[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 "gdbcmd.h"

#include <ctype.h>
#include <sys/types.h>
#include <signal.h>

/*#include "lynxos-core.h"*/

struct thread_info
{
  struct thread_info *next;
  int pid;			/* Actual process id */
  int num;			/* Convenient handle */
};

static struct thread_info *thread_list = NULL;
static int highest_thread_num;

static void thread_command PARAMS ((char * tidstr, int from_tty));

static void prune_threads PARAMS ((void));

static void thread_switch PARAMS ((int pid));

static struct thread_info * find_thread_id PARAMS ((int num));

void
init_thread_list ()
{
  struct thread_info *tp, *tpnext;

  if (!thread_list)
    return;

  for (tp = thread_list; tp; tp = tpnext)
    {
      tpnext = tp->next;
      free (tp);
    }

  thread_list = NULL;
  highest_thread_num = 0;
}

void
add_thread (pid)
     int pid;
{
  struct thread_info *tp;

  tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));

  tp->pid = pid;
  tp->num = ++highest_thread_num;
  tp->next = thread_list;
  thread_list = tp;
}

static struct thread_info *
find_thread_id (num)
    int num;
{
  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)
    if (tp->num == num)
      return tp;

  return NULL;
}

int
valid_thread_id (num)
    int num;
{
  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)
    if (tp->num == num)
      return 1;

  return 0;
}

int
pid_to_thread_id (pid)
    int pid;
{
  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)
    if (tp->pid == pid)
      return tp->num;

  return 0;
}

int
in_thread_list (pid)
    int pid;
{
  struct thread_info *tp;

  for (tp = thread_list; tp; tp = tp->next)
    if (tp->pid == pid)
      return 1;

  return 0;			/* Never heard of 'im */
}

static void
prune_threads ()
{
  struct thread_info *tp, *tpprev;

  tpprev = 0;

  for (tp = thread_list; tp; tp = tp->next)
    if (tp->pid == -1)
      {
 	if (tpprev)
	  tpprev->next = tp->next;
 	else
	  thread_list = NULL;

	free (tp);
      }
    else
      tpprev = tp;
}

/* Print information about currently known threads */

static void
info_threads_command (arg, from_tty)
     char *arg;
     int from_tty;
{
  struct thread_info *tp;
  int current_pid = inferior_pid;

  /* Avoid coredumps which would happen if we tried to access a NULL
     selected_frame.  */
  if (!target_has_stack) error ("No stack.");

  for (tp = thread_list; tp; tp = tp->next)
    {
      /* FIXME: need to figure out a way to do this for remote too,
	 or else the print_stack_frame below will fail with a bogus
	 thread ID.  */
      if (!STREQ (current_target.to_shortname, "remote")
	  && target_has_execution
	  && kill (tp->pid, 0) == -1)
 	{
	  tp->pid = -1;	/* Mark it as dead */
	  continue;
 	}

      if (tp->pid == current_pid)
	printf_filtered ("* ");
      else
	printf_filtered ("  ");

      printf_filtered ("%d %s  ", tp->num, target_pid_to_str (tp->pid));

      thread_switch (tp->pid);
      print_stack_frame (selected_frame, -1, 0);
    }

  thread_switch (current_pid);
  prune_threads ();
}

/* Switch from one thread to another. */

static void
thread_switch (pid)
     int pid;
{
  if (pid == inferior_pid)
    return;

  inferior_pid = pid;
  flush_cached_frames ();
  registers_changed ();
  stop_pc = read_pc();
  select_frame (get_current_frame (), 0);
}

static void
restore_current_thread (pid)
     int pid;
{
  if (pid != inferior_pid)
    thread_switch (pid);
}

/* Apply a GDB command to a list of threads.  List syntax is a whitespace
   seperated list of numbers, or ranges, or the keyword `all'.  Ranges consist
   of two numbers seperated by a hyphen.  Examples:

	thread apply 1 2 7 4 backtrace	Apply backtrace cmd to threads 1,2,7,4
	thread apply 2-7 9 p foo(1)	Apply p foo(1) cmd to threads 2->7 & 9
	thread apply all p x/i $pc	Apply x/i $pc cmd to all threads
*/

static void
thread_apply_all_command (cmd, from_tty)
     char *cmd;
     int from_tty;
{
  struct thread_info *tp;
  struct cleanup *old_chain;

  if (cmd == NULL || *cmd == '\000')
    error ("Please specify a command following the thread ID list");

  old_chain = make_cleanup (restore_current_thread, inferior_pid);

  for (tp = thread_list; tp; tp = tp->next)
    {
      thread_switch (tp->pid);
      printf_filtered ("\nThread %d (%s):\n", tp->num,
		       target_pid_to_str (inferior_pid));
      execute_command (cmd, from_tty);
    }
}

static void
thread_apply_command (tidlist, from_tty)
     char *tidlist;
     int from_tty;
{
  char *cmd;
  char *p;
  struct cleanup *old_chain;

  if (tidlist == NULL || *tidlist == '\000')
    error ("Please specify a thread ID list");

  for (cmd = tidlist; *cmd != '\000' && !isalpha(*cmd); cmd++);

  if (*cmd == '\000')
    error ("Please specify a command following the thread ID list");

  old_chain = make_cleanup (restore_current_thread, inferior_pid);

  while (tidlist < cmd)
    {
      struct thread_info *tp;
      int start, end;

      start = strtol (tidlist, &p, 10);
      if (p == tidlist)
	error ("Error parsing %s", tidlist);
      tidlist = p;

      while (*tidlist == ' ' || *tidlist == '\t')
	tidlist++;

      if (*tidlist == '-')	/* Got a range of IDs? */
	{
	  tidlist++;	/* Skip the - */
	  end = strtol (tidlist, &p, 10);
	  if (p == tidlist)
	    error ("Error parsing %s", tidlist);
	  tidlist = p;

	  while (*tidlist == ' ' || *tidlist == '\t')
	    tidlist++;
	}
      else
	end = start;

      for (; start <= end; start++)
	{
	  tp = find_thread_id (start);

	  if (!tp)
	    {
	      warning ("Unknown thread %d.", start);
	      continue;
	    }

	  thread_switch (tp->pid);
	  printf_filtered ("\nThread %d (%s):\n", tp->num,
			   target_pid_to_str (inferior_pid));
	  execute_command (cmd, from_tty);
	}
    }
}

/* Switch to the specified thread.  Will dispatch off to thread_apply_command
   if prefix of arg is `apply'.  */

static void
thread_command (tidstr, from_tty)
     char *tidstr;
     int from_tty;
{
  int num;
  struct thread_info *tp;

  if (!tidstr)
    error ("Please specify a thread ID.  Use the \"info threads\" command to\n\
see the IDs of currently known threads.");

  num = atoi (tidstr);

  tp = find_thread_id (num);

  if (!tp)
    error ("Thread ID %d not known.  Use the \"info threads\" command to\n\
see the IDs of currently known threads.", num);

  thread_switch (tp->pid);

  printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
  print_stack_frame (selected_frame, selected_frame_level, 1);
}

void
_initialize_thread ()
{
  static struct cmd_list_element *thread_cmd_list = NULL;
  static struct cmd_list_element *thread_apply_list = NULL;
  extern struct cmd_list_element *cmdlist;

  add_info ("threads", info_threads_command,
	    "IDs of currently known threads.");

  add_prefix_cmd ("thread", class_run, thread_command,
		  "Use this command to switch between threads.\n\
The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
		  &cmdlist);

  add_prefix_cmd ("apply", class_run, thread_apply_command,
		  "Apply a command to a list of threads.",
		  &thread_apply_list, "apply ", 1, &thread_cmd_list);

  add_cmd ("all", class_run, thread_apply_all_command,
	   "Apply a command to all threads.",
	   &thread_apply_list);

  add_com_alias ("t", "thread", class_run, 1);
}
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"
89ce0c8f	32	#include "gdbcmd.h"
25286543	33
89ce0c8f	34	#include <ctype.h>
25286543 SG	35	#include <sys/types.h>
	36	#include <signal.h>
	37
	38	/#include "lynxos-core.h"/
	39
	40	struct thread_info
	41	{
	42	struct thread_info *next;
	43	int pid; /* Actual process id */
	44	int num; /* Convenient handle */
	45	};
	46
	47	static struct thread_info *thread_list = NULL;
	48	static int highest_thread_num;
	49
25286543 SG	50	static void thread_command PARAMS ((char * tidstr, int from_tty));
	51
	52	static void prune_threads PARAMS ((void));
	53
	54	static void thread_switch PARAMS ((int pid));
	55
de43d7d0 SG	56	static struct thread_info * find_thread_id PARAMS ((int num));
de43d7d0 SG	57
25286543 SG	58	void
	59	init_thread_list ()
	60	{
	61	struct thread_info tp, tpnext;
	62
	63	if (!thread_list)
	64	return;
	65
	66	for (tp = thread_list; tp; tp = tpnext)
	67	{
	68	tpnext = tp->next;
	69	free (tp);
	70	}
	71
	72	thread_list = NULL;
	73	highest_thread_num = 0;
	74	}
	75
	76	void
	77	add_thread (pid)
	78	int pid;
	79	{
	80	struct thread_info *tp;
	81
3082244d	82	tp = (struct thread_info *) xmalloc (sizeof (struct thread_info));
25286543 SG	83
	84	tp->pid = pid;
	85	tp->num = ++highest_thread_num;
	86	tp->next = thread_list;
	87	thread_list = tp;
	88	}
	89
	90	static struct thread_info *
	91	find_thread_id (num)
	92	int num;
	93	{
	94	struct thread_info *tp;
	95
	96	for (tp = thread_list; tp; tp = tp->next)
	97	if (tp->num == num)
	98	return tp;
	99
	100	return NULL;
	101	}
	102
de43d7d0 SG	103	int
	104	valid_thread_id (num)
	105	int num;
	106	{
	107	struct thread_info *tp;
	108
	109	for (tp = thread_list; tp; tp = tp->next)
	110	if (tp->num == num)
	111	return 1;
	112
	113	return 0;
	114	}
	115
	116	int
	117	pid_to_thread_id (pid)
	118	int pid;
	119	{
	120	struct thread_info *tp;
	121
	122	for (tp = thread_list; tp; tp = tp->next)
	123	if (tp->pid == pid)
	124	return tp->num;
	125
	126	return 0;
	127	}
	128
25286543 SG	129	int
	130	in_thread_list (pid)
	131	int pid;
	132	{
	133	struct thread_info *tp;
	134
	135	for (tp = thread_list; tp; tp = tp->next)
	136	if (tp->pid == pid)
	137	return 1;
	138
	139	return 0; /* Never heard of 'im */
	140	}
	141
25286543 SG	142	static void
	143	prune_threads ()
	144	{
	145	struct thread_info tp, tpprev;
	146
	147	tpprev = 0;
	148
	149	for (tp = thread_list; tp; tp = tp->next)
	150	if (tp->pid == -1)
	151	{
	152	if (tpprev)
	153	tpprev->next = tp->next;
	154	else
	155	thread_list = NULL;
	156
	157	free (tp);
	158	}
	159	else
	160	tpprev = tp;
	161	}
	162
	163	/* Print information about currently known threads */
	164
	165	static void
	166	info_threads_command (arg, from_tty)
	167	char *arg;
	168	int from_tty;
	169	{
	170	struct thread_info *tp;
	171	int current_pid = inferior_pid;
	172
4cc1b3f7 JK	173	/* Avoid coredumps which would happen if we tried to access a NULL
	174	selected_frame. */
	175	if (!target_has_stack) error ("No stack.");
	176
25286543 SG	177	for (tp = thread_list; tp; tp = tp->next)
25286543 SG	178	{
4cc1b3f7 JK	179	/* FIXME: need to figure out a way to do this for remote too,
	180	or else the print_stack_frame below will fail with a bogus
	181	thread ID. */
	182	if (!STREQ (current_target.to_shortname, "remote")
	183	&& target_has_execution
25286543 SG	184	&& kill (tp->pid, 0) == -1)
25286543 SG	185	{
46c28185	186	tp->pid = -1; /* Mark it as dead */
25286543 SG	187	continue;
	188	}
	189
	190	if (tp->pid == current_pid)
	191	printf_filtered ("* ");
	192	else
	193	printf_filtered (" ");
	194
	195	printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
	196
	197	thread_switch (tp->pid);
	198	print_stack_frame (selected_frame, -1, 0);
	199	}
	200
	201	thread_switch (current_pid);
	202	prune_threads ();
	203	}
	204
	205	/* Switch from one thread to another. */
	206
3082244d	207	static void
25286543 SG	208	thread_switch (pid)
	209	int pid;
	210	{
	211	if (pid == inferior_pid)
	212	return;
	213
	214	inferior_pid = pid;
25286543 SG	215	flush_cached_frames ();
	216	registers_changed ();
	217	stop_pc = read_pc();
25286543 SG	218	select_frame (get_current_frame (), 0);
	219	}
	220
5090e82c SG	221	static void
	222	restore_current_thread (pid)
	223	int pid;
	224	{
	225	if (pid != inferior_pid)
	226	thread_switch (pid);
	227	}
	228
	229	/* Apply a GDB command to a list of threads. List syntax is a whitespace
	230	seperated list of numbers, or ranges, or the keyword `all'. Ranges consist
	231	of two numbers seperated by a hyphen. Examples:
	232
	233	thread apply 1 2 7 4 backtrace Apply backtrace cmd to threads 1,2,7,4
	234	thread apply 2-7 9 p foo(1) Apply p foo(1) cmd to threads 2->7 & 9
	235	thread apply all p x/i $pc Apply x/i $pc cmd to all threads
	236	*/
	237
	238	static void
	239	thread_apply_all_command (cmd, from_tty)
	240	char *cmd;
	241	int from_tty;
	242	{
	243	struct thread_info *tp;
	244	struct cleanup *old_chain;
	245
	246	if (cmd == NULL \|\| *cmd == '\000')
	247	error ("Please specify a command following the thread ID list");
	248
	249	old_chain = make_cleanup (restore_current_thread, inferior_pid);
	250
	251	for (tp = thread_list; tp; tp = tp->next)
	252	{
	253	thread_switch (tp->pid);
	254	printf_filtered ("\nThread %d (%s):\n", tp->num,
	255	target_pid_to_str (inferior_pid));
	256	execute_command (cmd, from_tty);
	257	}
	258	}
	259
	260	static void
	261	thread_apply_command (tidlist, from_tty)
	262	char *tidlist;
	263	int from_tty;
	264	{
	265	char *cmd;
	266	char *p;
	267	struct cleanup *old_chain;
	268
	269	if (tidlist == NULL \|\| *tidlist == '\000')
	270	error ("Please specify a thread ID list");
	271
	272	for (cmd = tidlist; cmd != '\000' && !isalpha(cmd); cmd++);
	273
	274	if (*cmd == '\000')
	275	error ("Please specify a command following the thread ID list");
	276
	277	old_chain = make_cleanup (restore_current_thread, inferior_pid);
	278
	279	while (tidlist < cmd)
	280	{
	281	struct thread_info *tp;
	282	int start, end;
	283
	284	start = strtol (tidlist, &p, 10);
285	if (p == tidlist)
286	error ("Error parsing %s", tidlist);
287	tidlist = p;
288
289	while (tidlist == ' ' \|\| tidlist == '\t')
290	tidlist++;
291
292	if (tidlist == '-') / Got a range of IDs? */
293	{
294	tidlist++; /* Skip the - */
295	end = strtol (tidlist, &p, 10);
296	if (p == tidlist)
297	error ("Error parsing %s", tidlist);
298	tidlist = p;
299
300	while (tidlist == ' ' \|\| tidlist == '\t')
301	tidlist++;
302	}
303	else
304	end = start;
305
306	for (; start <= end; start++)
307	{
308	tp = find_thread_id (start);
309
310	if (!tp)
311	{
312	warning ("Unknown thread %d.", start);
313	continue;
314	}
315
316	thread_switch (tp->pid);
317	printf_filtered ("\nThread %d (%s):\n", tp->num,
318	target_pid_to_str (inferior_pid));
319	execute_command (cmd, from_tty);
320	}
321	}
322	}
323
324	/* Switch to the specified thread. Will dispatch off to thread_apply_command
325	if prefix of arg is `apply'. */
326
25286543 SG	327	static void
	328	thread_command (tidstr, from_tty)
	329	char *tidstr;
	330	int from_tty;
	331	{
	332	int num;
	333	struct thread_info *tp;
	334
	335	if (!tidstr)
	336	error ("Please specify a thread ID. Use the \"info threads\" command to\n\
	337	see the IDs of currently known threads.");
	338
25286543 SG	339	num = atoi (tidstr);
	340
	341	tp = find_thread_id (num);
	342
	343	if (!tp)
	344	error ("Thread ID %d not known. Use the \"info threads\" command to\n\
	345	see the IDs of currently known threads.", num);
	346
	347	thread_switch (tp->pid);
	348
	349	printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
	350	print_stack_frame (selected_frame, selected_frame_level, 1);
	351	}
	352
	353	void
	354	_initialize_thread ()
	355	{
5090e82c SG	356	static struct cmd_list_element *thread_cmd_list = NULL;
	357	static struct cmd_list_element *thread_apply_list = NULL;
	358	extern struct cmd_list_element *cmdlist;
	359
25286543 SG	360	add_info ("threads", info_threads_command,
25286543 SG	361	"IDs of currently known threads.");
5090e82c SG	362
	363	add_prefix_cmd ("thread", class_run, thread_command,
	364	"Use this command to switch between threads.\n\
	365	The new thread ID must be currently known.", &thread_cmd_list, "thread ", 1,
	366	&cmdlist);
	367
	368	add_prefix_cmd ("apply", class_run, thread_apply_command,
	369	"Apply a command to a list of threads.",
	370	&thread_apply_list, "apply ", 1, &thread_cmd_list);
	371
	372	add_cmd ("all", class_run, thread_apply_all_command,
	373	"Apply a command to all threads.",
	374	&thread_apply_list);
	375
	376	add_com_alias ("t", "thread", class_run, 1);
25286543	377	}