1 /* Multi-process/thread control for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
6 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"
37 #include "gdb_string.h"
40 #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 (struct ui_out
*uiout
, void *arg
)
261 struct thread_info
*tp
;
263 struct cleanup
*cleanup_chain
;
266 target_find_new_threads ();
268 cleanup_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "thread-ids");
270 for (tp
= thread_list
; tp
; tp
= tp
->next
)
273 ui_out_field_int (uiout
, "thread-id", tp
->num
);
276 do_cleanups (cleanup_chain
);
277 ui_out_field_int (uiout
, "number-of-threads", num
);
281 /* Official gdblib interface function to get a list of thread ids and
284 gdb_list_thread_ids (struct ui_out
*uiout
)
286 return catch_exceptions (uiout
, do_captured_list_thread_ids
, NULL
,
287 NULL
, RETURN_MASK_ALL
);
290 /* Load infrun state for the thread PID. */
293 load_infrun_state (ptid_t ptid
,
296 struct breakpoint
**step_resume_breakpoint
,
297 CORE_ADDR
*step_range_start
,
298 CORE_ADDR
*step_range_end
,
299 struct frame_id
*step_frame_id
,
300 int *handling_longjmp
,
302 int *stepping_through_solib_after_catch
,
303 bpstat
*stepping_through_solib_catchpoints
,
305 struct symtab
**current_symtab
)
307 struct thread_info
*tp
;
309 /* If we can't find the thread, then we're debugging a single threaded
310 process. No need to do anything in that case. */
311 tp
= find_thread_id (pid_to_thread_id (ptid
));
315 *prev_pc
= tp
->prev_pc
;
316 *trap_expected
= tp
->trap_expected
;
317 *step_resume_breakpoint
= tp
->step_resume_breakpoint
;
318 *step_range_start
= tp
->step_range_start
;
319 *step_range_end
= tp
->step_range_end
;
320 *step_frame_id
= tp
->step_frame_id
;
321 *handling_longjmp
= tp
->handling_longjmp
;
322 *another_trap
= tp
->another_trap
;
323 *stepping_through_solib_after_catch
=
324 tp
->stepping_through_solib_after_catch
;
325 *stepping_through_solib_catchpoints
=
326 tp
->stepping_through_solib_catchpoints
;
327 *current_line
= tp
->current_line
;
328 *current_symtab
= tp
->current_symtab
;
331 /* Save infrun state for the thread PID. */
334 save_infrun_state (ptid_t ptid
,
337 struct breakpoint
*step_resume_breakpoint
,
338 CORE_ADDR step_range_start
,
339 CORE_ADDR step_range_end
,
340 const struct frame_id
*step_frame_id
,
341 int handling_longjmp
,
343 int stepping_through_solib_after_catch
,
344 bpstat stepping_through_solib_catchpoints
,
346 struct symtab
*current_symtab
)
348 struct thread_info
*tp
;
350 /* If we can't find the thread, then we're debugging a single-threaded
351 process. Nothing to do in that case. */
352 tp
= find_thread_id (pid_to_thread_id (ptid
));
356 tp
->prev_pc
= prev_pc
;
357 tp
->trap_expected
= trap_expected
;
358 tp
->step_resume_breakpoint
= step_resume_breakpoint
;
359 tp
->step_range_start
= step_range_start
;
360 tp
->step_range_end
= step_range_end
;
361 tp
->step_frame_id
= (*step_frame_id
);
362 tp
->handling_longjmp
= handling_longjmp
;
363 tp
->another_trap
= another_trap
;
364 tp
->stepping_through_solib_after_catch
= stepping_through_solib_after_catch
;
365 tp
->stepping_through_solib_catchpoints
= stepping_through_solib_catchpoints
;
366 tp
->current_line
= current_line
;
367 tp
->current_symtab
= current_symtab
;
370 /* Return true if TP is an active thread. */
372 thread_alive (struct thread_info
*tp
)
374 if (PIDGET (tp
->ptid
) == -1)
376 if (!target_thread_alive (tp
->ptid
))
378 tp
->ptid
= pid_to_ptid (-1); /* Mark it as dead */
387 struct thread_info
*tp
, *next
;
389 for (tp
= thread_list
; tp
; tp
= next
)
392 if (!thread_alive (tp
))
393 delete_thread (tp
->ptid
);
397 /* Print information about currently known threads
399 * Note: this has the drawback that it _really_ switches
400 * threads, which frees the frame cache. A no-side
401 * effects info-threads command would be nicer.
405 info_threads_command (char *arg
, int from_tty
)
407 struct thread_info
*tp
;
409 struct frame_info
*cur_frame
;
410 struct frame_id saved_frame_id
= get_frame_id (get_selected_frame ());
414 target_find_new_threads ();
415 current_ptid
= inferior_ptid
;
416 for (tp
= thread_list
; tp
; tp
= tp
->next
)
418 if (ptid_equal (tp
->ptid
, current_ptid
))
419 printf_filtered ("* ");
421 printf_filtered (" ");
423 printf_filtered ("%d %s", tp
->num
, target_tid_to_str (tp
->ptid
));
425 extra_info
= target_extra_thread_info (tp
);
427 printf_filtered (" (%s)", extra_info
);
430 switch_to_thread (tp
->ptid
);
431 print_stack_frame (get_selected_frame (), 0, LOCATION
);
434 switch_to_thread (current_ptid
);
436 /* Restores the frame set by the user before the "info threads"
437 command. We have finished the info-threads display by switching
438 back to the current thread. That switch has put us at the top of
439 the stack (leaf frame). */
440 cur_frame
= frame_find_by_id (saved_frame_id
);
441 if (cur_frame
== NULL
)
443 /* Ooops, can't restore, tell user where we are. */
444 warning ("Couldn't restore frame in current thread, at frame 0");
445 print_stack_frame (get_selected_frame (), 0, LOCATION
);
449 select_frame (cur_frame
);
450 /* re-show current frame. */
451 show_stack_frame (cur_frame
);
455 /* Switch from one thread to another. */
458 switch_to_thread (ptid_t ptid
)
460 if (ptid_equal (ptid
, inferior_ptid
))
463 inferior_ptid
= ptid
;
464 flush_cached_frames ();
465 registers_changed ();
466 stop_pc
= read_pc ();
467 select_frame (get_current_frame ());
471 restore_current_thread (ptid_t ptid
)
473 if (!ptid_equal (ptid
, inferior_ptid
))
475 switch_to_thread (ptid
);
476 print_stack_frame (get_current_frame (), 1, SRC_LINE
);
480 struct current_thread_cleanup
482 ptid_t inferior_ptid
;
486 do_restore_current_thread_cleanup (void *arg
)
488 struct current_thread_cleanup
*old
= arg
;
489 restore_current_thread (old
->inferior_ptid
);
493 static struct cleanup
*
494 make_cleanup_restore_current_thread (ptid_t inferior_ptid
)
496 struct current_thread_cleanup
*old
497 = xmalloc (sizeof (struct current_thread_cleanup
));
498 old
->inferior_ptid
= inferior_ptid
;
499 return make_cleanup (do_restore_current_thread_cleanup
, old
);
502 /* Apply a GDB command to a list of threads. List syntax is a whitespace
503 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
504 of two numbers seperated by a hyphen. Examples:
506 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
507 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
508 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
512 thread_apply_all_command (char *cmd
, int from_tty
)
514 struct thread_info
*tp
;
515 struct cleanup
*old_chain
;
516 struct cleanup
*saved_cmd_cleanup_chain
;
519 if (cmd
== NULL
|| *cmd
== '\000')
520 error ("Please specify a command following the thread ID list");
522 old_chain
= make_cleanup_restore_current_thread (inferior_ptid
);
524 /* It is safe to update the thread list now, before
525 traversing it for "thread apply all". MVS */
526 target_find_new_threads ();
528 /* Save a copy of the command in case it is clobbered by
530 saved_cmd
= xstrdup (cmd
);
531 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
532 for (tp
= thread_list
; tp
; tp
= tp
->next
)
533 if (thread_alive (tp
))
535 switch_to_thread (tp
->ptid
);
536 printf_filtered ("\nThread %d (%s):\n",
537 tp
->num
, target_tid_to_str (inferior_ptid
));
538 execute_command (cmd
, from_tty
);
539 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
542 do_cleanups (saved_cmd_cleanup_chain
);
543 do_cleanups (old_chain
);
547 thread_apply_command (char *tidlist
, int from_tty
)
551 struct cleanup
*old_chain
;
552 struct cleanup
*saved_cmd_cleanup_chain
;
555 if (tidlist
== NULL
|| *tidlist
== '\000')
556 error ("Please specify a thread ID list");
558 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
561 error ("Please specify a command following the thread ID list");
563 old_chain
= make_cleanup_restore_current_thread (inferior_ptid
);
565 /* Save a copy of the command in case it is clobbered by
567 saved_cmd
= xstrdup (cmd
);
568 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
569 while (tidlist
< cmd
)
571 struct thread_info
*tp
;
574 start
= strtol (tidlist
, &p
, 10);
576 error ("Error parsing %s", tidlist
);
579 while (*tidlist
== ' ' || *tidlist
== '\t')
582 if (*tidlist
== '-') /* Got a range of IDs? */
584 tidlist
++; /* Skip the - */
585 end
= strtol (tidlist
, &p
, 10);
587 error ("Error parsing %s", tidlist
);
590 while (*tidlist
== ' ' || *tidlist
== '\t')
596 for (; start
<= end
; start
++)
598 tp
= find_thread_id (start
);
601 warning ("Unknown thread %d.", start
);
602 else if (!thread_alive (tp
))
603 warning ("Thread %d has terminated.", start
);
606 switch_to_thread (tp
->ptid
);
607 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
608 target_tid_to_str (inferior_ptid
));
609 execute_command (cmd
, from_tty
);
610 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
615 do_cleanups (saved_cmd_cleanup_chain
);
616 do_cleanups (old_chain
);
619 /* Switch to the specified thread. Will dispatch off to thread_apply_command
620 if prefix of arg is `apply'. */
623 thread_command (char *tidstr
, int from_tty
)
627 /* Don't generate an error, just say which thread is current. */
628 if (target_has_stack
)
629 printf_filtered ("[Current thread is %d (%s)]\n",
630 pid_to_thread_id (inferior_ptid
),
631 target_tid_to_str (inferior_ptid
));
637 gdb_thread_select (uiout
, tidstr
);
641 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
644 struct thread_info
*tp
;
646 num
= value_as_long (parse_and_eval (tidstr
));
648 tp
= find_thread_id (num
);
651 error ("Thread ID %d not known.", num
);
653 if (!thread_alive (tp
))
654 error ("Thread ID %d has terminated.\n", num
);
656 switch_to_thread (tp
->ptid
);
658 ui_out_text (uiout
, "[Switching to thread ");
659 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
660 ui_out_text (uiout
, " (");
661 ui_out_text (uiout
, target_tid_to_str (inferior_ptid
));
662 ui_out_text (uiout
, ")]");
664 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC
);
669 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
)
671 return catch_exceptions (uiout
, do_captured_thread_select
, tidstr
,
672 NULL
, RETURN_MASK_ALL
);
675 /* Commands with a prefix of `thread'. */
676 struct cmd_list_element
*thread_cmd_list
= NULL
;
679 _initialize_thread (void)
681 static struct cmd_list_element
*thread_apply_list
= NULL
;
683 add_info ("threads", info_threads_command
,
684 "IDs of currently known threads.");
686 add_prefix_cmd ("thread", class_run
, thread_command
,
687 "Use this command to switch between threads.\n\
688 The new thread ID must be currently known.", &thread_cmd_list
, "thread ", 1, &cmdlist
);
690 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
691 "Apply a command to a list of threads.",
692 &thread_apply_list
, "apply ", 1, &thread_cmd_list
);
694 add_cmd ("all", class_run
, thread_apply_all_command
,
695 "Apply a command to all threads.", &thread_apply_list
);
698 add_com_alias ("t", "thread", class_run
, 1);