1 /* Multi-process/thread control for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 Free Software Foundation, Inc.
5 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"
38 #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 (int);
65 static void switch_to_thread (int pid
);
66 static void prune_threads (void);
69 free_thread (struct thread_info
*tp
)
71 /* NOTE: this will take care of any left-over step_resume breakpoints,
72 but not any user-specified thread-specific breakpoints. */
73 if (tp
->step_resume_breakpoint
)
74 delete_breakpoint (tp
->step_resume_breakpoint
);
76 /* FIXME: do I ever need to call the back-end to give it a
77 chance at this private data before deleting the thread? */
85 init_thread_list (void)
87 struct thread_info
*tp
, *tpnext
;
89 highest_thread_num
= 0;
93 for (tp
= thread_list
; tp
; tp
= tpnext
)
102 /* add_thread now returns a pointer to the new thread_info,
103 so that back_ends can initialize their private data. */
108 struct thread_info
*tp
;
110 tp
= (struct thread_info
*) xmalloc (sizeof (struct thread_info
));
113 tp
->num
= ++highest_thread_num
;
115 tp
->prev_func_start
= 0;
116 tp
->prev_func_name
= NULL
;
117 tp
->step_range_start
= 0;
118 tp
->step_range_end
= 0;
119 tp
->step_frame_address
= 0;
120 tp
->step_resume_breakpoint
= 0;
121 tp
->through_sigtramp_breakpoint
= 0;
122 tp
->handling_longjmp
= 0;
123 tp
->trap_expected
= 0;
124 tp
->another_trap
= 0;
125 tp
->stepping_through_solib_after_catch
= 0;
126 tp
->stepping_through_solib_catchpoints
= NULL
;
127 tp
->stepping_through_sigtramp
= 0;
128 tp
->next
= thread_list
;
135 delete_thread (int pid
)
137 struct thread_info
*tp
, *tpprev
;
141 for (tp
= thread_list
; tp
; tpprev
= tp
, tp
= tp
->next
)
149 tpprev
->next
= tp
->next
;
151 thread_list
= tp
->next
;
156 static struct thread_info
*
157 find_thread_id (int num
)
159 struct thread_info
*tp
;
161 for (tp
= thread_list
; tp
; tp
= tp
->next
)
168 /* Find a thread_info by matching 'pid'. */
170 find_thread_pid (int pid
)
172 struct thread_info
*tp
;
174 for (tp
= thread_list
; tp
; tp
= tp
->next
)
182 * Thread iterator function.
184 * Calls a callback function once for each thread, so long as
185 * the callback function returns false. If the callback function
186 * returns true, the iteration will end and the current thread
187 * will be returned. This can be useful for implementing a
188 * search for a thread with arbitrary attributes, or for applying
189 * some operation to every thread.
191 * FIXME: some of the existing functionality, such as
192 * "Thread apply all", might be rewritten using this functionality.
196 iterate_over_threads (int (*callback
) (struct thread_info
*, void *),
199 struct thread_info
*tp
;
201 for (tp
= thread_list
; tp
; tp
= tp
->next
)
202 if ((*callback
) (tp
, data
))
209 valid_thread_id (int num
)
211 struct thread_info
*tp
;
213 for (tp
= thread_list
; tp
; tp
= tp
->next
)
221 pid_to_thread_id (int pid
)
223 struct thread_info
*tp
;
225 for (tp
= thread_list
; tp
; tp
= tp
->next
)
233 thread_id_to_pid (int num
)
235 struct thread_info
*thread
= find_thread_id (num
);
243 in_thread_list (int pid
)
245 struct thread_info
*tp
;
247 for (tp
= thread_list
; tp
; tp
= tp
->next
)
251 return 0; /* Never heard of 'im */
254 /* Print a list of thread ids currently known, and the total number of
255 threads. To be used from within catch_errors. */
257 do_captured_list_thread_ids (void *arg
)
259 struct thread_info
*tp
;
262 ui_out_list_begin (uiout
, "thread-ids");
264 for (tp
= thread_list
; tp
; tp
= tp
->next
)
267 ui_out_field_int (uiout
, "thread-id", tp
->num
);
270 ui_out_list_end (uiout
);
271 ui_out_field_int (uiout
, "number-of-threads", num
);
275 /* Official gdblib interface function to get a list of thread ids and
278 gdb_list_thread_ids (/* output object */)
280 return catch_errors (do_captured_list_thread_ids
, NULL
,
281 NULL
, RETURN_MASK_ALL
);
285 /* Load infrun state for the thread PID. */
288 load_infrun_state (int pid
, CORE_ADDR
*prev_pc
, CORE_ADDR
*prev_func_start
,
289 char **prev_func_name
, int *trap_expected
,
290 struct breakpoint
**step_resume_breakpoint
,
291 struct breakpoint
**through_sigtramp_breakpoint
,
292 CORE_ADDR
*step_range_start
, CORE_ADDR
*step_range_end
,
293 CORE_ADDR
*step_frame_address
, int *handling_longjmp
,
294 int *another_trap
, int *stepping_through_solib_after_catch
,
295 bpstat
*stepping_through_solib_catchpoints
,
296 int *stepping_through_sigtramp
)
298 struct thread_info
*tp
;
300 /* If we can't find the thread, then we're debugging a single threaded
301 process. No need to do anything in that case. */
302 tp
= find_thread_id (pid_to_thread_id (pid
));
306 *prev_pc
= tp
->prev_pc
;
307 *prev_func_start
= tp
->prev_func_start
;
308 *prev_func_name
= tp
->prev_func_name
;
309 *step_resume_breakpoint
= tp
->step_resume_breakpoint
;
310 *step_range_start
= tp
->step_range_start
;
311 *step_range_end
= tp
->step_range_end
;
312 *step_frame_address
= tp
->step_frame_address
;
313 *through_sigtramp_breakpoint
= tp
->through_sigtramp_breakpoint
;
314 *handling_longjmp
= tp
->handling_longjmp
;
315 *trap_expected
= tp
->trap_expected
;
316 *another_trap
= tp
->another_trap
;
317 *stepping_through_solib_after_catch
= tp
->stepping_through_solib_after_catch
;
318 *stepping_through_solib_catchpoints
= tp
->stepping_through_solib_catchpoints
;
319 *stepping_through_sigtramp
= tp
->stepping_through_sigtramp
;
322 /* Save infrun state for the thread PID. */
325 save_infrun_state (int pid
, CORE_ADDR prev_pc
, CORE_ADDR prev_func_start
,
326 char *prev_func_name
, int trap_expected
,
327 struct breakpoint
*step_resume_breakpoint
,
328 struct breakpoint
*through_sigtramp_breakpoint
,
329 CORE_ADDR step_range_start
, CORE_ADDR step_range_end
,
330 CORE_ADDR step_frame_address
, int handling_longjmp
,
331 int another_trap
, int stepping_through_solib_after_catch
,
332 bpstat stepping_through_solib_catchpoints
,
333 int stepping_through_sigtramp
)
335 struct thread_info
*tp
;
337 /* If we can't find the thread, then we're debugging a single-threaded
338 process. Nothing to do in that case. */
339 tp
= find_thread_id (pid_to_thread_id (pid
));
343 tp
->prev_pc
= prev_pc
;
344 tp
->prev_func_start
= prev_func_start
;
345 tp
->prev_func_name
= prev_func_name
;
346 tp
->step_resume_breakpoint
= step_resume_breakpoint
;
347 tp
->step_range_start
= step_range_start
;
348 tp
->step_range_end
= step_range_end
;
349 tp
->step_frame_address
= step_frame_address
;
350 tp
->through_sigtramp_breakpoint
= through_sigtramp_breakpoint
;
351 tp
->handling_longjmp
= handling_longjmp
;
352 tp
->trap_expected
= trap_expected
;
353 tp
->another_trap
= another_trap
;
354 tp
->stepping_through_solib_after_catch
= stepping_through_solib_after_catch
;
355 tp
->stepping_through_solib_catchpoints
= stepping_through_solib_catchpoints
;
356 tp
->stepping_through_sigtramp
= stepping_through_sigtramp
;
359 /* Return true if TP is an active thread. */
361 thread_alive (struct thread_info
*tp
)
365 if (!target_thread_alive (tp
->pid
))
367 tp
->pid
= -1; /* Mark it as dead */
376 struct thread_info
*tp
, *next
;
378 for (tp
= thread_list
; tp
; tp
= next
)
381 if (!thread_alive (tp
))
382 delete_thread (tp
->pid
);
386 /* Print information about currently known threads
388 * Note: this has the drawback that it _really_ switches
389 * threads, which frees the frame cache. A no-side
390 * effects info-threads command would be nicer.
394 info_threads_command (char *arg
, int from_tty
)
396 struct thread_info
*tp
;
398 struct frame_info
*cur_frame
;
399 int saved_frame_level
= selected_frame_level
;
403 /* Avoid coredumps which would happen if we tried to access a NULL
405 if (!target_has_stack
)
409 target_find_new_threads ();
410 current_pid
= inferior_pid
;
411 for (tp
= thread_list
; tp
; tp
= tp
->next
)
413 if (tp
->pid
== current_pid
)
414 printf_filtered ("* ");
416 printf_filtered (" ");
419 printf_filtered ("%d %s", tp
->num
, target_tid_to_str (tp
->pid
));
421 printf_filtered ("%d %s", tp
->num
, target_pid_to_str (tp
->pid
));
424 extra_info
= target_extra_thread_info (tp
);
426 printf_filtered (" (%s)", extra_info
);
429 switch_to_thread (tp
->pid
);
431 print_only_stack_frame (selected_frame
, -1, 0);
433 printf_filtered ("[No stack.]\n");
436 switch_to_thread (current_pid
);
438 /* Code below copied from "up_silently_base" in "stack.c".
439 * It restores the frame set by the user before the "info threads"
440 * command. We have finished the info-threads display by switching
441 * back to the current thread. That switch has put us at the top
442 * of the stack (leaf frame).
444 counter
= saved_frame_level
;
445 cur_frame
= find_relative_frame (selected_frame
, &counter
);
448 /* Ooops, can't restore, tell user where we are. */
449 warning ("Couldn't restore frame in current thread, at frame 0");
450 print_stack_frame (selected_frame
, -1, 0);
454 select_frame (cur_frame
, saved_frame_level
);
457 /* re-show current frame. */
458 show_stack_frame (cur_frame
);
461 /* Switch from one thread to another. */
464 switch_to_thread (int pid
)
466 if (pid
== inferior_pid
)
470 flush_cached_frames ();
471 registers_changed ();
472 stop_pc
= read_pc ();
473 select_frame (get_current_frame (), 0);
477 restore_current_thread (int pid
)
479 if (pid
!= inferior_pid
)
481 switch_to_thread (pid
);
482 print_stack_frame (get_current_frame (), 0, -1);
486 struct current_thread_cleanup
492 do_restore_current_thread_cleanup (void *arg
)
494 struct current_thread_cleanup
*old
= arg
;
495 restore_current_thread (old
->inferior_pid
);
499 static struct cleanup
*
500 make_cleanup_restore_current_thread (int inferior_pid
)
502 struct current_thread_cleanup
*old
503 = xmalloc (sizeof (struct current_thread_cleanup
));
504 old
->inferior_pid
= inferior_pid
;
505 return make_cleanup (do_restore_current_thread_cleanup
, old
);
508 /* Apply a GDB command to a list of threads. List syntax is a whitespace
509 seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
510 of two numbers seperated by a hyphen. Examples:
512 thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
513 thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
514 thread apply all p x/i $pc Apply x/i $pc cmd to all threads
518 thread_apply_all_command (char *cmd
, int from_tty
)
520 struct thread_info
*tp
;
521 struct cleanup
*old_chain
;
522 struct cleanup
*saved_cmd_cleanup_chain
;
525 if (cmd
== NULL
|| *cmd
== '\000')
526 error ("Please specify a command following the thread ID list");
528 old_chain
= make_cleanup_restore_current_thread (inferior_pid
);
530 /* It is safe to update the thread list now, before
531 traversing it for "thread apply all". MVS */
532 target_find_new_threads ();
534 /* Save a copy of the command in case it is clobbered by
536 saved_cmd
= xstrdup (cmd
);
537 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
538 for (tp
= thread_list
; tp
; tp
= tp
->next
)
539 if (thread_alive (tp
))
541 switch_to_thread (tp
->pid
);
543 printf_filtered ("\nThread %d (%s):\n",
545 target_tid_to_str (inferior_pid
));
547 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
548 target_pid_to_str (inferior_pid
));
550 execute_command (cmd
, from_tty
);
551 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
554 do_cleanups (saved_cmd_cleanup_chain
);
555 do_cleanups (old_chain
);
559 thread_apply_command (char *tidlist
, int from_tty
)
563 struct cleanup
*old_chain
;
564 struct cleanup
*saved_cmd_cleanup_chain
;
567 if (tidlist
== NULL
|| *tidlist
== '\000')
568 error ("Please specify a thread ID list");
570 for (cmd
= tidlist
; *cmd
!= '\000' && !isalpha (*cmd
); cmd
++);
573 error ("Please specify a command following the thread ID list");
575 old_chain
= make_cleanup_restore_current_thread (inferior_pid
);
577 /* Save a copy of the command in case it is clobbered by
579 saved_cmd
= xstrdup (cmd
);
580 saved_cmd_cleanup_chain
= make_cleanup (xfree
, (void *) saved_cmd
);
581 while (tidlist
< cmd
)
583 struct thread_info
*tp
;
586 start
= strtol (tidlist
, &p
, 10);
588 error ("Error parsing %s", tidlist
);
591 while (*tidlist
== ' ' || *tidlist
== '\t')
594 if (*tidlist
== '-') /* Got a range of IDs? */
596 tidlist
++; /* Skip the - */
597 end
= strtol (tidlist
, &p
, 10);
599 error ("Error parsing %s", tidlist
);
602 while (*tidlist
== ' ' || *tidlist
== '\t')
608 for (; start
<= end
; start
++)
610 tp
= find_thread_id (start
);
613 warning ("Unknown thread %d.", start
);
614 else if (!thread_alive (tp
))
615 warning ("Thread %d has terminated.", start
);
618 switch_to_thread (tp
->pid
);
620 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
621 target_tid_to_str (inferior_pid
));
623 printf_filtered ("\nThread %d (%s):\n", tp
->num
,
624 target_pid_to_str (inferior_pid
));
626 execute_command (cmd
, from_tty
);
627 strcpy (cmd
, saved_cmd
); /* Restore exact command used previously */
632 do_cleanups (saved_cmd_cleanup_chain
);
633 do_cleanups (old_chain
);
636 /* Switch to the specified thread. Will dispatch off to thread_apply_command
637 if prefix of arg is `apply'. */
640 thread_command (char *tidstr
, int from_tty
)
644 /* Don't generate an error, just say which thread is current. */
645 if (target_has_stack
)
646 printf_filtered ("[Current thread is %d (%s)]\n",
647 pid_to_thread_id (inferior_pid
),
648 #if defined(HPUXHPPA)
649 target_tid_to_str (inferior_pid
)
651 target_pid_to_str (inferior_pid
)
659 gdb_thread_select (tidstr
);
663 do_captured_thread_select (void *tidstr
)
666 struct thread_info
*tp
;
668 num
= atoi ((char *)tidstr
);
670 tp
= find_thread_id (num
);
674 error ("Thread ID %d not known.", num
);
677 error ("Thread ID %d not known. Use the \"info threads\" command to\n\
678 see the IDs of currently known threads.", num
);
681 if (!thread_alive (tp
))
682 error ("Thread ID %d has terminated.\n", num
);
684 switch_to_thread (tp
->pid
);
687 ui_out_text (uiout
, "[Switching to thread ");
688 ui_out_field_int (uiout
, "new-thread-id", pid_to_thread_id (inferior_pid
));
689 ui_out_text (uiout
, " (");
690 #if defined(HPUXHPPA)
691 ui_out_text (uiout
, target_tid_to_str (inferior_pid
));
693 ui_out_text (uiout
, target_pid_to_str (inferior_pid
));
695 ui_out_text (uiout
, ")]");
697 printf_filtered ("[Switching to thread %d (%s)]\n",
698 pid_to_thread_id (inferior_pid
),
699 #if defined(HPUXHPPA)
700 target_tid_to_str (inferior_pid
)
702 target_pid_to_str (inferior_pid
)
707 print_stack_frame (selected_frame
, selected_frame_level
, 1);
712 gdb_thread_select (char *tidstr
)
714 return catch_errors (do_captured_thread_select
, tidstr
,
715 NULL
, RETURN_MASK_ALL
);
718 /* Commands with a prefix of `thread'. */
719 struct cmd_list_element
*thread_cmd_list
= NULL
;
722 _initialize_thread (void)
724 static struct cmd_list_element
*thread_apply_list
= NULL
;
726 add_info ("threads", info_threads_command
,
727 "IDs of currently known threads.");
729 add_prefix_cmd ("thread", class_run
, thread_command
,
730 "Use this command to switch between threads.\n\
731 The new thread ID must be currently known.", &thread_cmd_list
, "thread ", 1,
734 add_prefix_cmd ("apply", class_run
, thread_apply_command
,
735 "Apply a command to a list of threads.",
736 &thread_apply_list
, "apply ", 1, &thread_cmd_list
);
738 add_cmd ("all", class_run
, thread_apply_all_command
,
739 "Apply a command to all threads.",
743 add_com_alias ("t", "thread", class_run
, 1);