1 /* Multi-process/thread control for GDB, the GNU debugger.
3 Copyright (C) 1986-2013 Free Software Foundation, Inc.
5 Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
29 #include "gdbthread.h"
30 #include "exceptions.h"
35 #include "gdb_string.h"
39 #include <sys/types.h>
44 #include "cli/cli-decode.h"
45 #include "gdb_regex.h"
46 #include "cli/cli-utils.h"
47 #include "continuations.h"
49 /* Definition of struct thread_info exported to gdbthread.h. */
51 /* Prototypes for exported functions. */
53 void _initialize_thread (void);
55 /* Prototypes for local functions. */
57 struct thread_info *thread_list = NULL;
58 static int highest_thread_num;
60 static void thread_command (char *tidstr, int from_tty);
61 static void thread_apply_all_command (char *, int);
62 static int thread_alive (struct thread_info *);
63 static void info_threads_command (char *, int);
64 static void thread_apply_command (char *, int);
65 static void restore_current_thread (ptid_t);
66 static void prune_threads (void);
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);
653 struct thread_info *tp;
655 for (tp = thread_list; tp; tp = tp->next)
656 if (tp->state == THREAD_RUNNING)
663 is_executing (ptid_t ptid)
665 struct thread_info *tp;
667 tp = find_thread_ptid (ptid);
669 return tp->executing;
673 set_executing (ptid_t ptid, int executing)
675 struct thread_info *tp;
676 int all = ptid_equal (ptid, minus_one_ptid);
678 if (all || ptid_is_pid (ptid))
680 for (tp = thread_list; tp; tp = tp->next)
681 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
682 tp->executing = executing;
686 tp = find_thread_ptid (ptid);
688 tp->executing = executing;
693 set_stop_requested (ptid_t ptid, int stop)
695 struct thread_info *tp;
696 int all = ptid_equal (ptid, minus_one_ptid);
698 if (all || ptid_is_pid (ptid))
700 for (tp = thread_list; tp; tp = tp->next)
701 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
702 tp->stop_requested = stop;
706 tp = find_thread_ptid (ptid);
708 tp->stop_requested = stop;
711 /* Call the stop requested observer so other components of GDB can
712 react to this request. */
714 observer_notify_thread_stop_requested (ptid);
718 finish_thread_state (ptid_t ptid)
720 struct thread_info *tp;
724 all = ptid_equal (ptid, minus_one_ptid);
726 if (all || ptid_is_pid (ptid))
728 for (tp = thread_list; tp; tp = tp->next)
730 if (tp->state == THREAD_EXITED)
732 if (all || ptid_get_pid (ptid) == ptid_get_pid (tp->ptid))
734 if (tp->executing && tp->state == THREAD_STOPPED)
736 tp->state = tp->executing ? THREAD_RUNNING : THREAD_STOPPED;
742 tp = find_thread_ptid (ptid);
744 if (tp->state != THREAD_EXITED)
746 if (tp->executing && tp->state == THREAD_STOPPED)
748 tp->state = tp->executing ? THREAD_RUNNING : THREAD_STOPPED;
753 observer_notify_target_resumed (ptid);
757 finish_thread_state_cleanup (void *arg)
759 ptid_t *ptid_p = arg;
763 finish_thread_state (*ptid_p);
767 pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread)
769 return (pc >= thread->control.step_range_start
770 && pc < thread->control.step_range_end);
773 /* Prints the list of threads and their details on UIOUT.
774 This is a version of 'info_threads_command' suitable for
776 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
777 that should be printed. Otherwise, all threads are
779 If PID is not -1, only print threads from the process PID.
780 Otherwise, threads from all attached PIDs are printed.
781 If both REQUESTED_THREAD and PID are not -1, then the thread
782 is printed if it belongs to the specified process. Otherwise,
783 an error is raised. */
785 print_thread_info (struct ui_out *uiout, char *requested_threads, int pid)
787 struct thread_info *tp;
789 struct cleanup *old_chain;
790 char *extra_info, *name, *target_id;
791 int current_thread = -1;
793 update_thread_list ();
794 current_ptid = inferior_ptid;
796 /* We'll be switching threads temporarily. */
797 old_chain = make_cleanup_restore_current_thread ();
799 /* For backward compatibility, we make a list for MI. A table is
800 preferable for the CLI, though, because it shows table
802 if (ui_out_is_mi_like_p (uiout))
803 make_cleanup_ui_out_list_begin_end (uiout, "threads");
808 for (tp = thread_list; tp; tp = tp->next)
810 if (!number_is_in_list (requested_threads, tp->num))
813 if (pid != -1 && PIDGET (tp->ptid) != pid)
816 if (tp->state == THREAD_EXITED)
824 if (requested_threads == NULL || *requested_threads == '\0')
825 ui_out_message (uiout, 0, _("No threads.\n"));
827 ui_out_message (uiout, 0, _("No threads match '%s'.\n"),
829 do_cleanups (old_chain);
833 make_cleanup_ui_out_table_begin_end (uiout, 4, n_threads, "threads");
835 ui_out_table_header (uiout, 1, ui_left, "current", "");
836 ui_out_table_header (uiout, 4, ui_left, "id", "Id");
837 ui_out_table_header (uiout, 17, ui_left, "target-id", "Target Id");
838 ui_out_table_header (uiout, 1, ui_left, "frame", "Frame");
839 ui_out_table_body (uiout);
842 for (tp = thread_list; tp; tp = tp->next)
844 struct cleanup *chain2;
847 if (!number_is_in_list (requested_threads, tp->num))
850 if (pid != -1 && PIDGET (tp->ptid) != pid)
852 if (requested_threads != NULL && *requested_threads != '\0')
853 error (_("Requested thread not found in requested process"));
857 if (ptid_equal (tp->ptid, current_ptid))
858 current_thread = tp->num;
860 if (tp->state == THREAD_EXITED)
863 chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
865 if (ui_out_is_mi_like_p (uiout))
868 if (ptid_equal (tp->ptid, current_ptid))
869 ui_out_text (uiout, "* ");
871 ui_out_text (uiout, " ");
875 if (ptid_equal (tp->ptid, current_ptid))
876 ui_out_field_string (uiout, "current", "*");
878 ui_out_field_skip (uiout, "current");
881 ui_out_field_int (uiout, "id", tp->num);
883 /* For the CLI, we stuff everything into the target-id field.
884 This is a gross hack to make the output come out looking
885 correct. The underlying problem here is that ui-out has no
886 way to specify that a field's space allocation should be
887 shared by several fields. For MI, we do the right thing
890 target_id = target_pid_to_str (tp->ptid);
891 extra_info = target_extra_thread_info (tp);
892 name = tp->name ? tp->name : target_thread_name (tp);
894 if (ui_out_is_mi_like_p (uiout))
896 ui_out_field_string (uiout, "target-id", target_id);
898 ui_out_field_string (uiout, "details", extra_info);
900 ui_out_field_string (uiout, "name", name);
904 struct cleanup *str_cleanup;
907 if (extra_info && name)
908 contents = xstrprintf ("%s \"%s\" (%s)", target_id,
911 contents = xstrprintf ("%s (%s)", target_id, extra_info);
913 contents = xstrprintf ("%s \"%s\"", target_id, name);
915 contents = xstrdup (target_id);
916 str_cleanup = make_cleanup (xfree, contents);
918 ui_out_field_string (uiout, "target-id", contents);
919 do_cleanups (str_cleanup);
922 if (tp->state == THREAD_RUNNING)
923 ui_out_text (uiout, "(running)\n");
926 /* The switch below puts us at the top of the stack (leaf
928 switch_to_thread (tp->ptid);
929 print_stack_frame (get_selected_frame (NULL),
930 /* For MI output, print frame level. */
931 ui_out_is_mi_like_p (uiout),
935 if (ui_out_is_mi_like_p (uiout))
937 char *state = "stopped";
939 if (tp->state == THREAD_RUNNING)
941 ui_out_field_string (uiout, "state", state);
944 core = target_core_of_thread (tp->ptid);
945 if (ui_out_is_mi_like_p (uiout) && core != -1)
946 ui_out_field_int (uiout, "core", core);
948 do_cleanups (chain2);
951 /* Restores the current thread and the frame selected before
952 the "info threads" command. */
953 do_cleanups (old_chain);
955 if (pid == -1 && requested_threads == NULL)
957 gdb_assert (current_thread != -1
959 || ptid_equal (inferior_ptid, null_ptid));
960 if (current_thread != -1 && ui_out_is_mi_like_p (uiout))
961 ui_out_field_int (uiout, "current-thread-id", current_thread);
963 if (current_thread != -1 && is_exited (current_ptid))
964 ui_out_message (uiout, 0, "\n\
965 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
968 && current_thread == -1
969 && ptid_equal (current_ptid, null_ptid))
970 ui_out_message (uiout, 0, "\n\
971 No selected thread. See `help thread'.\n");
975 /* Print information about currently known threads
977 Optional ARG is a thread id, or list of thread ids.
979 Note: this has the drawback that it _really_ switches
980 threads, which frees the frame cache. A no-side
981 effects info-threads command would be nicer. */
984 info_threads_command (char *arg, int from_tty)
986 print_thread_info (current_uiout, arg, -1);
989 /* Switch from one thread to another. */
992 switch_to_thread (ptid_t ptid)
994 /* Switch the program space as well, if we can infer it from the now
995 current thread. Otherwise, it's up to the caller to select the
997 if (!ptid_equal (ptid, null_ptid))
999 struct inferior *inf;
1001 inf = find_inferior_pid (ptid_get_pid (ptid));
1002 gdb_assert (inf != NULL);
1003 set_current_program_space (inf->pspace);
1004 set_current_inferior (inf);
1007 if (ptid_equal (ptid, inferior_ptid))
1010 inferior_ptid = ptid;
1011 reinit_frame_cache ();
1013 /* We don't check for is_stopped, because we're called at times
1014 while in the TARGET_RUNNING state, e.g., while handling an
1016 if (!ptid_equal (inferior_ptid, null_ptid)
1017 && !is_exited (ptid)
1018 && !is_executing (ptid))
1019 stop_pc = regcache_read_pc (get_thread_regcache (ptid));
1021 stop_pc = ~(CORE_ADDR) 0;
1025 restore_current_thread (ptid_t ptid)
1027 switch_to_thread (ptid);
1031 restore_selected_frame (struct frame_id a_frame_id, int frame_level)
1033 struct frame_info *frame = NULL;
1036 /* This means there was no selected frame. */
1037 if (frame_level == -1)
1039 select_frame (NULL);
1043 gdb_assert (frame_level >= 0);
1045 /* Restore by level first, check if the frame id is the same as
1046 expected. If that fails, try restoring by frame id. If that
1047 fails, nothing to do, just warn the user. */
1049 count = frame_level;
1050 frame = find_relative_frame (get_current_frame (), &count);
1053 /* The frame ids must match - either both valid or both outer_frame_id.
1054 The latter case is not failsafe, but since it's highly unlikely
1055 the search by level finds the wrong frame, it's 99.9(9)% of
1056 the time (for all practical purposes) safe. */
1057 && frame_id_eq (get_frame_id (frame), a_frame_id))
1059 /* Cool, all is fine. */
1060 select_frame (frame);
1064 frame = frame_find_by_id (a_frame_id);
1067 /* Cool, refound it. */
1068 select_frame (frame);
1072 /* Nothing else to do, the frame layout really changed. Select the
1073 innermost stack frame. */
1074 select_frame (get_current_frame ());
1076 /* Warn the user. */
1077 if (frame_level > 0 && !ui_out_is_mi_like_p (current_uiout))
1079 warning (_("Couldn't restore frame #%d in "
1080 "current thread. Bottom (innermost) frame selected:"),
1082 /* For MI, we should probably have a notification about
1083 current frame change. But this error is not very
1084 likely, so don't bother for now. */
1085 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
1089 struct current_thread_cleanup
1091 ptid_t inferior_ptid;
1092 struct frame_id selected_frame_id;
1093 int selected_frame_level;
1100 do_restore_current_thread_cleanup (void *arg)
1102 struct thread_info *tp;
1103 struct current_thread_cleanup *old = arg;
1105 tp = find_thread_ptid (old->inferior_ptid);
1107 /* If the previously selected thread belonged to a process that has
1108 in the mean time been deleted (due to normal exit, detach, etc.),
1109 then don't revert back to it, but instead simply drop back to no
1112 && find_inferior_pid (ptid_get_pid (tp->ptid)) != NULL)
1113 restore_current_thread (old->inferior_ptid);
1116 restore_current_thread (null_ptid);
1117 set_current_inferior (find_inferior_id (old->inf_id));
1120 /* The running state of the originally selected thread may have
1121 changed, so we have to recheck it here. */
1122 if (!ptid_equal (inferior_ptid, null_ptid)
1124 && is_stopped (inferior_ptid)
1125 && target_has_registers
1127 && target_has_memory)
1128 restore_selected_frame (old->selected_frame_id,
1129 old->selected_frame_level);
1133 restore_current_thread_cleanup_dtor (void *arg)
1135 struct current_thread_cleanup *old = arg;
1136 struct thread_info *tp;
1137 struct inferior *inf;
1139 tp = find_thread_ptid (old->inferior_ptid);
1142 inf = find_inferior_id (old->inf_id);
1144 inf->removable = old->was_removable;
1148 /* Set the thread reference count. */
1151 set_thread_refcount (void *data)
1154 struct thread_array_cleanup *ta_cleanup = data;
1156 for (k = 0; k != ta_cleanup->count; k++)
1157 ta_cleanup->tp_array[k]->refcount--;
1161 make_cleanup_restore_current_thread (void)
1163 struct thread_info *tp;
1164 struct frame_info *frame;
1165 struct current_thread_cleanup *old;
1167 old = xmalloc (sizeof (struct current_thread_cleanup));
1168 old->inferior_ptid = inferior_ptid;
1169 old->inf_id = current_inferior ()->num;
1170 old->was_removable = current_inferior ()->removable;
1172 if (!ptid_equal (inferior_ptid, null_ptid))
1174 old->was_stopped = is_stopped (inferior_ptid);
1175 if (old->was_stopped
1176 && target_has_registers
1178 && target_has_memory)
1180 /* When processing internal events, there might not be a
1181 selected frame. If we naively call get_selected_frame
1182 here, then we can end up reading debuginfo for the
1183 current frame, but we don't generally need the debuginfo
1185 frame = get_selected_frame_if_set ();
1190 old->selected_frame_id = get_frame_id (frame);
1191 old->selected_frame_level = frame_relative_level (frame);
1193 tp = find_thread_ptid (inferior_ptid);
1198 current_inferior ()->removable = 0;
1200 return make_cleanup_dtor (do_restore_current_thread_cleanup, old,
1201 restore_current_thread_cleanup_dtor);
1204 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1205 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1206 of two numbers seperated by a hyphen. Examples:
1208 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1209 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1210 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1213 thread_apply_all_command (char *cmd, int from_tty)
1215 struct cleanup *old_chain;
1218 struct thread_array_cleanup ta_cleanup;
1220 if (cmd == NULL || *cmd == '\000')
1221 error (_("Please specify a command following the thread ID list"));
1223 update_thread_list ();
1225 old_chain = make_cleanup_restore_current_thread ();
1227 /* Save a copy of the command in case it is clobbered by
1229 saved_cmd = xstrdup (cmd);
1230 make_cleanup (xfree, saved_cmd);
1231 tc = thread_count ();
1235 struct thread_info **tp_array;
1236 struct thread_info *tp;
1239 /* Save a copy of the thread_list in case we execute detach
1241 tp_array = xmalloc (sizeof (struct thread_info *) * tc);
1242 make_cleanup (xfree, tp_array);
1243 ta_cleanup.tp_array = tp_array;
1244 ta_cleanup.count = tc;
1253 make_cleanup (set_thread_refcount, &ta_cleanup);
1255 for (k = 0; k != i; k++)
1256 if (thread_alive (tp_array[k]))
1258 switch_to_thread (tp_array[k]->ptid);
1259 printf_filtered (_("\nThread %d (%s):\n"),
1261 target_pid_to_str (inferior_ptid));
1262 execute_command (cmd, from_tty);
1264 /* Restore exact command used previously. */
1265 strcpy (cmd, saved_cmd);
1269 do_cleanups (old_chain);
1273 thread_apply_command (char *tidlist, int from_tty)
1276 struct cleanup *old_chain;
1278 struct get_number_or_range_state state;
1280 if (tidlist == NULL || *tidlist == '\000')
1281 error (_("Please specify a thread ID list"));
1283 for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
1286 error (_("Please specify a command following the thread ID list"));
1288 /* Save a copy of the command in case it is clobbered by
1290 saved_cmd = xstrdup (cmd);
1291 old_chain = make_cleanup (xfree, saved_cmd);
1293 init_number_or_range (&state, tidlist);
1294 while (!state.finished && state.string < cmd)
1296 struct thread_info *tp;
1299 start = get_number_or_range (&state);
1301 make_cleanup_restore_current_thread ();
1303 tp = find_thread_id (start);
1306 warning (_("Unknown thread %d."), start);
1307 else if (!thread_alive (tp))
1308 warning (_("Thread %d has terminated."), start);
1311 switch_to_thread (tp->ptid);
1313 printf_filtered (_("\nThread %d (%s):\n"), tp->num,
1314 target_pid_to_str (inferior_ptid));
1315 execute_command (cmd, from_tty);
1317 /* Restore exact command used previously. */
1318 strcpy (cmd, saved_cmd);
1322 do_cleanups (old_chain);
1325 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1326 if prefix of arg is `apply'. */
1329 thread_command (char *tidstr, int from_tty)
1333 if (ptid_equal (inferior_ptid, null_ptid))
1334 error (_("No thread selected"));
1336 if (target_has_stack)
1338 if (is_exited (inferior_ptid))
1339 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1340 pid_to_thread_id (inferior_ptid),
1341 target_pid_to_str (inferior_ptid));
1343 printf_filtered (_("[Current thread is %d (%s)]\n"),
1344 pid_to_thread_id (inferior_ptid),
1345 target_pid_to_str (inferior_ptid));
1348 error (_("No stack."));
1352 gdb_thread_select (current_uiout, tidstr, NULL);
1355 /* Implementation of `thread name'. */
1358 thread_name_command (char *arg, int from_tty)
1360 struct thread_info *info;
1362 if (ptid_equal (inferior_ptid, null_ptid))
1363 error (_("No thread selected"));
1365 arg = skip_spaces (arg);
1367 info = inferior_thread ();
1369 info->name = arg ? xstrdup (arg) : NULL;
1372 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1375 thread_find_command (char *arg, int from_tty)
1377 struct thread_info *tp;
1379 unsigned long match = 0;
1381 if (arg == NULL || *arg == '\0')
1382 error (_("Command requires an argument."));
1384 tmp = re_comp (arg);
1386 error (_("Invalid regexp (%s): %s"), tmp, arg);
1388 update_thread_list ();
1389 for (tp = thread_list; tp; tp = tp->next)
1391 if (tp->name != NULL && re_exec (tp->name))
1393 printf_filtered (_("Thread %d has name '%s'\n"),
1398 tmp = target_thread_name (tp);
1399 if (tmp != NULL && re_exec (tmp))
1401 printf_filtered (_("Thread %d has target name '%s'\n"),
1406 tmp = target_pid_to_str (tp->ptid);
1407 if (tmp != NULL && re_exec (tmp))
1409 printf_filtered (_("Thread %d has target id '%s'\n"),
1414 tmp = target_extra_thread_info (tp);
1415 if (tmp != NULL && re_exec (tmp))
1417 printf_filtered (_("Thread %d has extra info '%s'\n"),
1423 printf_filtered (_("No threads match '%s'\n"), arg);
1426 /* Print notices when new threads are attached and detached. */
1427 int print_thread_events = 1;
1429 show_print_thread_events (struct ui_file *file, int from_tty,
1430 struct cmd_list_element *c, const char *value)
1432 fprintf_filtered (file,
1433 _("Printing of thread events is %s.\n"),
1438 do_captured_thread_select (struct ui_out *uiout, void *tidstr)
1441 struct thread_info *tp;
1443 num = value_as_long (parse_and_eval (tidstr));
1445 tp = find_thread_id (num);
1448 error (_("Thread ID %d not known."), num);
1450 if (!thread_alive (tp))
1451 error (_("Thread ID %d has terminated."), num);
1453 switch_to_thread (tp->ptid);
1455 annotate_thread_changed ();
1457 ui_out_text (uiout, "[Switching to thread ");
1458 ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
1459 ui_out_text (uiout, " (");
1460 ui_out_text (uiout, target_pid_to_str (inferior_ptid));
1461 ui_out_text (uiout, ")]");
1463 /* Note that we can't reach this with an exited thread, due to the
1464 thread_alive check above. */
1465 if (tp->state == THREAD_RUNNING)
1466 ui_out_text (uiout, "(running)\n");
1469 ui_out_text (uiout, "\n");
1470 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
1473 /* Since the current thread may have changed, see if there is any
1474 exited thread we can now delete. */
1481 gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
1483 if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
1484 error_message, RETURN_MASK_ALL) < 0)
1490 update_thread_list (void)
1493 target_find_new_threads ();
1496 /* Return a new value for the selected thread's id. Return a value of 0 if
1497 no thread is selected, or no threads exist. */
1499 static struct value *
1500 thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
1503 struct thread_info *tp = find_thread_ptid (inferior_ptid);
1505 return value_from_longest (builtin_type (gdbarch)->builtin_int,
1506 (tp ? tp->num : 0));
1509 /* Commands with a prefix of `thread'. */
1510 struct cmd_list_element *thread_cmd_list = NULL;
1512 /* Implementation of `thread' variable. */
1514 static const struct internalvar_funcs thread_funcs =
1516 thread_id_make_value,
1522 _initialize_thread (void)
1524 static struct cmd_list_element *thread_apply_list = NULL;
1526 add_info ("threads", info_threads_command,
1527 _("Display currently known threads.\n\
1528 Usage: info threads [ID]...\n\
1529 Optional arguments are thread IDs with spaces between.\n\
1530 If no arguments, all threads are displayed."));
1532 add_prefix_cmd ("thread", class_run, thread_command, _("\
1533 Use this command to switch between threads.\n\
1534 The new thread ID must be currently known."),
1535 &thread_cmd_list, "thread ", 1, &cmdlist);
1537 add_prefix_cmd ("apply", class_run, thread_apply_command,
1538 _("Apply a command to a list of threads."),
1539 &thread_apply_list, "thread apply ", 1, &thread_cmd_list);
1541 add_cmd ("all", class_run, thread_apply_all_command,
1542 _("Apply a command to all threads."), &thread_apply_list);
1544 add_cmd ("name", class_run, thread_name_command,
1545 _("Set the current thread's name.\n\
1546 Usage: thread name [NAME]\n\
1547 If NAME is not given, then any existing name is removed."), &thread_cmd_list);
1549 add_cmd ("find", class_run, thread_find_command, _("\
1550 Find threads that match a regular expression.\n\
1551 Usage: thread find REGEXP\n\
1552 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1556 add_com_alias ("t", "thread", class_run, 1);
1558 add_setshow_boolean_cmd ("thread-events", no_class,
1559 &print_thread_events, _("\
1560 Set printing of thread events (such as thread start and exit)."), _("\
1561 Show printing of thread events (such as thread start and exit)."), NULL,
1563 show_print_thread_events,
1564 &setprintlist, &showprintlist);
1566 create_internalvar_type_lazy ("_thread", &thread_funcs, NULL);