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"
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_command (char *tidstr, int from_tty);
66 static void thread_apply_all_command (char *, int);
67 static int thread_alive (struct thread_info *);
68 static void info_threads_command (char *, int);
69 static void thread_apply_command (char *, int);
70 static void restore_current_thread (ptid_t);
72 /* Data to cleanup thread array. */
74 struct thread_array_cleanup
76 /* Array of thread pointers used to set
78 struct thread_info **tp_array;
80 /* Thread count in the array. */
86 inferior_thread (void)
88 struct thread_info *tp = find_thread_ptid (inferior_ptid);
93 /* Delete the breakpoint pointed at by BP_P, if there's one. */
96 delete_thread_breakpoint (struct breakpoint **bp_p)
100 delete_breakpoint (*bp_p);
106 delete_step_resume_breakpoint (struct thread_info *tp)
109 delete_thread_breakpoint (&tp->control.step_resume_breakpoint);
113 delete_exception_resume_breakpoint (struct thread_info *tp)
116 delete_thread_breakpoint (&tp->control.exception_resume_breakpoint);
119 /* See gdbthread.h. */
122 delete_single_step_breakpoints (struct thread_info *tp)
125 delete_thread_breakpoint (&tp->control.single_step_breakpoints);
128 /* Delete the breakpoint pointed at by BP_P at the next stop, if
132 delete_at_next_stop (struct breakpoint **bp)
136 (*bp)->disposition = disp_del_at_next_stop;
141 /* See gdbthread.h. */
144 thread_has_single_step_breakpoints_set (struct thread_info *tp)
146 return tp->control.single_step_breakpoints != NULL;
149 /* See gdbthread.h. */
152 thread_has_single_step_breakpoint_here (struct thread_info *tp,
153 struct address_space *aspace,
156 struct breakpoint *ss_bps = tp->control.single_step_breakpoints;
158 return (ss_bps != NULL
159 && breakpoint_has_location_inserted_here (ss_bps, aspace, addr));
163 clear_thread_inferior_resources (struct thread_info *tp)
165 /* NOTE: this will take care of any left-over step_resume breakpoints,
166 but not any user-specified thread-specific breakpoints. We can not
167 delete the breakpoint straight-off, because the inferior might not
168 be stopped at the moment. */
169 delete_at_next_stop (&tp->control.step_resume_breakpoint);
170 delete_at_next_stop (&tp->control.exception_resume_breakpoint);
171 delete_at_next_stop (&tp->control.single_step_breakpoints);
173 delete_longjmp_breakpoint_at_next_stop (tp->num);
175 bpstat_clear (&tp->control.stop_bpstat);
177 btrace_teardown (tp);
179 do_all_intermediate_continuations_thread (tp, 1);
180 do_all_continuations_thread (tp, 1);
184 free_thread (struct thread_info *tp)
188 if (tp->private_dtor)
189 tp->private_dtor (tp->private);
199 init_thread_list (void)
201 struct thread_info *tp, *tpnext;
203 highest_thread_num = 0;
208 for (tp = thread_list; tp; tp = tpnext)
215 threads_executing = 0;
218 /* Allocate a new thread with target id PTID and add it to the thread
221 static struct thread_info *
222 new_thread (ptid_t ptid)
224 struct thread_info *tp;
226 tp = xcalloc (1, sizeof (*tp));
229 tp->num = ++highest_thread_num;
230 tp->next = thread_list;
233 /* Nothing to follow yet. */
234 tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
235 tp->state = THREAD_STOPPED;
241 add_thread_silent (ptid_t ptid)
243 struct thread_info *tp;
245 tp = find_thread_ptid (ptid);
247 /* Found an old thread with the same id. It has to be dead,
248 otherwise we wouldn't be adding a new thread with the same id.
249 The OS is reusing this id --- delete it, and recreate a new
252 /* In addition to deleting the thread, if this is the current
253 thread, then we need to take care that delete_thread doesn't
254 really delete the thread if it is inferior_ptid. Create a
255 new template thread in the list with an invalid ptid, switch
256 to it, delete the original thread, reset the new thread's
257 ptid, and switch to it. */
259 if (ptid_equal (inferior_ptid, ptid))
261 tp = new_thread (null_ptid);
263 /* Make switch_to_thread not read from the thread. */
264 tp->state = THREAD_EXITED;
265 switch_to_thread (null_ptid);
267 /* Now we can delete it. */
268 delete_thread (ptid);
270 /* Now reset its ptid, and reswitch inferior_ptid to it. */
272 tp->state = THREAD_STOPPED;
273 switch_to_thread (ptid);
275 observer_notify_new_thread (tp);
281 /* Just go ahead and delete it. */
282 delete_thread (ptid);
285 tp = new_thread (ptid);
286 observer_notify_new_thread (tp);
292 add_thread_with_info (ptid_t ptid, struct private_thread_info *private)
294 struct thread_info *result = add_thread_silent (ptid);
296 result->private = private;
298 if (print_thread_events)
299 printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
301 annotate_new_thread ();
306 add_thread (ptid_t ptid)
308 return add_thread_with_info (ptid, NULL);
311 /* Delete thread PTID. If SILENT, don't notify the observer of this
314 delete_thread_1 (ptid_t ptid, int silent)
316 struct thread_info *tp, *tpprev;
320 for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
321 if (ptid_equal (tp->ptid, ptid))
327 /* If this is the current thread, or there's code out there that
328 relies on it existing (refcount > 0) we can't delete yet. Mark
329 it as exited, and notify it. */
331 || ptid_equal (tp->ptid, inferior_ptid))
333 if (tp->state != THREAD_EXITED)
335 observer_notify_thread_exit (tp, silent);
337 /* Tag it as exited. */
338 tp->state = THREAD_EXITED;
340 /* Clear breakpoints, etc. associated with this thread. */
341 clear_thread_inferior_resources (tp);
344 /* Will be really deleted some other time. */
348 /* Notify thread exit, but only if we haven't already. */
349 if (tp->state != THREAD_EXITED)
350 observer_notify_thread_exit (tp, silent);
352 /* Tag it as exited. */
353 tp->state = THREAD_EXITED;
354 clear_thread_inferior_resources (tp);
357 tpprev->next = tp->next;
359 thread_list = tp->next;
364 /* Delete thread PTID and notify of thread exit. If this is
365 inferior_ptid, don't actually delete it, but tag it as exited and
366 do the notification. If PTID is the user selected thread, clear
369 delete_thread (ptid_t ptid)
371 delete_thread_1 (ptid, 0 /* not silent */);
375 delete_thread_silent (ptid_t ptid)
377 delete_thread_1 (ptid, 1 /* silent */);
381 find_thread_id (int num)
383 struct thread_info *tp;
385 for (tp = thread_list; tp; tp = tp->next)
392 /* Find a thread_info by matching PTID. */
394 find_thread_ptid (ptid_t ptid)
396 struct thread_info *tp;
398 for (tp = thread_list; tp; tp = tp->next)
399 if (ptid_equal (tp->ptid, ptid))
406 * Thread iterator function.
408 * Calls a callback function once for each thread, so long as
409 * the callback function returns false. If the callback function
410 * returns true, the iteration will end and the current thread
411 * will be returned. This can be useful for implementing a
412 * search for a thread with arbitrary attributes, or for applying
413 * some operation to every thread.
415 * FIXME: some of the existing functionality, such as
416 * "Thread apply all", might be rewritten using this functionality.
420 iterate_over_threads (int (*callback) (struct thread_info *, void *),
423 struct thread_info *tp, *next;
425 for (tp = thread_list; tp; tp = next)
428 if ((*callback) (tp, data))
439 struct thread_info *tp;
441 for (tp = thread_list; tp; tp = tp->next)
448 valid_thread_id (int num)
450 struct thread_info *tp;
452 for (tp = thread_list; tp; tp = tp->next)
460 pid_to_thread_id (ptid_t ptid)
462 struct thread_info *tp;
464 for (tp = thread_list; tp; tp = tp->next)
465 if (ptid_equal (tp->ptid, ptid))
472 thread_id_to_pid (int num)
474 struct thread_info *thread = find_thread_id (num);
479 return pid_to_ptid (-1);
483 in_thread_list (ptid_t ptid)
485 struct thread_info *tp;
487 for (tp = thread_list; tp; tp = tp->next)
488 if (ptid_equal (tp->ptid, ptid))
491 return 0; /* Never heard of 'im. */
494 /* Finds the first thread of the inferior given by PID. If PID is -1,
495 return the first thread in the list. */
498 first_thread_of_process (int pid)
500 struct thread_info *tp, *ret = NULL;
502 for (tp = thread_list; tp; tp = tp->next)
503 if (pid == -1 || ptid_get_pid (tp->ptid) == pid)
504 if (ret == NULL || tp->num < ret->num)
511 any_thread_of_process (int pid)
513 struct thread_info *tp;
515 gdb_assert (pid != 0);
517 /* Prefer the current thread. */
518 if (ptid_get_pid (inferior_ptid) == pid)
519 return inferior_thread ();
521 ALL_NON_EXITED_THREADS (tp)
522 if (ptid_get_pid (tp->ptid) == pid)
529 any_live_thread_of_process (int pid)
531 struct thread_info *curr_tp = NULL;
532 struct thread_info *tp;
533 struct thread_info *tp_executing = NULL;
535 gdb_assert (pid != 0);
537 /* Prefer the current thread if it's not executing. */
538 if (ptid_get_pid (inferior_ptid) == pid)
540 /* If the current thread is dead, forget it. If it's not
541 executing, use it. Otherwise, still choose it (below), but
542 only if no other non-executing thread is found. */
543 curr_tp = inferior_thread ();
544 if (curr_tp->state == THREAD_EXITED)
546 else if (!curr_tp->executing)
550 ALL_NON_EXITED_THREADS (tp)
551 if (ptid_get_pid (tp->ptid) == pid)
559 /* If both the current thread and all live threads are executing,
560 prefer the current thread. */
564 /* Otherwise, just return an executing thread, if any. */
568 /* Print a list of thread ids currently known, and the total number of
569 threads. To be used from within catch_errors. */
571 do_captured_list_thread_ids (struct ui_out *uiout, void *arg)
573 struct thread_info *tp;
575 struct cleanup *cleanup_chain;
576 int current_thread = -1;
578 update_thread_list ();
580 cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");
582 for (tp = thread_list; tp; tp = tp->next)
584 if (tp->state == THREAD_EXITED)
587 if (ptid_equal (tp->ptid, inferior_ptid))
588 current_thread = tp->num;
591 ui_out_field_int (uiout, "thread-id", tp->num);
594 do_cleanups (cleanup_chain);
596 if (current_thread != -1)
597 ui_out_field_int (uiout, "current-thread-id", current_thread);
598 ui_out_field_int (uiout, "number-of-threads", num);
602 /* Official gdblib interface function to get a list of thread ids and
605 gdb_list_thread_ids (struct ui_out *uiout, char **error_message)
607 if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
608 error_message, RETURN_MASK_ALL) < 0)
613 /* Return true if TP is an active thread. */
615 thread_alive (struct thread_info *tp)
617 if (tp->state == THREAD_EXITED)
619 if (!target_thread_alive (tp->ptid))
624 /* See gdbthreads.h. */
629 struct thread_info *tp, *next;
631 for (tp = thread_list; tp; tp = next)
634 if (!thread_alive (tp))
635 delete_thread (tp->ptid);
639 /* Disable storing stack temporaries for the thread whose id is
643 disable_thread_stack_temporaries (void *data)
646 struct thread_info *tp = find_thread_ptid (*pd);
650 tp->stack_temporaries_enabled = 0;
651 VEC_free (value_ptr, tp->stack_temporaries);
657 /* Enable storing stack temporaries for thread with id PTID and return a
658 cleanup which can disable and clear the stack temporaries. */
661 enable_thread_stack_temporaries (ptid_t ptid)
663 struct thread_info *tp = find_thread_ptid (ptid);
667 gdb_assert (tp != NULL);
669 tp->stack_temporaries_enabled = 1;
670 tp->stack_temporaries = NULL;
671 data = (ptid_t *) xmalloc (sizeof (ptid_t));
673 c = make_cleanup (disable_thread_stack_temporaries, data);
678 /* Return non-zero value if stack temporaies are enabled for the thread
682 thread_stack_temporaries_enabled_p (ptid_t ptid)
684 struct thread_info *tp = find_thread_ptid (ptid);
689 return tp->stack_temporaries_enabled;
692 /* Push V on to the stack temporaries of the thread with id PTID. */
695 push_thread_stack_temporary (ptid_t ptid, struct value *v)
697 struct thread_info *tp = find_thread_ptid (ptid);
699 gdb_assert (tp != NULL && tp->stack_temporaries_enabled);
700 VEC_safe_push (value_ptr, tp->stack_temporaries, v);
703 /* Return 1 if VAL is among the stack temporaries of the thread
704 with id PTID. Return 0 otherwise. */
707 value_in_thread_stack_temporaries (struct value *val, ptid_t ptid)
709 struct thread_info *tp = find_thread_ptid (ptid);
711 gdb_assert (tp != NULL && tp->stack_temporaries_enabled);
712 if (!VEC_empty (value_ptr, tp->stack_temporaries))
717 for (i = 0; VEC_iterate (value_ptr, tp->stack_temporaries, i, v); i++)
725 /* Return the last of the stack temporaries for thread with id PTID.
726 Return NULL if there are no stack temporaries for the thread. */
729 get_last_thread_stack_temporary (ptid_t ptid)
731 struct value *lastval = NULL;
732 struct thread_info *tp = find_thread_ptid (ptid);
734 gdb_assert (tp != NULL);
735 if (!VEC_empty (value_ptr, tp->stack_temporaries))
736 lastval = VEC_last (value_ptr, tp->stack_temporaries);
742 thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid)
744 struct inferior *inf;
745 struct thread_info *tp;
747 /* It can happen that what we knew as the target inferior id
748 changes. E.g, target remote may only discover the remote process
749 pid after adding the inferior to GDB's list. */
750 inf = find_inferior_pid (ptid_get_pid (old_ptid));
751 inf->pid = ptid_get_pid (new_ptid);
753 tp = find_thread_ptid (old_ptid);
756 observer_notify_thread_ptid_changed (old_ptid, new_ptid);
760 set_running (ptid_t ptid, int running)
762 struct thread_info *tp;
763 int all = ptid_equal (ptid, minus_one_ptid);
765 /* We try not to notify the observer if no thread has actually changed
766 the running state -- merely to reduce the number of messages to
767 frontend. Frontend is supposed to handle multiple *running just fine. */
768 if (all || ptid_is_pid (ptid))
772 for (tp = thread_list; tp; tp = tp->next)
773 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
775 if (tp->state == THREAD_EXITED)
777 if (running && tp->state == THREAD_STOPPED)
779 tp->state = running ? THREAD_RUNNING : THREAD_STOPPED;
782 observer_notify_target_resumed (ptid);
788 tp = find_thread_ptid (ptid);
790 gdb_assert (tp->state != THREAD_EXITED);
791 if (running && tp->state == THREAD_STOPPED)
793 tp->state = running ? THREAD_RUNNING : THREAD_STOPPED;
795 observer_notify_target_resumed (ptid);
800 is_thread_state (ptid_t ptid, enum thread_state state)
802 struct thread_info *tp;
804 tp = find_thread_ptid (ptid);
806 return tp->state == state;
810 is_stopped (ptid_t ptid)
812 return is_thread_state (ptid, THREAD_STOPPED);
816 is_exited (ptid_t ptid)
818 return is_thread_state (ptid, THREAD_EXITED);
822 is_running (ptid_t ptid)
824 return is_thread_state (ptid, THREAD_RUNNING);
828 is_executing (ptid_t ptid)
830 struct thread_info *tp;
832 tp = find_thread_ptid (ptid);
834 return tp->executing;
838 set_executing (ptid_t ptid, int executing)
840 struct thread_info *tp;
841 int all = ptid_equal (ptid, minus_one_ptid);
843 if (all || ptid_is_pid (ptid))
845 for (tp = thread_list; tp; tp = tp->next)
846 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
847 tp->executing = executing;
851 tp = find_thread_ptid (ptid);
853 tp->executing = executing;
856 /* It only takes one running thread to spawn more threads.*/
858 threads_executing = 1;
859 /* Only clear the flag if the caller is telling us everything is
861 else if (ptid_equal (minus_one_ptid, ptid))
862 threads_executing = 0;
865 /* See gdbthread.h. */
868 threads_are_executing (void)
870 return threads_executing;
874 set_stop_requested (ptid_t ptid, int stop)
876 struct thread_info *tp;
877 int all = ptid_equal (ptid, minus_one_ptid);
879 if (all || ptid_is_pid (ptid))
881 for (tp = thread_list; tp; tp = tp->next)
882 if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
883 tp->stop_requested = stop;
887 tp = find_thread_ptid (ptid);
889 tp->stop_requested = stop;
892 /* Call the stop requested observer so other components of GDB can
893 react to this request. */
895 observer_notify_thread_stop_requested (ptid);
899 finish_thread_state (ptid_t ptid)
901 struct thread_info *tp;
905 all = ptid_equal (ptid, minus_one_ptid);
907 if (all || ptid_is_pid (ptid))
909 for (tp = thread_list; tp; tp = tp->next)
911 if (tp->state == THREAD_EXITED)
913 if (all || ptid_get_pid (ptid) == ptid_get_pid (tp->ptid))
915 if (tp->executing && tp->state == THREAD_STOPPED)
917 tp->state = tp->executing ? THREAD_RUNNING : THREAD_STOPPED;
923 tp = find_thread_ptid (ptid);
925 if (tp->state != THREAD_EXITED)
927 if (tp->executing && tp->state == THREAD_STOPPED)
929 tp->state = tp->executing ? THREAD_RUNNING : THREAD_STOPPED;
934 observer_notify_target_resumed (ptid);
938 finish_thread_state_cleanup (void *arg)
940 ptid_t *ptid_p = arg;
944 finish_thread_state (*ptid_p);
948 pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread)
950 return (pc >= thread->control.step_range_start
951 && pc < thread->control.step_range_end);
954 /* Prints the list of threads and their details on UIOUT.
955 This is a version of 'info_threads_command' suitable for
957 If REQUESTED_THREAD is not -1, it's the GDB id of the thread
958 that should be printed. Otherwise, all threads are
960 If PID is not -1, only print threads from the process PID.
961 Otherwise, threads from all attached PIDs are printed.
962 If both REQUESTED_THREAD and PID are not -1, then the thread
963 is printed if it belongs to the specified process. Otherwise,
964 an error is raised. */
966 print_thread_info (struct ui_out *uiout, char *requested_threads, int pid)
968 struct thread_info *tp;
970 struct cleanup *old_chain;
971 char *extra_info, *name, *target_id;
972 int current_thread = -1;
974 update_thread_list ();
975 current_ptid = inferior_ptid;
977 /* We'll be switching threads temporarily. */
978 old_chain = make_cleanup_restore_current_thread ();
980 /* For backward compatibility, we make a list for MI. A table is
981 preferable for the CLI, though, because it shows table
983 if (ui_out_is_mi_like_p (uiout))
984 make_cleanup_ui_out_list_begin_end (uiout, "threads");
989 for (tp = thread_list; tp; tp = tp->next)
991 if (!number_is_in_list (requested_threads, tp->num))
994 if (pid != -1 && ptid_get_pid (tp->ptid) != pid)
997 if (tp->state == THREAD_EXITED)
1005 if (requested_threads == NULL || *requested_threads == '\0')
1006 ui_out_message (uiout, 0, _("No threads.\n"));
1008 ui_out_message (uiout, 0, _("No threads match '%s'.\n"),
1010 do_cleanups (old_chain);
1014 make_cleanup_ui_out_table_begin_end (uiout, 4, n_threads, "threads");
1016 ui_out_table_header (uiout, 1, ui_left, "current", "");
1017 ui_out_table_header (uiout, 4, ui_left, "id", "Id");
1018 ui_out_table_header (uiout, 17, ui_left, "target-id", "Target Id");
1019 ui_out_table_header (uiout, 1, ui_left, "frame", "Frame");
1020 ui_out_table_body (uiout);
1023 for (tp = thread_list; tp; tp = tp->next)
1025 struct cleanup *chain2;
1028 if (!number_is_in_list (requested_threads, tp->num))
1031 if (pid != -1 && ptid_get_pid (tp->ptid) != pid)
1033 if (requested_threads != NULL && *requested_threads != '\0')
1034 error (_("Requested thread not found in requested process"));
1038 if (ptid_equal (tp->ptid, current_ptid))
1039 current_thread = tp->num;
1041 if (tp->state == THREAD_EXITED)
1044 chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
1046 if (ui_out_is_mi_like_p (uiout))
1048 /* Compatibility. */
1049 if (ptid_equal (tp->ptid, current_ptid))
1050 ui_out_text (uiout, "* ");
1052 ui_out_text (uiout, " ");
1056 if (ptid_equal (tp->ptid, current_ptid))
1057 ui_out_field_string (uiout, "current", "*");
1059 ui_out_field_skip (uiout, "current");
1062 ui_out_field_int (uiout, "id", tp->num);
1064 /* For the CLI, we stuff everything into the target-id field.
1065 This is a gross hack to make the output come out looking
1066 correct. The underlying problem here is that ui-out has no
1067 way to specify that a field's space allocation should be
1068 shared by several fields. For MI, we do the right thing
1071 target_id = target_pid_to_str (tp->ptid);
1072 extra_info = target_extra_thread_info (tp);
1073 name = tp->name ? tp->name : target_thread_name (tp);
1075 if (ui_out_is_mi_like_p (uiout))
1077 ui_out_field_string (uiout, "target-id", target_id);
1079 ui_out_field_string (uiout, "details", extra_info);
1081 ui_out_field_string (uiout, "name", name);
1085 struct cleanup *str_cleanup;
1088 if (extra_info && name)
1089 contents = xstrprintf ("%s \"%s\" (%s)", target_id,
1091 else if (extra_info)
1092 contents = xstrprintf ("%s (%s)", target_id, extra_info);
1094 contents = xstrprintf ("%s \"%s\"", target_id, name);
1096 contents = xstrdup (target_id);
1097 str_cleanup = make_cleanup (xfree, contents);
1099 ui_out_field_string (uiout, "target-id", contents);
1100 do_cleanups (str_cleanup);
1103 if (tp->state == THREAD_RUNNING)
1104 ui_out_text (uiout, "(running)\n");
1107 /* The switch below puts us at the top of the stack (leaf
1109 switch_to_thread (tp->ptid);
1110 print_stack_frame (get_selected_frame (NULL),
1111 /* For MI output, print frame level. */
1112 ui_out_is_mi_like_p (uiout),
1116 if (ui_out_is_mi_like_p (uiout))
1118 char *state = "stopped";
1120 if (tp->state == THREAD_RUNNING)
1122 ui_out_field_string (uiout, "state", state);
1125 core = target_core_of_thread (tp->ptid);
1126 if (ui_out_is_mi_like_p (uiout) && core != -1)
1127 ui_out_field_int (uiout, "core", core);
1129 do_cleanups (chain2);
1132 /* Restores the current thread and the frame selected before
1133 the "info threads" command. */
1134 do_cleanups (old_chain);
1136 if (pid == -1 && requested_threads == NULL)
1138 gdb_assert (current_thread != -1
1140 || ptid_equal (inferior_ptid, null_ptid));
1141 if (current_thread != -1 && ui_out_is_mi_like_p (uiout))
1142 ui_out_field_int (uiout, "current-thread-id", current_thread);
1144 if (current_thread != -1 && is_exited (current_ptid))
1145 ui_out_message (uiout, 0, "\n\
1146 The current thread <Thread ID %d> has terminated. See `help thread'.\n",
1148 else if (thread_list
1149 && current_thread == -1
1150 && ptid_equal (current_ptid, null_ptid))
1151 ui_out_message (uiout, 0, "\n\
1152 No selected thread. See `help thread'.\n");
1156 /* Print information about currently known threads
1158 Optional ARG is a thread id, or list of thread ids.
1160 Note: this has the drawback that it _really_ switches
1161 threads, which frees the frame cache. A no-side
1162 effects info-threads command would be nicer. */
1165 info_threads_command (char *arg, int from_tty)
1167 print_thread_info (current_uiout, arg, -1);
1170 /* Switch from one thread to another. */
1173 switch_to_thread (ptid_t ptid)
1175 /* Switch the program space as well, if we can infer it from the now
1176 current thread. Otherwise, it's up to the caller to select the
1178 if (!ptid_equal (ptid, null_ptid))
1180 struct inferior *inf;
1182 inf = find_inferior_pid (ptid_get_pid (ptid));
1183 gdb_assert (inf != NULL);
1184 set_current_program_space (inf->pspace);
1185 set_current_inferior (inf);
1188 if (ptid_equal (ptid, inferior_ptid))
1191 inferior_ptid = ptid;
1192 reinit_frame_cache ();
1194 /* We don't check for is_stopped, because we're called at times
1195 while in the TARGET_RUNNING state, e.g., while handling an
1197 if (!ptid_equal (inferior_ptid, null_ptid)
1198 && !is_exited (ptid)
1199 && !is_executing (ptid))
1200 stop_pc = regcache_read_pc (get_thread_regcache (ptid));
1202 stop_pc = ~(CORE_ADDR) 0;
1206 restore_current_thread (ptid_t ptid)
1208 switch_to_thread (ptid);
1212 restore_selected_frame (struct frame_id a_frame_id, int frame_level)
1214 struct frame_info *frame = NULL;
1217 /* This means there was no selected frame. */
1218 if (frame_level == -1)
1220 select_frame (NULL);
1224 gdb_assert (frame_level >= 0);
1226 /* Restore by level first, check if the frame id is the same as
1227 expected. If that fails, try restoring by frame id. If that
1228 fails, nothing to do, just warn the user. */
1230 count = frame_level;
1231 frame = find_relative_frame (get_current_frame (), &count);
1234 /* The frame ids must match - either both valid or both outer_frame_id.
1235 The latter case is not failsafe, but since it's highly unlikely
1236 the search by level finds the wrong frame, it's 99.9(9)% of
1237 the time (for all practical purposes) safe. */
1238 && frame_id_eq (get_frame_id (frame), a_frame_id))
1240 /* Cool, all is fine. */
1241 select_frame (frame);
1245 frame = frame_find_by_id (a_frame_id);
1248 /* Cool, refound it. */
1249 select_frame (frame);
1253 /* Nothing else to do, the frame layout really changed. Select the
1254 innermost stack frame. */
1255 select_frame (get_current_frame ());
1257 /* Warn the user. */
1258 if (frame_level > 0 && !ui_out_is_mi_like_p (current_uiout))
1260 warning (_("Couldn't restore frame #%d in "
1261 "current thread. Bottom (innermost) frame selected:"),
1263 /* For MI, we should probably have a notification about
1264 current frame change. But this error is not very
1265 likely, so don't bother for now. */
1266 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
1270 struct current_thread_cleanup
1272 ptid_t inferior_ptid;
1273 struct frame_id selected_frame_id;
1274 int selected_frame_level;
1281 do_restore_current_thread_cleanup (void *arg)
1283 struct thread_info *tp;
1284 struct current_thread_cleanup *old = arg;
1286 tp = find_thread_ptid (old->inferior_ptid);
1288 /* If the previously selected thread belonged to a process that has
1289 in the mean time been deleted (due to normal exit, detach, etc.),
1290 then don't revert back to it, but instead simply drop back to no
1293 && find_inferior_pid (ptid_get_pid (tp->ptid)) != NULL)
1294 restore_current_thread (old->inferior_ptid);
1297 restore_current_thread (null_ptid);
1298 set_current_inferior (find_inferior_id (old->inf_id));
1301 /* The running state of the originally selected thread may have
1302 changed, so we have to recheck it here. */
1303 if (!ptid_equal (inferior_ptid, null_ptid)
1305 && is_stopped (inferior_ptid)
1306 && target_has_registers
1308 && target_has_memory)
1309 restore_selected_frame (old->selected_frame_id,
1310 old->selected_frame_level);
1314 restore_current_thread_cleanup_dtor (void *arg)
1316 struct current_thread_cleanup *old = arg;
1317 struct thread_info *tp;
1318 struct inferior *inf;
1320 tp = find_thread_ptid (old->inferior_ptid);
1323 inf = find_inferior_id (old->inf_id);
1325 inf->removable = old->was_removable;
1329 /* Set the thread reference count. */
1332 set_thread_refcount (void *data)
1335 struct thread_array_cleanup *ta_cleanup = data;
1337 for (k = 0; k != ta_cleanup->count; k++)
1338 ta_cleanup->tp_array[k]->refcount--;
1342 make_cleanup_restore_current_thread (void)
1344 struct thread_info *tp;
1345 struct frame_info *frame;
1346 struct current_thread_cleanup *old;
1348 old = xmalloc (sizeof (struct current_thread_cleanup));
1349 old->inferior_ptid = inferior_ptid;
1350 old->inf_id = current_inferior ()->num;
1351 old->was_removable = current_inferior ()->removable;
1353 if (!ptid_equal (inferior_ptid, null_ptid))
1355 old->was_stopped = is_stopped (inferior_ptid);
1356 if (old->was_stopped
1357 && target_has_registers
1359 && target_has_memory)
1361 /* When processing internal events, there might not be a
1362 selected frame. If we naively call get_selected_frame
1363 here, then we can end up reading debuginfo for the
1364 current frame, but we don't generally need the debuginfo
1366 frame = get_selected_frame_if_set ();
1371 old->selected_frame_id = get_frame_id (frame);
1372 old->selected_frame_level = frame_relative_level (frame);
1374 tp = find_thread_ptid (inferior_ptid);
1379 current_inferior ()->removable = 0;
1381 return make_cleanup_dtor (do_restore_current_thread_cleanup, old,
1382 restore_current_thread_cleanup_dtor);
1385 /* Apply a GDB command to a list of threads. List syntax is a whitespace
1386 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
1387 of two numbers seperated by a hyphen. Examples:
1389 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
1390 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
1391 thread apply all p x/i $pc Apply x/i $pc cmd to all threads. */
1394 thread_apply_all_command (char *cmd, int from_tty)
1396 struct cleanup *old_chain;
1399 struct thread_array_cleanup ta_cleanup;
1401 if (cmd == NULL || *cmd == '\000')
1402 error (_("Please specify a command following the thread ID list"));
1404 update_thread_list ();
1406 old_chain = make_cleanup_restore_current_thread ();
1408 /* Save a copy of the command in case it is clobbered by
1410 saved_cmd = xstrdup (cmd);
1411 make_cleanup (xfree, saved_cmd);
1412 tc = thread_count ();
1416 struct thread_info **tp_array;
1417 struct thread_info *tp;
1420 /* Save a copy of the thread_list in case we execute detach
1422 tp_array = xmalloc (sizeof (struct thread_info *) * tc);
1423 make_cleanup (xfree, tp_array);
1424 ta_cleanup.tp_array = tp_array;
1425 ta_cleanup.count = tc;
1427 ALL_NON_EXITED_THREADS (tp)
1434 make_cleanup (set_thread_refcount, &ta_cleanup);
1436 for (k = 0; k != i; k++)
1437 if (thread_alive (tp_array[k]))
1439 switch_to_thread (tp_array[k]->ptid);
1440 printf_filtered (_("\nThread %d (%s):\n"),
1442 target_pid_to_str (inferior_ptid));
1443 execute_command (cmd, from_tty);
1445 /* Restore exact command used previously. */
1446 strcpy (cmd, saved_cmd);
1450 do_cleanups (old_chain);
1454 thread_apply_command (char *tidlist, int from_tty)
1457 struct cleanup *old_chain;
1459 struct get_number_or_range_state state;
1461 if (tidlist == NULL || *tidlist == '\000')
1462 error (_("Please specify a thread ID list"));
1464 for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
1467 error (_("Please specify a command following the thread ID list"));
1469 /* Save a copy of the command in case it is clobbered by
1471 saved_cmd = xstrdup (cmd);
1472 old_chain = make_cleanup (xfree, saved_cmd);
1474 init_number_or_range (&state, tidlist);
1475 while (!state.finished && state.string < cmd)
1477 struct thread_info *tp;
1480 start = get_number_or_range (&state);
1482 make_cleanup_restore_current_thread ();
1484 tp = find_thread_id (start);
1487 warning (_("Unknown thread %d."), start);
1488 else if (!thread_alive (tp))
1489 warning (_("Thread %d has terminated."), start);
1492 switch_to_thread (tp->ptid);
1494 printf_filtered (_("\nThread %d (%s):\n"), tp->num,
1495 target_pid_to_str (inferior_ptid));
1496 execute_command (cmd, from_tty);
1498 /* Restore exact command used previously. */
1499 strcpy (cmd, saved_cmd);
1503 do_cleanups (old_chain);
1506 /* Switch to the specified thread. Will dispatch off to thread_apply_command
1507 if prefix of arg is `apply'. */
1510 thread_command (char *tidstr, int from_tty)
1514 if (ptid_equal (inferior_ptid, null_ptid))
1515 error (_("No thread selected"));
1517 if (target_has_stack)
1519 if (is_exited (inferior_ptid))
1520 printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
1521 pid_to_thread_id (inferior_ptid),
1522 target_pid_to_str (inferior_ptid));
1524 printf_filtered (_("[Current thread is %d (%s)]\n"),
1525 pid_to_thread_id (inferior_ptid),
1526 target_pid_to_str (inferior_ptid));
1529 error (_("No stack."));
1533 gdb_thread_select (current_uiout, tidstr, NULL);
1536 /* Implementation of `thread name'. */
1539 thread_name_command (char *arg, int from_tty)
1541 struct thread_info *info;
1543 if (ptid_equal (inferior_ptid, null_ptid))
1544 error (_("No thread selected"));
1546 arg = skip_spaces (arg);
1548 info = inferior_thread ();
1550 info->name = arg ? xstrdup (arg) : NULL;
1553 /* Find thread ids with a name, target pid, or extra info matching ARG. */
1556 thread_find_command (char *arg, int from_tty)
1558 struct thread_info *tp;
1560 unsigned long match = 0;
1562 if (arg == NULL || *arg == '\0')
1563 error (_("Command requires an argument."));
1565 tmp = re_comp (arg);
1567 error (_("Invalid regexp (%s): %s"), tmp, arg);
1569 update_thread_list ();
1570 for (tp = thread_list; tp; tp = tp->next)
1572 if (tp->name != NULL && re_exec (tp->name))
1574 printf_filtered (_("Thread %d has name '%s'\n"),
1579 tmp = target_thread_name (tp);
1580 if (tmp != NULL && re_exec (tmp))
1582 printf_filtered (_("Thread %d has target name '%s'\n"),
1587 tmp = target_pid_to_str (tp->ptid);
1588 if (tmp != NULL && re_exec (tmp))
1590 printf_filtered (_("Thread %d has target id '%s'\n"),
1595 tmp = target_extra_thread_info (tp);
1596 if (tmp != NULL && re_exec (tmp))
1598 printf_filtered (_("Thread %d has extra info '%s'\n"),
1604 printf_filtered (_("No threads match '%s'\n"), arg);
1607 /* Print notices when new threads are attached and detached. */
1608 int print_thread_events = 1;
1610 show_print_thread_events (struct ui_file *file, int from_tty,
1611 struct cmd_list_element *c, const char *value)
1613 fprintf_filtered (file,
1614 _("Printing of thread events is %s.\n"),
1619 do_captured_thread_select (struct ui_out *uiout, void *tidstr)
1622 struct thread_info *tp;
1624 num = value_as_long (parse_and_eval (tidstr));
1626 tp = find_thread_id (num);
1629 error (_("Thread ID %d not known."), num);
1631 if (!thread_alive (tp))
1632 error (_("Thread ID %d has terminated."), num);
1634 switch_to_thread (tp->ptid);
1636 annotate_thread_changed ();
1638 ui_out_text (uiout, "[Switching to thread ");
1639 ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
1640 ui_out_text (uiout, " (");
1641 ui_out_text (uiout, target_pid_to_str (inferior_ptid));
1642 ui_out_text (uiout, ")]");
1644 /* Note that we can't reach this with an exited thread, due to the
1645 thread_alive check above. */
1646 if (tp->state == THREAD_RUNNING)
1647 ui_out_text (uiout, "(running)\n");
1650 ui_out_text (uiout, "\n");
1651 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
1654 /* Since the current thread may have changed, see if there is any
1655 exited thread we can now delete. */
1662 gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
1664 if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
1665 error_message, RETURN_MASK_ALL) < 0)
1670 /* Update the 'threads_executing' global based on the threads we know
1674 update_threads_executing (void)
1676 struct thread_info *tp;
1678 threads_executing = 0;
1679 ALL_NON_EXITED_THREADS (tp)
1683 threads_executing = 1;
1690 update_thread_list (void)
1692 target_update_thread_list ();
1693 update_threads_executing ();
1696 /* Return a new value for the selected thread's id. Return a value of 0 if
1697 no thread is selected, or no threads exist. */
1699 static struct value *
1700 thread_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
1703 struct thread_info *tp = find_thread_ptid (inferior_ptid);
1705 return value_from_longest (builtin_type (gdbarch)->builtin_int,
1706 (tp ? tp->num : 0));
1709 /* Commands with a prefix of `thread'. */
1710 struct cmd_list_element *thread_cmd_list = NULL;
1712 /* Implementation of `thread' variable. */
1714 static const struct internalvar_funcs thread_funcs =
1716 thread_id_make_value,
1722 _initialize_thread (void)
1724 static struct cmd_list_element *thread_apply_list = NULL;
1726 add_info ("threads", info_threads_command,
1727 _("Display currently known threads.\n\
1728 Usage: info threads [ID]...\n\
1729 Optional arguments are thread IDs with spaces between.\n\
1730 If no arguments, all threads are displayed."));
1732 add_prefix_cmd ("thread", class_run, thread_command, _("\
1733 Use this command to switch between threads.\n\
1734 The new thread ID must be currently known."),
1735 &thread_cmd_list, "thread ", 1, &cmdlist);
1737 add_prefix_cmd ("apply", class_run, thread_apply_command,
1738 _("Apply a command to a list of threads."),
1739 &thread_apply_list, "thread apply ", 1, &thread_cmd_list);
1741 add_cmd ("all", class_run, thread_apply_all_command,
1742 _("Apply a command to all threads."), &thread_apply_list);
1744 add_cmd ("name", class_run, thread_name_command,
1745 _("Set the current thread's name.\n\
1746 Usage: thread name [NAME]\n\
1747 If NAME is not given, then any existing name is removed."), &thread_cmd_list);
1749 add_cmd ("find", class_run, thread_find_command, _("\
1750 Find threads that match a regular expression.\n\
1751 Usage: thread find REGEXP\n\
1752 Will display thread ids whose name, target ID, or extra info matches REGEXP."),
1756 add_com_alias ("t", "thread", class_run, 1);
1758 add_setshow_boolean_cmd ("thread-events", no_class,
1759 &print_thread_events, _("\
1760 Set printing of thread events (such as thread start and exit)."), _("\
1761 Show printing of thread events (such as thread start and exit)."), NULL,
1763 show_print_thread_events,
1764 &setprintlist, &showprintlist);
1766 create_internalvar_type_lazy ("_thread", &thread_funcs, NULL);