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 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"
39 #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 (ptid_t
);
64 static void switch_to_thread (ptid_t ptid
);
65 static void prune_threads (void);
68 delete_step_resume_breakpoint (void *arg
)
70 struct breakpoint
**breakpointp
= (struct breakpoint
**) arg
;
71 struct thread_info
*tp
;
73 if (*breakpointp
!= NULL
)
75 delete_breakpoint (*breakpointp
);
76 for (tp
= thread_list
; tp
; tp
= tp
->next
)
77 if (tp
->step_resume_breakpoint
== *breakpointp
)
78 tp
->step_resume_breakpoint
= NULL
;
85 free_thread (struct thread_info
*tp
)
87 /* NOTE: this will take care of any left-over step_resume breakpoints,
88 but not any user-specified thread-specific breakpoints. */
89 if (tp
->step_resume_breakpoint
)
90 delete_breakpoint (tp
->step_resume_breakpoint
);
92 /* FIXME: do I ever need to call the back-end to give it a
93 chance at this private data before deleting the thread? */
101 init_thread_list (void)
103 struct thread_info
*tp
, *tpnext
;
105 highest_thread_num
= 0;
109 for (tp
= thread_list
; tp
; tp
= tpnext
)
118 /* add_thread now returns a pointer to the new thread_info,
119 so that back_ends can initialize their private data. */
122 add_thread (ptid_t ptid
)
124 struct thread_info
*tp
;
126 tp
= (struct thread_info
*) xmalloc (sizeof (*tp
));
127 memset (tp
, 0, sizeof (*tp
));
129 tp
->num
= ++highest_thread_num
;
130 tp
->next
= thread_list
;
136 delete_thread (ptid_t ptid
)
138 struct thread_info
*tp
, *tpprev
;
142 for (tp
= thread_list
; tp
; tpprev
= tp
, tp
= tp
->next
)
143 if (ptid_equal (tp
->ptid
, ptid
))
150 tpprev
->next
= tp
->next
;
152 thread_list
= tp
->next
;
157 static struct thread_info
*
158 find_thread_id (int num
)
160 struct thread_info
*tp
;
162 for (tp
= thread_list
; tp
; tp
= tp
->next
)
169 /* Find a thread_info by matching PTID. */
171 find_thread_pid (ptid_t ptid
)
173 struct thread_info
*tp
;
175 for (tp
= thread_list
; tp
; tp
= tp
->next
)
176 if (ptid_equal (tp
->ptid
, ptid
))
183 * Thread iterator function.
185 * Calls a callback function once for each thread, so long as
186 * the callback function returns false. If the callback function
187 * returns true, the iteration will end and the current thread
188 * will be returned. This can be useful for implementing a
189 * search for a thread with arbitrary attributes, or for applying
190 * some operation to every thread.
192 * FIXME: some of the existing functionality, such as
193 * "Thread apply all", might be rewritten using this functionality.
197 iterate_over_threads (int (*callback
) (struct thread_info
*, void *),
200 struct thread_info
*tp
;
202 for (tp
= thread_list
; tp
; tp
= tp
->next
)
203 if ((*callback
) (tp
, data
))
210 valid_thread_id (int num
)
212 struct thread_info
*tp
;
214 for (tp
= thread_list
; tp
; tp
= tp
->next
)
222 pid_to_thread_id (ptid_t ptid
)
224 struct thread_info
*tp
;
226 for (tp
= thread_list
; tp
; tp
= tp
->next
)
227 if (ptid_equal (tp
->ptid
, ptid
))
234 thread_id_to_pid (int num
)
236 struct thread_info
*thread
= find_thread_id (num
);
240 return pid_to_ptid (-1);
244 in_thread_list (ptid_t ptid
)
246 struct thread_info
*tp
;
248 for (tp
= thread_list
; tp
; tp
= tp
->next
)
249 if (ptid_equal (tp
->ptid
, ptid
))
252 return 0; /* Never heard of 'im */
255 /* Print a list of thread ids currently known, and the total number of
256 threads. To be used from within catch_errors. */
258 do_captured_list_thread_ids (struct ui_out
*uiout
,
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 (struct ui_out
*uiout
)
282 return catch_exceptions (uiout
, do_captured_list_thread_ids
, NULL
,
283 NULL
, RETURN_MASK_ALL
);
286 /* Load infrun state for the thread PID. */
289 load_infrun_state (ptid_t ptid
,
291 CORE_ADDR
*prev_func_start
,
292 char **prev_func_name
,
294 struct breakpoint
**step_resume_breakpoint
,
295 struct breakpoint
**through_sigtramp_breakpoint
,
296 CORE_ADDR
*step_range_start
,
297 CORE_ADDR
*step_range_end
,
298 CORE_ADDR
*step_frame_address
,
299 int *handling_longjmp
,
301 int *stepping_through_solib_after_catch
,
302 bpstat
*stepping_through_solib_catchpoints
,
303 int *stepping_through_sigtramp
,
305 struct symtab
**current_symtab
,
308 struct thread_info
*tp
;
310 /* If we can't find the thread, then we're debugging a single threaded
311 process. No need to do anything in that case. */
312 tp
= find_thread_id (pid_to_thread_id (ptid
));
316 *prev_pc
= tp
->prev_pc
;
317 *prev_func_start
= tp
->prev_func_start
;
318 *prev_func_name
= tp
->prev_func_name
;
319 *trap_expected
= tp
->trap_expected
;
320 *step_resume_breakpoint
= tp
->step_resume_breakpoint
;
321 *through_sigtramp_breakpoint
= tp
->through_sigtramp_breakpoint
;
322 *step_range_start
= tp
->step_range_start
;
323 *step_range_end
= tp
->step_range_end
;
324 *step_frame_address
= tp
->step_frame_address
;
325 *handling_longjmp
= tp
->handling_longjmp
;
326 *another_trap
= tp
->another_trap
;
327 *stepping_through_solib_after_catch
= tp
->stepping_through_solib_after_catch
;
328 *stepping_through_solib_catchpoints
= tp
->stepping_through_solib_catchpoints
;
329 *stepping_through_sigtramp
= tp
->stepping_through_sigtramp
;
330 *current_line
= tp
->current_line
;
331 *current_symtab
= tp
->current_symtab
;
332 *step_sp
= tp
->step_sp
;
335 /* Save infrun state for the thread PID. */
338 save_infrun_state (ptid_t ptid
,
340 CORE_ADDR prev_func_start
,
341 char *prev_func_name
,
343 struct breakpoint
*step_resume_breakpoint
,
344 struct breakpoint
*through_sigtramp_breakpoint
,
345 CORE_ADDR step_range_start
,
346 CORE_ADDR step_range_end
,
347 CORE_ADDR step_frame_address
,
348 int handling_longjmp
,
350 int stepping_through_solib_after_catch
,
351 bpstat stepping_through_solib_catchpoints
,
352 int stepping_through_sigtramp
,
354 struct symtab
*current_symtab
,
357 struct thread_info
*tp
;
359 /* If we can't find the thread, then we're debugging a single-threaded
360 process. Nothing to do in that case. */
361 tp
= find_thread_id (pid_to_thread_id (ptid
));
365 tp
->prev_pc
= prev_pc
;
366 tp
->prev_func_start
= prev_func_start
;
367 tp
->prev_func_name
= prev_func_name
;
368 tp
->trap_expected
= trap_expected
;
369 tp
->step_resume_breakpoint
= step_resume_breakpoint
;
370 tp
->through_sigtramp_breakpoint
= through_sigtramp_breakpoint
;
371 tp
->step_range_start
= step_range_start
;
372 tp
->step_range_end
= step_range_end
;
373 tp
->step_frame_address
= step_frame_address
;
374 tp
->handling_longjmp
= handling_longjmp
;
375 tp
->another_trap
= another_trap
;
376 tp
->stepping_through_solib_after_catch
= stepping_through_solib_after_catch
;
377 tp
->stepping_through_solib_catchpoints
= stepping_through_solib_catchpoints
;
378 tp
->stepping_through_sigtramp
= stepping_through_sigtramp
;
379 tp
->current_line
= current_line
;
380 tp
->current_symtab
= current_symtab
;
381 tp
->step_sp
= step_sp
;
384 /* Return true if TP is an active thread. */
386 thread_alive (struct thread_info
*tp
)
388 if (PIDGET (tp
->ptid
) == -1)
390 if (!target_thread_alive (tp
->ptid
))
392 tp
->ptid
= pid_to_ptid (-1); /* Mark it as dead */
401 struct thread_info
*tp
, *next
;
403 for (tp
= thread_list
; tp
; tp
= next
)
406 if (!thread_alive (tp
))
407 delete_thread (tp
->ptid
);
411 /* Print information about currently known threads
413 * Note: this has the drawback that it _really_ switches
414 * threads, which frees the frame cache. A no-side
415 * effects info-threads command would be nicer.
419 info_threads_command (char *arg
, int from_tty
)
421 struct thread_info
*tp
;
423 struct frame_info
*cur_frame
;
424 int saved_frame_level
= frame_relative_level (selected_frame
);
428 /* Avoid coredumps which would happen if we tried to access a NULL
430 if (!target_has_stack
)
434 target_find_new_threads ();
435 current_ptid
= inferior_ptid
;
436 for (tp
= thread_list
; tp
; tp
= tp
->next
)
438 if (ptid_equal (tp
->ptid
, current_ptid
))
439 printf_filtered ("* ");
441 printf_filtered (" ");
444 printf_filtered ("%d %s", tp
->num
, target_tid_to_str (tp
->ptid
));
446 printf_filtered ("%d %s", tp
->num
, target_pid_to_str (tp
->ptid
));
449 extra_info
= target_extra_thread_info (tp
);
451 printf_filtered (" (%s)", extra_info
);
454 switch_to_thread (tp
->ptid
);
456 print_only_stack_frame (selected_frame
, -1, 0);
458 printf_filtered ("[No stack.]\n");
461 switch_to_thread (current_ptid
);
463 /* Code below copied from "up_silently_base" in "stack.c".
464 * It restores the frame set by the user before the "info threads"
465 * command. We have finished the info-threads display by switching
466 * back to the current thread. That switch has put us at the top
467 * of the stack (leaf frame).
469 counter
= saved_frame_level
;
470 cur_frame
= find_relative_frame (selected_frame
, &counter
);
473 /* Ooops, can't restore, tell user where we are. */
474 warning ("Couldn't restore frame in current thread, at frame 0");
475 print_stack_frame (selected_frame
, -1, 0);
479 select_frame (cur_frame
);
482 /* re-show current frame. */
483 show_stack_frame (cur_frame
);
486 /* Switch from one thread to another. */
489 switch_to_thread (ptid_t ptid
)
491 if (ptid_equal (ptid
, inferior_ptid
))
494 inferior_ptid
= ptid
;
495 flush_cached_frames ();
496 registers_changed ();
497 stop_pc
= read_pc ();
498 select_frame (get_current_frame ());
502 restore_current_thread (ptid_t ptid
)
504 if (! ptid_equal (ptid
, inferior_ptid
))
506 switch_to_thread (ptid
);
507 print_stack_frame (get_current_frame (), 0, -1);
511 struct current_thread_cleanup
513 ptid_t inferior_ptid
;
517 do_restore_current_thread_cleanup (void *arg
)
519 struct current_thread_cleanup
*old
= arg
;
520 restore_current_thread (old
->inferior_ptid
);
524 static struct cleanup
*
525 make_cleanup_restore_current_thread (ptid_t inferior_ptid
)
527 struct current_thread_cleanup
*old
528 = xmalloc (sizeof (struct current_thread_cleanup
));
529 old
->inferior_ptid
= inferior_ptid
;
530 return make_cleanup (do_restore_current_thread_cleanup
, old
);
533 /* Apply a GDB command to a list of threads. List syntax is a whitespace
534 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
535 of two numbers seperated by a hyphen. Examples:
537 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
538 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
539 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
543 thread_apply_all_command (char *cmd
, int from_tty
)
545 struct thread_info
*tp
;
546 struct cleanup
*old_chain
;
547 struct cleanup
*saved_cmd_cleanup_chain
;
550 if (cmd
== NULL
|| *cmd
== '\000')
551 error ("Please specify a command following the thread ID list");
553 old_chain
= make_cleanup_restore_current_thread (inferior_ptid
);
555 /* It is safe to update the thread list now, before
556 traversing it for "thread apply all". MVS */
557 target_find_new_threads ();
559 /* Save a copy of the command in case it is clobbered by
561 saved_cmd
= xstrdup (cmd
);
562 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
563 for (tp
= thread_list
; tp
; tp
= tp
->next
)
564 if (thread_alive (tp
))
566 switch_to_thread (tp
->ptid
);
568 printf_filtered ("\nThread %d (%s):\n",
570 target_tid_to_str (inferior_ptid
));
572 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
573 target_pid_to_str (inferior_ptid
));
575 execute_command (cmd
, from_tty
);
576 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
579 do_cleanups (saved_cmd_cleanup_chain
);
580 do_cleanups (old_chain
);
584 thread_apply_command (char *tidlist
, int from_tty
)
588 struct cleanup
*old_chain
;
589 struct cleanup
*saved_cmd_cleanup_chain
;
592 if (tidlist
== NULL
|| *tidlist
== '\000')
593 error ("Please specify a thread ID list");
595 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
598 error ("Please specify a command following the thread ID list");
600 old_chain
= make_cleanup_restore_current_thread (inferior_ptid
);
602 /* Save a copy of the command in case it is clobbered by
604 saved_cmd
= xstrdup (cmd
);
605 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
606 while (tidlist
< cmd
)
608 struct thread_info
*tp
;
611 start
= strtol (tidlist
, &p
, 10);
613 error ("Error parsing %s", tidlist
);
616 while (*tidlist
== ' ' || *tidlist
== '\t')
619 if (*tidlist
== '-') /* Got a range of IDs? */
621 tidlist
++; /* Skip the - */
622 end
= strtol (tidlist
, &p
, 10);
624 error ("Error parsing %s", tidlist
);
627 while (*tidlist
== ' ' || *tidlist
== '\t')
633 for (; start
<= end
; start
++)
635 tp
= find_thread_id (start
);
638 warning ("Unknown thread %d.", start
);
639 else if (!thread_alive (tp
))
640 warning ("Thread %d has terminated.", start
);
643 switch_to_thread (tp
->ptid
);
645 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
646 target_tid_to_str (inferior_ptid
));
648 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
649 target_pid_to_str (inferior_ptid
));
651 execute_command (cmd
, from_tty
);
652 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
657 do_cleanups (saved_cmd_cleanup_chain
);
658 do_cleanups (old_chain
);
661 /* Switch to the specified thread. Will dispatch off to thread_apply_command
662 if prefix of arg is `apply'. */
665 thread_command (char *tidstr
, int from_tty
)
669 /* Don't generate an error, just say which thread is current. */
670 if (target_has_stack
)
671 printf_filtered ("[Current thread is %d (%s)]\n",
672 pid_to_thread_id (inferior_ptid
),
673 #if defined(HPUXHPPA)
674 target_tid_to_str (inferior_ptid
)
676 target_pid_to_str (inferior_ptid
)
684 gdb_thread_select (uiout
, tidstr
);
688 do_captured_thread_select (struct ui_out
*uiout
,
692 struct thread_info
*tp
;
694 num
= value_as_long (parse_and_eval (tidstr
));
696 tp
= find_thread_id (num
);
699 error ("Thread ID %d not known.", num
);
701 if (!thread_alive (tp
))
702 error ("Thread ID %d has terminated.\n", num
);
704 switch_to_thread (tp
->ptid
);
706 ui_out_text (uiout
, "[Switching to thread ");
707 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_ptid
));
708 ui_out_text (uiout
, " (");
709 #if defined(HPUXHPPA)
710 ui_out_text (uiout
, target_tid_to_str (inferior_ptid
));
712 ui_out_text (uiout
, target_pid_to_str (inferior_ptid
));
714 ui_out_text (uiout
, ")]");
716 print_stack_frame (selected_frame
, frame_relative_level (selected_frame
), 1);
721 gdb_thread_select (struct ui_out
*uiout
,
724 return catch_exceptions (uiout
, do_captured_thread_select
, tidstr
,
725 NULL
, RETURN_MASK_ALL
);
728 /* Commands with a prefix of `thread'. */
729 struct cmd_list_element
*thread_cmd_list
= NULL
;
732 _initialize_thread (void)
734 static struct cmd_list_element
*thread_apply_list
= NULL
;
736 add_info ("threads", info_threads_command
,
737 "IDs of currently known threads.");
739 add_prefix_cmd ("thread", class_run
, thread_command
,
740 "Use this command to switch between threads.\n\
741 The new thread ID must be currently known.", &thread_cmd_list
, "thread ", 1,
744 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
745 "Apply a command to a list of threads.",
746 &thread_apply_list
, "apply ", 1, &thread_cmd_list
);
748 add_cmd ("all", class_run
, thread_apply_all_command
,
749 "Apply a command to all threads.",
753 add_com_alias ("t", "thread", class_run
, 1);