340 gdb_thread_select (current_uiout, tidstr, NULL);
1343 /* Implementation of `thread name'. */
1346 thread_name_command (char *arg, int from_tty)
1348 struct thread_info *info;
1350 if (ptid_equal (inferior_ptid, null_ptid))
1351 error (_("No thread selected"));
1353 arg = skip_spaces (arg);
1355 info = inferior_thread ();
1357 info->name = arg ? xstrdup (arg) : NULL;
1360 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1363 thread_find_command (char *arg, int from_tty)
1365 struct thread_info *tp;
1367 unsigned long match = 0;
1369 if (arg == NULL || *arg == '\0')
1370 error (_("Command requires an argument."));
1372 tmp = re_comp (arg);
1374 error (_("Invalid regexp (%s): %s"), tmp, arg);
1376 update_thread_list ();
1377 for (tp = thread_list; tp; tp = tp->next)
1379 if (tp->name != NULL && re_exec (tp->name))
1381 printf_filtered (_("Thread %d has name '%s'\n"),
1386 tmp = target_thread_name (tp);
1387 if (tmp != NULL && re_exec (tmp))
1389 printf_filtered (_("Thread %d has target name '%s'\n"),
1394 tmp = target_pid_to_str (tp->ptid);
1395 if (tmp != NULL && re_exec (tmp))
1397 printf_filtered (_("Thread %d has target id '%s'\n"),
1402 tmp = target_extra_thread_info (tp);
1403 if (tmp != NULL && re_exec (tmp))
1405 printf_filtered (_("Thread %d has extra info '%s'\n"),
1411 printf_filtered (_("No threads match '%s'\n"), arg);
1414 /* Print notices when new threads are attached and detached. */
1415 int print_thread_events = 1;
1417 show_print_thread_events (struct ui_file *file, int from_tty,
1418 struct cmd_list_element *c, const char *value)
1420 fprintf_filtered (file,
1421 _("Printing of thread events is %s.\n"),
1426 do_captured_thread_select (struct ui_out *uiout, void *tidstr)
1429 struct thread_info *tp;
1431 num = value_as_long (parse_and_eval (tidstr));
1433 tp = find_thread_id (num);
1436 error (_("Thread ID %d not known."), num);
1438 if (!thread_alive (tp))
1439 error (_("Thread ID %d has terminated."), num);
1441 switch_to_thread (tp->ptid);
1443 annotate_thread_changed ();
1445 ui_out_text (uiout, "[Switching to thread ");
1446 ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
1447 ui_out_text (uiout, " (");
1448 ui_out_text (uiout, target_pid_to_str (inferior_ptid));
1449 ui_out_text (uiout, ")]");
1451 /* Note that we can't reach this with an exited thread, due to the
1452 thread_alive check above. */
1453 if (tp->state == THREAD_RUNNING)
1454 ui_out_text (uiout, "(running)\n");
1457 ui_out_text (uiout, "\n");
1458 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
1461 /* Since the current thread may have changed, see if there is any
1462 exited thread we can now delete. */
1469 gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
1471 if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
1472 error_message, RETURN_MASK_ALL) < 0)
1478 update_thread_list (void)
1481 target_find_new_threads ();
1484 /* Return a new value for the selected thread's id. Return a value of 0 if
1485 no thread is selected, or no threads exist. */
1487 static struct value *
1488 thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
1491 struct thread_info *tp = find_thread_ptid (inferior_ptid);
1493 return value_from_longest (builtin_type (gdbarch)->builtin_int,
1494 (tp ? tp->num : 0));
1497 /* Commands with a prefix of `thread'. */
1498 struct cmd_list_element *thread_cmd_list = NULL;
1500 /* Implementation of `thread' variable. */
1502 static const struct internalvar_funcs thread_funcs =
1504 thread_id_make_value,
1510 _initialize_thread (void)
1512 static struct cmd_list_element *thread_apply_list = NULL;
1514 add_info ("threads", info_threads_command,
1515 _("Display currently known threads.\n\
1516 Usage: info threads [ID]...\n\
1517 Optional arguments are thread IDs with spaces between.\n\
1518 If no arguments, all threads are displayed."));
1520 add_prefix_cmd ("thread", class_run, thread_command, _("\
1521 Use this command to switch between threads.\n\
1522 The new thread ID must be currently known."),
1523 &thread_cmd_list, "thread ", 1, &cmdlist);
1525 add_prefix_cmd ("apply", class_run, thread_apply_command,
1526 _("Apply a command to a list of threads."),
1527 &thread_apply_list, "thread apply ", 1, &thread_cmd_list);
1529 add_cmd ("all", class_run, thread_apply_all_command,
1530 _("Apply a command to all threads."), &thread_apply_list);
1532 add_cmd ("name", class_run, thread_name_command,
1533 _("Set the current thread's name.\n\
1534 Usage: thread name [NAME]\n\
1535 If NAME is not given, then any existing name is removed."), &thread_cmd_list);
1537 add_cmd ("find", class_run, thread_find_command, _("\
1538 Find threads that match a regular expression.\n\
1539 Usage: thread find REGEXP\n\
1540 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1544 add_com_alias ("t", "thread", class_run, 1);
1546 add_setshow_boolean_cmd ("thread-events", no_class,
1547 &print_thread_events, _("\
1548 Set printing of thread events (such as thread start and exit)."), _("\
1549 Show printing of thread events (such as thread start and exit)."), NULL,
1551 show_print_thread_events,
1552 &setprintlist, &showprintlist);
1554 create_internalvar_type_lazy ("_thread", &thread_funcs, NULL);