gdb/thread.c

   1 /* Multi-process/thread control for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001
   4    Free Software Foundation, Inc.
   5    Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
   6
   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 2 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, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #include "defs.h"
  26 #include "symtab.h"
  27 #include "frame.h"
  28 #include "inferior.h"
  29 #include "environ.h"
  30 #include "value.h"
  31 #include "target.h"
  32 #include "gdbthread.h"
  33 #include "command.h"
  34 #include "gdbcmd.h"
  35 #include "regcache.h"
  36 #include "gdb.h"
  37
  38 #include <ctype.h>
  39 #include <sys/types.h>
  40 #include <signal.h>
  41 #ifdef UI_OUT
  42 #include "ui-out.h"
  43 #endif
  44
  45 /*#include "lynxos-core.h" */
  46
  47 /* Definition of struct thread_info exported to gdbthread.h */
  48
  49 /* Prototypes for exported functions. */
  50
  51 void _initialize_thread (void);
  52
  53 /* Prototypes for local functions. */
  54
  55 static struct thread_info *thread_list = NULL;
  56 static int highest_thread_num;
  57
  58 static struct thread_info *find_thread_id (int num);
  59
  60 static void thread_command (char *tidstr, int from_tty);
  61 static void thread_apply_all_command (char *, int);
  62 static int thread_alive (struct thread_info *);
  63 static void info_threads_command (char *, int);
  64 static void thread_apply_command (char *, int);
  65 static void restore_current_thread (ptid_t);
  66 static void switch_to_thread (ptid_t ptid);
  67 static void prune_threads (void);
  68
  69 void
  70 delete_step_resume_breakpoint (void *arg)
  71 {
  72   struct breakpoint **breakpointp = (struct breakpoint **) arg;
  73   struct thread_info *tp;
  74
  75   if (*breakpointp != NULL)
  76     {
  77       delete_breakpoint (*breakpointp);
  78       for (tp = thread_list; tp; tp = tp->next)
  79         if (tp->step_resume_breakpoint == *breakpointp)
  80           tp->step_resume_breakpoint = NULL;
  81
  82       *breakpointp = NULL;
  83     }
  84 }
  85
  86 static void
  87 free_thread (struct thread_info *tp)
  88 {
  89   /* NOTE: this will take care of any left-over step_resume breakpoints,
  90      but not any user-specified thread-specific breakpoints. */
  91   if (tp->step_resume_breakpoint)
  92     delete_breakpoint (tp->step_resume_breakpoint);
  93
  94   /* FIXME: do I ever need to call the back-end to give it a
  95      chance at this private data before deleting the thread?  */
  96   if (tp->private)
  97     xfree (tp->private);
  98
  99   xfree (tp);
 100 }
 101
 102 void
 103 init_thread_list (void)
 104 {
 105   struct thread_info *tp, *tpnext;
 106
 107   highest_thread_num = 0;
 108   if (!thread_list)
 109     return;
 110
 111   for (tp = thread_list; tp; tp = tpnext)
 112     {
 113       tpnext = tp->next;
 114       free_thread (tp);
 115     }
 116
 117   thread_list = NULL;
 118 }
 119
 120 /* add_thread now returns a pointer to the new thread_info,
 121    so that back_ends can initialize their private data.  */
 122
 123 struct thread_info *
 124 add_thread (ptid_t ptid)
 125 {
 126   struct thread_info *tp;
 127
 128   tp = (struct thread_info *) xmalloc (sizeof (*tp));
 129   memset (tp, 0, sizeof (*tp));
 130   tp->ptid = ptid;
 131   tp->num = ++highest_thread_num;
 132   tp->next = thread_list;
 133   thread_list = tp;
 134   return tp;
 135 }
 136
 137 void
 138 delete_thread (ptid_t ptid)
 139 {
 140   struct thread_info *tp, *tpprev;
 141
 142   tpprev = NULL;
 143
 144   for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
 145     if (ptid_equal (tp->ptid, ptid))
 146       break;
 147
 148   if (!tp)
 149     return;
 150
 151   if (tpprev)
 152     tpprev->next = tp->next;
 153   else
 154     thread_list = tp->next;
 155
 156   free_thread (tp);
 157 }
 158
 159 static struct thread_info *
 160 find_thread_id (int num)
 161 {
 162   struct thread_info *tp;
 163
 164   for (tp = thread_list; tp; tp = tp->next)
 165     if (tp->num == num)
 166       return tp;
 167
 168   return NULL;
 169 }
 170
 171 /* Find a thread_info by matching PTID.  */
 172 struct thread_info *
 173 find_thread_pid (ptid_t ptid)
 174 {
 175   struct thread_info *tp;
 176
 177   for (tp = thread_list; tp; tp = tp->next)
 178     if (ptid_equal (tp->ptid, ptid))
 179       return tp;
 180
 181   return NULL;
 182 }
 183
 184 /*
 185  * Thread iterator function.
 186  *
 187  * Calls a callback function once for each thread, so long as
 188  * the callback function returns false.  If the callback function
 189  * returns true, the iteration will end and the current thread
 190  * will be returned.  This can be useful for implementing a
 191  * search for a thread with arbitrary attributes, or for applying
 192  * some operation to every thread.
 193  *
 194  * FIXME: some of the existing functionality, such as
 195  * "Thread apply all", might be rewritten using this functionality.
 196  */
 197
 198 struct thread_info *
 199 iterate_over_threads (int (*callback) (struct thread_info *, void *),
 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 (int num)
 213 {
 214   struct thread_info *tp;
 215
 216   for (tp = thread_list; tp; tp = tp->next)
 217     if (tp->num == num)
 218       return 1;
 219
 220   return 0;
 221 }
 222
 223 int
 224 pid_to_thread_id (ptid_t ptid)
 225 {
 226   struct thread_info *tp;
 227
 228   for (tp = thread_list; tp; tp = tp->next)
 229     if (ptid_equal (tp->ptid, ptid))
 230       return tp->num;
 231
 232   return 0;
 233 }
 234
 235 ptid_t
 236 thread_id_to_pid (int num)
 237 {
 238   struct thread_info *thread = find_thread_id (num);
 239   if (thread)
 240     return thread->ptid;
 241   else
 242     return pid_to_ptid (-1);
 243 }
 244
 245 int
 246 in_thread_list (ptid_t ptid)
 247 {
 248   struct thread_info *tp;
 249
 250   for (tp = thread_list; tp; tp = tp->next)
 251     if (ptid_equal (tp->ptid, ptid))
 252       return 1;
 253
 254   return 0;                     /* Never heard of 'im */
 255 }
 256 #ifdef UI_OUT
 257 /* Print a list of thread ids currently known, and the total number of
 258    threads. To be used from within catch_errors. */
 259 static int
 260 do_captured_list_thread_ids (struct ui_out *uiout,
 261                              void *arg)
 262 {
 263   struct thread_info *tp;
 264   int num = 0;
 265
 266   ui_out_tuple_begin (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   ui_out_tuple_end (uiout);
 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)
 283 {
 284   return catch_exceptions (uiout, do_captured_list_thread_ids, NULL,
 285                            NULL, RETURN_MASK_ALL);
 286 }
 287 #endif
 288
 289 /* Load infrun state for the thread PID.  */
 290
 291 void
 292 load_infrun_state (ptid_t ptid,
 293                    CORE_ADDR *prev_pc,
 294                    CORE_ADDR *prev_func_start,
 295                    char **prev_func_name,
 296                    int *trap_expected,
 297                    struct breakpoint **step_resume_breakpoint,
 298                    struct breakpoint **through_sigtramp_breakpoint,
 299                    CORE_ADDR *step_range_start,
 300                    CORE_ADDR *step_range_end,
 301                    CORE_ADDR *step_frame_address,
 302                    int *handling_longjmp,
 303                    int *another_trap,
 304                    int *stepping_through_solib_after_catch,
 305                    bpstat *stepping_through_solib_catchpoints,
 306                    int *stepping_through_sigtramp,
 307                    int *current_line,
 308                    struct symtab **current_symtab,
 309                    CORE_ADDR *step_sp)
 310 {
 311   struct thread_info *tp;
 312
 313   /* If we can't find the thread, then we're debugging a single threaded
 314      process.  No need to do anything in that case.  */
 315   tp = find_thread_id (pid_to_thread_id (ptid));
 316   if (tp == NULL)
 317     return;
 318
 319   *prev_pc = tp->prev_pc;
 320   *prev_func_start = tp->prev_func_start;
 321   *prev_func_name = tp->prev_func_name;
 322   *trap_expected = tp->trap_expected;
 323   *step_resume_breakpoint = tp->step_resume_breakpoint;
 324   *through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
 325   *step_range_start = tp->step_range_start;
 326   *step_range_end = tp->step_range_end;
 327   *step_frame_address = tp->step_frame_address;
 328   *handling_longjmp = tp->handling_longjmp;
 329   *another_trap = tp->another_trap;
 330   *stepping_through_solib_after_catch = tp->stepping_through_solib_after_catch;
 331   *stepping_through_solib_catchpoints = tp->stepping_through_solib_catchpoints;
 332   *stepping_through_sigtramp = tp->stepping_through_sigtramp;
 333   *current_line = tp->current_line;
 334   *current_symtab = tp->current_symtab;
 335   *step_sp = tp->step_sp;
 336 }
 337
 338 /* Save infrun state for the thread PID.  */
 339
 340 void
 341 save_infrun_state (ptid_t ptid,
 342                    CORE_ADDR prev_pc,
 343                    CORE_ADDR prev_func_start,
 344                    char *prev_func_name,
 345                    int trap_expected,
 346                    struct breakpoint *step_resume_breakpoint,
 347                    struct breakpoint *through_sigtramp_breakpoint,
 348                    CORE_ADDR step_range_start,
 349                    CORE_ADDR step_range_end,
 350                    CORE_ADDR step_frame_address,
 351                    int handling_longjmp,
 352                    int another_trap,
 353                    int stepping_through_solib_after_catch,
 354                    bpstat stepping_through_solib_catchpoints,
 355                    int stepping_through_sigtramp,
 356                    int current_line,
 357                    struct symtab *current_symtab,
 358                    CORE_ADDR step_sp)
 359 {
 360   struct thread_info *tp;
 361
 362   /* If we can't find the thread, then we're debugging a single-threaded
 363      process.  Nothing to do in that case.  */
 364   tp = find_thread_id (pid_to_thread_id (ptid));
 365   if (tp == NULL)
 366     return;
 367
 368   tp->prev_pc = prev_pc;
 369   tp->prev_func_start = prev_func_start;
 370   tp->prev_func_name = prev_func_name;
 371   tp->trap_expected = trap_expected;
 372   tp->step_resume_breakpoint = step_resume_breakpoint;
 373   tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
 374   tp->step_range_start = step_range_start;
 375   tp->step_range_end = step_range_end;
 376   tp->step_frame_address = step_frame_address;
 377   tp->handling_longjmp = handling_longjmp;
 378   tp->another_trap = another_trap;
 379   tp->stepping_through_solib_after_catch = stepping_through_solib_after_catch;
 380   tp->stepping_through_solib_catchpoints = stepping_through_solib_catchpoints;
 381   tp->stepping_through_sigtramp = stepping_through_sigtramp;
 382   tp->current_line = current_line;
 383   tp->current_symtab = current_symtab;
 384   tp->step_sp = step_sp;
 385 }
 386
 387 /* Return true if TP is an active thread. */
 388 static int
 389 thread_alive (struct thread_info *tp)
 390 {
 391   if (PIDGET (tp->ptid) == -1)
 392     return 0;
 393   if (!target_thread_alive (tp->ptid))
 394     {
 395       tp->ptid = pid_to_ptid (-1);      /* Mark it as dead */
 396       return 0;
 397     }
 398   return 1;
 399 }
 400
 401 static void
 402 prune_threads (void)
 403 {
 404   struct thread_info *tp, *next;
 405
 406   for (tp = thread_list; tp; tp = next)
 407     {
 408       next = tp->next;
 409       if (!thread_alive (tp))
 410         delete_thread (tp->ptid);
 411     }
 412 }
 413
 414 /* Print information about currently known threads
 415
 416  * Note: this has the drawback that it _really_ switches
 417  *       threads, which frees the frame cache.  A no-side
 418  *       effects info-threads command would be nicer.
 419  */
 420
 421 static void
 422 info_threads_command (char *arg, int from_tty)
 423 {
 424   struct thread_info *tp;
 425   ptid_t current_ptid;
 426   struct frame_info *cur_frame;
 427   int saved_frame_level = selected_frame_level;
 428   int counter;
 429   char *extra_info;
 430
 431   /* Avoid coredumps which would happen if we tried to access a NULL
 432      selected_frame.  */
 433   if (!target_has_stack)
 434     error ("No stack.");
 435
 436   prune_threads ();
 437   target_find_new_threads ();
 438   current_ptid = inferior_ptid;
 439   for (tp = thread_list; tp; tp = tp->next)
 440     {
 441       if (ptid_equal (tp->ptid, current_ptid))
 442         printf_filtered ("* ");
 443       else
 444         printf_filtered ("  ");
 445
 446 #ifdef HPUXHPPA
 447       printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->ptid));
 448 #else
 449       printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->ptid));
 450 #endif
 451
 452       extra_info = target_extra_thread_info (tp);
 453       if (extra_info)
 454         printf_filtered (" (%s)", extra_info);
 455       puts_filtered ("  ");
 456
 457       switch_to_thread (tp->ptid);
 458       if (selected_frame)
 459         print_only_stack_frame (selected_frame, -1, 0);
 460       else
 461         printf_filtered ("[No stack.]\n");
 462     }
 463
 464   switch_to_thread (current_ptid);
 465
 466   /* Code below copied from "up_silently_base" in "stack.c".
 467    * It restores the frame set by the user before the "info threads"
 468    * command.  We have finished the info-threads display by switching
 469    * back to the current thread.  That switch has put us at the top
 470    * of the stack (leaf frame).
 471    */
 472   counter = saved_frame_level;
 473   cur_frame = find_relative_frame (selected_frame, &counter);
 474   if (counter != 0)
 475     {
 476       /* Ooops, can't restore, tell user where we are. */
 477       warning ("Couldn't restore frame in current thread, at frame 0");
 478       print_stack_frame (selected_frame, -1, 0);
 479     }
 480   else
 481     {
 482       select_frame (cur_frame, saved_frame_level);
 483     }
 484
 485   /* re-show current frame. */
 486   show_stack_frame (cur_frame);
 487 }
 488
 489 /* Switch from one thread to another. */
 490
 491 static void
 492 switch_to_thread (ptid_t ptid)
 493 {
 494   if (ptid_equal (ptid, inferior_ptid))
 495     return;
 496
 497   inferior_ptid = ptid;
 498   flush_cached_frames ();
 499   registers_changed ();
 500   stop_pc = read_pc ();
 501   select_frame (get_current_frame (), 0);
 502 }
 503
 504 static void
 505 restore_current_thread (ptid_t ptid)
 506 {
 507   if (! ptid_equal (ptid, inferior_ptid))
 508     {
 509       switch_to_thread (ptid);
 510       print_stack_frame (get_current_frame (), 0, -1);
 511     }
 512 }
 513
 514 struct current_thread_cleanup
 515 {
 516   ptid_t inferior_ptid;
 517 };
 518
 519 static void
 520 do_restore_current_thread_cleanup (void *arg)
 521 {
 522   struct current_thread_cleanup *old = arg;
 523   restore_current_thread (old->inferior_ptid);
 524   xfree (old);
 525 }
 526
 527 static struct cleanup *
 528 make_cleanup_restore_current_thread (ptid_t inferior_ptid)
 529 {
 530   struct current_thread_cleanup *old
 531     = xmalloc (sizeof (struct current_thread_cleanup));
 532   old->inferior_ptid = inferior_ptid;
 533   return make_cleanup (do_restore_current_thread_cleanup, old);
 534 }
 535
 536 /* Apply a GDB command to a list of threads.  List syntax is a whitespace
 537    seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
 538    of two numbers seperated by a hyphen.  Examples:
 539
 540    thread apply 1 2 7 4 backtrace       Apply backtrace cmd to threads 1,2,7,4
 541    thread apply 2-7 9 p foo(1)  Apply p foo(1) cmd to threads 2->7 & 9
 542    thread apply all p x/i $pc   Apply x/i $pc cmd to all threads
 543  */
 544
 545 static void
 546 thread_apply_all_command (char *cmd, int from_tty)
 547 {
 548   struct thread_info *tp;
 549   struct cleanup *old_chain;
 550   struct cleanup *saved_cmd_cleanup_chain;
 551   char *saved_cmd;
 552
 553   if (cmd == NULL || *cmd == '\000')
 554     error ("Please specify a command following the thread ID list");
 555
 556   old_chain = make_cleanup_restore_current_thread (inferior_ptid);
 557
 558   /* It is safe to update the thread list now, before
 559      traversing it for "thread apply all".  MVS */
 560   target_find_new_threads ();
 561
 562   /* Save a copy of the command in case it is clobbered by
 563      execute_command */
 564   saved_cmd = xstrdup (cmd);
 565   saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
 566   for (tp = thread_list; tp; tp = tp->next)
 567     if (thread_alive (tp))
 568       {
 569         switch_to_thread (tp->ptid);
 570 #ifdef HPUXHPPA
 571         printf_filtered ("\nThread %d (%s):\n",
 572                          tp->num,
 573                          target_tid_to_str (inferior_ptid));
 574 #else
 575         printf_filtered ("\nThread %d (%s):\n", tp->num,
 576                          target_pid_to_str (inferior_ptid));
 577 #endif
 578         execute_command (cmd, from_tty);
 579         strcpy (cmd, saved_cmd); /* Restore exact command used previously */
 580       }
 581
 582   do_cleanups (saved_cmd_cleanup_chain);
 583   do_cleanups (old_chain);
 584 }
 585
 586 static void
 587 thread_apply_command (char *tidlist, int from_tty)
 588 {
 589   char *cmd;
 590   char *p;
 591   struct cleanup *old_chain;
 592   struct cleanup *saved_cmd_cleanup_chain;
 593   char *saved_cmd;
 594
 595   if (tidlist == NULL || *tidlist == '\000')
 596     error ("Please specify a thread ID list");
 597
 598   for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
 599
 600   if (*cmd == '\000')
 601     error ("Please specify a command following the thread ID list");
 602
 603   old_chain = make_cleanup_restore_current_thread (inferior_ptid);
 604
 605   /* Save a copy of the command in case it is clobbered by
 606      execute_command */
 607   saved_cmd = xstrdup (cmd);
 608   saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
 609   while (tidlist < cmd)
 610     {
 611       struct thread_info *tp;
 612       int start, end;
 613
 614       start = strtol (tidlist, &p, 10);
 615       if (p == tidlist)
 616         error ("Error parsing %s", tidlist);
 617       tidlist = p;
 618
 619       while (*tidlist == ' ' || *tidlist == '\t')
 620         tidlist++;
 621
 622       if (*tidlist == '-')      /* Got a range of IDs? */
 623         {
 624           tidlist++;            /* Skip the - */
 625           end = strtol (tidlist, &p, 10);
 626           if (p == tidlist)
 627             error ("Error parsing %s", tidlist);
 628           tidlist = p;
 629
 630           while (*tidlist == ' ' || *tidlist == '\t')
 631             tidlist++;
 632         }
 633       else
 634         end = start;
 635
 636       for (; start <= end; start++)
 637         {
 638           tp = find_thread_id (start);
 639
 640           if (!tp)
 641             warning ("Unknown thread %d.", start);
 642           else if (!thread_alive (tp))
 643             warning ("Thread %d has terminated.", start);
 644           else
 645             {
 646               switch_to_thread (tp->ptid);
 647 #ifdef HPUXHPPA
 648               printf_filtered ("\nThread %d (%s):\n", tp->num,
 649                                target_tid_to_str (inferior_ptid));
 650 #else
 651               printf_filtered ("\nThread %d (%s):\n", tp->num,
 652                                target_pid_to_str (inferior_ptid));
 653 #endif
 654               execute_command (cmd, from_tty);
 655               strcpy (cmd, saved_cmd);  /* Restore exact command used previously */
 656             }
 657         }
 658     }
 659
 660   do_cleanups (saved_cmd_cleanup_chain);
 661   do_cleanups (old_chain);
 662 }
 663
 664 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 665    if prefix of arg is `apply'.  */
 666
 667 static void
 668 thread_command (char *tidstr, int from_tty)
 669 {
 670   if (!tidstr)
 671     {
 672       /* Don't generate an error, just say which thread is current. */
 673       if (target_has_stack)
 674         printf_filtered ("[Current thread is %d (%s)]\n",
 675                          pid_to_thread_id (inferior_ptid),
 676 #if defined(HPUXHPPA)
 677                          target_tid_to_str (inferior_ptid)
 678 #else
 679                          target_pid_to_str (inferior_ptid)
 680 #endif
 681           );
 682       else
 683         error ("No stack.");
 684       return;
 685     }
 686
 687   gdb_thread_select (uiout, tidstr);
 688 }
 689
 690 static int
 691 do_captured_thread_select (struct ui_out *uiout,
 692                            void *tidstr)
 693 {
 694   int num;
 695   struct thread_info *tp;
 696
 697   num = value_as_long (parse_and_eval (tidstr));
 698
 699   tp = find_thread_id (num);
 700
 701 #ifdef UI_OUT
 702   if (!tp)
 703     error ("Thread ID %d not known.", num);
 704 #else
 705   if (!tp)
 706     error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
 707 see the IDs of currently known threads.", num);
 708 #endif
 709
 710   if (!thread_alive (tp))
 711     error ("Thread ID %d has terminated.\n", num);
 712
 713   switch_to_thread (tp->ptid);
 714
 715 #ifdef UI_OUT
 716   ui_out_text (uiout, "[Switching to thread ");
 717   ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
 718   ui_out_text (uiout, " (");
 719 #if defined(HPUXHPPA)
 720   ui_out_text (uiout, target_tid_to_str (inferior_ptid));
 721 #else
 722   ui_out_text (uiout, target_pid_to_str (inferior_ptid));
 723 #endif
 724   ui_out_text (uiout, ")]");
 725 #else /* UI_OUT */
 726   printf_filtered ("[Switching to thread %d (%s)]\n",
 727                    pid_to_thread_id (inferior_ptid),
 728 #if defined(HPUXHPPA)
 729                    target_tid_to_str (inferior_ptid)
 730 #else
 731                    target_pid_to_str (inferior_ptid)
 732 #endif
 733     );
 734 #endif /* UI_OUT */
 735
 736   print_stack_frame (selected_frame, selected_frame_level, 1);
 737   return GDB_RC_OK;
 738 }
 739
 740 enum gdb_rc
 741 gdb_thread_select (struct ui_out *uiout,
 742                    char *tidstr)
 743 {
 744   return catch_exceptions (uiout, do_captured_thread_select, tidstr,
 745                            NULL, RETURN_MASK_ALL);
 746 }
 747
 748 /* Commands with a prefix of `thread'.  */
 749 struct cmd_list_element *thread_cmd_list = NULL;
 750
 751 void
 752 _initialize_thread (void)
 753 {
 754   static struct cmd_list_element *thread_apply_list = NULL;
 755
 756   add_info ("threads", info_threads_command,
 757             "IDs of currently known threads.");
 758
 759   add_prefix_cmd ("thread", class_run, thread_command,
 760                   "Use this command to switch between threads.\n\
 761 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
 762                   &cmdlist);
 763
 764   add_prefix_cmd ("apply", class_run, thread_apply_command,
 765                   "Apply a command to a list of threads.",
 766                   &thread_apply_list, "apply ", 1, &thread_cmd_list);
 767
 768   add_cmd ("all", class_run, thread_apply_all_command,
 769            "Apply a command to all threads.",
 770            &thread_apply_list);
 771
 772   if (!xdb_commands)
 773     add_com_alias ("t", "thread", class_run, 1);
 774 }