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/* Multi-process/thread control for GDB, the GNU debugger.
/* Multi-process/thread control for GDB, the GNU debugger.
 
 
   Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   Copyright (C) 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010
   2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.
   Free Software Foundation, Inc.
 
 
   Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
   Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   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
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
#include "defs.h"
#include "defs.h"
#include "symtab.h"
#include "symtab.h"
#include "frame.h"
#include "frame.h"
#include "inferior.h"
#include "inferior.h"
#include "environ.h"
#include "environ.h"
#include "value.h"
#include "value.h"
#include "target.h"
#include "target.h"
#include "gdbthread.h"
#include "gdbthread.h"
#include "exceptions.h"
#include "exceptions.h"
#include "command.h"
#include "command.h"
#include "gdbcmd.h"
#include "gdbcmd.h"
#include "regcache.h"
#include "regcache.h"
#include "gdb.h"
#include "gdb.h"
#include "gdb_string.h"
#include "gdb_string.h"
 
 
#include <ctype.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/types.h>
#include <signal.h>
#include <signal.h>
#include "ui-out.h"
#include "ui-out.h"
#include "observer.h"
#include "observer.h"
#include "annotate.h"
#include "annotate.h"
#include "cli/cli-decode.h"
#include "cli/cli-decode.h"
 
 
/* Definition of struct thread_info exported to gdbthread.h */
/* Definition of struct thread_info exported to gdbthread.h */
 
 
/* Prototypes for exported functions. */
/* Prototypes for exported functions. */
 
 
void _initialize_thread (void);
void _initialize_thread (void);
 
 
/* Prototypes for local functions. */
/* Prototypes for local functions. */
 
 
static struct thread_info *thread_list = NULL;
static struct thread_info *thread_list = NULL;
static int highest_thread_num;
static int highest_thread_num;
 
 
static void thread_command (char *tidstr, int from_tty);
static void thread_command (char *tidstr, int from_tty);
static void thread_apply_all_command (char *, int);
static void thread_apply_all_command (char *, int);
static int thread_alive (struct thread_info *);
static int thread_alive (struct thread_info *);
static void info_threads_command (char *, int);
static void info_threads_command (char *, int);
static void thread_apply_command (char *, int);
static void thread_apply_command (char *, int);
static void restore_current_thread (ptid_t);
static void restore_current_thread (ptid_t);
static void prune_threads (void);
static void prune_threads (void);
 
 
/* Frontend view of the thread state.  Possible extensions: stepping,
/* Frontend view of the thread state.  Possible extensions: stepping,
   finishing, until(ling),...  */
   finishing, until(ling),...  */
enum thread_state
enum thread_state
{
{
  THREAD_STOPPED,
  THREAD_STOPPED,
  THREAD_RUNNING,
  THREAD_RUNNING,
  THREAD_EXITED,
  THREAD_EXITED,
};
};
 
 
struct thread_info*
struct thread_info*
inferior_thread (void)
inferior_thread (void)
{
{
  struct thread_info *tp = find_thread_ptid (inferior_ptid);
  struct thread_info *tp = find_thread_ptid (inferior_ptid);
  gdb_assert (tp);
  gdb_assert (tp);
  return tp;
  return tp;
}
}
 
 
void
void
delete_step_resume_breakpoint (struct thread_info *tp)
delete_step_resume_breakpoint (struct thread_info *tp)
{
{
  if (tp && tp->step_resume_breakpoint)
  if (tp && tp->step_resume_breakpoint)
    {
    {
      delete_breakpoint (tp->step_resume_breakpoint);
      delete_breakpoint (tp->step_resume_breakpoint);
      tp->step_resume_breakpoint = NULL;
      tp->step_resume_breakpoint = NULL;
    }
    }
}
}
 
 
static void
static void
clear_thread_inferior_resources (struct thread_info *tp)
clear_thread_inferior_resources (struct thread_info *tp)
{
{
  /* NOTE: this will take care of any left-over step_resume breakpoints,
  /* NOTE: this will take care of any left-over step_resume breakpoints,
     but not any user-specified thread-specific breakpoints.  We can not
     but not any user-specified thread-specific breakpoints.  We can not
     delete the breakpoint straight-off, because the inferior might not
     delete the breakpoint straight-off, because the inferior might not
     be stopped at the moment.  */
     be stopped at the moment.  */
  if (tp->step_resume_breakpoint)
  if (tp->step_resume_breakpoint)
    {
    {
      tp->step_resume_breakpoint->disposition = disp_del_at_next_stop;
      tp->step_resume_breakpoint->disposition = disp_del_at_next_stop;
      tp->step_resume_breakpoint = NULL;
      tp->step_resume_breakpoint = NULL;
    }
    }
 
 
  bpstat_clear (&tp->stop_bpstat);
  bpstat_clear (&tp->stop_bpstat);
 
 
  discard_all_intermediate_continuations_thread (tp);
  discard_all_intermediate_continuations_thread (tp);
  discard_all_continuations_thread (tp);
  discard_all_continuations_thread (tp);
}
}
 
 
static void
static void
free_thread (struct thread_info *tp)
free_thread (struct thread_info *tp)
{
{
  clear_thread_inferior_resources (tp);
  clear_thread_inferior_resources (tp);
 
 
  if (tp->private)
  if (tp->private)
    {
    {
      if (tp->private_dtor)
      if (tp->private_dtor)
        tp->private_dtor (tp->private);
        tp->private_dtor (tp->private);
      else
      else
        xfree (tp->private);
        xfree (tp->private);
    }
    }
 
 
  xfree (tp);
  xfree (tp);
}
}
 
 
void
void
init_thread_list (void)
init_thread_list (void)
{
{
  struct thread_info *tp, *tpnext;
  struct thread_info *tp, *tpnext;
 
 
  highest_thread_num = 0;
  highest_thread_num = 0;
 
 
  if (!thread_list)
  if (!thread_list)
    return;
    return;
 
 
  for (tp = thread_list; tp; tp = tpnext)
  for (tp = thread_list; tp; tp = tpnext)
    {
    {
      tpnext = tp->next;
      tpnext = tp->next;
      free_thread (tp);
      free_thread (tp);
    }
    }
 
 
  thread_list = NULL;
  thread_list = NULL;
}
}
 
 
/* Allocate a new thread with target id PTID and add it to the thread
/* Allocate a new thread with target id PTID and add it to the thread
   list.  */
   list.  */
 
 
static struct thread_info *
static struct thread_info *
new_thread (ptid_t ptid)
new_thread (ptid_t ptid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  tp = xcalloc (1, sizeof (*tp));
  tp = xcalloc (1, sizeof (*tp));
 
 
  tp->ptid = ptid;
  tp->ptid = ptid;
  tp->num = ++highest_thread_num;
  tp->num = ++highest_thread_num;
  tp->next = thread_list;
  tp->next = thread_list;
  thread_list = tp;
  thread_list = tp;
 
 
  /* Nothing to follow yet.  */
  /* Nothing to follow yet.  */
  tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
  tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
  tp->state_ = THREAD_STOPPED;
  tp->state_ = THREAD_STOPPED;
 
 
  return tp;
  return tp;
}
}
 
 
struct thread_info *
struct thread_info *
add_thread_silent (ptid_t ptid)
add_thread_silent (ptid_t ptid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  tp = find_thread_ptid (ptid);
  tp = find_thread_ptid (ptid);
  if (tp)
  if (tp)
    /* Found an old thread with the same id.  It has to be dead,
    /* Found an old thread with the same id.  It has to be dead,
       otherwise we wouldn't be adding a new thread with the same id.
       otherwise we wouldn't be adding a new thread with the same id.
       The OS is reusing this id --- delete it, and recreate a new
       The OS is reusing this id --- delete it, and recreate a new
       one.  */
       one.  */
    {
    {
      /* In addition to deleting the thread, if this is the current
      /* In addition to deleting the thread, if this is the current
         thread, then we need to take care that delete_thread doesn't
         thread, then we need to take care that delete_thread doesn't
         really delete the thread if it is inferior_ptid.  Create a
         really delete the thread if it is inferior_ptid.  Create a
         new template thread in the list with an invalid ptid, switch
         new template thread in the list with an invalid ptid, switch
         to it, delete the original thread, reset the new thread's
         to it, delete the original thread, reset the new thread's
         ptid, and switch to it.  */
         ptid, and switch to it.  */
 
 
      if (ptid_equal (inferior_ptid, ptid))
      if (ptid_equal (inferior_ptid, ptid))
        {
        {
          tp = new_thread (ptid);
          tp = new_thread (ptid);
 
 
          /* Make switch_to_thread not read from the thread.  */
          /* Make switch_to_thread not read from the thread.  */
          tp->state_ = THREAD_EXITED;
          tp->state_ = THREAD_EXITED;
          switch_to_thread (minus_one_ptid);
          switch_to_thread (minus_one_ptid);
 
 
          /* Now we can delete it.  */
          /* Now we can delete it.  */
          delete_thread (ptid);
          delete_thread (ptid);
 
 
          /* Now reset its ptid, and reswitch inferior_ptid to it.  */
          /* Now reset its ptid, and reswitch inferior_ptid to it.  */
          tp->ptid = ptid;
          tp->ptid = ptid;
          tp->state_ = THREAD_STOPPED;
          tp->state_ = THREAD_STOPPED;
          switch_to_thread (ptid);
          switch_to_thread (ptid);
 
 
          observer_notify_new_thread (tp);
          observer_notify_new_thread (tp);
 
 
          /* All done.  */
          /* All done.  */
          return tp;
          return tp;
        }
        }
      else
      else
        /* Just go ahead and delete it.  */
        /* Just go ahead and delete it.  */
        delete_thread (ptid);
        delete_thread (ptid);
    }
    }
 
 
  tp = new_thread (ptid);
  tp = new_thread (ptid);
  observer_notify_new_thread (tp);
  observer_notify_new_thread (tp);
 
 
  return tp;
  return tp;
}
}
 
 
struct thread_info *
struct thread_info *
add_thread_with_info (ptid_t ptid, struct private_thread_info *private)
add_thread_with_info (ptid_t ptid, struct private_thread_info *private)
{
{
  struct thread_info *result = add_thread_silent (ptid);
  struct thread_info *result = add_thread_silent (ptid);
 
 
  result->private = private;
  result->private = private;
 
 
  if (print_thread_events)
  if (print_thread_events)
    printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
    printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
 
 
  annotate_new_thread ();
  annotate_new_thread ();
  return result;
  return result;
}
}
 
 
struct thread_info *
struct thread_info *
add_thread (ptid_t ptid)
add_thread (ptid_t ptid)
{
{
  return add_thread_with_info (ptid, NULL);
  return add_thread_with_info (ptid, NULL);
}
}
 
 
/* Delete thread PTID.  If SILENT, don't notify the observer of this
/* Delete thread PTID.  If SILENT, don't notify the observer of this
   exit.  */
   exit.  */
static void
static void
delete_thread_1 (ptid_t ptid, int silent)
delete_thread_1 (ptid_t ptid, int silent)
{
{
  struct thread_info *tp, *tpprev;
  struct thread_info *tp, *tpprev;
 
 
  tpprev = NULL;
  tpprev = NULL;
 
 
  for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
  for (tp = thread_list; tp; tpprev = tp, tp = tp->next)
    if (ptid_equal (tp->ptid, ptid))
    if (ptid_equal (tp->ptid, ptid))
      break;
      break;
 
 
  if (!tp)
  if (!tp)
    return;
    return;
 
 
  /* If this is the current thread, or there's code out there that
  /* If this is the current thread, or there's code out there that
     relies on it existing (refcount > 0) we can't delete yet.  Mark
     relies on it existing (refcount > 0) we can't delete yet.  Mark
     it as exited, and notify it.  */
     it as exited, and notify it.  */
  if (tp->refcount > 0
  if (tp->refcount > 0
      || ptid_equal (tp->ptid, inferior_ptid))
      || ptid_equal (tp->ptid, inferior_ptid))
    {
    {
      if (tp->state_ != THREAD_EXITED)
      if (tp->state_ != THREAD_EXITED)
        {
        {
          observer_notify_thread_exit (tp, silent);
          observer_notify_thread_exit (tp, silent);
 
 
          /* Tag it as exited.  */
          /* Tag it as exited.  */
          tp->state_ = THREAD_EXITED;
          tp->state_ = THREAD_EXITED;
 
 
          /* Clear breakpoints, etc. associated with this thread.  */
          /* Clear breakpoints, etc. associated with this thread.  */
          clear_thread_inferior_resources (tp);
          clear_thread_inferior_resources (tp);
        }
        }
 
 
       /* Will be really deleted some other time.  */
       /* Will be really deleted some other time.  */
       return;
       return;
     }
     }
 
 
  if (tpprev)
  if (tpprev)
    tpprev->next = tp->next;
    tpprev->next = tp->next;
  else
  else
    thread_list = tp->next;
    thread_list = tp->next;
 
 
  /* Notify thread exit, but only if we haven't already.  */
  /* Notify thread exit, but only if we haven't already.  */
  if (tp->state_ != THREAD_EXITED)
  if (tp->state_ != THREAD_EXITED)
    observer_notify_thread_exit (tp, silent);
    observer_notify_thread_exit (tp, silent);
 
 
  free_thread (tp);
  free_thread (tp);
}
}
 
 
/* Delete thread PTID and notify of thread exit.  If this is
/* Delete thread PTID and notify of thread exit.  If this is
   inferior_ptid, don't actually delete it, but tag it as exited and
   inferior_ptid, don't actually delete it, but tag it as exited and
   do the notification.  If PTID is the user selected thread, clear
   do the notification.  If PTID is the user selected thread, clear
   it.  */
   it.  */
void
void
delete_thread (ptid_t ptid)
delete_thread (ptid_t ptid)
{
{
  delete_thread_1 (ptid, 0 /* not silent */);
  delete_thread_1 (ptid, 0 /* not silent */);
}
}
 
 
void
void
delete_thread_silent (ptid_t ptid)
delete_thread_silent (ptid_t ptid)
{
{
  delete_thread_1 (ptid, 1 /* silent */);
  delete_thread_1 (ptid, 1 /* silent */);
}
}
 
 
struct thread_info *
struct thread_info *
find_thread_id (int num)
find_thread_id (int num)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (tp->num == num)
    if (tp->num == num)
      return tp;
      return tp;
 
 
  return NULL;
  return NULL;
}
}
 
 
/* Find a thread_info by matching PTID.  */
/* Find a thread_info by matching PTID.  */
struct thread_info *
struct thread_info *
find_thread_ptid (ptid_t ptid)
find_thread_ptid (ptid_t ptid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (ptid_equal (tp->ptid, ptid))
    if (ptid_equal (tp->ptid, ptid))
      return tp;
      return tp;
 
 
  return NULL;
  return NULL;
}
}
 
 
/*
/*
 * Thread iterator function.
 * Thread iterator function.
 *
 *
 * Calls a callback function once for each thread, so long as
 * Calls a callback function once for each thread, so long as
 * the callback function returns false.  If the callback function
 * the callback function returns false.  If the callback function
 * returns true, the iteration will end and the current thread
 * returns true, the iteration will end and the current thread
 * will be returned.  This can be useful for implementing a
 * will be returned.  This can be useful for implementing a
 * search for a thread with arbitrary attributes, or for applying
 * search for a thread with arbitrary attributes, or for applying
 * some operation to every thread.
 * some operation to every thread.
 *
 *
 * FIXME: some of the existing functionality, such as
 * FIXME: some of the existing functionality, such as
 * "Thread apply all", might be rewritten using this functionality.
 * "Thread apply all", might be rewritten using this functionality.
 */
 */
 
 
struct thread_info *
struct thread_info *
iterate_over_threads (int (*callback) (struct thread_info *, void *),
iterate_over_threads (int (*callback) (struct thread_info *, void *),
                      void *data)
                      void *data)
{
{
  struct thread_info *tp, *next;
  struct thread_info *tp, *next;
 
 
  for (tp = thread_list; tp; tp = next)
  for (tp = thread_list; tp; tp = next)
    {
    {
      next = tp->next;
      next = tp->next;
      if ((*callback) (tp, data))
      if ((*callback) (tp, data))
        return tp;
        return tp;
    }
    }
 
 
  return NULL;
  return NULL;
}
}
 
 
int
int
thread_count (void)
thread_count (void)
{
{
  int result = 0;
  int result = 0;
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    ++result;
    ++result;
 
 
  return result;
  return result;
}
}
 
 
int
int
valid_thread_id (int num)
valid_thread_id (int num)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (tp->num == num)
    if (tp->num == num)
      return 1;
      return 1;
 
 
  return 0;
  return 0;
}
}
 
 
int
int
pid_to_thread_id (ptid_t ptid)
pid_to_thread_id (ptid_t ptid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (ptid_equal (tp->ptid, ptid))
    if (ptid_equal (tp->ptid, ptid))
      return tp->num;
      return tp->num;
 
 
  return 0;
  return 0;
}
}
 
 
ptid_t
ptid_t
thread_id_to_pid (int num)
thread_id_to_pid (int num)
{
{
  struct thread_info *thread = find_thread_id (num);
  struct thread_info *thread = find_thread_id (num);
  if (thread)
  if (thread)
    return thread->ptid;
    return thread->ptid;
  else
  else
    return pid_to_ptid (-1);
    return pid_to_ptid (-1);
}
}
 
 
int
int
in_thread_list (ptid_t ptid)
in_thread_list (ptid_t ptid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (ptid_equal (tp->ptid, ptid))
    if (ptid_equal (tp->ptid, ptid))
      return 1;
      return 1;
 
 
  return 0;                      /* Never heard of 'im */
  return 0;                      /* Never heard of 'im */
}
}
 
 
/* Finds the first thread of the inferior given by PID.  If PID is -1,
/* Finds the first thread of the inferior given by PID.  If PID is -1,
   return the first thread in the list.  */
   return the first thread in the list.  */
 
 
struct thread_info *
struct thread_info *
first_thread_of_process (int pid)
first_thread_of_process (int pid)
{
{
  struct thread_info *tp, *ret = NULL;
  struct thread_info *tp, *ret = NULL;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (pid == -1 || ptid_get_pid (tp->ptid) == pid)
    if (pid == -1 || ptid_get_pid (tp->ptid) == pid)
      if (ret == NULL || tp->num < ret->num)
      if (ret == NULL || tp->num < ret->num)
        ret = tp;
        ret = tp;
 
 
  return ret;
  return ret;
}
}
 
 
struct thread_info *
struct thread_info *
any_thread_of_process (int pid)
any_thread_of_process (int pid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (ptid_get_pid (tp->ptid) == pid)
    if (ptid_get_pid (tp->ptid) == pid)
      return tp;
      return tp;
 
 
  return NULL;
  return NULL;
}
}
 
 
struct thread_info *
struct thread_info *
any_live_thread_of_process (int pid)
any_live_thread_of_process (int pid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  struct thread_info *tp_running = NULL;
  struct thread_info *tp_running = NULL;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (ptid_get_pid (tp->ptid) == pid)
    if (ptid_get_pid (tp->ptid) == pid)
      {
      {
        if (tp->state_ == THREAD_STOPPED)
        if (tp->state_ == THREAD_STOPPED)
          return tp;
          return tp;
        else if (tp->state_ == THREAD_RUNNING)
        else if (tp->state_ == THREAD_RUNNING)
          tp_running = tp;
          tp_running = tp;
      }
      }
 
 
  return tp_running;
  return tp_running;
}
}
 
 
/* Print a list of thread ids currently known, and the total number of
/* Print a list of thread ids currently known, and the total number of
   threads. To be used from within catch_errors. */
   threads. To be used from within catch_errors. */
static int
static int
do_captured_list_thread_ids (struct ui_out *uiout, void *arg)
do_captured_list_thread_ids (struct ui_out *uiout, void *arg)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  int num = 0;
  int num = 0;
  struct cleanup *cleanup_chain;
  struct cleanup *cleanup_chain;
  int current_thread = -1;
  int current_thread = -1;
 
 
  update_thread_list ();
  update_thread_list ();
 
 
  cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");
  cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "thread-ids");
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    {
    {
      if (tp->state_ == THREAD_EXITED)
      if (tp->state_ == THREAD_EXITED)
        continue;
        continue;
 
 
      if (ptid_equal (tp->ptid, inferior_ptid))
      if (ptid_equal (tp->ptid, inferior_ptid))
        current_thread = tp->num;
        current_thread = tp->num;
 
 
      num++;
      num++;
      ui_out_field_int (uiout, "thread-id", tp->num);
      ui_out_field_int (uiout, "thread-id", tp->num);
    }
    }
 
 
  do_cleanups (cleanup_chain);
  do_cleanups (cleanup_chain);
 
 
  if (current_thread != -1)
  if (current_thread != -1)
    ui_out_field_int (uiout, "current-thread-id", current_thread);
    ui_out_field_int (uiout, "current-thread-id", current_thread);
  ui_out_field_int (uiout, "number-of-threads", num);
  ui_out_field_int (uiout, "number-of-threads", num);
  return GDB_RC_OK;
  return GDB_RC_OK;
}
}
 
 
/* Official gdblib interface function to get a list of thread ids and
/* Official gdblib interface function to get a list of thread ids and
   the total number. */
   the total number. */
enum gdb_rc
enum gdb_rc
gdb_list_thread_ids (struct ui_out *uiout, char **error_message)
gdb_list_thread_ids (struct ui_out *uiout, char **error_message)
{
{
  if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
  if (catch_exceptions_with_msg (uiout, do_captured_list_thread_ids, NULL,
                                 error_message, RETURN_MASK_ALL) < 0)
                                 error_message, RETURN_MASK_ALL) < 0)
    return GDB_RC_FAIL;
    return GDB_RC_FAIL;
  return GDB_RC_OK;
  return GDB_RC_OK;
}
}
 
 
/* Return true if TP is an active thread. */
/* Return true if TP is an active thread. */
static int
static int
thread_alive (struct thread_info *tp)
thread_alive (struct thread_info *tp)
{
{
  if (tp->state_ == THREAD_EXITED)
  if (tp->state_ == THREAD_EXITED)
    return 0;
    return 0;
  if (!target_thread_alive (tp->ptid))
  if (!target_thread_alive (tp->ptid))
    return 0;
    return 0;
  return 1;
  return 1;
}
}
 
 
static void
static void
prune_threads (void)
prune_threads (void)
{
{
  struct thread_info *tp, *next;
  struct thread_info *tp, *next;
 
 
  for (tp = thread_list; tp; tp = next)
  for (tp = thread_list; tp; tp = next)
    {
    {
      next = tp->next;
      next = tp->next;
      if (!thread_alive (tp))
      if (!thread_alive (tp))
        delete_thread (tp->ptid);
        delete_thread (tp->ptid);
    }
    }
}
}
 
 
void
void
thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid)
thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid)
{
{
  struct inferior *inf;
  struct inferior *inf;
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  /* It can happen that what we knew as the target inferior id
  /* It can happen that what we knew as the target inferior id
     changes.  E.g, target remote may only discover the remote process
     changes.  E.g, target remote may only discover the remote process
     pid after adding the inferior to GDB's list.  */
     pid after adding the inferior to GDB's list.  */
  inf = find_inferior_pid (ptid_get_pid (old_ptid));
  inf = find_inferior_pid (ptid_get_pid (old_ptid));
  inf->pid = ptid_get_pid (new_ptid);
  inf->pid = ptid_get_pid (new_ptid);
 
 
  tp = find_thread_ptid (old_ptid);
  tp = find_thread_ptid (old_ptid);
  tp->ptid = new_ptid;
  tp->ptid = new_ptid;
 
 
  observer_notify_thread_ptid_changed (old_ptid, new_ptid);
  observer_notify_thread_ptid_changed (old_ptid, new_ptid);
}
}
 
 
void
void
set_running (ptid_t ptid, int running)
set_running (ptid_t ptid, int running)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  int all = ptid_equal (ptid, minus_one_ptid);
  int all = ptid_equal (ptid, minus_one_ptid);
 
 
  /* We try not to notify the observer if no thread has actually changed
  /* We try not to notify the observer if no thread has actually changed
     the running state -- merely to reduce the number of messages to
     the running state -- merely to reduce the number of messages to
     frontend.  Frontend is supposed to handle multiple *running just fine.  */
     frontend.  Frontend is supposed to handle multiple *running just fine.  */
  if (all || ptid_is_pid (ptid))
  if (all || ptid_is_pid (ptid))
    {
    {
      int any_started = 0;
      int any_started = 0;
      for (tp = thread_list; tp; tp = tp->next)
      for (tp = thread_list; tp; tp = tp->next)
        if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
        if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
          {
          {
            if (tp->state_ == THREAD_EXITED)
            if (tp->state_ == THREAD_EXITED)
              continue;
              continue;
            if (running && tp->state_ == THREAD_STOPPED)
            if (running && tp->state_ == THREAD_STOPPED)
              any_started = 1;
              any_started = 1;
            tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
            tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
          }
          }
      if (any_started)
      if (any_started)
        observer_notify_target_resumed (ptid);
        observer_notify_target_resumed (ptid);
    }
    }
  else
  else
    {
    {
      int started = 0;
      int started = 0;
      tp = find_thread_ptid (ptid);
      tp = find_thread_ptid (ptid);
      gdb_assert (tp);
      gdb_assert (tp);
      gdb_assert (tp->state_ != THREAD_EXITED);
      gdb_assert (tp->state_ != THREAD_EXITED);
      if (running && tp->state_ == THREAD_STOPPED)
      if (running && tp->state_ == THREAD_STOPPED)
        started = 1;
        started = 1;
      tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
      tp->state_ = running ? THREAD_RUNNING : THREAD_STOPPED;
      if (started)
      if (started)
        observer_notify_target_resumed (ptid);
        observer_notify_target_resumed (ptid);
    }
    }
}
}
 
 
static int
static int
is_thread_state (ptid_t ptid, enum thread_state state)
is_thread_state (ptid_t ptid, enum thread_state state)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  tp = find_thread_ptid (ptid);
  tp = find_thread_ptid (ptid);
  gdb_assert (tp);
  gdb_assert (tp);
  return tp->state_ == state;
  return tp->state_ == state;
}
}
 
 
int
int
is_stopped (ptid_t ptid)
is_stopped (ptid_t ptid)
{
{
  return is_thread_state (ptid, THREAD_STOPPED);
  return is_thread_state (ptid, THREAD_STOPPED);
}
}
 
 
int
int
is_exited (ptid_t ptid)
is_exited (ptid_t ptid)
{
{
  return is_thread_state (ptid, THREAD_EXITED);
  return is_thread_state (ptid, THREAD_EXITED);
}
}
 
 
int
int
is_running (ptid_t ptid)
is_running (ptid_t ptid)
{
{
  return is_thread_state (ptid, THREAD_RUNNING);
  return is_thread_state (ptid, THREAD_RUNNING);
}
}
 
 
int
int
any_running (void)
any_running (void)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (tp->state_ == THREAD_RUNNING)
    if (tp->state_ == THREAD_RUNNING)
      return 1;
      return 1;
 
 
  return 0;
  return 0;
}
}
 
 
int
int
is_executing (ptid_t ptid)
is_executing (ptid_t ptid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  tp = find_thread_ptid (ptid);
  tp = find_thread_ptid (ptid);
  gdb_assert (tp);
  gdb_assert (tp);
  return tp->executing_;
  return tp->executing_;
}
}
 
 
void
void
set_executing (ptid_t ptid, int executing)
set_executing (ptid_t ptid, int executing)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  int all = ptid_equal (ptid, minus_one_ptid);
  int all = ptid_equal (ptid, minus_one_ptid);
 
 
  if (all || ptid_is_pid (ptid))
  if (all || ptid_is_pid (ptid))
    {
    {
      for (tp = thread_list; tp; tp = tp->next)
      for (tp = thread_list; tp; tp = tp->next)
        if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
        if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
          tp->executing_ = executing;
          tp->executing_ = executing;
    }
    }
  else
  else
    {
    {
      tp = find_thread_ptid (ptid);
      tp = find_thread_ptid (ptid);
      gdb_assert (tp);
      gdb_assert (tp);
      tp->executing_ = executing;
      tp->executing_ = executing;
    }
    }
}
}
 
 
void
void
set_stop_requested (ptid_t ptid, int stop)
set_stop_requested (ptid_t ptid, int stop)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  int all = ptid_equal (ptid, minus_one_ptid);
  int all = ptid_equal (ptid, minus_one_ptid);
 
 
  if (all || ptid_is_pid (ptid))
  if (all || ptid_is_pid (ptid))
    {
    {
      for (tp = thread_list; tp; tp = tp->next)
      for (tp = thread_list; tp; tp = tp->next)
        if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
        if (all || ptid_get_pid (tp->ptid) == ptid_get_pid (ptid))
          tp->stop_requested = stop;
          tp->stop_requested = stop;
    }
    }
  else
  else
    {
    {
      tp = find_thread_ptid (ptid);
      tp = find_thread_ptid (ptid);
      gdb_assert (tp);
      gdb_assert (tp);
      tp->stop_requested = stop;
      tp->stop_requested = stop;
    }
    }
 
 
  /* Call the stop requested observer so other components of GDB can
  /* Call the stop requested observer so other components of GDB can
     react to this request.  */
     react to this request.  */
  if (stop)
  if (stop)
    observer_notify_thread_stop_requested (ptid);
    observer_notify_thread_stop_requested (ptid);
}
}
 
 
void
void
finish_thread_state (ptid_t ptid)
finish_thread_state (ptid_t ptid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  int all;
  int all;
  int any_started = 0;
  int any_started = 0;
 
 
  all = ptid_equal (ptid, minus_one_ptid);
  all = ptid_equal (ptid, minus_one_ptid);
 
 
  if (all || ptid_is_pid (ptid))
  if (all || ptid_is_pid (ptid))
    {
    {
      for (tp = thread_list; tp; tp = tp->next)
      for (tp = thread_list; tp; tp = tp->next)
        {
        {
          if (tp->state_ == THREAD_EXITED)
          if (tp->state_ == THREAD_EXITED)
            continue;
            continue;
          if (all || ptid_get_pid (ptid) == ptid_get_pid (tp->ptid))
          if (all || ptid_get_pid (ptid) == ptid_get_pid (tp->ptid))
            {
            {
              if (tp->executing_ && tp->state_ == THREAD_STOPPED)
              if (tp->executing_ && tp->state_ == THREAD_STOPPED)
                any_started = 1;
                any_started = 1;
              tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
              tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
            }
            }
        }
        }
    }
    }
  else
  else
    {
    {
      tp = find_thread_ptid (ptid);
      tp = find_thread_ptid (ptid);
      gdb_assert (tp);
      gdb_assert (tp);
      if (tp->state_ != THREAD_EXITED)
      if (tp->state_ != THREAD_EXITED)
        {
        {
          if (tp->executing_ && tp->state_ == THREAD_STOPPED)
          if (tp->executing_ && tp->state_ == THREAD_STOPPED)
            any_started = 1;
            any_started = 1;
          tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
          tp->state_ = tp->executing_ ? THREAD_RUNNING : THREAD_STOPPED;
        }
        }
    }
    }
 
 
  if (any_started)
  if (any_started)
    observer_notify_target_resumed (ptid);
    observer_notify_target_resumed (ptid);
}
}
 
 
void
void
finish_thread_state_cleanup (void *arg)
finish_thread_state_cleanup (void *arg)
{
{
  ptid_t *ptid_p = arg;
  ptid_t *ptid_p = arg;
 
 
  gdb_assert (arg);
  gdb_assert (arg);
 
 
  finish_thread_state (*ptid_p);
  finish_thread_state (*ptid_p);
}
}
 
 
/* Prints the list of threads and their details on UIOUT.
/* Prints the list of threads and their details on UIOUT.
   This is a version of 'info_thread_command' suitable for
   This is a version of 'info_thread_command' suitable for
   use from MI.
   use from MI.
   If REQUESTED_THREAD is not -1, it's the GDB id of the thread
   If REQUESTED_THREAD is not -1, it's the GDB id of the thread
   that should be printed.  Otherwise, all threads are
   that should be printed.  Otherwise, all threads are
   printed.
   printed.
   If PID is not -1, only print threads from the process PID.
   If PID is not -1, only print threads from the process PID.
   Otherwise, threads from all attached PIDs are printed.
   Otherwise, threads from all attached PIDs are printed.
   If both REQUESTED_THREAD and PID are not -1, then the thread
   If both REQUESTED_THREAD and PID are not -1, then the thread
   is printed if it belongs to the specified process.  Otherwise,
   is printed if it belongs to the specified process.  Otherwise,
   an error is raised.  */
   an error is raised.  */
void
void
print_thread_info (struct ui_out *uiout, int requested_thread, int pid)
print_thread_info (struct ui_out *uiout, int requested_thread, int pid)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  ptid_t current_ptid;
  ptid_t current_ptid;
  struct cleanup *old_chain;
  struct cleanup *old_chain;
  char *extra_info;
  char *extra_info;
  int current_thread = -1;
  int current_thread = -1;
 
 
  update_thread_list ();
  update_thread_list ();
  current_ptid = inferior_ptid;
  current_ptid = inferior_ptid;
 
 
  /* We'll be switching threads temporarily.  */
  /* We'll be switching threads temporarily.  */
  old_chain = make_cleanup_restore_current_thread ();
  old_chain = make_cleanup_restore_current_thread ();
 
 
  make_cleanup_ui_out_list_begin_end (uiout, "threads");
  make_cleanup_ui_out_list_begin_end (uiout, "threads");
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    {
    {
      struct cleanup *chain2;
      struct cleanup *chain2;
      int core;
      int core;
 
 
      if (requested_thread != -1 && tp->num != requested_thread)
      if (requested_thread != -1 && tp->num != requested_thread)
        continue;
        continue;
 
 
      if (pid != -1 && PIDGET (tp->ptid) != pid)
      if (pid != -1 && PIDGET (tp->ptid) != pid)
        {
        {
          if (requested_thread != -1)
          if (requested_thread != -1)
            error (_("Requested thread not found in requested process"));
            error (_("Requested thread not found in requested process"));
          continue;
          continue;
        }
        }
 
 
      if (ptid_equal (tp->ptid, current_ptid))
      if (ptid_equal (tp->ptid, current_ptid))
        current_thread = tp->num;
        current_thread = tp->num;
 
 
      if (tp->state_ == THREAD_EXITED)
      if (tp->state_ == THREAD_EXITED)
        continue;
        continue;
 
 
      chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
      chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 
 
      if (ptid_equal (tp->ptid, current_ptid))
      if (ptid_equal (tp->ptid, current_ptid))
        ui_out_text (uiout, "* ");
        ui_out_text (uiout, "* ");
      else
      else
        ui_out_text (uiout, "  ");
        ui_out_text (uiout, "  ");
 
 
      ui_out_field_int (uiout, "id", tp->num);
      ui_out_field_int (uiout, "id", tp->num);
      ui_out_text (uiout, " ");
      ui_out_text (uiout, " ");
      ui_out_field_string (uiout, "target-id", target_pid_to_str (tp->ptid));
      ui_out_field_string (uiout, "target-id", target_pid_to_str (tp->ptid));
 
 
      extra_info = target_extra_thread_info (tp);
      extra_info = target_extra_thread_info (tp);
      if (extra_info)
      if (extra_info)
        {
        {
          ui_out_text (uiout, " (");
          ui_out_text (uiout, " (");
          ui_out_field_string (uiout, "details", extra_info);
          ui_out_field_string (uiout, "details", extra_info);
          ui_out_text (uiout, ")");
          ui_out_text (uiout, ")");
        }
        }
      ui_out_text (uiout, "  ");
      ui_out_text (uiout, "  ");
 
 
      if (tp->state_ == THREAD_RUNNING)
      if (tp->state_ == THREAD_RUNNING)
        ui_out_text (uiout, "(running)\n");
        ui_out_text (uiout, "(running)\n");
      else
      else
        {
        {
          /* The switch below puts us at the top of the stack (leaf
          /* The switch below puts us at the top of the stack (leaf
             frame).  */
             frame).  */
          switch_to_thread (tp->ptid);
          switch_to_thread (tp->ptid);
          print_stack_frame (get_selected_frame (NULL),
          print_stack_frame (get_selected_frame (NULL),
                             /* For MI output, print frame level.  */
                             /* For MI output, print frame level.  */
                             ui_out_is_mi_like_p (uiout),
                             ui_out_is_mi_like_p (uiout),
                             LOCATION);
                             LOCATION);
        }
        }
 
 
      if (ui_out_is_mi_like_p (uiout))
      if (ui_out_is_mi_like_p (uiout))
        {
        {
          char *state = "stopped";
          char *state = "stopped";
          if (tp->state_ == THREAD_RUNNING)
          if (tp->state_ == THREAD_RUNNING)
            state = "running";
            state = "running";
          ui_out_field_string (uiout, "state", state);
          ui_out_field_string (uiout, "state", state);
        }
        }
 
 
      core = target_core_of_thread (tp->ptid);
      core = target_core_of_thread (tp->ptid);
      if (ui_out_is_mi_like_p (uiout) && core != -1)
      if (ui_out_is_mi_like_p (uiout) && core != -1)
        ui_out_field_int (uiout, "core", core);
        ui_out_field_int (uiout, "core", core);
 
 
      do_cleanups (chain2);
      do_cleanups (chain2);
    }
    }
 
 
  /* Restores the current thread and the frame selected before
  /* Restores the current thread and the frame selected before
     the "info threads" command.  */
     the "info threads" command.  */
  do_cleanups (old_chain);
  do_cleanups (old_chain);
 
 
  if (pid == -1 && requested_thread == -1)
  if (pid == -1 && requested_thread == -1)
    {
    {
      gdb_assert (current_thread != -1
      gdb_assert (current_thread != -1
                  || !thread_list
                  || !thread_list
                  || ptid_equal (inferior_ptid, null_ptid));
                  || ptid_equal (inferior_ptid, null_ptid));
      if (current_thread != -1 && ui_out_is_mi_like_p (uiout))
      if (current_thread != -1 && ui_out_is_mi_like_p (uiout))
        ui_out_field_int (uiout, "current-thread-id", current_thread);
        ui_out_field_int (uiout, "current-thread-id", current_thread);
 
 
      if (current_thread != -1 && is_exited (current_ptid))
      if (current_thread != -1 && is_exited (current_ptid))
        ui_out_message (uiout, 0, "\n\
        ui_out_message (uiout, 0, "\n\
The current thread <Thread ID %d> has terminated.  See `help thread'.\n",
The current thread <Thread ID %d> has terminated.  See `help thread'.\n",
                        current_thread);
                        current_thread);
      else if (thread_list
      else if (thread_list
               && current_thread == -1
               && current_thread == -1
               && ptid_equal (current_ptid, null_ptid))
               && ptid_equal (current_ptid, null_ptid))
        ui_out_message (uiout, 0, "\n\
        ui_out_message (uiout, 0, "\n\
No selected thread.  See `help thread'.\n");
No selected thread.  See `help thread'.\n");
    }
    }
}
}
 
 
 
 
/* Print information about currently known threads
/* Print information about currently known threads
 
 
 * Note: this has the drawback that it _really_ switches
 * Note: this has the drawback that it _really_ switches
 *       threads, which frees the frame cache.  A no-side
 *       threads, which frees the frame cache.  A no-side
 *       effects info-threads command would be nicer.
 *       effects info-threads command would be nicer.
 */
 */
 
 
static void
static void
info_threads_command (char *arg, int from_tty)
info_threads_command (char *arg, int from_tty)
{
{
  print_thread_info (uiout, -1, -1);
  print_thread_info (uiout, -1, -1);
}
}
 
 
/* Switch from one thread to another. */
/* Switch from one thread to another. */
 
 
void
void
switch_to_thread (ptid_t ptid)
switch_to_thread (ptid_t ptid)
{
{
  /* Switch the program space as well, if we can infer it from the now
  /* Switch the program space as well, if we can infer it from the now
     current thread.  Otherwise, it's up to the caller to select the
     current thread.  Otherwise, it's up to the caller to select the
     space it wants.  */
     space it wants.  */
  if (!ptid_equal (ptid, null_ptid))
  if (!ptid_equal (ptid, null_ptid))
    {
    {
      struct inferior *inf;
      struct inferior *inf;
 
 
      inf = find_inferior_pid (ptid_get_pid (ptid));
      inf = find_inferior_pid (ptid_get_pid (ptid));
      gdb_assert (inf != NULL);
      gdb_assert (inf != NULL);
      set_current_program_space (inf->pspace);
      set_current_program_space (inf->pspace);
      set_current_inferior (inf);
      set_current_inferior (inf);
    }
    }
 
 
  if (ptid_equal (ptid, inferior_ptid))
  if (ptid_equal (ptid, inferior_ptid))
    return;
    return;
 
 
  inferior_ptid = ptid;
  inferior_ptid = ptid;
  reinit_frame_cache ();
  reinit_frame_cache ();
  registers_changed ();
  registers_changed ();
 
 
  /* We don't check for is_stopped, because we're called at times
  /* We don't check for is_stopped, because we're called at times
     while in the TARGET_RUNNING state, e.g., while handling an
     while in the TARGET_RUNNING state, e.g., while handling an
     internal event.  */
     internal event.  */
  if (!ptid_equal (inferior_ptid, null_ptid)
  if (!ptid_equal (inferior_ptid, null_ptid)
      && !is_exited (ptid)
      && !is_exited (ptid)
      && !is_executing (ptid))
      && !is_executing (ptid))
    stop_pc = regcache_read_pc (get_thread_regcache (ptid));
    stop_pc = regcache_read_pc (get_thread_regcache (ptid));
  else
  else
    stop_pc = ~(CORE_ADDR) 0;
    stop_pc = ~(CORE_ADDR) 0;
}
}
 
 
static void
static void
restore_current_thread (ptid_t ptid)
restore_current_thread (ptid_t ptid)
{
{
  switch_to_thread (ptid);
  switch_to_thread (ptid);
}
}
 
 
static void
static void
restore_selected_frame (struct frame_id a_frame_id, int frame_level)
restore_selected_frame (struct frame_id a_frame_id, int frame_level)
{
{
  struct frame_info *frame = NULL;
  struct frame_info *frame = NULL;
  int count;
  int count;
 
 
  gdb_assert (frame_level >= 0);
  gdb_assert (frame_level >= 0);
 
 
  /* Restore by level first, check if the frame id is the same as
  /* Restore by level first, check if the frame id is the same as
     expected.  If that fails, try restoring by frame id.  If that
     expected.  If that fails, try restoring by frame id.  If that
     fails, nothing to do, just warn the user.  */
     fails, nothing to do, just warn the user.  */
 
 
  count = frame_level;
  count = frame_level;
  frame = find_relative_frame (get_current_frame (), &count);
  frame = find_relative_frame (get_current_frame (), &count);
  if (count == 0
  if (count == 0
      && frame != NULL
      && frame != NULL
      /* The frame ids must match - either both valid or both outer_frame_id.
      /* The frame ids must match - either both valid or both outer_frame_id.
         The latter case is not failsafe, but since it's highly unlikely
         The latter case is not failsafe, but since it's highly unlikely
         the search by level finds the wrong frame, it's 99.9(9)% of
         the search by level finds the wrong frame, it's 99.9(9)% of
         the time (for all practical purposes) safe.  */
         the time (for all practical purposes) safe.  */
      && frame_id_eq (get_frame_id (frame), a_frame_id))
      && frame_id_eq (get_frame_id (frame), a_frame_id))
    {
    {
      /* Cool, all is fine.  */
      /* Cool, all is fine.  */
      select_frame (frame);
      select_frame (frame);
      return;
      return;
    }
    }
 
 
  frame = frame_find_by_id (a_frame_id);
  frame = frame_find_by_id (a_frame_id);
  if (frame != NULL)
  if (frame != NULL)
    {
    {
      /* Cool, refound it.  */
      /* Cool, refound it.  */
      select_frame (frame);
      select_frame (frame);
      return;
      return;
    }
    }
 
 
  /* Nothing else to do, the frame layout really changed.  Select the
  /* Nothing else to do, the frame layout really changed.  Select the
     innermost stack frame.  */
     innermost stack frame.  */
  select_frame (get_current_frame ());
  select_frame (get_current_frame ());
 
 
  /* Warn the user.  */
  /* Warn the user.  */
  if (frame_level > 0 && !ui_out_is_mi_like_p (uiout))
  if (frame_level > 0 && !ui_out_is_mi_like_p (uiout))
    {
    {
      warning (_("\
      warning (_("\
Couldn't restore frame #%d in current thread, at reparsed frame #0\n"),
Couldn't restore frame #%d in current thread, at reparsed frame #0\n"),
               frame_level);
               frame_level);
      /* For MI, we should probably have a notification about
      /* For MI, we should probably have a notification about
         current frame change.  But this error is not very
         current frame change.  But this error is not very
         likely, so don't bother for now.  */
         likely, so don't bother for now.  */
      print_stack_frame (get_selected_frame (NULL), 1, SRC_LINE);
      print_stack_frame (get_selected_frame (NULL), 1, SRC_LINE);
    }
    }
}
}
 
 
struct current_thread_cleanup
struct current_thread_cleanup
{
{
  ptid_t inferior_ptid;
  ptid_t inferior_ptid;
  struct frame_id selected_frame_id;
  struct frame_id selected_frame_id;
  int selected_frame_level;
  int selected_frame_level;
  int was_stopped;
  int was_stopped;
  int inf_id;
  int inf_id;
};
};
 
 
static void
static void
do_restore_current_thread_cleanup (void *arg)
do_restore_current_thread_cleanup (void *arg)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  struct current_thread_cleanup *old = arg;
  struct current_thread_cleanup *old = arg;
 
 
  tp = find_thread_ptid (old->inferior_ptid);
  tp = find_thread_ptid (old->inferior_ptid);
 
 
  /* If the previously selected thread belonged to a process that has
  /* If the previously selected thread belonged to a process that has
     in the mean time been deleted (due to normal exit, detach, etc.),
     in the mean time been deleted (due to normal exit, detach, etc.),
     then don't revert back to it, but instead simply drop back to no
     then don't revert back to it, but instead simply drop back to no
     thread selected.  */
     thread selected.  */
  if (tp
  if (tp
      && find_inferior_pid (ptid_get_pid (tp->ptid)) != NULL)
      && find_inferior_pid (ptid_get_pid (tp->ptid)) != NULL)
    restore_current_thread (old->inferior_ptid);
    restore_current_thread (old->inferior_ptid);
  else
  else
    {
    {
      restore_current_thread (null_ptid);
      restore_current_thread (null_ptid);
      set_current_inferior (find_inferior_id (old->inf_id));
      set_current_inferior (find_inferior_id (old->inf_id));
    }
    }
 
 
  /* The running state of the originally selected thread may have
  /* The running state of the originally selected thread may have
     changed, so we have to recheck it here.  */
     changed, so we have to recheck it here.  */
  if (!ptid_equal (inferior_ptid, null_ptid)
  if (!ptid_equal (inferior_ptid, null_ptid)
      && old->was_stopped
      && old->was_stopped
      && is_stopped (inferior_ptid)
      && is_stopped (inferior_ptid)
      && target_has_registers
      && target_has_registers
      && target_has_stack
      && target_has_stack
      && target_has_memory)
      && target_has_memory)
    restore_selected_frame (old->selected_frame_id,
    restore_selected_frame (old->selected_frame_id,
                            old->selected_frame_level);
                            old->selected_frame_level);
}
}
 
 
static void
static void
restore_current_thread_cleanup_dtor (void *arg)
restore_current_thread_cleanup_dtor (void *arg)
{
{
  struct current_thread_cleanup *old = arg;
  struct current_thread_cleanup *old = arg;
  struct thread_info *tp;
  struct thread_info *tp;
  tp = find_thread_ptid (old->inferior_ptid);
  tp = find_thread_ptid (old->inferior_ptid);
  if (tp)
  if (tp)
    tp->refcount--;
    tp->refcount--;
  xfree (old);
  xfree (old);
}
}
 
 
struct cleanup *
struct cleanup *
make_cleanup_restore_current_thread (void)
make_cleanup_restore_current_thread (void)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  struct frame_info *frame;
  struct frame_info *frame;
  struct current_thread_cleanup *old;
  struct current_thread_cleanup *old;
 
 
  old = xmalloc (sizeof (struct current_thread_cleanup));
  old = xmalloc (sizeof (struct current_thread_cleanup));
  old->inferior_ptid = inferior_ptid;
  old->inferior_ptid = inferior_ptid;
  old->inf_id = current_inferior ()->num;
  old->inf_id = current_inferior ()->num;
 
 
  if (!ptid_equal (inferior_ptid, null_ptid))
  if (!ptid_equal (inferior_ptid, null_ptid))
    {
    {
      old->was_stopped = is_stopped (inferior_ptid);
      old->was_stopped = is_stopped (inferior_ptid);
      if (old->was_stopped
      if (old->was_stopped
          && target_has_registers
          && target_has_registers
          && target_has_stack
          && target_has_stack
          && target_has_memory)
          && target_has_memory)
        frame = get_selected_frame (NULL);
        frame = get_selected_frame (NULL);
      else
      else
        frame = NULL;
        frame = NULL;
 
 
      old->selected_frame_id = get_frame_id (frame);
      old->selected_frame_id = get_frame_id (frame);
      old->selected_frame_level = frame_relative_level (frame);
      old->selected_frame_level = frame_relative_level (frame);
 
 
      tp = find_thread_ptid (inferior_ptid);
      tp = find_thread_ptid (inferior_ptid);
      if (tp)
      if (tp)
        tp->refcount++;
        tp->refcount++;
    }
    }
 
 
  return make_cleanup_dtor (do_restore_current_thread_cleanup, old,
  return make_cleanup_dtor (do_restore_current_thread_cleanup, old,
                            restore_current_thread_cleanup_dtor);
                            restore_current_thread_cleanup_dtor);
}
}
 
 
/* Apply a GDB command to a list of threads.  List syntax is a whitespace
/* 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
   seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
   of two numbers seperated by a hyphen.  Examples:
   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 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 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
   thread apply all p x/i $pc   Apply x/i $pc cmd to all threads
 */
 */
 
 
static void
static void
thread_apply_all_command (char *cmd, int from_tty)
thread_apply_all_command (char *cmd, int from_tty)
{
{
  struct thread_info *tp;
  struct thread_info *tp;
  struct cleanup *old_chain;
  struct cleanup *old_chain;
  char *saved_cmd;
  char *saved_cmd;
 
 
  if (cmd == NULL || *cmd == '\000')
  if (cmd == NULL || *cmd == '\000')
    error (_("Please specify a command following the thread ID list"));
    error (_("Please specify a command following the thread ID list"));
 
 
  update_thread_list ();
  update_thread_list ();
 
 
  old_chain = make_cleanup_restore_current_thread ();
  old_chain = make_cleanup_restore_current_thread ();
 
 
  /* Save a copy of the command in case it is clobbered by
  /* Save a copy of the command in case it is clobbered by
     execute_command */
     execute_command */
  saved_cmd = xstrdup (cmd);
  saved_cmd = xstrdup (cmd);
  make_cleanup (xfree, saved_cmd);
  make_cleanup (xfree, saved_cmd);
  for (tp = thread_list; tp; tp = tp->next)
  for (tp = thread_list; tp; tp = tp->next)
    if (thread_alive (tp))
    if (thread_alive (tp))
      {
      {
        switch_to_thread (tp->ptid);
        switch_to_thread (tp->ptid);
 
 
        printf_filtered (_("\nThread %d (%s):\n"),
        printf_filtered (_("\nThread %d (%s):\n"),
                         tp->num, target_pid_to_str (inferior_ptid));
                         tp->num, target_pid_to_str (inferior_ptid));
        execute_command (cmd, from_tty);
        execute_command (cmd, from_tty);
        strcpy (cmd, saved_cmd);        /* Restore exact command used previously */
        strcpy (cmd, saved_cmd);        /* Restore exact command used previously */
      }
      }
 
 
  do_cleanups (old_chain);
  do_cleanups (old_chain);
}
}
 
 
static void
static void
thread_apply_command (char *tidlist, int from_tty)
thread_apply_command (char *tidlist, int from_tty)
{
{
  char *cmd;
  char *cmd;
  char *p;
  char *p;
  struct cleanup *old_chain;
  struct cleanup *old_chain;
  char *saved_cmd;
  char *saved_cmd;
 
 
  if (tidlist == NULL || *tidlist == '\000')
  if (tidlist == NULL || *tidlist == '\000')
    error (_("Please specify a thread ID list"));
    error (_("Please specify a thread ID list"));
 
 
  for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
  for (cmd = tidlist; *cmd != '\000' && !isalpha (*cmd); cmd++);
 
 
  if (*cmd == '\000')
  if (*cmd == '\000')
    error (_("Please specify a command following the thread ID list"));
    error (_("Please specify a command following the thread ID list"));
 
 
  /* Save a copy of the command in case it is clobbered by
  /* Save a copy of the command in case it is clobbered by
     execute_command */
     execute_command */
  saved_cmd = xstrdup (cmd);
  saved_cmd = xstrdup (cmd);
  old_chain = make_cleanup (xfree, saved_cmd);
  old_chain = make_cleanup (xfree, saved_cmd);
  while (tidlist < cmd)
  while (tidlist < cmd)
    {
    {
      struct thread_info *tp;
      struct thread_info *tp;
      int start, end;
      int start, end;
 
 
      start = strtol (tidlist, &p, 10);
      start = strtol (tidlist, &p, 10);
      if (p == tidlist)
      if (p == tidlist)
        error (_("Error parsing %s"), tidlist);
        error (_("Error parsing %s"), tidlist);
      tidlist = p;
      tidlist = p;
 
 
      while (*tidlist == ' ' || *tidlist == '\t')
      while (*tidlist == ' ' || *tidlist == '\t')
        tidlist++;
        tidlist++;
 
 
      if (*tidlist == '-')      /* Got a range of IDs? */
      if (*tidlist == '-')      /* Got a range of IDs? */
        {
        {
          tidlist++;            /* Skip the - */
          tidlist++;            /* Skip the - */
          end = strtol (tidlist, &p, 10);
          end = strtol (tidlist, &p, 10);
          if (p == tidlist)
          if (p == tidlist)
            error (_("Error parsing %s"), tidlist);
            error (_("Error parsing %s"), tidlist);
          tidlist = p;
          tidlist = p;
 
 
          while (*tidlist == ' ' || *tidlist == '\t')
          while (*tidlist == ' ' || *tidlist == '\t')
            tidlist++;
            tidlist++;
        }
        }
      else
      else
        end = start;
        end = start;
 
 
      make_cleanup_restore_current_thread ();
      make_cleanup_restore_current_thread ();
 
 
      for (; start <= end; start++)
      for (; start <= end; start++)
        {
        {
          tp = find_thread_id (start);
          tp = find_thread_id (start);
 
 
          if (!tp)
          if (!tp)
            warning (_("Unknown thread %d."), start);
            warning (_("Unknown thread %d."), start);
          else if (!thread_alive (tp))
          else if (!thread_alive (tp))
            warning (_("Thread %d has terminated."), start);
            warning (_("Thread %d has terminated."), start);
          else
          else
            {
            {
              switch_to_thread (tp->ptid);
              switch_to_thread (tp->ptid);
 
 
              printf_filtered (_("\nThread %d (%s):\n"), tp->num,
              printf_filtered (_("\nThread %d (%s):\n"), tp->num,
                               target_pid_to_str (inferior_ptid));
                               target_pid_to_str (inferior_ptid));
              execute_command (cmd, from_tty);
              execute_command (cmd, from_tty);
 
 
              /* Restore exact command used previously.  */
              /* Restore exact command used previously.  */
              strcpy (cmd, saved_cmd);
              strcpy (cmd, saved_cmd);
            }
            }
        }
        }
    }
    }
 
 
  do_cleanups (old_chain);
  do_cleanups (old_chain);
}
}
 
 
/* Switch to the specified thread.  Will dispatch off to thread_apply_command
/* Switch to the specified thread.  Will dispatch off to thread_apply_command
   if prefix of arg is `apply'.  */
   if prefix of arg is `apply'.  */
 
 
static void
static void
thread_command (char *tidstr, int from_tty)
thread_command (char *tidstr, int from_tty)
{
{
  if (!tidstr)
  if (!tidstr)
    {
    {
      if (ptid_equal (inferior_ptid, null_ptid))
      if (ptid_equal (inferior_ptid, null_ptid))
        error (_("No thread selected"));
        error (_("No thread selected"));
 
 
      if (target_has_stack)
      if (target_has_stack)
        {
        {
          if (is_exited (inferior_ptid))
          if (is_exited (inferior_ptid))
            printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
            printf_filtered (_("[Current thread is %d (%s) (exited)]\n"),
                             pid_to_thread_id (inferior_ptid),
                             pid_to_thread_id (inferior_ptid),
                             target_pid_to_str (inferior_ptid));
                             target_pid_to_str (inferior_ptid));
          else
          else
            printf_filtered (_("[Current thread is %d (%s)]\n"),
            printf_filtered (_("[Current thread is %d (%s)]\n"),
                             pid_to_thread_id (inferior_ptid),
                             pid_to_thread_id (inferior_ptid),
                             target_pid_to_str (inferior_ptid));
                             target_pid_to_str (inferior_ptid));
        }
        }
      else
      else
        error (_("No stack."));
        error (_("No stack."));
      return;
      return;
    }
    }
 
 
  gdb_thread_select (uiout, tidstr, NULL);
  gdb_thread_select (uiout, tidstr, NULL);
}
}
 
 
/* Print notices when new threads are attached and detached.  */
/* Print notices when new threads are attached and detached.  */
int print_thread_events = 1;
int print_thread_events = 1;
static void
static void
show_print_thread_events (struct ui_file *file, int from_tty,
show_print_thread_events (struct ui_file *file, int from_tty,
                          struct cmd_list_element *c, const char *value)
                          struct cmd_list_element *c, const char *value)
{
{
  fprintf_filtered (file, _("\
  fprintf_filtered (file, _("\
Printing of thread events is %s.\n"),
Printing of thread events is %s.\n"),
                    value);
                    value);
}
}
 
 
static int
static int
do_captured_thread_select (struct ui_out *uiout, void *tidstr)
do_captured_thread_select (struct ui_out *uiout, void *tidstr)
{
{
  int num;
  int num;
  struct thread_info *tp;
  struct thread_info *tp;
 
 
  num = value_as_long (parse_and_eval (tidstr));
  num = value_as_long (parse_and_eval (tidstr));
 
 
  tp = find_thread_id (num);
  tp = find_thread_id (num);
 
 
  if (!tp)
  if (!tp)
    error (_("Thread ID %d not known."), num);
    error (_("Thread ID %d not known."), num);
 
 
  if (!thread_alive (tp))
  if (!thread_alive (tp))
    error (_("Thread ID %d has terminated."), num);
    error (_("Thread ID %d has terminated."), num);
 
 
  switch_to_thread (tp->ptid);
  switch_to_thread (tp->ptid);
 
 
  annotate_thread_changed ();
  annotate_thread_changed ();
 
 
  ui_out_text (uiout, "[Switching to thread ");
  ui_out_text (uiout, "[Switching to thread ");
  ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
  ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_ptid));
  ui_out_text (uiout, " (");
  ui_out_text (uiout, " (");
  ui_out_text (uiout, target_pid_to_str (inferior_ptid));
  ui_out_text (uiout, target_pid_to_str (inferior_ptid));
  ui_out_text (uiout, ")]");
  ui_out_text (uiout, ")]");
 
 
  /* Note that we can't reach this with an exited thread, due to the
  /* Note that we can't reach this with an exited thread, due to the
     thread_alive check above.  */
     thread_alive check above.  */
  if (tp->state_ == THREAD_RUNNING)
  if (tp->state_ == THREAD_RUNNING)
    ui_out_text (uiout, "(running)\n");
    ui_out_text (uiout, "(running)\n");
  else
  else
    print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
    print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
 
 
  /* Since the current thread may have changed, see if there is any
  /* Since the current thread may have changed, see if there is any
     exited thread we can now delete.  */
     exited thread we can now delete.  */
  prune_threads ();
  prune_threads ();
 
 
  return GDB_RC_OK;
  return GDB_RC_OK;
}
}
 
 
enum gdb_rc
enum gdb_rc
gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
gdb_thread_select (struct ui_out *uiout, char *tidstr, char **error_message)
{
{
  if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
  if (catch_exceptions_with_msg (uiout, do_captured_thread_select, tidstr,
                                 error_message, RETURN_MASK_ALL) < 0)
                                 error_message, RETURN_MASK_ALL) < 0)
    return GDB_RC_FAIL;
    return GDB_RC_FAIL;
  return GDB_RC_OK;
  return GDB_RC_OK;
}
}
 
 
void
void
update_thread_list (void)
update_thread_list (void)
{
{
  prune_threads ();
  prune_threads ();
  target_find_new_threads ();
  target_find_new_threads ();
}
}
 
 
/* Commands with a prefix of `thread'.  */
/* Commands with a prefix of `thread'.  */
struct cmd_list_element *thread_cmd_list = NULL;
struct cmd_list_element *thread_cmd_list = NULL;
 
 
void
void
_initialize_thread (void)
_initialize_thread (void)
{
{
  static struct cmd_list_element *thread_apply_list = NULL;
  static struct cmd_list_element *thread_apply_list = NULL;
 
 
  add_info ("threads", info_threads_command,
  add_info ("threads", info_threads_command,
            _("IDs of currently known threads."));
            _("IDs of currently known threads."));
 
 
  add_prefix_cmd ("thread", class_run, thread_command, _("\
  add_prefix_cmd ("thread", class_run, thread_command, _("\
Use this command to switch between threads.\n\
Use this command to switch between threads.\n\
The new thread ID must be currently known."),
The new thread ID must be currently known."),
                  &thread_cmd_list, "thread ", 1, &cmdlist);
                  &thread_cmd_list, "thread ", 1, &cmdlist);
 
 
  add_prefix_cmd ("apply", class_run, thread_apply_command,
  add_prefix_cmd ("apply", class_run, thread_apply_command,
                  _("Apply a command to a list of threads."),
                  _("Apply a command to a list of threads."),
                  &thread_apply_list, "thread apply ", 1, &thread_cmd_list);
                  &thread_apply_list, "thread apply ", 1, &thread_cmd_list);
 
 
  add_cmd ("all", class_run, thread_apply_all_command,
  add_cmd ("all", class_run, thread_apply_all_command,
           _("Apply a command to all threads."), &thread_apply_list);
           _("Apply a command to all threads."), &thread_apply_list);
 
 
  if (!xdb_commands)
  if (!xdb_commands)
    add_com_alias ("t", "thread", class_run, 1);
    add_com_alias ("t", "thread", class_run, 1);
 
 
  add_setshow_boolean_cmd ("thread-events", no_class,
  add_setshow_boolean_cmd ("thread-events", no_class,
         &print_thread_events, _("\
         &print_thread_events, _("\
Set printing of thread events (such as thread start and exit)."), _("\
Set printing of thread events (such as thread start and exit)."), _("\
Show printing of thread events (such as thread start and exit)."), NULL,
Show printing of thread events (such as thread start and exit)."), NULL,
         NULL,
         NULL,
         show_print_thread_events,
         show_print_thread_events,
         &setprintlist, &showprintlist);
         &setprintlist, &showprintlist);
}
}
 
 

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