[deliverable/binutils-gdb.git] / gdb / thread.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., 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
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;
  char *p;

  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);
}
Commit	Line	Data
da0baf42 SG	1	/* Multi-process/thread control for GDB, the GNU debugger.
	2	Copyright 1986, 1987, 1988, 1993
	3
	4	Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
	5	Free Software Foundation, Inc.
	6
	7	This file is part of GDB.
	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program; if not, write to the Free Software
	21	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25286543 SG	22
	23	#include "defs.h"
	24	#include "symtab.h"
	25	#include "frame.h"
	26	#include "inferior.h"
	27	#include "environ.h"
	28	#include "value.h"
	29	#include "target.h"
	30	#include "thread.h"
46c28185	31	#include "command.h"
25286543 SG	32
	33	#include <sys/types.h>
	34	#include <signal.h>
	35
	36	/#include "lynxos-core.h"/
	37
	38	struct thread_info
	39	{
	40	struct thread_info *next;
	41	int pid; /* Actual process id */
	42	int num; /* Convenient handle */
	43	};
	44
	45	static struct thread_info *thread_list = NULL;
	46	static int highest_thread_num;
	47
25286543 SG	48	static void thread_command PARAMS ((char * tidstr, int from_tty));
	49
	50	static void prune_threads PARAMS ((void));
	51
	52	static void thread_switch PARAMS ((int pid));
	53
de43d7d0 SG	54	static struct thread_info * find_thread_id PARAMS ((int num));
de43d7d0 SG	55
25286543 SG	56	void
	57	init_thread_list ()
	58	{
	59	struct thread_info tp, tpnext;
	60
	61	if (!thread_list)
	62	return;
	63
	64	for (tp = thread_list; tp; tp = tpnext)
	65	{
	66	tpnext = tp->next;
	67	free (tp);
	68	}
	69
	70	thread_list = NULL;
	71	highest_thread_num = 0;
	72	}
	73
	74	void
	75	add_thread (pid)
	76	int pid;
	77	{
	78	struct thread_info *tp;
	79
3082244d	80	tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
25286543 SG	81
	82	tp->pid = pid;
	83	tp->num = ++highest_thread_num;
	84	tp->next = thread_list;
	85	thread_list = tp;
	86	}
	87
	88	static struct thread_info *
	89	find_thread_id (num)
	90	int num;
	91	{
	92	struct thread_info *tp;
	93
	94	for (tp = thread_list; tp; tp = tp->next)
	95	if (tp->num == num)
	96	return tp;
	97
	98	return NULL;
	99	}
	100
de43d7d0 SG	101	int
	102	valid_thread_id (num)
	103	int num;
	104	{
	105	struct thread_info *tp;
	106
	107	for (tp = thread_list; tp; tp = tp->next)
	108	if (tp->num == num)
	109	return 1;
	110
	111	return 0;
	112	}
	113
	114	int
	115	pid_to_thread_id (pid)
	116	int pid;
	117	{
	118	struct thread_info *tp;
	119
	120	for (tp = thread_list; tp; tp = tp->next)
	121	if (tp->pid == pid)
	122	return tp->num;
	123
	124	return 0;
	125	}
	126
25286543 SG	127	int
	128	in_thread_list (pid)
	129	int pid;
	130	{
	131	struct thread_info *tp;
	132
	133	for (tp = thread_list; tp; tp = tp->next)
	134	if (tp->pid == pid)
	135	return 1;
	136
	137	return 0; /* Never heard of 'im */
	138	}
	139
25286543 SG	140	static void
	141	prune_threads ()
	142	{
	143	struct thread_info tp, tpprev;
	144
	145	tpprev = 0;
	146
	147	for (tp = thread_list; tp; tp = tp->next)
	148	if (tp->pid == -1)
	149	{
	150	if (tpprev)
	151	tpprev->next = tp->next;
	152	else
	153	thread_list = NULL;
	154
	155	free (tp);
	156	}
	157	else
	158	tpprev = tp;
	159	}
	160
	161	/* Print information about currently known threads */
	162
	163	static void
	164	info_threads_command (arg, from_tty)
	165	char *arg;
	166	int from_tty;
	167	{
	168	struct thread_info *tp;
	169	int current_pid = inferior_pid;
	170
	171	for (tp = thread_list; tp; tp = tp->next)
	172	{
	173	if (target_has_execution
	174	&& kill (tp->pid, 0) == -1)
	175	{
46c28185	176	tp->pid = -1; /* Mark it as dead */
25286543 SG	177	continue;
	178	}
	179
	180	if (tp->pid == current_pid)
	181	printf_filtered ("* ");
	182	else
	183	printf_filtered (" ");
	184
	185	printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
	186
	187	thread_switch (tp->pid);
	188	print_stack_frame (selected_frame, -1, 0);
	189	}
	190
	191	thread_switch (current_pid);
	192	prune_threads ();
	193	}
	194
	195	/* Switch from one thread to another. */
	196
3082244d	197	static void
25286543 SG	198	thread_switch (pid)
	199	int pid;
	200	{
	201	if (pid == inferior_pid)
	202	return;
	203
	204	inferior_pid = pid;
25286543 SG	205	flush_cached_frames ();
	206	registers_changed ();
	207	stop_pc = read_pc();
	208	set_current_frame (create_new_frame (read_fp (), stop_pc));
	209	stop_frame_address = FRAME_FP (get_current_frame ());
	210	select_frame (get_current_frame (), 0);
	211	}
	212
5090e82c SG	213	static void
	214	restore_current_thread (pid)
	215	int pid;
	216	{
	217	if (pid != inferior_pid)
	218	thread_switch (pid);
	219	}
	220
	221	/* Apply a GDB command to a list of threads. List syntax is a whitespace
	222	seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
	223	of two numbers seperated by a hyphen. Examples:
	224
	225	thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
	226	thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
	227	thread apply all p x/i $pc Apply x/i $pc cmd to all threads
	228	*/
	229
	230	static void
	231	thread_apply_all_command (cmd, from_tty)
	232	char *cmd;
	233	int from_tty;
	234	{
	235	struct thread_info *tp;
	236	struct cleanup *old_chain;
	237
	238	if (cmd == NULL \|\| *cmd == '\000')
	239	error ("Please specify a command following the thread ID list");
	240
	241	old_chain = make_cleanup (restore_current_thread, inferior_pid);
	242
	243	for (tp = thread_list; tp; tp = tp->next)
	244	{
	245	thread_switch (tp->pid);
	246	printf_filtered ("\nThread %d (%s):\n", tp->num,
	247	target_pid_to_str (inferior_pid));
	248	execute_command (cmd, from_tty);
	249	}
	250	}
	251
	252	static void
	253	thread_apply_command (tidlist, from_tty)
	254	char *tidlist;
	255	int from_tty;
	256	{
	257	char *cmd;
	258	char *p;
	259	struct cleanup *old_chain;
	260
	261	if (tidlist == NULL \|\| *tidlist == '\000')
	262	error ("Please specify a thread ID list");
	263
	264	for (cmd = tidlist; cmd != '\000' && !isalpha(cmd); cmd++);
	265
	266	if (*cmd == '\000')
	267	error ("Please specify a command following the thread ID list");
	268
	269	old_chain = make_cleanup (restore_current_thread, inferior_pid);
	270
	271	while (tidlist < cmd)
	272	{
	273	struct thread_info *tp;
	274	int start, end;
	275
	276	start = strtol (tidlist, &p, 10);
277	if (p == tidlist)
278	error ("Error parsing %s", tidlist);
279	tidlist = p;
280
281	while (tidlist == ' ' \|\| tidlist == '\t')
282	tidlist++;
283
284	if (tidlist == '-') / Got a range of IDs? */
285	{
286	tidlist++; /* Skip the - */
287	end = strtol (tidlist, &p, 10);
288	if (p == tidlist)
289	error ("Error parsing %s", tidlist);
290	tidlist = p;
291
292	while (tidlist == ' ' \|\| tidlist == '\t')
293	tidlist++;
294	}
295	else
296	end = start;
297
298	for (; start <= end; start++)
299	{
300	tp = find_thread_id (start);
301
302	if (!tp)
303	{
304	warning ("Unknown thread %d.", start);
305	continue;
306	}
307
308	thread_switch (tp->pid);
309	printf_filtered ("\nThread %d (%s):\n", tp->num,
310	target_pid_to_str (inferior_pid));
311	execute_command (cmd, from_tty);
312	}
313	}
314	}
315
316	/* Switch to the specified thread. Will dispatch off to thread_apply_command
317	if prefix of arg is `apply'. */
318
25286543 SG	319	static void
	320	thread_command (tidstr, from_tty)
	321	char *tidstr;
	322	int from_tty;
	323	{
	324	int num;
	325	struct thread_info *tp;
5090e82c	326	char *p;
25286543 SG	327
	328	if (!tidstr)
	329	error ("Please specify a thread ID. Use the \"info threads\" command to\n\
	330	see the IDs of currently known threads.");
	331
25286543 SG	332	num = atoi (tidstr);
	333
	334	tp = find_thread_id (num);
	335
	336	if (!tp)
	337	error ("Thread ID %d not known. Use the \"info threads\" command to\n\
	338	see the IDs of currently known threads.", num);
	339
	340	thread_switch (tp->pid);
	341
	342	printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
	343	print_stack_frame (selected_frame, selected_frame_level, 1);
	344	}
	345
	346	void
	347	_initialize_thread ()
	348	{
5090e82c SG	349	static struct cmd_list_element *thread_cmd_list = NULL;
	350	static struct cmd_list_element *thread_apply_list = NULL;
	351	extern struct cmd_list_element *cmdlist;
	352
25286543 SG	353	add_info ("threads", info_threads_command,
25286543 SG	354	"IDs of currently known threads.");
5090e82c SG	355
	356	add_prefix_cmd ("thread", class_run, thread_command,
	357	"Use this command to switch between threads.\n\
	358	The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
	359	&cmdlist);
	360
	361	add_prefix_cmd ("apply", class_run, thread_apply_command,
	362	"Apply a command to a list of threads.",
	363	&thread_apply_list, "apply ", 1, &thread_cmd_list);
	364
	365	add_cmd ("all", class_run, thread_apply_all_command,
	366	"Apply a command to all threads.",
	367	&thread_apply_list);
	368
	369	add_com_alias ("t", "thread", class_run, 1);
25286543	370	}