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 struct breakpoint
**through_sigtramp_breakpoint
,
298 CORE_ADDR
*step_range_start
,
299 CORE_ADDR
*step_range_end
,
300 struct frame_id
*step_frame_id
,
301 int *handling_longjmp
,
303 int *stepping_through_solib_after_catch
,
304 bpstat
*stepping_through_solib_catchpoints
,
305 int *stepping_through_sigtramp
,
307 struct symtab
**current_symtab
, CORE_ADDR
*step_sp
)
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 *trap_expected
= tp
->trap_expected
;
319 *step_resume_breakpoint
= tp
->step_resume_breakpoint
;
320 *through_sigtramp_breakpoint
= tp
->through_sigtramp_breakpoint
;
321 *step_range_start
= tp
->step_range_start
;
322 *step_range_end
= tp
->step_range_end
;
323 *step_frame_id
= tp
->step_frame_id
;
324 *handling_longjmp
= tp
->handling_longjmp
;
325 *another_trap
= tp
->another_trap
;
326 *stepping_through_solib_after_catch
=
327 tp
->stepping_through_solib_after_catch
;
328 *stepping_through_solib_catchpoints
=
329 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
,
342 struct breakpoint
*step_resume_breakpoint
,
343 struct breakpoint
*through_sigtramp_breakpoint
,
344 CORE_ADDR step_range_start
,
345 CORE_ADDR step_range_end
,
346 const struct frame_id
*step_frame_id
,
347 int handling_longjmp
,
349 int stepping_through_solib_after_catch
,
350 bpstat stepping_through_solib_catchpoints
,
351 int stepping_through_sigtramp
,
353 struct symtab
*current_symtab
, CORE_ADDR step_sp
)
355 struct thread_info
*tp
;
357 /* If we can't find the thread, then we're debugging a single-threaded
358 process. Nothing to do in that case. */
359 tp
= find_thread_id (pid_to_thread_id (ptid
));
363 tp
->prev_pc
= prev_pc
;
364 tp
->trap_expected
= trap_expected
;
365 tp
->step_resume_breakpoint
= step_resume_breakpoint
;
366 tp
->through_sigtramp_breakpoint
= through_sigtramp_breakpoint
;
367 tp
->step_range_start
= step_range_start
;
368 tp
->step_range_end
= step_range_end
;
369 tp
->step_frame_id
= (*step_frame_id
);
370 tp
->handling_longjmp
= handling_longjmp
;
371 tp
->another_trap
= another_trap
;
372 tp
->stepping_through_solib_after_catch
= stepping_through_solib_after_catch
;
373 tp
->stepping_through_solib_catchpoints
= stepping_through_solib_catchpoints
;
374 tp
->stepping_through_sigtramp
= stepping_through_sigtramp
;
375 tp
->current_line
= current_line
;
376 tp
->current_symtab
= current_symtab
;
377 tp
->step_sp
= step_sp
;
380 /* Return true if TP is an active thread. */
382 thread_alive (struct thread_info
*tp
)
384 if (PIDGET (tp
->ptid
) == -1)
386 if (!target_thread_alive (tp
->ptid
))
388 tp
->ptid
= pid_to_ptid (-1); /* Mark it as dead */
397 struct thread_info
*tp
, *next
;
399 for (tp
= thread_list
; tp
; tp
= next
)
402 if (!thread_alive (tp
))
403 delete_thread (tp
->ptid
);
407 /* Print information about currently known threads
409 * Note: this has the drawback that it _really_ switches
410 * threads, which frees the frame cache. A no-side
411 * effects info-threads command would be nicer.
415 info_threads_command (char *arg
, int from_tty
)
417 struct thread_info
*tp
;
419 struct frame_info
*cur_frame
;
420 struct frame_id saved_frame_id
= get_frame_id (get_selected_frame ());
424 target_find_new_threads ();
425 current_ptid
= inferior_ptid
;
426 for (tp
= thread_list
; tp
; tp
= tp
->next
)
428 if (ptid_equal (tp
->ptid
, current_ptid
))
429 printf_filtered ("* ");
431 printf_filtered (" ");
434 printf_filtered ("%d %s", tp
->num
, target_tid_to_str (tp
->ptid
));
436 printf_filtered ("%d %s", tp
->num
, target_pid_to_str (tp
->ptid
));
439 extra_info
= target_extra_thread_info (tp
);
441 printf_filtered (" (%s)", extra_info
);
444 switch_to_thread (tp
->ptid
);
445 print_stack_frame (get_selected_frame (), 0, LOCATION
);
448 switch_to_thread (current_ptid
);
450 /* Restores the frame set by the user before the "info threads"
451 command. We have finished the info-threads display by switching
452 back to the current thread. That switch has put us at the top of
453 the stack (leaf frame). */
454 cur_frame
= frame_find_by_id (saved_frame_id
);
455 if (cur_frame
== NULL
)
457 /* Ooops, can't restore, tell user where we are. */
458 warning ("Couldn't restore frame in current thread, at frame 0");
459 print_stack_frame (get_selected_frame (), 0, LOCATION
);
463 select_frame (cur_frame
);
464 /* re-show current frame. */
465 show_stack_frame (cur_frame
);
469 /* Switch from one thread to another. */
472 switch_to_thread (ptid_t ptid
)
474 if (ptid_equal (ptid
, inferior_ptid
))
477 inferior_ptid
= ptid
;
478 flush_cached_frames ();
479 registers_changed ();
480 stop_pc
= read_pc ();
481 select_frame (get_current_frame ());
485 restore_current_thread (ptid_t ptid
)
487 if (!ptid_equal (ptid
, inferior_ptid
))
489 switch_to_thread (ptid
);
490 print_stack_frame (get_current_frame (), 1, SRC_LINE
);
494 struct current_thread_cleanup
496 ptid_t inferior_ptid
;
500 do_restore_current_thread_cleanup (void *arg
)
502 struct current_thread_cleanup
*old
= arg
;
503 restore_current_thread (old
->inferior_ptid
);
507 static struct cleanup
*
508 make_cleanup_restore_current_thread (ptid_t inferior_ptid
)
510 struct current_thread_cleanup
*old
511 = xmalloc (sizeof (struct current_thread_cleanup
));
512 old
->inferior_ptid
= inferior_ptid
;
513 return make_cleanup (do_restore_current_thread_cleanup
, old
);
516 /* Apply a GDB command to a list of threads. List syntax is a whitespace
517 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
518 of two numbers seperated by a hyphen. Examples:
520 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
521 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
522 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
526 thread_apply_all_command (char *cmd
, int from_tty
)
528 struct thread_info
*tp
;
529 struct cleanup
*old_chain
;
530 struct cleanup
*saved_cmd_cleanup_chain
;
533 if (cmd
== NULL
|| *cmd
== '\000')
534 error ("Please specify a command following the thread ID list");
536 old_chain
= make_cleanup_restore_current_thread (inferior_ptid
);
538 /* It is safe to update the thread list now, before
539 traversing it for "thread apply all". MVS */
540 target_find_new_threads ();
542 /* Save a copy of the command in case it is clobbered by
544 saved_cmd
= xstrdup (cmd
);
545 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
546 for (tp
= thread_list
; tp
; tp
= tp
->next
)
547 if (thread_alive (tp
))
549 switch_to_thread (tp
->ptid
);
551 printf_filtered ("\nThread %d (%s):\n",
552 tp
->num
, target_tid_to_str (inferior_ptid
));
554 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
555 target_pid_to_str (inferior_ptid
));
557 execute_command (cmd
, from_tty
);
558 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
561 do_cleanups (saved_cmd_cleanup_chain
);
562 do_cleanups (old_chain
);
566 thread_apply_command (char *tidlist
, int from_tty
)
570 struct cleanup
*old_chain
;
571 struct cleanup
*saved_cmd_cleanup_chain
;
574 if (tidlist
== NULL
|| *tidlist
== '\000')
575 error ("Please specify a thread ID list");
577 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
580 error ("Please specify a command following the thread ID list");
582 old_chain
= make_cleanup_restore_current_thread (inferior_ptid
);
584 /* Save a copy of the command in case it is clobbered by
586 saved_cmd
= xstrdup (cmd
);
587 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
588 while (tidlist
< cmd
)
590 struct thread_info
*tp
;
593 start
= strtol (tidlist
, &p
, 10);
595 error ("Error parsing %s", tidlist
);
598 while (*tidlist
== ' ' || *tidlist
== '\t')
601 if (*tidlist
== '-') /* Got a range of IDs? */
603 tidlist
++; /* Skip the - */
604 end
= strtol (tidlist
, &p
, 10);
606 error ("Error parsing %s", tidlist
);
609 while (*tidlist
== ' ' || *tidlist
== '\t')
615 for (; start
<= end
; start
++)
617 tp
= find_thread_id (start
);
620 warning ("Unknown thread %d.", start
);
621 else if (!thread_alive (tp
))
622 warning ("Thread %d has terminated.", start
);
625 switch_to_thread (tp
->ptid
);
627 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
628 target_tid_to_str (inferior_ptid
));
630 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
631 target_pid_to_str (inferior_ptid
));
633 execute_command (cmd
, from_tty
);
634 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
639 do_cleanups (saved_cmd_cleanup_chain
);
640 do_cleanups (old_chain
);
643 /* Switch to the specified thread. Will dispatch off to thread_apply_command
644 if prefix of arg is `apply'. */
647 thread_command (char *tidstr
, int from_tty
)
651 /* Don't generate an error, just say which thread is current. */
652 if (target_has_stack
)
653 printf_filtered ("[Current thread is %d (%s)]\n",
654 pid_to_thread_id (inferior_ptid
),
655 #if defined(HPUXHPPA)
656 target_tid_to_str (inferior_ptid
)
658 target_pid_to_str (inferior_ptid
)
666 gdb_thread_select (uiout
, tidstr
);
670 do_captured_thread_select (struct ui_out
*uiout
, void *tidstr
)
673 struct thread_info
*tp
;
675 num
= value_as_long (parse_and_eval (tidstr
));
677 tp
= find_thread_id (num
);
680 error ("Thread ID %d not known.", num
);
682 if (!thread_alive (tp
))
683 error ("Thread ID %d has terminated.\n", num
);
685 switch_to_thread (tp
->ptid
);
687 ui_out_text (uiout
, "[Switching to thread ");
688 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
689 ui_out_text (uiout
, " (");
690 #if defined(HPUXHPPA)
691 ui_out_text (uiout
, target_tid_to_str (inferior_ptid
));
693 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
695 ui_out_text (uiout
, ")]");
697 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC
);
702 gdb_thread_select (struct ui_out
*uiout
, char *tidstr
)
704 return catch_exceptions (uiout
, do_captured_thread_select
, tidstr
,
705 NULL
, RETURN_MASK_ALL
);
708 /* Commands with a prefix of `thread'. */
709 struct cmd_list_element
*thread_cmd_list
= NULL
;
712 _initialize_thread (void)
714 static struct cmd_list_element
*thread_apply_list
= NULL
;
716 add_info ("threads", info_threads_command
,
717 "IDs of currently known threads.");
719 add_prefix_cmd ("thread", class_run
, thread_command
,
720 "Use this command to switch between threads.\n\
721 The new thread ID must be currently known.", &thread_cmd_list
, "thread ", 1, &cmdlist
);
723 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
724 "Apply a command to a list of threads.",
725 &thread_apply_list
, "apply ", 1, &thread_cmd_list
);
727 add_cmd ("all", class_run
, thread_apply_all_command
,
728 "Apply a command to all threads.", &thread_apply_list
);
731 add_com_alias ("t", "thread", class_run
, 1);