| 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 | |
| 33 | #include <sys/types.h> |
| 34 | #include <signal.h> |
| 35 | |
| 36 | /*#include "lynxos-core.h"*/ |
| 37 | |
| 38 | struct thread_info |
| 39 | { |
| 40 | struct thread_info *next; |
| 41 | int pid; /* Actual process id */ |
| 42 | int num; /* Convenient handle */ |
| 43 | }; |
| 44 | |
| 45 | static struct thread_info *thread_list = NULL; |
| 46 | static int highest_thread_num; |
| 47 | |
| 48 | static void thread_command PARAMS ((char * tidstr, int from_tty)); |
| 49 | |
| 50 | static void prune_threads PARAMS ((void)); |
| 51 | |
| 52 | static void thread_switch PARAMS ((int pid)); |
| 53 | |
| 54 | void |
| 55 | init_thread_list () |
| 56 | { |
| 57 | struct thread_info *tp, *tpnext; |
| 58 | |
| 59 | if (!thread_list) |
| 60 | return; |
| 61 | |
| 62 | for (tp = thread_list; tp; tp = tpnext) |
| 63 | { |
| 64 | tpnext = tp->next; |
| 65 | free (tp); |
| 66 | } |
| 67 | |
| 68 | thread_list = NULL; |
| 69 | highest_thread_num = 0; |
| 70 | } |
| 71 | |
| 72 | void |
| 73 | add_thread (pid) |
| 74 | int pid; |
| 75 | { |
| 76 | struct thread_info *tp; |
| 77 | |
| 78 | tp = (struct thread_info *) xmalloc (sizeof (struct thread_info)); |
| 79 | |
| 80 | tp->pid = pid; |
| 81 | tp->num = ++highest_thread_num; |
| 82 | tp->next = thread_list; |
| 83 | thread_list = tp; |
| 84 | } |
| 85 | |
| 86 | static struct thread_info * |
| 87 | find_thread_id (num) |
| 88 | int num; |
| 89 | { |
| 90 | struct thread_info *tp; |
| 91 | |
| 92 | for (tp = thread_list; tp; tp = tp->next) |
| 93 | if (tp->num == num) |
| 94 | return tp; |
| 95 | |
| 96 | return NULL; |
| 97 | } |
| 98 | |
| 99 | int |
| 100 | in_thread_list (pid) |
| 101 | int pid; |
| 102 | { |
| 103 | struct thread_info *tp; |
| 104 | |
| 105 | for (tp = thread_list; tp; tp = tp->next) |
| 106 | if (tp->pid == pid) |
| 107 | return 1; |
| 108 | |
| 109 | return 0; /* Never heard of 'im */ |
| 110 | } |
| 111 | |
| 112 | static void |
| 113 | prune_threads () |
| 114 | { |
| 115 | struct thread_info *tp, *tpprev; |
| 116 | |
| 117 | tpprev = 0; |
| 118 | |
| 119 | for (tp = thread_list; tp; tp = tp->next) |
| 120 | if (tp->pid == -1) |
| 121 | { |
| 122 | if (tpprev) |
| 123 | tpprev->next = tp->next; |
| 124 | else |
| 125 | thread_list = NULL; |
| 126 | |
| 127 | free (tp); |
| 128 | } |
| 129 | else |
| 130 | tpprev = tp; |
| 131 | } |
| 132 | |
| 133 | /* Print information about currently known threads */ |
| 134 | |
| 135 | static void |
| 136 | info_threads_command (arg, from_tty) |
| 137 | char *arg; |
| 138 | int from_tty; |
| 139 | { |
| 140 | struct thread_info *tp; |
| 141 | int current_pid = inferior_pid; |
| 142 | |
| 143 | for (tp = thread_list; tp; tp = tp->next) |
| 144 | { |
| 145 | if (target_has_execution |
| 146 | && kill (tp->pid, 0) == -1) |
| 147 | { |
| 148 | tp->pid = -1; /* Mark it as dead */ |
| 149 | continue; |
| 150 | } |
| 151 | |
| 152 | if (tp->pid == current_pid) |
| 153 | printf_filtered ("* "); |
| 154 | else |
| 155 | printf_filtered (" "); |
| 156 | |
| 157 | printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid)); |
| 158 | |
| 159 | thread_switch (tp->pid); |
| 160 | print_stack_frame (selected_frame, -1, 0); |
| 161 | } |
| 162 | |
| 163 | thread_switch (current_pid); |
| 164 | prune_threads (); |
| 165 | } |
| 166 | |
| 167 | /* Switch from one thread to another. */ |
| 168 | |
| 169 | static void |
| 170 | thread_switch (pid) |
| 171 | int pid; |
| 172 | { |
| 173 | if (pid == inferior_pid) |
| 174 | return; |
| 175 | |
| 176 | inferior_pid = pid; |
| 177 | flush_cached_frames (); |
| 178 | registers_changed (); |
| 179 | stop_pc = read_pc(); |
| 180 | set_current_frame (create_new_frame (read_fp (), stop_pc)); |
| 181 | stop_frame_address = FRAME_FP (get_current_frame ()); |
| 182 | select_frame (get_current_frame (), 0); |
| 183 | } |
| 184 | |
| 185 | static void |
| 186 | thread_command (tidstr, from_tty) |
| 187 | char *tidstr; |
| 188 | int from_tty; |
| 189 | { |
| 190 | int num; |
| 191 | struct thread_info *tp; |
| 192 | |
| 193 | if (!tidstr) |
| 194 | error ("Please specify a thread ID. Use the \"info threads\" command to\n\ |
| 195 | see the IDs of currently known threads."); |
| 196 | |
| 197 | |
| 198 | num = atoi (tidstr); |
| 199 | |
| 200 | tp = find_thread_id (num); |
| 201 | |
| 202 | if (!tp) |
| 203 | error ("Thread ID %d not known. Use the \"info threads\" command to\n\ |
| 204 | see the IDs of currently known threads.", num); |
| 205 | |
| 206 | thread_switch (tp->pid); |
| 207 | |
| 208 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid)); |
| 209 | print_stack_frame (selected_frame, selected_frame_level, 1); |
| 210 | } |
| 211 | |
| 212 | void |
| 213 | _initialize_thread () |
| 214 | { |
| 215 | add_info ("threads", info_threads_command, |
| 216 | "IDs of currently known threads."); |
| 217 | add_com ("thread", class_info, thread_command, |
| 218 | "Use this command to switch between threads.\n\ |
| 219 | The new thread ID must be currently known."); |
| 220 | } |