1 /* Multi-process/thread control for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 Free Software Foundation, Inc.
5 Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
32 #include "gdbthread.h"
38 #include <sys/types.h>
44 /*#include "lynxos-core.h" */
46 /* Definition of struct thread_info exported to gdbthread.h */
48 /* Prototypes for exported functions. */
50 void _initialize_thread (void);
52 /* Prototypes for local functions. */
54 static struct thread_info *thread_list = NULL;
55 static int highest_thread_num;
57 static struct thread_info *find_thread_id (int num);
59 static void thread_command (char *tidstr, int from_tty);
60 static void thread_apply_all_command (char *, int);
61 static int thread_alive (struct thread_info *);
62 static void info_threads_command (char *, int);
63 static void thread_apply_command (char *, int);
64 static void restore_current_thread (ptid_t);
65 static void switch_to_thread (ptid_t ptid);
66 static void prune_threads (void);
69 delete_step_resume_breakpoint (void *arg)
71 struct breakpoint **breakpointp = (struct breakpoint **) arg;
72 struct thread_info *tp;
74 if (*breakpointp != NULL)
76 delete_breakpoint (*breakpointp);
77 for (tp = thread_list; tp; tp = tp->next)
78 if (tp->step_resume_breakpoint == *breakpointp)
79 tp->step_resume_breakpoint = NULL;
86 free_thread (struct thread_info *tp)
88 /* NOTE: this will take care of any left-over step_resume breakpoints,
89 but not any user-specified thread-specific breakpoints. */
90 if (tp->step_resume_breakpoint)
91 delete_breakpoint (tp->step_resume_breakpoint);
93 /* FIXME: do I ever need to call the back-end to give it a
94 chance at this private data before deleting the thread? */
102 init_thread_list (void)
104 struct thread_info *tp, *tpnext;
106 highest_thread_num = 0;
110 for (tp = thread_list; tp; tp = tpnext)
119 /* add_thread now returns a pointer to the new thread_info,
120 so that back_ends can initialize their private data. */
123 add_thread (ptid_t ptid)
125 struct thread_info *tp;
127 tp = (struct thread_info *) xmalloc (sizeof (*tp));
128 memset (tp, 0, sizeof (*tp));
130 tp->num = ++highest_thread_num;
131 tp->next = thread_list;
137 delete_thread (ptid_t ptid)
139 struct thread_info *tp, *tpprev;
143 for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
144 if (ptid_equal (tp->ptid, ptid))
151 tpprev->next = tp->next;
153 thread_list = tp->next;
158 static struct thread_info *
159 find_thread_id (int num)
161 struct thread_info *tp;
163 for (tp = thread_list; tp; tp = tp->next)
170 /* Find a thread_info by matching PTID. */
172 find_thread_pid (ptid_t ptid)
174 struct thread_info *tp;
176 for (tp = thread_list; tp; tp = tp->next)
177 if (ptid_equal (tp->ptid, ptid))
184 * Thread iterator function.
186 * Calls a callback function once for each thread, so long as
187 * the callback function returns false. If the callback function
188 * returns true, the iteration will end and the current thread
189 * will be returned. This can be useful for implementing a
190 * search for a thread with arbitrary attributes, or for applying
191 * some operation to every thread.
193 * FIXME: some of the existing functionality, such as
194 * "Thread apply all", might be rewritten using this functionality.
198 iterate_over_threads (int (*callback) (struct thread_info *, void *),
201 struct thread_info *tp;
203 for (tp = thread_list; tp; tp = tp->next)
204 if ((*callback) (tp, data))
211 valid_thread_id (int num)
213 struct thread_info *tp;
215 for (tp = thread_list; tp; tp = tp->next)
223 pid_to_thread_id (ptid_t ptid)
225 struct thread_info *tp;
227 for (tp = thread_list; tp; tp = tp->next)
228 if (ptid_equal (tp->ptid, ptid))
235 thread_id_to_pid (int num)
237 struct thread_info *thread = find_thread_id (num);
241 return pid_to_ptid (-1);
245 in_thread_list (ptid_t ptid)
247 struct thread_info *tp;
249 for (tp = thread_list; tp; tp = tp->next)
250 if (ptid_equal (tp->ptid, ptid))
253 return 0; /* Never heard of 'im */
256 /* Print a list of thread ids currently known, and the total number of
257 threads. To be used from within catch_errors. */
259 do_captured_list_thread_ids (void *arg)
261 struct thread_info *tp;
264 ui_out_tuple_begin (uiout, "thread-ids");
266 for (tp = thread_list; tp; tp = tp->next)
269 ui_out_field_int (uiout, "thread-id", tp->num);
272 ui_out_tuple_end (uiout);
273 ui_out_field_int (uiout, "number-of-threads", num);
277 /* Official gdblib interface function to get a list of thread ids and
280 gdb_list_thread_ids (/* output object */)
282 return catch_errors (do_captured_list_thread_ids, NULL,
283 NULL, RETURN_MASK_ALL);
287 /* Load infrun state for the thread PID. */
290 load_infrun_state (ptid_t ptid,
292 CORE_ADDR *prev_func_start,
293 char **prev_func_name,
295 struct breakpoint **step_resume_breakpoint,
296 struct breakpoint **through_sigtramp_breakpoint,
297 CORE_ADDR *step_range_start,
298 CORE_ADDR *step_range_end,
299 CORE_ADDR *step_frame_address,
300 int *handling_longjmp,
302 int *stepping_through_solib_after_catch,
303 bpstat *stepping_through_solib_catchpoints,
304 int *stepping_through_sigtramp,
306 struct symtab **current_symtab,
309 struct thread_info *tp;
311 /* If we can't find the thread, then we're debugging a single threaded
312 process. No need to do anything in that case. */
313 tp = find_thread_id (pid_to_thread_id (ptid));
317 *prev_pc = tp->prev_pc;
318 *prev_func_start = tp->prev_func_start;
319 *prev_func_name = tp->prev_func_name;
320 *trap_expected = tp->trap_expected;
321 *step_resume_breakpoint = tp->step_resume_breakpoint;
322 *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
323 *step_range_start = tp->step_range_start;
324 *step_range_end = tp->step_range_end;
325 *step_frame_address = tp->step_frame_address;
326 *handling_longjmp = tp->handling_longjmp;
327 *another_trap = tp->another_trap;
328 *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;
329 *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;
330 *stepping_through_sigtramp = tp->stepping_through_sigtramp;
331 *current_line = tp->current_line;
332 *current_symtab = tp->current_symtab;
333 *step_sp = tp->step_sp;
336 /* Save infrun state for the thread PID. */
339 save_infrun_state (ptid_t ptid,
341 CORE_ADDR prev_func_start,
342 char *prev_func_name,
344 struct breakpoint *step_resume_breakpoint,
345 struct breakpoint *through_sigtramp_breakpoint,
346 CORE_ADDR step_range_start,
347 CORE_ADDR step_range_end,
348 CORE_ADDR step_frame_address,
349 int handling_longjmp,
351 int stepping_through_solib_after_catch,
352 bpstat stepping_through_solib_catchpoints,
353 int stepping_through_sigtramp,
355 struct symtab *current_symtab,
358 struct thread_info *tp;
360 /* If we can't find the thread, then we're debugging a single-threaded
361 process. Nothing to do in that case. */
362 tp = find_thread_id (pid_to_thread_id (ptid));
366 tp->prev_pc = prev_pc;
367 tp->prev_func_start = prev_func_start;
368 tp->prev_func_name = prev_func_name;
369 tp->trap_expected = trap_expected;
370 tp->step_resume_breakpoint = step_resume_breakpoint;
371 tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
372 tp->step_range_start = step_range_start;
373 tp->step_range_end = step_range_end;
374 tp->step_frame_address = step_frame_address;
375 tp->handling_longjmp = handling_longjmp;
376 tp->another_trap = another_trap;
377 tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
378 tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
379 tp->stepping_through_sigtramp = stepping_through_sigtramp;
380 tp->current_line = current_line;
381 tp->current_symtab = current_symtab;
382 tp->step_sp = step_sp;
385 /* Return true if TP is an active thread. */
387 thread_alive (struct thread_info *tp)
389 if (PIDGET (tp->ptid) == -1)
391 if (!target_thread_alive (tp->ptid))
393 tp->ptid = pid_to_ptid (-1); /* Mark it as dead */
402 struct thread_info *tp, *next;
404 for (tp = thread_list; tp; tp = next)
407 if (!thread_alive (tp))
408 delete_thread (tp->ptid);
412 /* Print information about currently known threads
414 * Note: this has the drawback that it _really_ switches
415 * threads, which frees the frame cache. A no-side
416 * effects info-threads command would be nicer.
420 info_threads_command (char *arg, int from_tty)
422 struct thread_info *tp;
424 struct frame_info *cur_frame;
425 int saved_frame_level = selected_frame_level;
429 /* Avoid coredumps which would happen if we tried to access a NULL
431 if (!target_has_stack)
435 target_find_new_threads ();
436 current_ptid = inferior_ptid;
437 for (tp = thread_list; tp; tp = tp->next)
439 if (ptid_equal (tp->ptid, current_ptid))
440 printf_filtered ("* ");
442 printf_filtered (" ");
445 printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid));
447 printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->ptid));
450 extra_info = target_extra_thread_info (tp);
452 printf_filtered (" (%s)", extra_info);
455 switch_to_thread (tp->ptid);
457 print_only_stack_frame (selected_frame, -1, 0);
459 printf_filtered ("[No stack.]\n");
462 switch_to_thread (current_ptid);
464 /* Code below copied from "up_silently_base" in "stack.c".
465 * It restores the frame set by the user before the "info threads"
466 * command. We have finished the info-threads display by switching
467 * back to the current thread. That switch has put us at the top
468 * of the stack (leaf frame).
470 counter = saved_frame_level;
471 cur_frame = find_relative_frame (selected_frame, &counter);
474 /* Ooops, can't restore, tell user where we are. */
475 warning ("Couldn't restore frame in current thread, at frame 0");
476 print_stack_frame (selected_frame, -1, 0);
480 select_frame (cur_frame, saved_frame_level);
483 /* re-show current frame. */
484 show_stack_frame (cur_frame);
487 /* Switch from one thread to another. */
490 switch_to_thread (ptid_t ptid)
492 if (ptid_equal (ptid, inferior_ptid))
495 inferior_ptid = ptid;
496 flush_cached_frames ();
497 registers_changed ();
498 stop_pc = read_pc ();
499 select_frame (get_current_frame (), 0);
503 restore_current_thread (ptid_t ptid)
505 if (! ptid_equal (ptid, inferior_ptid))
507 switch_to_thread (ptid);
508 print_stack_frame (get_current_frame (), 0, -1);
512 struct current_thread_cleanup
514 ptid_t inferior_ptid;
518 do_restore_current_thread_cleanup (void *arg)
520 struct current_thread_cleanup *old = arg;
521 restore_current_thread (old->inferior_ptid);
525 static struct cleanup *
526 make_cleanup_restore_current_thread (ptid_t inferior_ptid)
528 struct current_thread_cleanup *old
529 = xmalloc (sizeof (struct current_thread_cleanup));
530 old->inferior_ptid = inferior_ptid;
531 return make_cleanup (do_restore_current_thread_cleanup, old);
534 /* Apply a GDB command to a list of threads. List syntax is a whitespace
535 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
536 of two numbers seperated by a hyphen. Examples:
538 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
539 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
540 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
544 thread_apply_all_command (char *cmd, int from_tty)
546 struct thread_info *tp;
547 struct cleanup *old_chain;
548 struct cleanup *saved_cmd_cleanup_chain;
551 if (cmd == NULL || *cmd == '\000')
552 error ("Please specify a command following the thread ID list");
554 old_chain = make_cleanup_restore_current_thread (inferior_ptid);
556 /* It is safe to update the thread list now, before
557 traversing it for "thread apply all". MVS */
558 target_find_new_threads ();
560 /* Save a copy of the command in case it is clobbered by
562 saved_cmd = xstrdup (cmd);
563 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
564 for (tp = thread_list; tp; tp = tp->next)
565 if (thread_alive (tp))
567 switch_to_thread (tp->ptid);
569 printf_filtered ("\nThread %d (%s):\n",
571 target_tid_to_str (inferior_ptid));
573 printf_filtered ("\nThread %d (%s):\n", tp->num,
574 target_pid_to_str (inferior_ptid));
576 execute_command (cmd, from_tty);
577 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
580 do_cleanups (saved_cmd_cleanup_chain);
581 do_cleanups (old_chain);
585 thread_apply_command (char *tidlist, int from_tty)
589 struct cleanup *old_chain;
590 struct cleanup *saved_cmd_cleanup_chain;
593 if (tidlist == NULL || *tidlist == '\000')
594 error ("Please specify a thread ID list");
596 for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
599 error ("Please specify a command following the thread ID list");
601 old_chain = make_cleanup_restore_current_thread (inferior_ptid);
603 /* Save a copy of the command in case it is clobbered by
605 saved_cmd = xstrdup (cmd);
606 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
607 while (tidlist < cmd)
609 struct thread_info *tp;
612 start = strtol (tidlist, &p, 10);
614 error ("Error parsing %s", tidlist);
617 while (*tidlist == ' ' || *tidlist == '\t')
620 if (*tidlist == '-') /* Got a range of IDs? */
622 tidlist++; /* Skip the - */
623 end = strtol (tidlist, &p, 10);
625 error ("Error parsing %s", tidlist);
628 while (*tidlist == ' ' || *tidlist == '\t')
634 for (; start <= end; start++)
636 tp = find_thread_id (start);
639 warning ("Unknown thread %d.", start);
640 else if (!thread_alive (tp))
641 warning ("Thread %d has terminated.", start);
644 switch_to_thread (tp->ptid);
646 printf_filtered ("\nThread %d (%s):\n", tp->num,
647 target_tid_to_str (inferior_ptid));
649 printf_filtered ("\nThread %d (%s):\n", tp->num,
650 target_pid_to_str (inferior_ptid));
652 execute_command (cmd, from_tty);
653 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
658 do_cleanups (saved_cmd_cleanup_chain);
659 do_cleanups (old_chain);
662 /* Switch to the specified thread. Will dispatch off to thread_apply_command
663 if prefix of arg is `apply'. */
666 thread_command (char *tidstr, int from_tty)
670 /* Don't generate an error, just say which thread is current. */
671 if (target_has_stack)
672 printf_filtered ("[Current thread is %d (%s)]\n",
673 pid_to_thread_id (inferior_ptid),
674 #if defined(HPUXHPPA)
675 target_tid_to_str (inferior_ptid)
677 target_pid_to_str (inferior_ptid)
685 gdb_thread_select (tidstr);
689 do_captured_thread_select (void *tidstr)
692 struct thread_info *tp;
694 num = value_as_long (parse_and_eval (tidstr));
696 tp = find_thread_id (num);
700 error ("Thread ID %d not known.", num);
703 error ("Thread ID %d not known. Use the \"info threads\" command to\n\
704 see the IDs of currently known threads.", num);
707 if (!thread_alive (tp))
708 error ("Thread ID %d has terminated.\n", num);
710 switch_to_thread (tp->ptid);
713 ui_out_text (uiout, "[Switching to thread ");
714 ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
715 ui_out_text (uiout, " (");
716 #if defined(HPUXHPPA)
717 ui_out_text (uiout, target_tid_to_str (inferior_ptid));
719 ui_out_text (uiout, target_pid_to_str (inferior_ptid));
721 ui_out_text (uiout, ")]");
723 printf_filtered ("[Switching to thread %d (%s)]\n",
724 pid_to_thread_id (inferior_ptid),
725 #if defined(HPUXHPPA)
726 target_tid_to_str (inferior_ptid)
728 target_pid_to_str (inferior_ptid)
733 print_stack_frame (selected_frame, selected_frame_level, 1);
738 gdb_thread_select (char *tidstr)
740 return catch_errors (do_captured_thread_select, tidstr,
741 NULL, RETURN_MASK_ALL);
744 /* Commands with a prefix of `thread'. */
745 struct cmd_list_element *thread_cmd_list = NULL;
748 _initialize_thread (void)
750 static struct cmd_list_element *thread_apply_list = NULL;
752 add_info ("threads", info_threads_command,
753 "IDs of currently known threads.");
755 add_prefix_cmd ("thread", class_run, thread_command,
756 "Use this command to switch between threads.\n\
757 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
760 add_prefix_cmd ("apply", class_run, thread_apply_command,
761 "Apply a command to a list of threads.",
762 &thread_apply_list, "apply ", 1, &thread_cmd_list);
764 add_cmd ("all", class_run, thread_apply_all_command,
765 "Apply a command to all threads.",
769 add_com_alias ("t", "thread", class_run, 1);