gdb/thread.c

   1 /* Multi-process/thread control for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1988, 1993, 1998, 1999, 2000
   3
   4    Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   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.
  13
  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.
  18
  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.  */
  23
  24 #include "defs.h"
  25 #include "symtab.h"
  26 #include "frame.h"
  27 #include "inferior.h"
  28 #include "environ.h"
  29 #include "value.h"
  30 #include "target.h"
  31 #include "gdbthread.h"
  32 #include "command.h"
  33 #include "gdbcmd.h"
  34
  35 #include <ctype.h>
  36 #include <sys/types.h>
  37 #include <signal.h>
  38 #ifdef UI_OUT
  39 #include "ui-out.h"
  40 #endif
  41
  42 /*#include "lynxos-core.h" */
  43
  44 /* Definition of struct thread_info exported to gdbthread.h */
  45
  46 /* Prototypes for exported functions. */
  47
  48 void _initialize_thread (void);
  49
  50 /* Prototypes for local functions. */
  51
  52 static struct thread_info *thread_list = NULL;
  53 static int highest_thread_num;
  54
  55 static struct thread_info *find_thread_id (int num);
  56
  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);
  65
  66 static void
  67 free_thread (struct thread_info *tp)
  68 {
  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);
  73
  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?  */
  76   if (tp->private)
  77     xfree (tp->private);
  78
  79   xfree (tp);
  80 }
  81
  82 void
  83 init_thread_list (void)
  84 {
  85   struct thread_info *tp, *tpnext;
  86
  87   highest_thread_num = 0;
  88   if (!thread_list)
  89     return;
  90
  91   for (tp = thread_list; tp; tp = tpnext)
  92     {
  93       tpnext = tp->next;
  94       free_thread (tp);
  95     }
  96
  97   thread_list = NULL;
  98 }
  99
 100 /* add_thread now returns a pointer to the new thread_info,
 101    so that back_ends can initialize their private data.  */
 102
 103 struct thread_info *
 104 add_thread (int pid)
 105 {
 106   struct thread_info *tp;
 107
 108   tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
 109
 110   tp->pid = pid;
 111   tp->num = ++highest_thread_num;
 112   tp->prev_pc = 0;
 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;
 127   tp->private = NULL;
 128   thread_list = tp;
 129   return tp;
 130 }
 131
 132 void
 133 delete_thread (int pid)
 134 {
 135   struct thread_info *tp, *tpprev;
 136
 137   tpprev = NULL;
 138
 139   for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
 140     if (tp->pid == pid)
 141       break;
 142
 143   if (!tp)
 144     return;
 145
 146   if (tpprev)
 147     tpprev->next = tp->next;
 148   else
 149     thread_list = tp->next;
 150
 151   free_thread (tp);
 152 }
 153
 154 static struct thread_info *
 155 find_thread_id (int num)
 156 {
 157   struct thread_info *tp;
 158
 159   for (tp = thread_list; tp; tp = tp->next)
 160     if (tp->num == num)
 161       return tp;
 162
 163   return NULL;
 164 }
 165
 166 /* Find a thread_info by matching 'pid'.  */
 167 struct thread_info *
 168 find_thread_pid (int pid)
 169 {
 170   struct thread_info *tp;
 171
 172   for (tp = thread_list; tp; tp = tp->next)
 173     if (tp->pid == pid)
 174       return tp;
 175
 176   return NULL;
 177 }
 178
 179 /*
 180  * Thread iterator function.
 181  *
 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.
 188  *
 189  * FIXME: some of the existing functionality, such as
 190  * "Thread apply all", might be rewritten using this functionality.
 191  */
 192
 193 struct thread_info *
 194 iterate_over_threads (int (*callback) (struct thread_info *, void *),
 195                       void *data)
 196 {
 197   struct thread_info *tp;
 198
 199   for (tp = thread_list; tp; tp = tp->next)
 200     if ((*callback) (tp, data))
 201       return tp;
 202
 203   return NULL;
 204 }
 205
 206 int
 207 valid_thread_id (int num)
 208 {
 209   struct thread_info *tp;
 210
 211   for (tp = thread_list; tp; tp = tp->next)
 212     if (tp->num == num)
 213       return 1;
 214
 215   return 0;
 216 }
 217
 218 int
 219 pid_to_thread_id (int pid)
 220 {
 221   struct thread_info *tp;
 222
 223   for (tp = thread_list; tp; tp = tp->next)
 224     if (tp->pid == pid)
 225       return tp->num;
 226
 227   return 0;
 228 }
 229
 230 int
 231 thread_id_to_pid (int num)
 232 {
 233   struct thread_info *thread = find_thread_id (num);
 234   if (thread)
 235     return thread->pid;
 236   else
 237     return -1;
 238 }
 239
 240 int
 241 in_thread_list (int pid)
 242 {
 243   struct thread_info *tp;
 244
 245   for (tp = thread_list; tp; tp = tp->next)
 246     if (tp->pid == pid)
 247       return 1;
 248
 249   return 0;                     /* Never heard of 'im */
 250 }
 251 #ifdef UI_OUT
 252 /* Print a list of thread ids currently known, and the total number of
 253    threads. To be used from within catch_errors. */
 254 static int
 255 do_captured_list_thread_ids (void *arg)
 256 {
 257   struct thread_info *tp;
 258   int num = 0;
 259
 260   ui_out_list_begin (uiout, "thread-ids");
 261
 262   for (tp = thread_list; tp; tp = tp->next)
 263     {
 264       num++;
 265       ui_out_field_int (uiout, "thread-id", tp->num);
 266     }
 267
 268   ui_out_list_end (uiout);
 269   ui_out_field_int (uiout, "number-of-threads", num);
 270   return GDB_RC_OK;
 271 }
 272
 273 /* Official gdblib interface function to get a list of thread ids and
 274    the total number. */
 275 enum gdb_rc
 276 gdb_list_thread_ids (/* output object */)
 277 {
 278   return catch_errors (do_captured_list_thread_ids, NULL,
 279                        NULL, RETURN_MASK_ALL);
 280 }
 281 #endif
 282
 283 /* Load infrun state for the thread PID.  */
 284
 285 void
 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)
 295 {
 296   struct thread_info *tp;
 297
 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));
 301   if (tp == NULL)
 302     return;
 303
 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;
 318 }
 319
 320 /* Save infrun state for the thread PID.  */
 321
 322 void
 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)
 332 {
 333   struct thread_info *tp;
 334
 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));
 338   if (tp == NULL)
 339     return;
 340
 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;
 355 }
 356
 357 /* Return true if TP is an active thread. */
 358 static int
 359 thread_alive (struct thread_info *tp)
 360 {
 361   if (tp->pid == -1)
 362     return 0;
 363   if (!target_thread_alive (tp->pid))
 364     {
 365       tp->pid = -1;             /* Mark it as dead */
 366       return 0;
 367     }
 368   return 1;
 369 }
 370
 371 static void
 372 prune_threads (void)
 373 {
 374   struct thread_info *tp, *next;
 375
 376   for (tp = thread_list; tp; tp = next)
 377     {
 378       next = tp->next;
 379       if (!thread_alive (tp))
 380         delete_thread (tp->pid);
 381     }
 382 }
 383
 384 /* Print information about currently known threads
 385
 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.
 389  */
 390
 391 static void
 392 info_threads_command (char *arg, int from_tty)
 393 {
 394   struct thread_info *tp;
 395   int current_pid;
 396   struct frame_info *cur_frame;
 397   int saved_frame_level = selected_frame_level;
 398   int counter;
 399   char *extra_info;
 400
 401   /* Avoid coredumps which would happen if we tried to access a NULL
 402      selected_frame.  */
 403   if (!target_has_stack)
 404     error ("No stack.");
 405
 406   prune_threads ();
 407   target_find_new_threads ();
 408   current_pid = inferior_pid;
 409   for (tp = thread_list; tp; tp = tp->next)
 410     {
 411       if (tp->pid == current_pid)
 412         printf_filtered ("* ");
 413       else
 414         printf_filtered ("  ");
 415
 416 #ifdef HPUXHPPA
 417       printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->pid));
 418 #else
 419       printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->pid));
 420 #endif
 421
 422       extra_info = target_extra_thread_info (tp);
 423       if (extra_info)
 424         printf_filtered (" (%s)", extra_info);
 425       puts_filtered ("  ");
 426
 427       switch_to_thread (tp->pid);
 428       if (selected_frame)
 429         print_only_stack_frame (selected_frame, -1, 0);
 430       else
 431         printf_filtered ("[No stack.]\n");
 432     }
 433
 434   switch_to_thread (current_pid);
 435
 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).
 441    */
 442   counter = saved_frame_level;
 443   cur_frame = find_relative_frame (selected_frame, &counter);
 444   if (counter != 0)
 445     {
 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);
 449     }
 450   else
 451     {
 452       select_frame (cur_frame, saved_frame_level);
 453     }
 454
 455   /* re-show current frame. */
 456   show_stack_frame (cur_frame);
 457 }
 458
 459 /* Switch from one thread to another. */
 460
 461 static void
 462 switch_to_thread (int pid)
 463 {
 464   if (pid == inferior_pid)
 465     return;
 466
 467   inferior_pid = pid;
 468   flush_cached_frames ();
 469   registers_changed ();
 470   stop_pc = read_pc ();
 471   select_frame (get_current_frame (), 0);
 472 }
 473
 474 static void
 475 restore_current_thread (int pid)
 476 {
 477   if (pid != inferior_pid)
 478     {
 479       switch_to_thread (pid);
 480       print_stack_frame (get_current_frame (), 0, -1);
 481     }
 482 }
 483
 484 struct current_thread_cleanup
 485 {
 486   int inferior_pid;
 487 };
 488
 489 static void
 490 do_restore_current_thread_cleanup (void *arg)
 491 {
 492   struct current_thread_cleanup *old = arg;
 493   restore_current_thread (old->inferior_pid);
 494   xfree (old);
 495 }
 496
 497 static struct cleanup *
 498 make_cleanup_restore_current_thread (int inferior_pid)
 499 {
 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);
 504 }
 505
 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:
 509
 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
 513  */
 514
 515 static void
 516 thread_apply_all_command (char *cmd, int from_tty)
 517 {
 518   struct thread_info *tp;
 519   struct cleanup *old_chain;
 520   struct cleanup *saved_cmd_cleanup_chain;
 521   char *saved_cmd;
 522
 523   if (cmd == NULL || *cmd == '\000')
 524     error ("Please specify a command following the thread ID list");
 525
 526   old_chain = make_cleanup_restore_current_thread (inferior_pid);
 527
 528   /* It is safe to update the thread list now, before
 529      traversing it for "thread apply all".  MVS */
 530   target_find_new_threads ();
 531
 532   /* Save a copy of the command in case it is clobbered by
 533      execute_command */
 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))
 538       {
 539         switch_to_thread (tp->pid);
 540 #ifdef HPUXHPPA
 541         printf_filtered ("\nThread %d (%s):\n",
 542                          tp->num,
 543                          target_tid_to_str (inferior_pid));
 544 #else
 545         printf_filtered ("\nThread %d (%s):\n", tp->num,
 546                          target_pid_to_str (inferior_pid));
 547 #endif
 548         execute_command (cmd, from_tty);
 549         strcpy (cmd, saved_cmd); /* Restore exact command used previously */
 550       }
 551
 552   do_cleanups (saved_cmd_cleanup_chain);
 553   do_cleanups (old_chain);
 554 }
 555
 556 static void
 557 thread_apply_command (char *tidlist, int from_tty)
 558 {
 559   char *cmd;
 560   char *p;
 561   struct cleanup *old_chain;
 562   struct cleanup *saved_cmd_cleanup_chain;
 563   char *saved_cmd;
 564
 565   if (tidlist == NULL || *tidlist == '\000')
 566     error ("Please specify a thread ID list");
 567
 568   for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
 569
 570   if (*cmd == '\000')
 571     error ("Please specify a command following the thread ID list");
 572
 573   old_chain = make_cleanup_restore_current_thread (inferior_pid);
 574
 575   /* Save a copy of the command in case it is clobbered by
 576      execute_command */
 577   saved_cmd = strdup (cmd);
 578   saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
 579   while (tidlist < cmd)
 580     {
 581       struct thread_info *tp;
 582       int start, end;
 583
 584       start = strtol (tidlist, &p, 10);
 585       if (p == tidlist)
 586         error ("Error parsing %s", tidlist);
 587       tidlist = p;
 588
 589       while (*tidlist == ' ' || *tidlist == '\t')
 590         tidlist++;
 591
 592       if (*tidlist == '-')      /* Got a range of IDs? */
 593         {
 594           tidlist++;            /* Skip the - */
 595           end = strtol (tidlist, &p, 10);
 596           if (p == tidlist)
 597             error ("Error parsing %s", tidlist);
 598           tidlist = p;
 599
 600           while (*tidlist == ' ' || *tidlist == '\t')
 601             tidlist++;
 602         }
 603       else
 604         end = start;
 605
 606       for (; start <= end; start++)
 607         {
 608           tp = find_thread_id (start);
 609
 610           if (!tp)
 611             warning ("Unknown thread %d.", start);
 612           else if (!thread_alive (tp))
 613             warning ("Thread %d has terminated.", start);
 614           else
 615             {
 616               switch_to_thread (tp->pid);
 617 #ifdef HPUXHPPA
 618               printf_filtered ("\nThread %d (%s):\n", tp->num,
 619                                target_tid_to_str (inferior_pid));
 620 #else
 621               printf_filtered ("\nThread %d (%s):\n", tp->num,
 622                                target_pid_to_str (inferior_pid));
 623 #endif
 624               execute_command (cmd, from_tty);
 625               strcpy (cmd, saved_cmd);  /* Restore exact command used previously */
 626             }
 627         }
 628     }
 629
 630   do_cleanups (saved_cmd_cleanup_chain);
 631   do_cleanups (old_chain);
 632 }
 633
 634 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 635    if prefix of arg is `apply'.  */
 636
 637 static void
 638 thread_command (char *tidstr, int from_tty)
 639 {
 640   if (!tidstr)
 641     {
 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)
 648 #else
 649                          target_pid_to_str (inferior_pid)
 650 #endif
 651           );
 652       else
 653         error ("No stack.");
 654       return;
 655     }
 656
 657   gdb_thread_select (tidstr);
 658 }
 659
 660 static int
 661 do_captured_thread_select (void *tidstr)
 662 {
 663   int num;
 664   struct thread_info *tp;
 665
 666   num = atoi ((char *)tidstr);
 667
 668   tp = find_thread_id (num);
 669
 670 #ifdef UI_OUT
 671   if (!tp)
 672     error ("Thread ID %d not known.", num);
 673 #else
 674   if (!tp)
 675     error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
 676 see the IDs of currently known threads.", num);
 677 #endif
 678
 679   if (!thread_alive (tp))
 680     error ("Thread ID %d has terminated.\n", num);
 681
 682   switch_to_thread (tp->pid);
 683
 684 #ifdef UI_OUT
 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));
 690 #else
 691   ui_out_text (uiout, target_pid_to_str (inferior_pid));
 692 #endif
 693   ui_out_text (uiout, ")]");
 694 #else /* UI_OUT */
 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)
 699 #else
 700                    target_pid_to_str (inferior_pid)
 701 #endif
 702     );
 703 #endif /* UI_OUT */
 704
 705   print_stack_frame (selected_frame, selected_frame_level, 1);
 706   return GDB_RC_OK;
 707 }
 708
 709 enum gdb_rc
 710 gdb_thread_select (char *tidstr)
 711 {
 712   return catch_errors (do_captured_thread_select, tidstr,
 713                        NULL, RETURN_MASK_ALL);
 714 }
 715
 716 /* Commands with a prefix of `thread'.  */
 717 struct cmd_list_element *thread_cmd_list = NULL;
 718
 719 void
 720 _initialize_thread (void)
 721 {
 722   static struct cmd_list_element *thread_apply_list = NULL;
 723
 724   add_info ("threads", info_threads_command,
 725             "IDs of currently known threads.");
 726
 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,
 730                   &cmdlist);
 731
 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);
 735
 736   add_cmd ("all", class_run, thread_apply_all_command,
 737            "Apply a command to all threads.",
 738            &thread_apply_list);
 739
 740   if (!xdb_commands)
 741     add_com_alias ("t", "thread", class_run, 1);
 742 }