1 /* Multi-process/thread control for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1988, 1993, 1998, 1999, 2000
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"
36 #include <sys/types.h>
42 /*#include "lynxos-core.h" */
44 /* Definition of struct thread_info exported to gdbthread.h */
46 /* Prototypes for exported functions. */
48 void _initialize_thread (void);
50 /* Prototypes for local functions. */
52 static struct thread_info *thread_list = NULL;
53 static int highest_thread_num;
55 static struct thread_info *find_thread_id (int num);
57 static void thread_command (char *tidstr, int from_tty);
58 static void thread_apply_all_command (char *, int);
59 static int thread_alive (struct thread_info *);
60 static void info_threads_command (char *, int);
61 static void thread_apply_command (char *, int);
62 static void restore_current_thread (int);
63 static void switch_to_thread (int pid);
64 static void prune_threads (void);
67 free_thread (struct thread_info *tp)
69 /* NOTE: this will take care of any left-over step_resume breakpoints,
70 but not any user-specified thread-specific breakpoints. */
71 if (tp->step_resume_breakpoint)
72 delete_breakpoint (tp->step_resume_breakpoint);
74 /* FIXME: do I ever need to call the back-end to give it a
75 chance at this private data before deleting the thread? */
83 init_thread_list (void)
85 struct thread_info *tp, *tpnext;
87 highest_thread_num = 0;
91 for (tp = thread_list; tp; tp = tpnext)
100 /* add_thread now returns a pointer to the new thread_info,
101 so that back_ends can initialize their private data. */
106 struct thread_info *tp;
108 tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
111 tp->num = ++highest_thread_num;
113 tp->prev_func_start = 0;
114 tp->prev_func_name = NULL;
115 tp->step_range_start = 0;
116 tp->step_range_end = 0;
117 tp->step_frame_address = 0;
118 tp->step_resume_breakpoint = 0;
119 tp->through_sigtramp_breakpoint = 0;
120 tp->handling_longjmp = 0;
121 tp->trap_expected = 0;
122 tp->another_trap = 0;
123 tp->stepping_through_solib_after_catch = 0;
124 tp->stepping_through_solib_catchpoints = NULL;
125 tp->stepping_through_sigtramp = 0;
126 tp->next = thread_list;
133 delete_thread (int pid)
135 struct thread_info *tp, *tpprev;
139 for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
147 tpprev->next = tp->next;
149 thread_list = tp->next;
154 static struct thread_info *
155 find_thread_id (int num)
157 struct thread_info *tp;
159 for (tp = thread_list; tp; tp = tp->next)
166 /* Find a thread_info by matching 'pid'. */
168 find_thread_pid (int pid)
170 struct thread_info *tp;
172 for (tp = thread_list; tp; tp = tp->next)
180 * Thread iterator function.
182 * Calls a callback function once for each thread, so long as
183 * the callback function returns false. If the callback function
184 * returns true, the iteration will end and the current thread
185 * will be returned. This can be useful for implementing a
186 * search for a thread with arbitrary attributes, or for applying
187 * some operation to every thread.
189 * FIXME: some of the existing functionality, such as
190 * "Thread apply all", might be rewritten using this functionality.
194 iterate_over_threads (int (*callback) (struct thread_info *, void *),
197 struct thread_info *tp;
199 for (tp = thread_list; tp; tp = tp->next)
200 if ((*callback) (tp, data))
207 valid_thread_id (int num)
209 struct thread_info *tp;
211 for (tp = thread_list; tp; tp = tp->next)
219 pid_to_thread_id (int pid)
221 struct thread_info *tp;
223 for (tp = thread_list; tp; tp = tp->next)
231 thread_id_to_pid (int num)
233 struct thread_info *thread = find_thread_id (num);
241 in_thread_list (int pid)
243 struct thread_info *tp;
245 for (tp = thread_list; tp; tp = tp->next)
249 return 0; /* Never heard of 'im */
252 /* Print a list of thread ids currently known, and the total number of
253 threads. To be used from within catch_errors. */
255 do_captured_list_thread_ids (void *arg)
257 struct thread_info *tp;
260 ui_out_list_begin (uiout, "thread-ids");
262 for (tp = thread_list; tp; tp = tp->next)
265 ui_out_field_int (uiout, "thread-id", tp->num);
268 ui_out_list_end (uiout);
269 ui_out_field_int (uiout, "number-of-threads", num);
273 /* Official gdblib interface function to get a list of thread ids and
276 gdb_list_thread_ids (/* output object */)
278 return catch_errors (do_captured_list_thread_ids, NULL,
279 NULL, RETURN_MASK_ALL);
283 /* Load infrun state for the thread PID. */
286 load_infrun_state (int pid, CORE_ADDR *prev_pc, CORE_ADDR *prev_func_start,
287 char **prev_func_name, int *trap_expected,
288 struct breakpoint **step_resume_breakpoint,
289 struct breakpoint **through_sigtramp_breakpoint,
290 CORE_ADDR *step_range_start, CORE_ADDR *step_range_end,
291 CORE_ADDR *step_frame_address, int *handling_longjmp,
292 int *another_trap, int *stepping_through_solib_after_catch,
293 bpstat *stepping_through_solib_catchpoints,
294 int *stepping_through_sigtramp)
296 struct thread_info *tp;
298 /* If we can't find the thread, then we're debugging a single threaded
299 process. No need to do anything in that case. */
300 tp = find_thread_id (pid_to_thread_id (pid));
304 *prev_pc = tp->prev_pc;
305 *prev_func_start = tp->prev_func_start;
306 *prev_func_name = tp->prev_func_name;
307 *step_resume_breakpoint = tp->step_resume_breakpoint;
308 *step_range_start = tp->step_range_start;
309 *step_range_end = tp->step_range_end;
310 *step_frame_address = tp->step_frame_address;
311 *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
312 *handling_longjmp = tp->handling_longjmp;
313 *trap_expected = tp->trap_expected;
314 *another_trap = tp->another_trap;
315 *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;
316 *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;
317 *stepping_through_sigtramp = tp->stepping_through_sigtramp;
320 /* Save infrun state for the thread PID. */
323 save_infrun_state (int pid, CORE_ADDR prev_pc, CORE_ADDR prev_func_start,
324 char *prev_func_name, int trap_expected,
325 struct breakpoint *step_resume_breakpoint,
326 struct breakpoint *through_sigtramp_breakpoint,
327 CORE_ADDR step_range_start, CORE_ADDR step_range_end,
328 CORE_ADDR step_frame_address, int handling_longjmp,
329 int another_trap, int stepping_through_solib_after_catch,
330 bpstat stepping_through_solib_catchpoints,
331 int stepping_through_sigtramp)
333 struct thread_info *tp;
335 /* If we can't find the thread, then we're debugging a single-threaded
336 process. Nothing to do in that case. */
337 tp = find_thread_id (pid_to_thread_id (pid));
341 tp->prev_pc = prev_pc;
342 tp->prev_func_start = prev_func_start;
343 tp->prev_func_name = prev_func_name;
344 tp->step_resume_breakpoint = step_resume_breakpoint;
345 tp->step_range_start = step_range_start;
346 tp->step_range_end = step_range_end;
347 tp->step_frame_address = step_frame_address;
348 tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
349 tp->handling_longjmp = handling_longjmp;
350 tp->trap_expected = trap_expected;
351 tp->another_trap = another_trap;
352 tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
353 tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
354 tp->stepping_through_sigtramp = stepping_through_sigtramp;
357 /* Return true if TP is an active thread. */
359 thread_alive (struct thread_info *tp)
363 if (!target_thread_alive (tp->pid))
365 tp->pid = -1; /* Mark it as dead */
374 struct thread_info *tp, *next;
376 for (tp = thread_list; tp; tp = next)
379 if (!thread_alive (tp))
380 delete_thread (tp->pid);
384 /* Print information about currently known threads
386 * Note: this has the drawback that it _really_ switches
387 * threads, which frees the frame cache. A no-side
388 * effects info-threads command would be nicer.
392 info_threads_command (char *arg, int from_tty)
394 struct thread_info *tp;
396 struct frame_info *cur_frame;
397 int saved_frame_level = selected_frame_level;
401 /* Avoid coredumps which would happen if we tried to access a NULL
403 if (!target_has_stack)
407 target_find_new_threads ();
408 current_pid = inferior_pid;
409 for (tp = thread_list; tp; tp = tp->next)
411 if (tp->pid == current_pid)
412 printf_filtered ("* ");
414 printf_filtered (" ");
417 printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->pid));
419 printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->pid));
422 extra_info = target_extra_thread_info (tp);
424 printf_filtered (" (%s)", extra_info);
427 switch_to_thread (tp->pid);
429 print_only_stack_frame (selected_frame, -1, 0);
431 printf_filtered ("[No stack.]\n");
434 switch_to_thread (current_pid);
436 /* Code below copied from "up_silently_base" in "stack.c".
437 * It restores the frame set by the user before the "info threads"
438 * command. We have finished the info-threads display by switching
439 * back to the current thread. That switch has put us at the top
440 * of the stack (leaf frame).
442 counter = saved_frame_level;
443 cur_frame = find_relative_frame (selected_frame, &counter);
446 /* Ooops, can't restore, tell user where we are. */
447 warning ("Couldn't restore frame in current thread, at frame 0");
448 print_stack_frame (selected_frame, -1, 0);
452 select_frame (cur_frame, saved_frame_level);
455 /* re-show current frame. */
456 show_stack_frame (cur_frame);
459 /* Switch from one thread to another. */
462 switch_to_thread (int pid)
464 if (pid == inferior_pid)
468 flush_cached_frames ();
469 registers_changed ();
470 stop_pc = read_pc ();
471 select_frame (get_current_frame (), 0);
475 restore_current_thread (int pid)
477 if (pid != inferior_pid)
479 switch_to_thread (pid);
480 print_stack_frame (get_current_frame (), 0, -1);
484 struct current_thread_cleanup
490 do_restore_current_thread_cleanup (void *arg)
492 struct current_thread_cleanup *old = arg;
493 restore_current_thread (old->inferior_pid);
497 static struct cleanup *
498 make_cleanup_restore_current_thread (int inferior_pid)
500 struct current_thread_cleanup *old
501 = xmalloc (sizeof (struct current_thread_cleanup));
502 old->inferior_pid = inferior_pid;
503 return make_cleanup (do_restore_current_thread_cleanup, old);
506 /* Apply a GDB command to a list of threads. List syntax is a whitespace
507 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
508 of two numbers seperated by a hyphen. Examples:
510 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
511 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
512 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
516 thread_apply_all_command (char *cmd, int from_tty)
518 struct thread_info *tp;
519 struct cleanup *old_chain;
520 struct cleanup *saved_cmd_cleanup_chain;
523 if (cmd == NULL || *cmd == '\000')
524 error ("Please specify a command following the thread ID list");
526 old_chain = make_cleanup_restore_current_thread (inferior_pid);
528 /* It is safe to update the thread list now, before
529 traversing it for "thread apply all". MVS */
530 target_find_new_threads ();
532 /* Save a copy of the command in case it is clobbered by
534 saved_cmd = strdup (cmd);
535 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
536 for (tp = thread_list; tp; tp = tp->next)
537 if (thread_alive (tp))
539 switch_to_thread (tp->pid);
541 printf_filtered ("\nThread %d (%s):\n",
543 target_tid_to_str (inferior_pid));
545 printf_filtered ("\nThread %d (%s):\n", tp->num,
546 target_pid_to_str (inferior_pid));
548 execute_command (cmd, from_tty);
549 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
552 do_cleanups (saved_cmd_cleanup_chain);
553 do_cleanups (old_chain);
557 thread_apply_command (char *tidlist, int from_tty)
561 struct cleanup *old_chain;
562 struct cleanup *saved_cmd_cleanup_chain;
565 if (tidlist == NULL || *tidlist == '\000')
566 error ("Please specify a thread ID list");
568 for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
571 error ("Please specify a command following the thread ID list");
573 old_chain = make_cleanup_restore_current_thread (inferior_pid);
575 /* Save a copy of the command in case it is clobbered by
577 saved_cmd = strdup (cmd);
578 saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
579 while (tidlist < cmd)
581 struct thread_info *tp;
584 start = strtol (tidlist, &p, 10);
586 error ("Error parsing %s", tidlist);
589 while (*tidlist == ' ' || *tidlist == '\t')
592 if (*tidlist == '-') /* Got a range of IDs? */
594 tidlist++; /* Skip the - */
595 end = strtol (tidlist, &p, 10);
597 error ("Error parsing %s", tidlist);
600 while (*tidlist == ' ' || *tidlist == '\t')
606 for (; start <= end; start++)
608 tp = find_thread_id (start);
611 warning ("Unknown thread %d.", start);
612 else if (!thread_alive (tp))
613 warning ("Thread %d has terminated.", start);
616 switch_to_thread (tp->pid);
618 printf_filtered ("\nThread %d (%s):\n", tp->num,
619 target_tid_to_str (inferior_pid));
621 printf_filtered ("\nThread %d (%s):\n", tp->num,
622 target_pid_to_str (inferior_pid));
624 execute_command (cmd, from_tty);
625 strcpy (cmd, saved_cmd); /* Restore exact command used previously */
630 do_cleanups (saved_cmd_cleanup_chain);
631 do_cleanups (old_chain);
634 /* Switch to the specified thread. Will dispatch off to thread_apply_command
635 if prefix of arg is `apply'. */
638 thread_command (char *tidstr, int from_tty)
642 /* Don't generate an error, just say which thread is current. */
643 if (target_has_stack)
644 printf_filtered ("[Current thread is %d (%s)]\n",
645 pid_to_thread_id (inferior_pid),
646 #if defined(HPUXHPPA)
647 target_tid_to_str (inferior_pid)
649 target_pid_to_str (inferior_pid)
657 gdb_thread_select (tidstr);
661 do_captured_thread_select (void *tidstr)
664 struct thread_info *tp;
666 num = atoi ((char *)tidstr);
668 tp = find_thread_id (num);
672 error ("Thread ID %d not known.", num);
675 error ("Thread ID %d not known. Use the \"info threads\" command to\n\
676 see the IDs of currently known threads.", num);
679 if (!thread_alive (tp))
680 error ("Thread ID %d has terminated.\n", num);
682 switch_to_thread (tp->pid);
685 ui_out_text (uiout, "[Switching to thread ");
686 ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_pid));
687 ui_out_text (uiout, " (");
688 #if defined(HPUXHPPA)
689 ui_out_text (uiout, target_tid_to_str (inferior_pid));
691 ui_out_text (uiout, target_pid_to_str (inferior_pid));
693 ui_out_text (uiout, ")]");
695 printf_filtered ("[Switching to thread %d (%s)]\n",
696 pid_to_thread_id (inferior_pid),
697 #if defined(HPUXHPPA)
698 target_tid_to_str (inferior_pid)
700 target_pid_to_str (inferior_pid)
705 print_stack_frame (selected_frame, selected_frame_level, 1);
710 gdb_thread_select (char *tidstr)
712 return catch_errors (do_captured_thread_select, tidstr,
713 NULL, RETURN_MASK_ALL);
716 /* Commands with a prefix of `thread'. */
717 struct cmd_list_element *thread_cmd_list = NULL;
720 _initialize_thread (void)
722 static struct cmd_list_element *thread_apply_list = NULL;
724 add_info ("threads", info_threads_command,
725 "IDs of currently known threads.");
727 add_prefix_cmd ("thread", class_run, thread_command,
728 "Use this command to switch between threads.\n\
729 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
732 add_prefix_cmd ("apply", class_run, thread_apply_command,
733 "Apply a command to a list of threads.",
734 &thread_apply_list, "apply ", 1, &thread_cmd_list);
736 add_cmd ("all", class_run, thread_apply_all_command,
737 "Apply a command to all threads.",
741 add_com_alias ("t", "thread", class_run, 1);