gdb/thread.c

   1 /* Multi-process/thread control for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001, 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
   5
   6    Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
   7
   8    This file is part of GDB.
   9
  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 3 of the License, or
  13    (at your option) any later version.
  14
  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.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "symtab.h"
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "environ.h"
  28 #include "value.h"
  29 #include "target.h"
  30 #include "gdbthread.h"
  31 #include "exceptions.h"
  32 #include "command.h"
  33 #include "gdbcmd.h"
  34 #include "regcache.h"
  35 #include "gdb.h"
  36 #include "gdb_string.h"
  37
  38 #include <ctype.h>
  39 #include <sys/types.h>
  40 #include <signal.h>
  41 #include "ui-out.h"
  42
  43 /* Definition of struct thread_info exported to gdbthread.h */
  44
  45 /* Prototypes for exported functions. */
  46
  47 void _initialize_thread (void);
  48
  49 /* Prototypes for local functions. */
  50
  51 static struct thread_info *thread_list = NULL;
  52 static int highest_thread_num;
  53
  54 static struct thread_info *find_thread_id (int num);
  55
  56 static void thread_command (char *tidstr, int from_tty);
  57 static void thread_apply_all_command (char *, int);
  58 static int thread_alive (struct thread_info *);
  59 static void info_threads_command (char *, int);
  60 static void thread_apply_command (char *, int);
  61 static void restore_current_thread (ptid_t);
  62 static void prune_threads (void);
  63 static struct cleanup *make_cleanup_restore_current_thread (ptid_t,
  64                                                             struct frame_id);
  65
  66 void
  67 delete_step_resume_breakpoint (void *arg)
  68 {
  69   struct breakpoint **breakpointp = (struct breakpoint **) arg;
  70   struct thread_info *tp;
  71
  72   if (*breakpointp != NULL)
  73     {
  74       delete_breakpoint (*breakpointp);
  75       for (tp = thread_list; tp; tp = tp->next)
  76         if (tp->step_resume_breakpoint == *breakpointp)
  77           tp->step_resume_breakpoint = NULL;
  78
  79       *breakpointp = NULL;
  80     }
  81 }
  82
  83 static void
  84 free_thread (struct thread_info *tp)
  85 {
  86   /* NOTE: this will take care of any left-over step_resume breakpoints,
  87      but not any user-specified thread-specific breakpoints. */
  88   if (tp->step_resume_breakpoint)
  89     delete_breakpoint (tp->step_resume_breakpoint);
  90
  91   /* FIXME: do I ever need to call the back-end to give it a
  92      chance at this private data before deleting the thread?  */
  93   if (tp->private)
  94     xfree (tp->private);
  95
  96   xfree (tp);
  97 }
  98
  99 void
 100 init_thread_list (void)
 101 {
 102   struct thread_info *tp, *tpnext;
 103
 104   highest_thread_num = 0;
 105   if (!thread_list)
 106     return;
 107
 108   for (tp = thread_list; tp; tp = tpnext)
 109     {
 110       tpnext = tp->next;
 111       free_thread (tp);
 112     }
 113
 114   thread_list = NULL;
 115 }
 116
 117 /* add_thread now returns a pointer to the new thread_info,
 118    so that back_ends can initialize their private data.  */
 119
 120 struct thread_info *
 121 add_thread (ptid_t ptid)
 122 {
 123   struct thread_info *tp;
 124
 125   tp = (struct thread_info *) xmalloc (sizeof (*tp));
 126   memset (tp, 0, sizeof (*tp));
 127   tp->ptid = ptid;
 128   tp->num = ++highest_thread_num;
 129   tp->next = thread_list;
 130   thread_list = tp;
 131   return tp;
 132 }
 133
 134 void
 135 delete_thread (ptid_t ptid)
 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 (ptid_equal (tp->ptid, ptid))
 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 (int num)
 158 {
 159   struct thread_info *tp;
 160
 161   for (tp = thread_list; tp; tp = tp->next)
 162     if (tp->num == num)
 163       return tp;
 164
 165   return NULL;
 166 }
 167
 168 /* Find a thread_info by matching PTID.  */
 169 struct thread_info *
 170 find_thread_pid (ptid_t ptid)
 171 {
 172   struct thread_info *tp;
 173
 174   for (tp = thread_list; tp; tp = tp->next)
 175     if (ptid_equal (tp->ptid, ptid))
 176       return tp;
 177
 178   return NULL;
 179 }
 180
 181 /*
 182  * Thread iterator function.
 183  *
 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.
 190  *
 191  * FIXME: some of the existing functionality, such as
 192  * "Thread apply all", might be rewritten using this functionality.
 193  */
 194
 195 struct thread_info *
 196 iterate_over_threads (int (*callback) (struct thread_info *, void *),
 197                       void *data)
 198 {
 199   struct thread_info *tp;
 200
 201   for (tp = thread_list; tp; tp = tp->next)
 202     if ((*callback) (tp, data))
 203       return tp;
 204
 205   return NULL;
 206 }
 207
 208 int
 209 valid_thread_id (int num)
 210 {
 211   struct thread_info *tp;
 212
 213   for (tp = thread_list; tp; tp = tp->next)
 214     if (tp->num == num)
 215       return 1;
 216
 217   return 0;
 218 }
 219
 220 int
 221 pid_to_thread_id (ptid_t ptid)
 222 {
 223   struct thread_info *tp;
 224
 225   for (tp = thread_list; tp; tp = tp->next)
 226     if (ptid_equal (tp->ptid, ptid))
 227       return tp->num;
 228
 229   return 0;
 230 }
 231
 232 ptid_t
 233 thread_id_to_pid (int num)
 234 {
 235   struct thread_info *thread = find_thread_id (num);
 236   if (thread)
 237     return thread->ptid;
 238   else
 239     return pid_to_ptid (-1);
 240 }
 241
 242 int
 243 in_thread_list (ptid_t ptid)
 244 {
 245   struct thread_info *tp;
 246
 247   for (tp = thread_list; tp; tp = tp->next)
 248     if (ptid_equal (tp->ptid, ptid))
 249       return 1;
 250
 251   return 0;                     /* Never heard of 'im */
 252 }
 253
 254 /* Print a list of thread ids currently known, and the total number of
 255    threads. To be used from within catch_errors. */
 256 static int
 257 do_captured_list_thread_ids (struct ui_out *uiout, void *arg)
 258 {
 259   struct thread_info *tp;
 260   int num = 0;
 261   struct cleanup *cleanup_chain;
 262
 263   prune_threads ();
 264   target_find_new_threads ();
 265
 266   cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");
 267
 268   for (tp = thread_list; tp; tp = tp->next)
 269     {
 270       num++;
 271       ui_out_field_int (uiout, "thread-id", tp->num);
 272     }
 273
 274   do_cleanups (cleanup_chain);
 275   ui_out_field_int (uiout, "number-of-threads", num);
 276   return GDB_RC_OK;
 277 }
 278
 279 /* Official gdblib interface function to get a list of thread ids and
 280    the total number. */
 281 enum gdb_rc
 282 gdb_list_thread_ids (struct ui_out *uiout, char **error_message)
 283 {
 284   if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
 285                                  error_message, RETURN_MASK_ALL) < 0)
 286     return GDB_RC_FAIL;
 287   return GDB_RC_OK;
 288 }
 289
 290 /* Load infrun state for the thread PID.  */
 291
 292 void
 293 load_infrun_state (ptid_t ptid,
 294                    CORE_ADDR *prev_pc,
 295                    int *trap_expected,
 296                    struct breakpoint **step_resume_breakpoint,
 297                    CORE_ADDR *step_range_start,
 298                    CORE_ADDR *step_range_end,
 299                    struct frame_id *step_frame_id,
 300                    int *handling_longjmp,
 301                    int *another_trap,
 302                    int *stepping_through_solib_after_catch,
 303                    bpstat *stepping_through_solib_catchpoints,
 304                    int *current_line,
 305                    struct symtab **current_symtab)
 306 {
 307   struct thread_info *tp;
 308
 309   /* If we can't find the thread, then we're debugging a single threaded
 310      process.  No need to do anything in that case.  */
 311   tp = find_thread_id (pid_to_thread_id (ptid));
 312   if (tp == NULL)
 313     return;
 314
 315   *prev_pc = tp->prev_pc;
 316   *trap_expected = tp->trap_expected;
 317   *step_resume_breakpoint = tp->step_resume_breakpoint;
 318   *step_range_start = tp->step_range_start;
 319   *step_range_end = tp->step_range_end;
 320   *step_frame_id = tp->step_frame_id;
 321   *handling_longjmp = tp->handling_longjmp;
 322   *another_trap = tp->another_trap;
 323   *stepping_through_solib_after_catch =
 324     tp->stepping_through_solib_after_catch;
 325   *stepping_through_solib_catchpoints =
 326     tp->stepping_through_solib_catchpoints;
 327   *current_line = tp->current_line;
 328   *current_symtab = tp->current_symtab;
 329 }
 330
 331 /* Save infrun state for the thread PID.  */
 332
 333 void
 334 save_infrun_state (ptid_t ptid,
 335                    CORE_ADDR prev_pc,
 336                    int trap_expected,
 337                    struct breakpoint *step_resume_breakpoint,
 338                    CORE_ADDR step_range_start,
 339                    CORE_ADDR step_range_end,
 340                    const struct frame_id *step_frame_id,
 341                    int handling_longjmp,
 342                    int another_trap,
 343                    int stepping_through_solib_after_catch,
 344                    bpstat stepping_through_solib_catchpoints,
 345                    int current_line,
 346                    struct symtab *current_symtab)
 347 {
 348   struct thread_info *tp;
 349
 350   /* If we can't find the thread, then we're debugging a single-threaded
 351      process.  Nothing to do in that case.  */
 352   tp = find_thread_id (pid_to_thread_id (ptid));
 353   if (tp == NULL)
 354     return;
 355
 356   tp->prev_pc = prev_pc;
 357   tp->trap_expected = trap_expected;
 358   tp->step_resume_breakpoint = step_resume_breakpoint;
 359   tp->step_range_start = step_range_start;
 360   tp->step_range_end = step_range_end;
 361   tp->step_frame_id = (*step_frame_id);
 362   tp->handling_longjmp = handling_longjmp;
 363   tp->another_trap = another_trap;
 364   tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
 365   tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
 366   tp->current_line = current_line;
 367   tp->current_symtab = current_symtab;
 368 }
 369
 370 /* Return true if TP is an active thread. */
 371 static int
 372 thread_alive (struct thread_info *tp)
 373 {
 374   if (PIDGET (tp->ptid) == -1)
 375     return 0;
 376   if (!target_thread_alive (tp->ptid))
 377     {
 378       tp->ptid = pid_to_ptid (-1);      /* Mark it as dead */
 379       return 0;
 380     }
 381   return 1;
 382 }
 383
 384 static void
 385 prune_threads (void)
 386 {
 387   struct thread_info *tp, *next;
 388
 389   for (tp = thread_list; tp; tp = next)
 390     {
 391       next = tp->next;
 392       if (!thread_alive (tp))
 393         delete_thread (tp->ptid);
 394     }
 395 }
 396
 397 /* Print information about currently known threads
 398
 399  * Note: this has the drawback that it _really_ switches
 400  *       threads, which frees the frame cache.  A no-side
 401  *       effects info-threads command would be nicer.
 402  */
 403
 404 static void
 405 info_threads_command (char *arg, int from_tty)
 406 {
 407   struct thread_info *tp;
 408   ptid_t current_ptid;
 409   struct frame_info *cur_frame;
 410   struct cleanup *old_chain;
 411   struct frame_id saved_frame_id;
 412   char *extra_info;
 413
 414   /* Backup current thread and selected frame.  */
 415   saved_frame_id = get_frame_id (get_selected_frame (NULL));
 416   old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
 417
 418   prune_threads ();
 419   target_find_new_threads ();
 420   current_ptid = inferior_ptid;
 421   for (tp = thread_list; tp; tp = tp->next)
 422     {
 423       if (ptid_equal (tp->ptid, current_ptid))
 424         printf_filtered ("* ");
 425       else
 426         printf_filtered ("  ");
 427
 428       printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid));
 429
 430       extra_info = target_extra_thread_info (tp);
 431       if (extra_info)
 432         printf_filtered (" (%s)", extra_info);
 433       puts_filtered ("  ");
 434       /* That switch put us at the top of the stack (leaf frame).  */
 435       switch_to_thread (tp->ptid);
 436       print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
 437     }
 438
 439   /* Restores the current thread and the frame selected before
 440      the "info threads" command.  */
 441   do_cleanups (old_chain);
 442
 443   /*  If case we were not able to find the original frame, print the
 444       new selected frame.  */
 445   if (frame_find_by_id (saved_frame_id) == NULL)
 446     {
 447       warning (_("Couldn't restore frame in current thread, at frame 0"));
 448       print_stack_frame (get_selected_frame (NULL), 0, LOCATION);
 449     }
 450 }
 451
 452 /* Switch from one thread to another. */
 453
 454 void
 455 switch_to_thread (ptid_t ptid)
 456 {
 457   if (ptid_equal (ptid, inferior_ptid))
 458     return;
 459
 460   inferior_ptid = ptid;
 461   reinit_frame_cache ();
 462   registers_changed ();
 463   stop_pc = read_pc ();
 464 }
 465
 466 static void
 467 restore_current_thread (ptid_t ptid)
 468 {
 469   if (!ptid_equal (ptid, inferior_ptid))
 470     {
 471       switch_to_thread (ptid);
 472     }
 473 }
 474
 475 static void
 476 restore_selected_frame (struct frame_id a_frame_id)
 477 {
 478   struct frame_info *selected_frame_info = NULL;
 479
 480   if (frame_id_eq (a_frame_id, null_frame_id))
 481     return;
 482
 483   if ((selected_frame_info = frame_find_by_id (a_frame_id)) != NULL)
 484     {
 485       select_frame (selected_frame_info);
 486     }
 487 }
 488
 489 struct current_thread_cleanup
 490 {
 491   ptid_t inferior_ptid;
 492   struct frame_id selected_frame_id;
 493 };
 494
 495 static void
 496 do_restore_current_thread_cleanup (void *arg)
 497 {
 498   struct current_thread_cleanup *old = arg;
 499   restore_current_thread (old->inferior_ptid);
 500   restore_selected_frame (old->selected_frame_id);
 501   xfree (old);
 502 }
 503
 504 static struct cleanup *
 505 make_cleanup_restore_current_thread (ptid_t inferior_ptid,
 506                                      struct frame_id a_frame_id)
 507 {
 508   struct current_thread_cleanup *old
 509     = xmalloc (sizeof (struct current_thread_cleanup));
 510   old->inferior_ptid = inferior_ptid;
 511   old->selected_frame_id = a_frame_id;
 512   return make_cleanup (do_restore_current_thread_cleanup, old);
 513 }
 514
 515 /* Apply a GDB command to a list of threads.  List syntax is a whitespace
 516    seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
 517    of two numbers seperated by a hyphen.  Examples:
 518
 519    thread apply 1 2 7 4 backtrace       Apply backtrace cmd to threads 1,2,7,4
 520    thread apply 2-7 9 p foo(1)  Apply p foo(1) cmd to threads 2->7 & 9
 521    thread apply all p x/i $pc   Apply x/i $pc cmd to all threads
 522  */
 523
 524 static void
 525 thread_apply_all_command (char *cmd, int from_tty)
 526 {
 527   struct thread_info *tp;
 528   struct cleanup *old_chain;
 529   struct cleanup *saved_cmd_cleanup_chain;
 530   char *saved_cmd;
 531   struct frame_id saved_frame_id;
 532   ptid_t current_ptid;
 533   int thread_has_changed = 0;
 534
 535   if (cmd == NULL || *cmd == '\000')
 536     error (_("Please specify a command following the thread ID list"));
 537
 538   current_ptid = inferior_ptid;
 539   saved_frame_id = get_frame_id (get_selected_frame (NULL));
 540   old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
 541
 542   /* It is safe to update the thread list now, before
 543      traversing it for "thread apply all".  MVS */
 544   target_find_new_threads ();
 545
 546   /* Save a copy of the command in case it is clobbered by
 547      execute_command */
 548   saved_cmd = xstrdup (cmd);
 549   saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
 550   for (tp = thread_list; tp; tp = tp->next)
 551     if (thread_alive (tp))
 552       {
 553         switch_to_thread (tp->ptid);
 554         printf_filtered (_("\nThread %d (%s):\n"),
 555                          tp->num, target_tid_to_str (inferior_ptid));
 556         execute_command (cmd, from_tty);
 557         strcpy (cmd, saved_cmd);        /* Restore exact command used previously */
 558       }
 559
 560   if (!ptid_equal (current_ptid, inferior_ptid))
 561     thread_has_changed = 1;
 562
 563   do_cleanups (saved_cmd_cleanup_chain);
 564   do_cleanups (old_chain);
 565   /* Print stack frame only if we changed thread.  */
 566   if (thread_has_changed)
 567     print_stack_frame (get_current_frame (), 1, SRC_LINE);
 568
 569 }
 570
 571 static void
 572 thread_apply_command (char *tidlist, int from_tty)
 573 {
 574   char *cmd;
 575   char *p;
 576   struct cleanup *old_chain;
 577   struct cleanup *saved_cmd_cleanup_chain;
 578   char *saved_cmd;
 579   struct frame_id saved_frame_id;
 580   ptid_t current_ptid;
 581   int thread_has_changed = 0;
 582
 583   if (tidlist == NULL || *tidlist == '\000')
 584     error (_("Please specify a thread ID list"));
 585
 586   for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
 587
 588   if (*cmd == '\000')
 589     error (_("Please specify a command following the thread ID list"));
 590
 591   current_ptid = inferior_ptid;
 592   saved_frame_id = get_frame_id (get_selected_frame (NULL));
 593   old_chain = make_cleanup_restore_current_thread (inferior_ptid, saved_frame_id);
 594
 595   /* Save a copy of the command in case it is clobbered by
 596      execute_command */
 597   saved_cmd = xstrdup (cmd);
 598   saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
 599   while (tidlist < cmd)
 600     {
 601       struct thread_info *tp;
 602       int start, end;
 603
 604       start = strtol (tidlist, &p, 10);
 605       if (p == tidlist)
 606         error (_("Error parsing %s"), tidlist);
 607       tidlist = p;
 608
 609       while (*tidlist == ' ' || *tidlist == '\t')
 610         tidlist++;
 611
 612       if (*tidlist == '-')      /* Got a range of IDs? */
 613         {
 614           tidlist++;            /* Skip the - */
 615           end = strtol (tidlist, &p, 10);
 616           if (p == tidlist)
 617             error (_("Error parsing %s"), tidlist);
 618           tidlist = p;
 619
 620           while (*tidlist == ' ' || *tidlist == '\t')
 621             tidlist++;
 622         }
 623       else
 624         end = start;
 625
 626       for (; start <= end; start++)
 627         {
 628           tp = find_thread_id (start);
 629
 630           if (!tp)
 631             warning (_("Unknown thread %d."), start);
 632           else if (!thread_alive (tp))
 633             warning (_("Thread %d has terminated."), start);
 634           else
 635             {
 636               switch_to_thread (tp->ptid);
 637               printf_filtered (_("\nThread %d (%s):\n"), tp->num,
 638                                target_tid_to_str (inferior_ptid));
 639               execute_command (cmd, from_tty);
 640               strcpy (cmd, saved_cmd);  /* Restore exact command used previously */
 641             }
 642         }
 643     }
 644
 645   if (!ptid_equal (current_ptid, inferior_ptid))
 646     thread_has_changed = 1;
 647
 648   do_cleanups (saved_cmd_cleanup_chain);
 649   do_cleanups (old_chain);
 650   /* Print stack frame only if we changed thread.  */
 651   if (thread_has_changed)
 652     print_stack_frame (get_current_frame (), 1, SRC_LINE);
 653 }
 654
 655 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 656    if prefix of arg is `apply'.  */
 657
 658 static void
 659 thread_command (char *tidstr, int from_tty)
 660 {
 661   if (!tidstr)
 662     {
 663       /* Don't generate an error, just say which thread is current. */
 664       if (target_has_stack)
 665         printf_filtered (_("[Current thread is %d (%s)]\n"),
 666                          pid_to_thread_id (inferior_ptid),
 667                          target_tid_to_str (inferior_ptid));
 668       else
 669         error (_("No stack."));
 670       return;
 671     }
 672
 673   gdb_thread_select (uiout, tidstr, NULL);
 674 }
 675
 676 static int
 677 do_captured_thread_select (struct ui_out *uiout, void *tidstr)
 678 {
 679   int num;
 680   struct thread_info *tp;
 681
 682   num = value_as_long (parse_and_eval (tidstr));
 683
 684   tp = find_thread_id (num);
 685
 686   if (!tp)
 687     error (_("Thread ID %d not known."), num);
 688
 689   if (!thread_alive (tp))
 690     error (_("Thread ID %d has terminated."), num);
 691
 692   switch_to_thread (tp->ptid);
 693
 694   ui_out_text (uiout, "[Switching to thread ");
 695   ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
 696   ui_out_text (uiout, " (");
 697   ui_out_text (uiout, target_tid_to_str (inferior_ptid));
 698   ui_out_text (uiout, ")]");
 699
 700   print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
 701   return GDB_RC_OK;
 702 }
 703
 704 enum gdb_rc
 705 gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
 706 {
 707   if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
 708                                  error_message, RETURN_MASK_ALL) < 0)
 709     return GDB_RC_FAIL;
 710   return GDB_RC_OK;
 711 }
 712
 713 /* Commands with a prefix of `thread'.  */
 714 struct cmd_list_element *thread_cmd_list = NULL;
 715
 716 void
 717 _initialize_thread (void)
 718 {
 719   static struct cmd_list_element *thread_apply_list = NULL;
 720
 721   add_info ("threads", info_threads_command,
 722             _("IDs of currently known threads."));
 723
 724   add_prefix_cmd ("thread", class_run, thread_command, _("\
 725 Use this command to switch between threads.\n\
 726 The new thread ID must be currently known."),
 727                   &thread_cmd_list, "thread ", 1, &cmdlist);
 728
 729   add_prefix_cmd ("apply", class_run, thread_apply_command,
 730                   _("Apply a command to a list of threads."),
 731                   &thread_apply_list, "thread apply ", 1, &thread_cmd_list);
 732
 733   add_cmd ("all", class_run, thread_apply_all_command,
 734            _("Apply a command to all threads."), &thread_apply_list);
 735
 736   if (!xdb_commands)
 737     add_com_alias ("t", "thread", class_run, 1);
 738 }