gdb/thread.c

   1 /* Multi-process/thread control for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1988, 1993
   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  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 "thread.h"
  31 #include "command.h"
  32 #include "gdbcmd.h"
  33
  34 #include <ctype.h>
  35 #include <sys/types.h>
  36 #include <signal.h>
  37
  38 /*#include "lynxos-core.h"*/
  39
  40 struct thread_info
  41 {
  42   struct thread_info *next;
  43   int pid;                      /* Actual process id */
  44   int num;                      /* Convenient handle */
  45 };
  46
  47 static struct thread_info *thread_list = NULL;
  48 static int highest_thread_num;
  49
  50 static void thread_command PARAMS ((char * tidstr, int from_tty));
  51
  52 static void prune_threads PARAMS ((void));
  53
  54 static void thread_switch PARAMS ((int pid));
  55
  56 static struct thread_info * find_thread_id PARAMS ((int num));
  57
  58 void
  59 init_thread_list ()
  60 {
  61   struct thread_info *tp, *tpnext;
  62
  63   if (!thread_list)
  64     return;
  65
  66   for (tp = thread_list; tp; tp = tpnext)
  67     {
  68       tpnext = tp->next;
  69       free (tp);
  70     }
  71
  72   thread_list = NULL;
  73   highest_thread_num = 0;
  74 }
  75
  76 void
  77 add_thread (pid)
  78      int pid;
  79 {
  80   struct thread_info *tp;
  81
  82   tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
  83
  84   tp->pid = pid;
  85   tp->num = ++highest_thread_num;
  86   tp->next = thread_list;
  87   thread_list = tp;
  88 }
  89
  90 static struct thread_info *
  91 find_thread_id (num)
  92     int num;
  93 {
  94   struct thread_info *tp;
  95
  96   for (tp = thread_list; tp; tp = tp->next)
  97     if (tp->num == num)
  98       return tp;
  99
 100   return NULL;
 101 }
 102
 103 int
 104 valid_thread_id (num)
 105     int num;
 106 {
 107   struct thread_info *tp;
 108
 109   for (tp = thread_list; tp; tp = tp->next)
 110     if (tp->num == num)
 111       return 1;
 112
 113   return 0;
 114 }
 115
 116 int
 117 pid_to_thread_id (pid)
 118     int pid;
 119 {
 120   struct thread_info *tp;
 121
 122   for (tp = thread_list; tp; tp = tp->next)
 123     if (tp->pid == pid)
 124       return tp->num;
 125
 126   return 0;
 127 }
 128
 129 int
 130 in_thread_list (pid)
 131     int pid;
 132 {
 133   struct thread_info *tp;
 134
 135   for (tp = thread_list; tp; tp = tp->next)
 136     if (tp->pid == pid)
 137       return 1;
 138
 139   return 0;                     /* Never heard of 'im */
 140 }
 141
 142 static void
 143 prune_threads ()
 144 {
 145   struct thread_info *tp, *tpprev;
 146
 147   tpprev = 0;
 148
 149   for (tp = thread_list; tp; tp = tp->next)
 150     if (tp->pid == -1)
 151       {
 152         if (tpprev)
 153           tpprev->next = tp->next;
 154         else
 155           thread_list = NULL;
 156
 157         free (tp);
 158       }
 159     else
 160       tpprev = tp;
 161 }
 162
 163 /* Print information about currently known threads */
 164
 165 static void
 166 info_threads_command (arg, from_tty)
 167      char *arg;
 168      int from_tty;
 169 {
 170   struct thread_info *tp;
 171   int current_pid = inferior_pid;
 172
 173   for (tp = thread_list; tp; tp = tp->next)
 174     {
 175       if (target_has_execution
 176           && kill (tp->pid, 0) == -1)
 177         {
 178           tp->pid = -1; /* Mark it as dead */
 179           continue;
 180         }
 181
 182       if (tp->pid == current_pid)
 183         printf_filtered ("* ");
 184       else
 185         printf_filtered ("  ");
 186
 187       printf_filtered ("%d %s  ", tp->num, target_pid_to_str (tp->pid));
 188
 189       thread_switch (tp->pid);
 190       print_stack_frame (selected_frame, -1, 0);
 191     }
 192
 193   thread_switch (current_pid);
 194   prune_threads ();
 195 }
 196
 197 /* Switch from one thread to another. */
 198
 199 static void
 200 thread_switch (pid)
 201      int pid;
 202 {
 203   if (pid == inferior_pid)
 204     return;
 205
 206   inferior_pid = pid;
 207   flush_cached_frames ();
 208   registers_changed ();
 209   stop_pc = read_pc();
 210   set_current_frame (create_new_frame (read_fp (), stop_pc));
 211   stop_frame_address = FRAME_FP (get_current_frame ());
 212   select_frame (get_current_frame (), 0);
 213 }
 214
 215 static void
 216 restore_current_thread (pid)
 217      int pid;
 218 {
 219   if (pid != inferior_pid)
 220     thread_switch (pid);
 221 }
 222
 223 /* Apply a GDB command to a list of threads.  List syntax is a whitespace
 224    seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
 225    of two numbers seperated by a hyphen.  Examples:
 226
 227         thread apply 1 2 7 4 backtrace  Apply backtrace cmd to threads 1,2,7,4
 228         thread apply 2-7 9 p foo(1)     Apply p foo(1) cmd to threads 2->7 & 9
 229         thread apply all p x/i $pc      Apply x/i $pc cmd to all threads
 230 */
 231
 232 static void
 233 thread_apply_all_command (cmd, from_tty)
 234      char *cmd;
 235      int from_tty;
 236 {
 237   struct thread_info *tp;
 238   struct cleanup *old_chain;
 239
 240   if (cmd == NULL || *cmd == '\000')
 241     error ("Please specify a command following the thread ID list");
 242
 243   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 244
 245   for (tp = thread_list; tp; tp = tp->next)
 246     {
 247       thread_switch (tp->pid);
 248       printf_filtered ("\nThread %d (%s):\n", tp->num,
 249                        target_pid_to_str (inferior_pid));
 250       execute_command (cmd, from_tty);
 251     }
 252 }
 253
 254 static void
 255 thread_apply_command (tidlist, from_tty)
 256      char *tidlist;
 257      int from_tty;
 258 {
 259   char *cmd;
 260   char *p;
 261   struct cleanup *old_chain;
 262
 263   if (tidlist == NULL || *tidlist == '\000')
 264     error ("Please specify a thread ID list");
 265
 266   for (cmd = tidlist; *cmd != '\000' && !isalpha(*cmd); cmd++);
 267
 268   if (*cmd == '\000')
 269     error ("Please specify a command following the thread ID list");
 270
 271   old_chain = make_cleanup (restore_current_thread, inferior_pid);
 272
 273   while (tidlist < cmd)
 274     {
 275       struct thread_info *tp;
 276       int start, end;
 277
 278       start = strtol (tidlist, &p, 10);
 279       if (p == tidlist)
 280         error ("Error parsing %s", tidlist);
 281       tidlist = p;
 282
 283       while (*tidlist == ' ' || *tidlist == '\t')
 284         tidlist++;
 285
 286       if (*tidlist == '-')      /* Got a range of IDs? */
 287         {
 288           tidlist++;    /* Skip the - */
 289           end = strtol (tidlist, &p, 10);
 290           if (p == tidlist)
 291             error ("Error parsing %s", tidlist);
 292           tidlist = p;
 293
 294           while (*tidlist == ' ' || *tidlist == '\t')
 295             tidlist++;
 296         }
 297       else
 298         end = start;
 299
 300       for (; start <= end; start++)
 301         {
 302           tp = find_thread_id (start);
 303
 304           if (!tp)
 305             {
 306               warning ("Unknown thread %d.", start);
 307               continue;
 308             }
 309
 310           thread_switch (tp->pid);
 311           printf_filtered ("\nThread %d (%s):\n", tp->num,
 312                            target_pid_to_str (inferior_pid));
 313           execute_command (cmd, from_tty);
 314         }
 315     }
 316 }
 317
 318 /* Switch to the specified thread.  Will dispatch off to thread_apply_command
 319    if prefix of arg is `apply'.  */
 320
 321 static void
 322 thread_command (tidstr, from_tty)
 323      char *tidstr;
 324      int from_tty;
 325 {
 326   int num;
 327   struct thread_info *tp;
 328
 329   if (!tidstr)
 330     error ("Please specify a thread ID.  Use the \"info threads\" command to\n\
 331 see the IDs of currently known threads.");
 332
 333   num = atoi (tidstr);
 334
 335   tp = find_thread_id (num);
 336
 337   if (!tp)
 338     error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
 339 see the IDs of currently known threads.", num);
 340
 341   thread_switch (tp->pid);
 342
 343   printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
 344   print_stack_frame (selected_frame, selected_frame_level, 1);
 345 }
 346
 347 void
 348 _initialize_thread ()
 349 {
 350   static struct cmd_list_element *thread_cmd_list = NULL;
 351   static struct cmd_list_element *thread_apply_list = NULL;
 352   extern struct cmd_list_element *cmdlist;
 353
 354   add_info ("threads", info_threads_command,
 355             "IDs of currently known threads.");
 356
 357   add_prefix_cmd ("thread", class_run, thread_command,
 358                   "Use this command to switch between threads.\n\
 359 The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
 360                   &cmdlist);
 361
 362   add_prefix_cmd ("apply", class_run, thread_apply_command,
 363                   "Apply a command to a list of threads.",
 364                   &thread_apply_list, "apply ", 1, &thread_cmd_list);
 365
 366   add_cmd ("all", class_run, thread_apply_all_command,
 367            "Apply a command to all threads.",
 368            &thread_apply_list);
 369
 370   add_com_alias ("t", "thread", class_run, 1);
 371 }