old-cross-binutils/gdb/thread.c
Michael Snyder 3780c33708 Wed May 21 16:03:25 1997 Michael Snyder <msnyder@cleaver.cygnus.com>
* procfs.c (init_procinfo): new function, abstracts some code
        shared by create_procinfo and do_attach;
        (procfs_set_inferior_syscall_traps): new function, abstracts
        some code needed by procfs_init_inferior, do_attach, and
        procfs_lwp_creation_handler; (procfs_first_available): new
        function, find any LWP that's runnable; (procfs_thread_alive):
        replace stub function with real implementation;
        (procfs_lwp_creation_handler): fix bug starting new child
        threads; (info_proc): bug fixes and enhancements for the
        "INFO PROCESSES" command; (close_procinfo_file): call new
        function "delete_thread" to cleanup GDB's thread database;
        (proc_init_failed): add new argument "kill", to control whether
        process is killed (so this function can be shared by
        create_procinfo and do_attach); (procfs_exit_handler): handle
        exit from an attached process, and cleanup procinfo handles
        when the process exits; (procfs_resume, procfs_wait): cleanup
        after a thread when it exits; (do_attach, do_detach): handle
        attached processes with multiple threads; plus some general
        improvements in the diagnostic output.
        * sol-thread.c (sol_thread_alive): replace stub with real
        implementation; (thread_to_lwp, lwp_to_thread): enhance to
        handle threads that may have exited; (sol_thread_attach): add
        startup setup stuff; (sol_thread_detach): add unpush_target
        call; (sol_thread_mourn_inferior): add unpush_target call;
        (sol_thread_wait, sol_thread_resume): enhance to deal with
        thread exit cleanly; (sol_thread_new_objfile,
        sol_thread_pid_to_str): detect unsuccessful startup and
        don't crash; plus some general cleanup.
        * thread.c (delete_thread): new function, allows targets to
        notify gdb when a thread is no longer valid.
        * infrun.c (wait_for_inferior): don't try to detect a new
        thread on receiving a TARGET_EXITED event.
1997-05-21 23:33:33 +00:00

548 lines
12 KiB
C

/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "symtab.h"
#include "frame.h"
#include "inferior.h"
#include "environ.h"
#include "value.h"
#include "target.h"
#include "gdbthread.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 */
CORE_ADDR prev_pc; /* State from wait_for_inferior */
CORE_ADDR prev_func_start;
char *prev_func_name;
struct breakpoint *step_resume_breakpoint;
struct breakpoint *through_sigtramp_breakpoint;
CORE_ADDR step_range_start;
CORE_ADDR step_range_end;
CORE_ADDR step_frame_address;
int trap_expected;
int handling_longjmp;
int another_trap;
};
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
switch_to_thread PARAMS ((int pid));
static struct thread_info *
find_thread_id PARAMS ((int num));
static void
info_threads_command PARAMS ((char *, int));
static void
restore_current_thread PARAMS ((int));
static void
thread_apply_all_command PARAMS ((char *, int));
static void
thread_apply_command PARAMS ((char *, int));
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->prev_pc = 0;
tp->prev_func_start = 0;
tp->prev_func_name = NULL;
tp->step_range_start = 0;
tp->step_range_end = 0;
tp->step_frame_address =0;
tp->step_resume_breakpoint = 0;
tp->through_sigtramp_breakpoint = 0;
tp->handling_longjmp = 0;
tp->trap_expected = 0;
tp->another_trap = 0;
tp->next = thread_list;
thread_list = tp;
}
void
delete_thread (pid)
int pid;
{
struct thread_info *tp, *tpprev;
tpprev = NULL;
for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
if (tp->pid == pid)
break;
if (!tp)
return;
if (tpprev)
tpprev->next = tp->next;
else
thread_list = tp->next;
free (tp);
return;
}
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
thread_id_to_pid (num)
int num;
{
struct thread_info *thread = find_thread_id (num);
if (thread)
return thread->pid;
else
return -1;
}
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 */
}
/* Load infrun state for the thread PID. */
void load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
trap_expected, step_resume_breakpoint,
through_sigtramp_breakpoint, step_range_start,
step_range_end, step_frame_address,
handling_longjmp, another_trap)
int pid;
CORE_ADDR *prev_pc;
CORE_ADDR *prev_func_start;
char **prev_func_name;
int *trap_expected;
struct breakpoint **step_resume_breakpoint;
struct breakpoint **through_sigtramp_breakpoint;
CORE_ADDR *step_range_start;
CORE_ADDR *step_range_end;
CORE_ADDR *step_frame_address;
int *handling_longjmp;
int *another_trap;
{
struct thread_info *tp;
/* If we can't find the thread, then we're debugging a single threaded
process. No need to do anything in that case. */
tp = find_thread_id (pid_to_thread_id (pid));
if (tp == NULL)
return;
*prev_pc = tp->prev_pc;
*prev_func_start = tp->prev_func_start;
*prev_func_name = tp->prev_func_name;
*step_resume_breakpoint = tp->step_resume_breakpoint;
*step_range_start = tp->step_range_start;
*step_range_end = tp->step_range_end;
*step_frame_address = tp->step_frame_address;
*through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
*handling_longjmp = tp->handling_longjmp;
*trap_expected = tp->trap_expected;
*another_trap = tp->another_trap;
}
/* Save infrun state for the thread PID. */
void save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
trap_expected, step_resume_breakpoint,
through_sigtramp_breakpoint, step_range_start,
step_range_end, step_frame_address,
handling_longjmp, another_trap)
int pid;
CORE_ADDR prev_pc;
CORE_ADDR prev_func_start;
char *prev_func_name;
int trap_expected;
struct breakpoint *step_resume_breakpoint;
struct breakpoint *through_sigtramp_breakpoint;
CORE_ADDR step_range_start;
CORE_ADDR step_range_end;
CORE_ADDR step_frame_address;
int handling_longjmp;
int another_trap;
{
struct thread_info *tp;
/* If we can't find the thread, then we're debugging a single-threaded
process. Nothing to do in that case. */
tp = find_thread_id (pid_to_thread_id (pid));
if (tp == NULL)
return;
tp->prev_pc = prev_pc;
tp->prev_func_start = prev_func_start;
tp->prev_func_name = prev_func_name;
tp->step_resume_breakpoint = step_resume_breakpoint;
tp->step_range_start = step_range_start;
tp->step_range_end = step_range_end;
tp->step_frame_address = step_frame_address;
tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
tp->handling_longjmp = handling_longjmp;
tp->trap_expected = trap_expected;
tp->another_trap = another_trap;
}
/* Return true if TP is an active thread. */
static int
thread_alive (tp)
struct thread_info *tp;
{
if (tp->pid == -1)
return 0;
if (! target_thread_alive (tp->pid))
{
tp->pid = -1; /* Mark it as dead */
return 0;
}
return 1;
}
static void
prune_threads ()
{
struct thread_info *tp, *tpprev, *next;
tpprev = 0;
for (tp = thread_list; tp; tp = next)
{
next = tp->next;
if (!thread_alive (tp))
{
if (tpprev)
tpprev->next = next;
else
thread_list = next;
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.");
prune_threads ();
for (tp = thread_list; tp; tp = tp->next)
{
if (tp->pid == current_pid)
printf_filtered ("* ");
else
printf_filtered (" ");
printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
switch_to_thread (tp->pid);
if (selected_frame)
print_stack_frame (selected_frame, -1, 0);
else
printf_filtered ("[No stack.]\n");
}
switch_to_thread (current_pid);
}
/* Switch from one thread to another. */
static void
switch_to_thread (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)
switch_to_thread (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)
if (thread_alive (tp))
{
switch_to_thread (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);
else if (!thread_alive (tp))
warning ("Thread %d has terminated.", start);
else
{
switch_to_thread (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);
if (!thread_alive (tp))
error ("Thread ID %d has terminated.\n", num);
switch_to_thread (tp->pid);
printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
print_stack_frame (selected_frame, selected_frame_level, 1);
}
/* Commands with a prefix of `thread'. */
struct cmd_list_element *thread_cmd_list = NULL;
void
_initialize_thread ()
{
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);
}