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     free (tp->private);
  78
  79   free (tp);
  80 }
  81
  82 void
  83 init_thread_list ()
  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 (pid)
 105      int pid;
 106 {
 107   struct thread_info *tp;
 108
 109   tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
 110
 111   tp->pid = pid;
 112   tp->num = ++highest_thread_num;
 113   tp->prev_pc = 0;
 114   tp->prev_func_start = 0;
 115   tp->prev_func_name = NULL;
 116   tp->step_range_start = 0;
 117   tp->step_range_end = 0;
 118   tp->step_frame_address = 0;
 119   tp->step_resume_breakpoint = 0;
 120   tp->through_sigtramp_breakpoint = 0;
 121   tp->handling_longjmp = 0;
 122   tp->trap_expected = 0;
 123   tp->another_trap = 0;
 124   tp->stepping_through_solib_after_catch = 0;
 125   tp->stepping_through_solib_catchpoints = NULL;
 126   tp->stepping_through_sigtramp = 0;
 127   tp->next = thread_list;
 128   tp->private = NULL;
 129   thread_list = tp;
 130   return tp;
 131 }
 132
 133 void
 134 delete_thread (pid)
 135      int pid;
 136 {
 137   struct thread_info *tp, *tpprev;
 138
 139   tpprev = NULL;
 140
 141   for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
 142     if (tp->pid == pid)
 143       break;
 144
 145   if (!tp)
 146     return;
 147
 148   if (tpprev)
 149     tpprev->next = tp->next;
 150   else
 151     thread_list = tp->next;
 152
 153   free_thread (tp);
 154 }
 155
 156 static struct thread_info *
 157 find_thread_id (num)
 158      int num;
 159 {
 160   struct thread_info *tp;
 161
 162   for (tp = thread_list; tp; tp = tp->next)
 163     if (tp->num == num)
 164       return tp;
 165
 166   return NULL;
 167 }
 168
 169 /* Find a thread_info by matching 'pid'.  */
 170 struct thread_info *
 171 find_thread_pid (pid)
 172      int pid;
 173 {
 174   struct thread_info *tp;
 175
 176   for (tp = thread_list; tp; tp = tp->next)
 177     if (tp->pid == pid)
 178       return tp;
 179
 180   return NULL;
 181 }
 182
 183 /*
 184  * Thread iterator function.
 185  *
 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.
 192  *
 193  * FIXME: some of the existing functionality, such as
 194  * "Thread apply all", might be rewritten using this functionality.
 195  */
 196
 197 struct thread_info *
 198 iterate_over_threads (callback, data)
 199      int (*callback) ();
 200      void *data;
 201 {
 202   struct thread_info *tp;
 203
 204   for (tp = thread_list; tp; tp = tp->next)
 205     if ((*callback) (tp, data))
 206       return tp;
 207
 208   return NULL;
 209 }
 210
 211 int
 212 valid_thread_id (num)
 213      int num;
 214 {
 215   struct thread_info *tp;
 216
 217   for (tp = thread_list; tp; tp = tp->next)
 218     if (tp->num == num)
 219       return 1;
 220
 221   return 0;
 222 }
 223
 224 int
 225 pid_to_thread_id (pid)
 226      int pid;
 227 {
 228   struct thread_info *tp;
 229
 230   for (tp = thread_list; tp; tp = tp->next)
 231     if (tp->pid == pid)
 232       return tp->num;
 233
 234   return 0;
 235 }
 236
 237 int
 238 thread_id_to_pid (num)
 239      int num;
 240 {
 241   struct thread_info *thread = find_thread_id (num);
 242   if (thread)
 243     return thread->pid;
 244   else
 245     return -1;
 246 }
 247
 248 int
 249 in_thread_list (pid)
 250      int pid;
 251 {
 252   struct thread_info *tp;
 253
 254   for (tp = thread_list; tp; tp = tp->next)
 255     if (tp->pid == pid)
 256       return 1;
 257
 258   return 0;                     /* Never heard of 'im */
 259 }
 260 #ifdef UI_OUT
 261 /* Print a list of thread ids currently known, and the total number of
 262    threads. To be used from within catch_errors. */
 263 static int
 264 do_captured_list_thread_ids (void *arg)
 265 {
 266   struct thread_info *tp;
 267   int num = 0;
 268
 269   ui_out_list_begin (uiout, "thread-ids");
 270
 271   for (tp = thread_list; tp; tp = tp->next)
 272     {
 273       num++;
 274       ui_out_field_int (uiout, "thread-id", tp->num);
 275     }
 276
 277   ui_out_list_end (uiout);
 278   ui_out_field_int (uiout, "number-of-threads", num);
 279   return GDB_RC_OK;
 280 }
 281
 282 /* Official gdblib interface function to get a list of thread ids and
 283    the total number. */
 284 enum gdb_rc
 285 gdb_list_thread_ids (/* output object */)
 286 {
 287   return catch_errors (do_captured_list_thread_ids, NULL,
 288                        NULL, RETURN_MASK_ALL);
 289 }
 290 #endif
 291
 292 /* Load infrun state for the thread PID.  */
 293
 294 void
 295 load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 296                    trap_expected, step_resume_breakpoint,
 297                    through_sigtramp_breakpoint, step_range_start,
 298                    step_range_end, step_frame_address,
 299                    handling_longjmp, another_trap,
 300                    stepping_through_solib_after_catch,
 301                    stepping_through_solib_catchpoints,
 302                    stepping_through_sigtramp)
 303      int pid;
 304      CORE_ADDR *prev_pc;
 305      CORE_ADDR *prev_func_start;
 306      char **prev_func_name;
 307      int *trap_expected;
 308      struct breakpoint **step_resume_breakpoint;
 309      struct breakpoint **through_sigtramp_breakpoint;
 310      CORE_ADDR *step_range_start;
 311      CORE_ADDR *step_range_end;
 312      CORE_ADDR *step_frame_address;
 313      int *handling_longjmp;
 314      int *another_trap;
 315      int *stepping_through_solib_after_catch;
 316      bpstat *stepping_through_solib_catchpoints;
 317      int *stepping_through_sigtramp;
 318 {
 319   struct thread_info *tp;
 320
 321   /* If we can't find the thread, then we're debugging a single threaded
 322      process.  No need to do anything in that case.  */
 323   tp = find_thread_id (pid_to_thread_id (pid));
 324   if (tp == NULL)
 325     return;
 326
 327   *prev_pc = tp->prev_pc;
 328   *prev_func_start = tp->prev_func_start;
 329   *prev_func_name = tp->prev_func_name;
 330   *step_resume_breakpoint = tp->step_resume_breakpoint;
 331   *step_range_start = tp->step_range_start;
 332   *step_range_end = tp->step_range_end;
 333   *step_frame_address = tp->step_frame_address;
 334   *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
 335   *handling_longjmp = tp->handling_longjmp;
 336   *trap_expected = tp->trap_expected;
 337   *another_trap = tp->another_trap;
 338   *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;
 339   *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;
 340   *stepping_through_sigtramp = tp->stepping_through_sigtramp;
 341 }
 342
 343 /* Save infrun state for the thread PID.  */
 344
 345 void
 346 save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
 347                    trap_expected, step_resume_breakpoint,
 348                    through_sigtramp_breakpoint, step_range_start,
 349                    step_range_end, step_frame_address,
 350                    handling_longjmp, another_trap,
 351                    stepping_through_solib_after_catch,
 352                    stepping_through_solib_catchpoints,
 353                    stepping_through_sigtramp)
 354      int pid;
 355      CORE_ADDR prev_pc;
 356      CORE_ADDR prev_func_start;
 357      char *prev_func_name;
 358      int trap_expected;
 359      struct breakpoint *step_resume_breakpoint;
 360      struct breakpoint *through_sigtramp_breakpoint;
 361      CORE_ADDR step_range_start;
 362      CORE_ADDR step_range_end;
 363      CORE_ADDR step_frame_address;
 364      int handling_longjmp;
 365      int another_trap;
 366      int stepping_through_solib_after_catch;
 367      bpstat stepping_through_solib_catchpoints;
 368      int stepping_through_sigtramp;
 369 {
 370   struct thread_info *tp;
 371
 372   /* If we can't find the thread, then we're debugging a single-threaded
 373      process.  Nothing to do in that case.  */
 374   tp = find_thread_id (pid_to_thread_id (pid));
 375   if (tp == NULL)
 376     return;
 377
 378   tp->prev_pc = prev_pc;
 379   tp->prev_func_start = prev_func_start;
 380   tp->prev_func_name = prev_func_name;
 381   tp->step_resume_breakpoint = step_resume_breakpoint;
 382   tp->step_range_start = step_range_start;
 383   tp->step_range_end = step_range_end;
 384   tp->step_frame_address = step_frame_address;
 385   tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
 386   tp->handling_longjmp = handling_longjmp;
 387   tp->trap_expected = trap_expected;
 388   tp->another_trap = another_trap;
 389   tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
 390   tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
 391   tp->stepping_through_sigtramp = stepping_through_sigtramp;
 392 }
 393
 394 /* Return true if TP is an active thread. */
 395 static int
 396 thread_alive (tp)
 397      struct thread_info *tp;
 398 {
 399   if (tp->pid == -1)
 400     return 0;
 401   if (!target_thread_alive (tp->pid))
 402     {
 403       tp->pid = -1;             /* Mark it as dead */
 404       return 0;
 405     }
 406   return 1;
 407 }
 408
 409 static void
 410 prune_threads ()
 411 {
 412   struct thread_info *tp, *next;
 413
 414   for (tp = thread_list; tp; tp = next)
 415     {
 416       next = tp->next;
 417       if (!thread_alive (tp))
 418         delete_thread (tp->pid);
 419     }
 420 }
 421
 422 /* Print information about currently known threads
 423
 424  * Note: this has the drawback that it _really_ switches
 425  *       threads, which frees the frame cache.  A no-side
 426  *       effects info-threads command would be nicer.
 427  */
 428
 429 static void
 430 info_threads_command (arg, from_tty)
 431      char *arg;
 432      int from_tty;
 433 {
 434   struct thread_info *tp;
 435   int current_pid;
 436   struct frame_info *cur_frame;
 437   int saved_frame_level = selected_frame_level;
 438   int counter;
 439   char *extra_info;
 440
 441   /* Avoid coredumps which would happen if we tried to access a NULL
 442      selected_frame.  */
 443   if (!target_has_stack)
 444     error ("No stack.");
 445
 446   prune_threads ();
 447   target_find_new_threads ();
 448   current_pid = inferior_pid;
 449   for (tp = thread_list; tp; tp = tp->next)
 450     {
 451       if (tp->pid == current_pid)
 452         printf_filtered ("* ");
 453       else
 454         printf_filtered ("  ");
 455
 456 #ifdef HPUXHPPA
 457       printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->pid));
 458 #else
 459       printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->pid));
 460 #endif
 461
 462       extra_info = target_extra_thread_info (tp);
 463       if (extra_info)
 464         printf_filtered (" (%s)", extra_info);
 465       puts_filtered ("  ");
 466
 467       switch_to_thread (tp->pid);
 468       if (selected_frame)
 469         print_only_stack_frame (selected_frame, -1, 0);
 470       else
 471         printf_filtered ("[No stack.]\n");
 472     }
 473
 474   switch_to_thread (current_pid);
 475
 476   /* Code below copied from "up_silently_base" in "stack.c".
 477    * It restores the frame set by the user before the "info threads"
 478    * command.  We have finished the info-threads display by switching
 479    * back to the current thread.  That switch has put us at the top
 480    * of the stack (leaf frame).
 481    */
 482   counter = saved_frame_level;
 483   cur_frame = find_relative_frame (selected_frame, &counter);
 484   if (counter != 0)
 485     {
 486       /* Ooops, can't restore, tell user where we are. */
 487       warning ("Couldn't restore frame in current thread, at frame 0");
 488       print_stack_frame (selected_frame, -1, 0);
 489     }
 490   else
 491     {
 492       select_frame (cur_frame, saved_frame_level);
 493     }
 494
 495   /* re-show current frame. */
 496   show_stack_frame (cur_frame);
 497 }
 498
 499 /* Switch from one thread to another. */
 500
 501 static void
 502 switch_to_thread (pid)
 503      int pid;
 504 {
 505   if (pid == inferior_pid)
 506     return;
 507
 508   inferior_pid = pid;
 509   flush_cached_frames ();
 510   registers_changed ();
 511   stop_pc = read_pc ();
 512   select_frame (get_current_frame (), 0);
 513 }
 514
 515 static void
 516 restore_current_thread (pid)
 517      int pid;
 518 {
 519   if (pid != inferior_pid)
 520     {
 521       switch_to_thread (pid);
 522       print_stack_frame (get_current_frame (), 0, -1);
 523     }
 524 }
 525
 526 struct current_thread_cleanup
 527 {
 528   int inferior_pid;
 529 };
 530
 531 static void
 532 do_restore_current_thread_cleanup (void *arg)
 533 {
 534   struct current_thread_cleanup *old = arg;
 535   restore_current_thread (old->inferior_pid);
 536   free (old);
 537 }
 538
 539 static struct cleanup *
 540 make_cleanup_restore_current_thread (int inferior_pid)
 541 {
 542   struct current_thread_cleanup *old
 543     = xmalloc (sizeof (struct current_thread_cleanup));
 544   old->inferior_pid = inferior_pid;
 545   return make_cleanup (do_restore_current_thread_cleanup, old);
 546 }
 547
 548 /* Apply a GDB command to a list of threads.  List syntax is a whitespace
 549    seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
 550    of two numbers seperated by a hyphen.  Examples:
 551
 552    thread apply 1 2 7 4 backtrace       Apply backtrace cmd to threads 1,2,7,4
 553    thread apply 2-7 9 p foo(1)  Apply p foo(1) cmd to threads 2->7 & 9
 554    thread apply all p x/i $pc   Apply x/i $pc cmd to all threads
 555  */
 556
 557 static void
 558 thread_apply_all_command (cmd, from_tty)
 559      char *cmd;
 560      int from_tty;
 561 {
 562   struct thread_info *tp;
 563   struct cleanup *old_chain;
 564
 565   if (cmd == NULL || *cmd == '\000')
 566     error ("Please specify a command following the thread ID list");
 567
 568   old_chain = make_cleanup_restore_current_thread (inferior_pid);
 569
 570   for (tp = thread_list; tp; tp = tp->next)
 571     if (thread_alive (tp))
 572       {
 573         switch_to_thread (tp->pid);
 574 #ifdef HPUXHPPA
 575         printf_filtered ("\nThread %d (%s):\n",
 576                          tp->num,
 577                          target_tid_to_str (inferior_pid));
 578 #else
 579         printf_filtered ("\nThread %d (%s):\n", tp->num,
 580                          target_pid_to_str (inferior_pid));
 581 #endif
 582         execute_command (cmd, from_tty);
 583       }
 584
 585   do_cleanups (old_chain);
 586 }
 587
 588 static void
 589 thread_apply_command (tidlist, from_tty)
 590      char *tidlist;
 591      int from_tty;
 592 {
 593   char *cmd;
 594   char *p;
 595   struct cleanup *old_chain;
 596
 597   if (tidlist == NULL || *tidlist == '\000')
 598     error ("Please specify a thread ID list");
 599
 600   for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
 601
 602   if (*cmd == '\000')
 603     error ("Please specify a command following the thread ID list");
 604
 605   old_chain = make_cleanup_restore_current_thread (inferior_pid);
 606
 607   while (tidlist < cmd)
 608     {
 609       struct thread_info *tp;
 610       int start, end;
 611
 612       start = strtol (tidlist, &p, 10);
 613       if (p == tidlist)
 614         error ("Error parsing %s", tidlist);
 615       tidlist = p;
 616
 617       while (*tidlist == ' ' || *tidlist == '\t')
 618         tidlist++;
 619
 620       if (*tidlist == '-')      /* Got a range of IDs? */
 621         {
 622           tidlist++;            /* Skip the - */
 623           end = strtol (tidlist, &p, 10);
 624           if (p == tidlist)
 625             error ("Error parsing %s", tidlist);
 626           tidlist = p;
 627
 628           while (*tidlist == ' ' || *tidlist == '\t')
 629             tidlist++;
 630         }
 631       else
 632         end = start;
 633
 634       for (; start <= end; start++)
 635         {
 636           tp = find_thread_id (start);
 637
 638           if (!tp)
 639             warning ("Unknown thread %d.", start);
 640           else if (!thread_alive (tp))
 641             warning ("Thread %d has terminated.", start);
 642           else
 643             {
 644               switch_to_thread (tp->pid);
 645 #ifdef HPUXHPPA
 646               printf_filtered ("\nThread %d (%s):\n", tp->num,
 647                                target_tid_to_str (inferior_pid));
 648 #else
 649               printf_filtered ("\nThread %d (%s):\n", tp->num,
 650                                target_pid_to_str (inferior_pid));
 651 #endif
 652               execute_command (cmd, from_tty);
 653             }
 654         }
 655     }
 656
 657   do_cleanups (old_chain);
 658 }
 659
 660 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 661    if prefix of arg is `apply'.  */
 662
 663 static void
 664 thread_command (tidstr, from_tty)
 665      char *tidstr;
 666      int from_tty;
 667 {
 668   if (!tidstr)
 669     {
 670       /* Don't generate an error, just say which thread is current. */
 671       if (target_has_stack)
 672         printf_filtered ("[Current thread is %d (%s)]\n",
 673                          pid_to_thread_id (inferior_pid),
 674 #if defined(HPUXHPPA)
 675                          target_tid_to_str (inferior_pid)
 676 #else
 677                          target_pid_to_str (inferior_pid)
 678 #endif
 679           );
 680       else
 681         error ("No stack.");
 682       return;
 683     }
 684
 685   gdb_thread_select (tidstr);
 686 }
 687
 688 static int
 689 do_captured_thread_select (void *tidstr)
 690 {
 691   int num;
 692   struct thread_info *tp;
 693
 694   num = atoi ((char *)tidstr);
 695
 696   tp = find_thread_id (num);
 697
 698 #ifdef UI_OUT
 699   if (!tp)
 700     error ("Thread ID %d not known.", num);
 701 #else
 702   if (!tp)
 703     error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
 704 see the IDs of currently known threads.", num);
 705 #endif
 706
 707   if (!thread_alive (tp))
 708     error ("Thread ID %d has terminated.\n", num);
 709
 710   switch_to_thread (tp->pid);
 711
 712 #ifdef UI_OUT
 713   ui_out_text (uiout, "[Switching to thread ");
 714   ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_pid));
 715   ui_out_text (uiout, " (");
 716 #if defined(HPUXHPPA)
 717   ui_out_text (uiout, target_tid_to_str (inferior_pid));
 718 #else
 719   ui_out_text (uiout, target_pid_to_str (inferior_pid));
 720 #endif
 721   ui_out_text (uiout, ")]");
 722 #else /* UI_OUT */
 723   printf_filtered ("[Switching to thread %d (%s)]\n",
 724                    pid_to_thread_id (inferior_pid),
 725 #if defined(HPUXHPPA)
 726                    target_tid_to_str (inferior_pid)
 727 #else
 728                    target_pid_to_str (inferior_pid)
 729 #endif
 730     );
 731 #endif /* UI_OUT */
 732
 733   print_stack_frame (selected_frame, selected_frame_level, 1);
 734   return GDB_RC_OK;
 735 }
 736
 737 enum gdb_rc
 738 gdb_thread_select (char *tidstr)
 739 {
 740   return catch_errors (do_captured_thread_select, tidstr,
 741                        NULL, RETURN_MASK_ALL);
 742 }
 743
 744 /* Commands with a prefix of `thread'.  */
 745 struct cmd_list_element *thread_cmd_list = NULL;
 746
 747 void
 748 _initialize_thread ()
 749 {
 750   static struct cmd_list_element *thread_apply_list = NULL;
 751
 752   add_info ("threads", info_threads_command,
 753             "IDs of currently known threads.");
 754
 755   add_prefix_cmd ("thread", class_run, thread_command,
 756                   "Use this command to switch between threads.\n\
 757 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
 758                   &cmdlist);
 759
 760   add_prefix_cmd ("apply", class_run, thread_apply_command,
 761                   "Apply a command to a list of threads.",
 762                   &thread_apply_list, "apply ", 1, &thread_cmd_list);
 763
 764   add_cmd ("all", class_run, thread_apply_all_command,
 765            "Apply a command to all threads.",
 766            &thread_apply_list);
 767
 768   if (!xdb_commands)
 769     add_com_alias ("t", "thread", class_run, 1);
 770 }