1 /* Multi-process/thread control for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1988, 1993, 1998, 1999, 2000, 2001
4 Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
5 Free Software Foundation, Inc.
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 2 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, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
31 #include "gdbthread.h"
37 #include <sys/types.h>
43 /*#include "lynxos-core.h" */
45 /* Definition of struct thread_info exported to gdbthread.h */
47 /* Prototypes for exported functions. */
49 void _initialize_thread (void);
51 /* Prototypes for local functions. */
53 static struct thread_info *thread_list = NULL;
54 static int highest_thread_num;
56 static struct thread_info *find_thread_id (int num);
58 static void thread_command (char *tidstr, int from_tty);
59 static void thread_apply_all_command (char *, int);
60 static int thread_alive (struct thread_info *);
61 static void info_threads_command (char *, int);
62 static void thread_apply_command (char *, int);
63 static void restore_current_thread (int);
64 static void switch_to_thread (int pid);
65 static void prune_threads (void);
68 free_thread (struct thread_info *tp)
70 /* NOTE: this will take care of any left-over step_resume breakpoints,
71 but not any user-specified thread-specific breakpoints. */
72 if (tp->step_resume_breakpoint)
73 delete_breakpoint (tp->step_resume_breakpoint);
75 /* FIXME: do I ever need to call the back-end to give it a
76 chance at this private data before deleting the thread? */
84 init_thread_list (void)
86 struct thread_info *tp, *tpnext;
88 highest_thread_num = 0;
92 for (tp = thread_list; tp; tp = tpnext)
101 /* add_thread now returns a pointer to the new thread_info,
102 so that back_ends can initialize their private data. */
107 struct thread_info *tp;
109 tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
112 tp->num = ++highest_thread_num;
114 tp->prev_func_start = 0;
115 tp->prev_func_name = NULL;
116 tp->step_range_start = 0;
117 tp->step_range_end = 0;
118 tp->step_frame_address = 0;
119 tp->step_resume_breakpoint = 0;
120 tp->through_sigtramp_breakpoint = 0;
121 tp->handling_longjmp = 0;
122 tp->trap_expected = 0;
123 tp->another_trap = 0;
124 tp->stepping_through_solib_after_catch = 0;
125 tp->stepping_through_solib_catchpoints = NULL;
126 tp->stepping_through_sigtramp = 0;
127 tp->next = thread_list;
134 delete_thread (int pid)
136 struct thread_info *tp, *tpprev;
140 for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
148 tpprev->next = tp->next;
150 thread_list = tp->next;
155 static struct thread_info *
156 find_thread_id (int num)
158 struct thread_info *tp;
160 for (tp = thread_list; tp; tp = tp->next)
167 /* Find a thread_info by matching 'pid'. */
169 find_thread_pid (int pid)
171 struct thread_info *tp;
173 for (tp = thread_list; tp; tp = tp->next)
181 * Thread iterator function.
183 * Calls a callback function once for each thread, so long as
184 * the callback function returns false. If the callback function
185 * returns true, the iteration will end and the current thread
186 * will be returned. This can be useful for implementing a
187 * search for a thread with arbitrary attributes, or for applying
188 * some operation to every thread.
190 * FIXME: some of the existing functionality, such as
191 * "Thread apply all", might be rewritten using this functionality.
195 iterate_over_threads (int (*callback) (struct thread_info *, void *),
198 struct thread_info *tp;
200 for (tp = thread_list; tp; tp = tp->next)
201 if ((*callback) (tp, data))
208 valid_thread_id (int num)
210 struct thread_info *tp;
212 for (tp = thread_list; tp; tp = tp->next)
220 pid_to_thread_id (int pid)
222 struct thread_info *tp;
224 for (tp = thread_list; tp; tp = tp->next)
232 thread_id_to_pid (int num)
234 struct thread_info *thread = find_thread_id (num);
242 in_thread_list (int pid)
244 struct thread_info *tp;
246 for (tp = thread_list; tp; tp = tp->next)
250 return 0; /* Never heard of 'im */
253 /* Print a list of thread ids currently known, and the total number of
254 threads. To be used from within catch_errors. */
256 do_captured_list_thread_ids (void *arg)
258 struct thread_info *tp;
261 ui_out_list_begin (uiout, "thread-ids");
263 for (tp = thread_list; tp; tp = tp->next)
266 ui_out_field_int (uiout, "thread-id", tp->num);
269 ui_out_list_end (uiout);
270 ui_out_field_int (uiout, "number-of-threads", num);
274 /* Official gdblib interface function to get a list of thread ids and
277 gdb_list_thread_ids (/* output object */)
279 return catch_errors (do_captured_list_thread_ids, NULL,
280 NULL, RETURN_MASK_ALL);
284 /* Load infrun state for the thread PID. */
287 load_infrun_state (int pid, CORE_ADDR *prev_pc, CORE_ADDR *prev_func_start,
288 char **prev_func_name, int *trap_expected,
289 struct breakpoint **step_resume_breakpoint,
290 struct breakpoint **through_sigtramp_breakpoint,
291 CORE_ADDR *step_range_start, CORE_ADDR *step_range_end,
292 CORE_ADDR *step_frame_address, int *handling_longjmp,
293 int *another_trap, int *stepping_through_solib_after_catch,
294 bpstat *stepping_through_solib_catchpoints,
295 int *stepping_through_sigtramp)
297 struct thread_info *tp;
299 /* If we can't find the thread, then we're debugging a single threaded
300 process. No need to do anything in that case. */
301 tp = find_thread_id (pid_to_thread_id (pid));
305 *prev_pc = tp->prev_pc;
306 *prev_func_start = tp->prev_func_start;
307 *prev_func_name = tp->prev_func_name;
308 *step_resume_breakpoint = tp->step_resume_breakpoint;
309 *step_range_start = tp->step_range_start;
310 *step_range_end = tp->step_range_end;
311 *step_frame_address = tp->step_frame_address;
312 *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
313 *handling_longjmp = tp->handling_longjmp;
314 *trap_expected = tp->trap_expected;
315 *another_trap = tp->another_trap;
316 *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;
317 *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;
318 *stepping_through_sigtramp = tp->stepping_through_sigtramp;
321 /* Save infrun state for the thread PID. */
324 save_infrun_state (int pid, CORE_ADDR prev_pc, CORE_ADDR prev_func_start,
325 char *prev_func_name, int trap_expected,
326 struct breakpoint *step_resume_breakpoint,
327 struct breakpoint *through_sigtramp_breakpoint,
328 CORE_ADDR step_range_start, CORE_ADDR step_range_end,
329 CORE_ADDR step_frame_address, int handling_longjmp,
330 int another_trap, int stepping_through_solib_after_catch,
331 bpstat stepping_through_solib_catchpoints,
332 int stepping_through_sigtramp)
334 struct thread_info *tp;
336 /* If we can't find the thread, then we're debugging a single-threaded
337 process. Nothing to do in that case. */
338 tp = find_thread_id (pid_to_thread_id (pid));
342 tp->prev_pc = prev_pc;
343 tp->prev_func_start = prev_func_start;
344 tp->prev_func_name = prev_func_name;
345 tp->step_resume_breakpoint = step_resume_breakpoint;
346 tp->step_range_start = step_range_start;
347 tp->step_range_end = step_range_end;
348 tp->step_frame_address = step_frame_address;
349 tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
350 tp->handling_longjmp = handling_longjmp;
351 tp->trap_expected = trap_expected;
352 tp->another_trap = another_trap;
353 tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
354 tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
355 tp->stepping_through_sigtramp = stepping_through_sigtramp;
358 /* Return true if TP is an active thread. */
360 thread_alive (struct thread_info *tp)
364 if (!target_thread_alive (tp->pid))
366 tp->pid = -1; /* Mark it as dead */
375 struct thread_info *tp, *next;
377 for (tp = thread_list; tp; tp = next)
380 if (!thread_alive (tp))
381 delete_thread (tp->pid);
385 /* Print information about currently known threads
387 * Note: this has the drawback that it _really_ switches
388 * threads, which frees the frame cache. A no-side
389 * effects info-threads command would be nicer.
393 info_threads_command (char *arg, int from_tty)
395 struct thread_info *tp;
397 struct frame_info *cur_frame;
398 int saved_frame_level = selected_frame_level;
402 /* Avoid coredumps which would happen if we tried to access a NULL
404 if (!target_has_stack)
408 target_find_new_threads ();
409 current_pid = inferior_pid;
410 for (tp = thread_list; tp; tp = tp->next)
412 if (tp->pid == current_pid)
413 printf_filtered ("* ");
415 printf_filtered (" ");
418 printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->pid));
420 printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->pid));
423 extra_info = target_extra_thread_info (tp);
425 printf_filtered (" (%s)", extra_info);
428 switch_to_thread (tp->pid);
430 print_only_stack_frame (selected_frame, -1, 0);
432 printf_filtered ("[No stack.]\n");
435 switch_to_thread (current_pid);
437 /* Code below copied from "up_silently_base" in "stack.c".
438 * It restores the frame set by the user before the "info threads"
439 * command. We have finished the info-threads display by switching
440 * back to the current thread. That switch has put us at the top
441 * of the stack (leaf frame).
443 counter = saved_frame_level;
444 cur_frame = find_relative_frame (selected_frame, &counter);
447 /* Ooops, can't restore, tell user where we are. */
448 warning ("Couldn't restore frame in current thread, at frame 0");
449 print_stack_frame (selected_frame, -1, 0);
453 select_frame (cur_frame, saved_frame_level);
456 /* re-show current frame. */
457 show_stack_frame (cur_frame);
460 /* Switch from one thread to another. */
463 switch_to_thread (int pid)
465 if (pid == inferior_pid)
469 flush_cached_frames ();
470 registers_changed ();
471 stop_pc = read_pc ();
472 select_frame (get_current_frame (), 0);
476 restore_current_thread (int pid)
478 if (pid != inferior_pid)
480 switch_to_thread (pid);
481 print_stack_frame (get_current_frame (), 0, -1);
485 struct current_thread_cleanup
491 do_restore_current_thread_cleanup (void *arg)
493 struct current_thread_cleanup *old = arg;
494 restore_current_thread (old->inferior_pid);
498 static struct cleanup *
499 make_cleanup_restore_current_thread (int inferior_pid)
501 struct current_thread_cleanup *old
502 = xmalloc (sizeof (struct current_thread_cleanup));
503 old->inferior_pid = inferior_pid;
504 return make_cleanup (do_restore_current_thread_cleanup, old);
507 /* Apply a GDB command to a list of threads. List syntax is a whitespace
508 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
509 of two numbers seperated by a hyphen. Examples:
511 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
512 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
513 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
517 thread_apply_all_command (char *cmd, int from_tty)
519 struct thread_info *tp;
520 struct cleanup *old_chain;
521 struct cleanup *saved_cmd_cleanup_chain;
524 if (cmd == NULL || *cmd == '\000')
525 error ("Please specify a command following the thread ID list");
527 old_chain = make_cleanup_restore_current_thread (inferior_pid);
529 /* It is safe to update the thread list now, before
530 traversing it for "thread apply all". MVS */
531 target_find_new_threads ();
533 /* Save a copy of the command in case it is clobbered by
535 saved_cmd = xstrdup (cmd);
536 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
537 for (tp = thread_list; tp; tp = tp->next)
538 if (thread_alive (tp))
540 switch_to_thread (tp->pid);
542 printf_filtered ("\nThread %d (%s):\n",
544 target_tid_to_str (inferior_pid));
546 printf_filtered ("\nThread %d (%s):\n", tp->num,
547 target_pid_to_str (inferior_pid));
549 execute_command (cmd, from_tty);
550 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
553 do_cleanups (saved_cmd_cleanup_chain);
554 do_cleanups (old_chain);
558 thread_apply_command (char *tidlist, int from_tty)
562 struct cleanup *old_chain;
563 struct cleanup *saved_cmd_cleanup_chain;
566 if (tidlist == NULL || *tidlist == '\000')
567 error ("Please specify a thread ID list");
569 for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
572 error ("Please specify a command following the thread ID list");
574 old_chain = make_cleanup_restore_current_thread (inferior_pid);
576 /* Save a copy of the command in case it is clobbered by
578 saved_cmd = xstrdup (cmd);
579 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
580 while (tidlist < cmd)
582 struct thread_info *tp;
585 start = strtol (tidlist, &p, 10);
587 error ("Error parsing %s", tidlist);
590 while (*tidlist == ' ' || *tidlist == '\t')
593 if (*tidlist == '-') /* Got a range of IDs? */
595 tidlist++; /* Skip the - */
596 end = strtol (tidlist, &p, 10);
598 error ("Error parsing %s", tidlist);
601 while (*tidlist == ' ' || *tidlist == '\t')
607 for (; start <= end; start++)
609 tp = find_thread_id (start);
612 warning ("Unknown thread %d.", start);
613 else if (!thread_alive (tp))
614 warning ("Thread %d has terminated.", start);
617 switch_to_thread (tp->pid);
619 printf_filtered ("\nThread %d (%s):\n", tp->num,
620 target_tid_to_str (inferior_pid));
622 printf_filtered ("\nThread %d (%s):\n", tp->num,
623 target_pid_to_str (inferior_pid));
625 execute_command (cmd, from_tty);
626 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
631 do_cleanups (saved_cmd_cleanup_chain);
632 do_cleanups (old_chain);
635 /* Switch to the specified thread. Will dispatch off to thread_apply_command
636 if prefix of arg is `apply'. */
639 thread_command (char *tidstr, int from_tty)
643 /* Don't generate an error, just say which thread is current. */
644 if (target_has_stack)
645 printf_filtered ("[Current thread is %d (%s)]\n",
646 pid_to_thread_id (inferior_pid),
647 #if defined(HPUXHPPA)
648 target_tid_to_str (inferior_pid)
650 target_pid_to_str (inferior_pid)
658 gdb_thread_select (tidstr);
662 do_captured_thread_select (void *tidstr)
665 struct thread_info *tp;
667 num = atoi ((char *)tidstr);
669 tp = find_thread_id (num);
673 error ("Thread ID %d not known.", num);
676 error ("Thread ID %d not known. Use the \"info threads\" command to\n\
677 see the IDs of currently known threads.", num);
680 if (!thread_alive (tp))
681 error ("Thread ID %d has terminated.\n", num);
683 switch_to_thread (tp->pid);
686 ui_out_text (uiout, "[Switching to thread ");
687 ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_pid));
688 ui_out_text (uiout, " (");
689 #if defined(HPUXHPPA)
690 ui_out_text (uiout, target_tid_to_str (inferior_pid));
692 ui_out_text (uiout, target_pid_to_str (inferior_pid));
694 ui_out_text (uiout, ")]");
696 printf_filtered ("[Switching to thread %d (%s)]\n",
697 pid_to_thread_id (inferior_pid),
698 #if defined(HPUXHPPA)
699 target_tid_to_str (inferior_pid)
701 target_pid_to_str (inferior_pid)
706 print_stack_frame (selected_frame, selected_frame_level, 1);
711 gdb_thread_select (char *tidstr)
713 return catch_errors (do_captured_thread_select, tidstr,
714 NULL, RETURN_MASK_ALL);
717 /* Commands with a prefix of `thread'. */
718 struct cmd_list_element *thread_cmd_list = NULL;
721 _initialize_thread (void)
723 static struct cmd_list_element *thread_apply_list = NULL;
725 add_info ("threads", info_threads_command,
726 "IDs of currently known threads.");
728 add_prefix_cmd ("thread", class_run, thread_command,
729 "Use this command to switch between threads.\n\
730 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
733 add_prefix_cmd ("apply", class_run, thread_apply_command,
734 "Apply a command to a list of threads.",
735 &thread_apply_list, "apply ", 1, &thread_cmd_list);
737 add_cmd ("all", class_run, thread_apply_all_command,
738 "Apply a command to all threads.",
742 add_com_alias ("t", "thread", class_run, 1);