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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 <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;
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;
for (tp = thread_list; tp; tp = tp->next)
{
if (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();
set_current_frame (create_new_frame (read_fp (), stop_pc));
stop_frame_address = FRAME_FP (get_current_frame ());
select_frame (get_current_frame (), 0);
}
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 ()
{
add_info ("threads", info_threads_command,
"IDs of currently known threads.");
add_com ("thread", class_info, thread_command,
"Use this command to switch between threads.\n\
The new thread ID must be currently known.");
}
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