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/* Multi-process/thread control for GDB, the GNU debugger.
Copyright 1986, 1987, 1988, 1993
Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
#include "environ.h"
#include "value.h"
#include "target.h"
#include "thread.h"
#include "command.h"
#include "gdbcmd.h"
#include <ctype.h>
#include <sys/types.h>
#include <signal.h>
/*#include "lynxos-core.h"*/
struct thread_info
{
struct thread_info *next;
int pid; /* Actual process id */
int num; /* Convenient handle */
};
static struct thread_info *thread_list = NULL;
static int highest_thread_num;
#ifdef NeXT /* this name conflicts with mach header files */
#define thread_switch Thread_Switch
#endif /* NeXT */
static void thread_command PARAMS ((char * tidstr, int from_tty));
static void prune_threads PARAMS ((void));
static void thread_switch PARAMS ((int pid));
static struct thread_info * find_thread_id PARAMS ((int num));
void
init_thread_list ()
{
struct thread_info *tp, *tpnext;
if (!thread_list)
return;
for (tp = thread_list; tp; tp = tpnext)
{
tpnext = tp->next;
free (tp);
}
thread_list = NULL;
highest_thread_num = 0;
}
void
add_thread (pid)
int pid;
{
struct thread_info *tp;
tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
tp->pid = pid;
tp->num = ++highest_thread_num;
tp->next = thread_list;
thread_list = tp;
}
static struct thread_info *
find_thread_id (num)
int num;
{
struct thread_info *tp;
for (tp = thread_list; tp; tp = tp->next)
if (tp->num == num)
return tp;
return NULL;
}
int
valid_thread_id (num)
int num;
{
struct thread_info *tp;
for (tp = thread_list; tp; tp = tp->next)
if (tp->num == num)
return 1;
return 0;
}
int
pid_to_thread_id (pid)
int pid;
{
struct thread_info *tp;
for (tp = thread_list; tp; tp = tp->next)
if (tp->pid == pid)
return tp->num;
return 0;
}
int
in_thread_list (pid)
int pid;
{
struct thread_info *tp;
for (tp = thread_list; tp; tp = tp->next)
if (tp->pid == pid)
return 1;
return 0; /* Never heard of 'im */
}
static void
prune_threads ()
{
struct thread_info *tp, *tpprev;
tpprev = 0;
for (tp = thread_list; tp; tp = tp->next)
if (tp->pid == -1)
{
if (tpprev)
tpprev->next = tp->next;
else
thread_list = NULL;
free (tp);
}
else
tpprev = tp;
}
/* Print information about currently known threads */
static void
info_threads_command (arg, from_tty)
char *arg;
int from_tty;
{
struct thread_info *tp;
int current_pid = inferior_pid;
/* Avoid coredumps which would happen if we tried to access a NULL
selected_frame. */
if (!target_has_stack) error ("No stack.");
for (tp = thread_list; tp; tp = tp->next)
{
/* FIXME: need to figure out a way to do this for remote too,
or else the print_stack_frame below will fail with a bogus
thread ID. */
if (!STREQ (current_target.to_shortname, "remote")
&& target_has_execution
&& kill (tp->pid, 0) == -1)
{
tp->pid = -1; /* Mark it as dead */
continue;
}
if (tp->pid == current_pid)
printf_filtered ("* ");
else
printf_filtered (" ");
printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
thread_switch (tp->pid);
print_stack_frame (selected_frame, -1, 0);
}
thread_switch (current_pid);
prune_threads ();
}
/* Switch from one thread to another. */
static void
thread_switch (pid)
int pid;
{
if (pid == inferior_pid)
return;
inferior_pid = pid;
flush_cached_frames ();
registers_changed ();
stop_pc = read_pc();
select_frame (get_current_frame (), 0);
}
static void
restore_current_thread (pid)
int pid;
{
if (pid != inferior_pid)
thread_switch (pid);
}
/* Apply a GDB command to a list of threads. List syntax is a whitespace
seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
of two numbers seperated by a hyphen. Examples:
thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
thread apply all p x/i $pc Apply x/i $pc cmd to all threads
*/
static void
thread_apply_all_command (cmd, from_tty)
char *cmd;
int from_tty;
{
struct thread_info *tp;
struct cleanup *old_chain;
if (cmd == NULL || *cmd == '\000')
error ("Please specify a command following the thread ID list");
old_chain = make_cleanup (restore_current_thread, inferior_pid);
for (tp = thread_list; tp; tp = tp->next)
{
thread_switch (tp->pid);
printf_filtered ("\nThread %d (%s):\n", tp->num,
target_pid_to_str (inferior_pid));
execute_command (cmd, from_tty);
}
}
static void
thread_apply_command (tidlist, from_tty)
char *tidlist;
int from_tty;
{
char *cmd;
char *p;
struct cleanup *old_chain;
if (tidlist == NULL || *tidlist == '\000')
error ("Please specify a thread ID list");
for (cmd = tidlist; *cmd != '\000' && !isalpha(*cmd); cmd++);
if (*cmd == '\000')
error ("Please specify a command following the thread ID list");
old_chain = make_cleanup (restore_current_thread, inferior_pid);
while (tidlist < cmd)
{
struct thread_info *tp;
int start, end;
start = strtol (tidlist, &p, 10);
if (p == tidlist)
error ("Error parsing %s", tidlist);
tidlist = p;
while (*tidlist == ' ' || *tidlist == '\t')
tidlist++;
if (*tidlist == '-') /* Got a range of IDs? */
{
tidlist++; /* Skip the - */
end = strtol (tidlist, &p, 10);
if (p == tidlist)
error ("Error parsing %s", tidlist);
tidlist = p;
while (*tidlist == ' ' || *tidlist == '\t')
tidlist++;
}
else
end = start;
for (; start <= end; start++)
{
tp = find_thread_id (start);
if (!tp)
{
warning ("Unknown thread %d.", start);
continue;
}
thread_switch (tp->pid);
printf_filtered ("\nThread %d (%s):\n", tp->num,
target_pid_to_str (inferior_pid));
execute_command (cmd, from_tty);
}
}
}
/* Switch to the specified thread. Will dispatch off to thread_apply_command
if prefix of arg is `apply'. */
static void
thread_command (tidstr, from_tty)
char *tidstr;
int from_tty;
{
int num;
struct thread_info *tp;
if (!tidstr)
error ("Please specify a thread ID. Use the \"info threads\" command to\n\
see the IDs of currently known threads.");
num = atoi (tidstr);
tp = find_thread_id (num);
if (!tp)
error ("Thread ID %d not known. Use the \"info threads\" command to\n\
see the IDs of currently known threads.", num);
thread_switch (tp->pid);
printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
print_stack_frame (selected_frame, selected_frame_level, 1);
}
void
_initialize_thread ()
{
static struct cmd_list_element *thread_cmd_list = NULL;
static struct cmd_list_element *thread_apply_list = NULL;
extern struct cmd_list_element *cmdlist;
add_info ("threads", info_threads_command,
"IDs of currently known threads.");
add_prefix_cmd ("thread", class_run, thread_command,
"Use this command to switch between threads.\n\
The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
&cmdlist);
add_prefix_cmd ("apply", class_run, thread_apply_command,
"Apply a command to a list of threads.",
&thread_apply_list, "apply ", 1, &thread_cmd_list);
add_cmd ("all", class_run, thread_apply_all_command,
"Apply a command to all threads.",
&thread_apply_list);
add_com_alias ("t", "thread", class_run, 1);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.