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Mon Apr 28 21:25:32 1997 Michael Snyder <msnyder@cleaver.cygnus.com> 

* Makefile.in: Add rule for gnu-nat.o and i386gnu-nat.o (Gnu Hurd)
        * config/i386/i386gnu.mh: remove rules for [i386]gnu-nat.o, now
        in Makefile.in (as for other targets); add NATDEPFILE corelow.o to
        satisfy symbol dependancy in solib.c (core_ops).
        * target.[ch] conditionalize Mach-specific signals so that they
        won't show up in non-Mach gdb's!
        * thread.c: add function thread_id_to_pid; change name of static
        function "thread_switch" to "switch_to_thread", to avoid conflict
        with Mach global symbol; move thread_cmd_list to global scope
        so targets can add their own thread commands.
        * infrun.c: sig_print_info: allow for long signal names.
        * gnu-nat.[ch]: tidying up comments.
        * gnu-nat.c: move several functions to static scope, just for tidy;
        remove calls to prune_threads and renumber_threads;
        gnu_wait must not return -1 when inferior exits;
        attach_to_child will modify inferior_pid in a way that allows
        fork_inferior to remain unchanged;
        remove extra arg from startup_inferior;
        move mach-specific thread commands here from thread.c.
This commit is contained in:
Michael Snyder 1997-04-29 04:27:26 +00:00
parent 75dc6b820f
commit c889a1eb87
3 changed files with 181 additions and 96 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

241
gdb/gnu-nat.c
View File

@ -85,43 +85,45 @@ int gnu_debug_flag = 0;
/* Forward decls */
extern struct target_ops gnu_ops;
extern char *strerror();
struct inf *make_inf ();
void inf_clear_wait (struct inf *inf);
void inf_cleanup (struct inf *inf);
void inf_startup (struct inf *inf, int pid, task_t task);
int inf_update_suspends (struct inf *inf);
void inf_set_task (struct inf *inf, task_t port);
void inf_validate_procs (struct inf *inf);
void inf_steal_exc_ports (struct inf *inf);
void inf_restore_exc_ports (struct inf *inf);
int inf_update_procs (struct inf *inf);
struct proc *inf_tid_to_proc (struct inf *inf, int tid);
inline void inf_set_threads_resume_sc (struct inf *inf, struct proc
*run_thread, int run_others);
inline int inf_set_threads_resume_sc_for_signal_thread (struct inf *inf);
inline void inf_suspend (struct inf *inf);
inline void inf_resume (struct inf *inf);
void inf_set_step_thread (struct inf *inf, struct proc *proc);
void inf_detach (struct inf *inf);
void inf_attach (struct inf *inf, int pid);
void inf_signal (struct inf *inf, enum target_signal sig);
static struct inf *make_inf ();
static void inf_clear_wait (struct inf *inf);
static void inf_cleanup (struct inf *inf);
static void inf_startup (struct inf *inf, int pid, task_t task);
static int inf_update_suspends (struct inf *inf);
static void inf_set_task (struct inf *inf, task_t port);
static void inf_validate_procs (struct inf *inf);
static void inf_steal_exc_ports (struct inf *inf);
static void inf_restore_exc_ports (struct inf *inf);
static struct proc *inf_tid_to_proc (struct inf *inf, int tid);
static inline void inf_set_threads_resume_sc (struct inf *inf,
struct proc *run_thread,
int run_others);
static inline int inf_set_threads_resume_sc_for_signal_thread (struct inf *inf);
static inline void inf_suspend (struct inf *inf);
static inline void inf_resume (struct inf *inf);
static void inf_set_step_thread (struct inf *inf, struct proc *proc);
static void inf_detach (struct inf *inf);
static void inf_attach (struct inf *inf, int pid);
static void inf_signal (struct inf *inf, enum target_signal sig);
#define inf_debug(_inf, msg, args...) \
do { struct inf *__inf = (_inf); \
debug ("{inf %d %p}: " msg, __inf->pid, __inf , ##args); } while (0)
struct proc *make_proc (struct inf *inf, mach_port_t port, int tid);
struct proc *_proc_free (struct proc *proc);
int proc_update_sc (struct proc *proc);
void proc_abort (struct proc *proc, int force);
thread_state_t proc_get_state (struct proc *proc, int force);
error_t proc_get_exception_port (struct proc *proc, mach_port_t *port);
error_t proc_set_exception_port (struct proc *proc, mach_port_t port);
static struct proc *make_proc (struct inf *inf, mach_port_t port, int tid);
static struct proc *_proc_free (struct proc *proc);
static int proc_update_sc (struct proc *proc);
static error_t proc_get_exception_port (struct proc *proc, mach_port_t *port);
static error_t proc_set_exception_port (struct proc *proc, mach_port_t port);
static mach_port_t _proc_get_exc_port (struct proc *proc);
void proc_steal_exc_port (struct proc *proc, mach_port_t exc_port);
void proc_restore_exc_port (struct proc *proc);
int proc_trace (struct proc *proc, int set);
static void proc_steal_exc_port (struct proc *proc, mach_port_t exc_port);
static void proc_restore_exc_port (struct proc *proc);
static int proc_trace (struct proc *proc, int set);
char *proc_string (struct proc *proc);
/* Evaluate RPC_EXPR in a scope with the variables MSGPORT and REFPORT bound
@ -238,6 +240,7 @@ struct inf
int want_exceptions;
};
int __proc_pid (struct proc *proc)
{
return proc->inf->pid;
@ -245,7 +248,7 @@ int __proc_pid (struct proc *proc)
/* Update PROC's real suspend count to match it's desired one. Returns true
if we think PROC is now in a runnable state. */
int
static int
proc_update_sc (struct proc *proc)
{
int running;
@ -374,7 +377,8 @@ proc_get_state (struct proc *proc, int will_modify)
return 0;
}
error_t
/* Set PORT to PROC's exception port. */
static error_t
proc_get_exception_port (struct proc *proc, mach_port_t *port)
{
if (proc_is_task (proc))
@ -383,7 +387,8 @@ proc_get_exception_port (struct proc *proc, mach_port_t *port)
return thread_get_exception_port (proc->port, port);
}
error_t
/* Set PROC's exception port to PORT. */
static error_t
proc_set_exception_port (struct proc *proc, mach_port_t port)
{
proc_debug (proc, "setting exception port: %d", port);
@ -416,7 +421,7 @@ _proc_get_exc_port (struct proc *proc)
/* Replace PROC's exception port with EXC_PORT, unless it's already been
done. Stash away any existing exception port so we can restore it later. */
void
static void
proc_steal_exc_port (struct proc *proc, mach_port_t exc_port)
{
mach_port_t cur_exc_port = _proc_get_exc_port (proc);
@ -456,10 +461,10 @@ proc_steal_exc_port (struct proc *proc, mach_port_t exc_port)
}
}
/* If we previously replaced PROC's exception port, put back what we found
there at the time, unless *our* exception port has since be overwritten,
in which case who knows what's going on. */
void
/* If we previously replaced PROC's exception port, put back what we
found there at the time, unless *our* exception port has since been
overwritten, in which case who knows what's going on. */
static void
proc_restore_exc_port (struct proc *proc)
{
mach_port_t cur_exc_port = _proc_get_exc_port (proc);
@ -486,9 +491,9 @@ proc_restore_exc_port (struct proc *proc)
}
}
/* Turns hardware tracing in PROC on or off when SET is true or fals,
/* Turns hardware tracing in PROC on or off when SET is true or false,
respectively. Returns true on success. */
int
static int
proc_trace (struct proc *proc, int set)
{
thread_state_t state = proc_get_state (proc, 1);
@ -576,9 +581,9 @@ make_proc (struct inf *inf, mach_port_t port, int tid)
return proc;
}
/* Frees PROC and any resources it uses, and returns the value of PROC's next
field. */
struct proc *
/* Frees PROC and any resources it uses, and returns the value of PROC's
next field. */
static struct proc *
_proc_free (struct proc *proc)
{
struct inf *inf = proc->inf;
@ -646,7 +651,8 @@ struct inf *make_inf ()
return inf;
}
void
/* clear INF's target wait status. */
static void
inf_clear_wait (struct inf *inf)
{
inf_debug (inf, "clearing wait");
@ -665,7 +671,7 @@ inf_clear_wait (struct inf *inf)
}
}
void
static void
inf_cleanup (struct inf *inf)
{
inf_debug (inf, "cleanup");
@ -687,7 +693,7 @@ inf_cleanup (struct inf *inf)
}
}
void
static void
inf_startup (struct inf *inf, int pid, task_t task)
{
error_t err;
@ -719,7 +725,8 @@ inf_startup (struct inf *inf, int pid, task_t task)
}
}
void
/* close current process, if any, and attach INF to process PORT */
static void
inf_set_task (struct inf *inf, mach_port_t port)
{
struct proc *task = inf->task;
@ -794,7 +801,7 @@ inf_validate_task_sc (struct inf *inf)
/* Turns tracing for INF on or off, depending on ON, unless it already is.
If INF is running, the resume_sc count of INF's threads will be modified,
and the signal thread will briefly be run to change the trace state. */
void
static void
inf_set_traced (struct inf *inf, int on)
{
if (on != inf->traced)
@ -825,7 +832,7 @@ inf_set_traced (struct inf *inf, int on)
/* Makes all the real suspend count deltas of all the procs in INF match the
desired values. Careful to always do thread/task suspend counts in the
safe order. Returns true if at least one thread is thought to be running.*/
int
static int
inf_update_suspends (struct inf *inf)
{
struct proc *task = inf->task;
@ -879,6 +886,8 @@ struct proc *
inf_tid_to_thread (struct inf *inf, int tid)
{
struct proc *thread = inf->threads;
if (tid == inf->pid) /* main thread */
return thread;
while (thread)
if (thread->tid == tid)
return thread;
@ -888,7 +897,7 @@ inf_tid_to_thread (struct inf *inf, int tid)
}
/* Converts a thread port to a struct proc. */
struct proc *
static struct proc *
inf_port_to_thread (struct inf *inf, mach_port_t port)
{
struct proc *thread = inf->threads;
@ -901,7 +910,7 @@ inf_port_to_thread (struct inf *inf, mach_port_t port)
}
/* Make INF's list of threads be consistent with reality of TASK. */
void
static void
inf_validate_procs (struct inf *inf)
{
int i;
@ -979,11 +988,23 @@ inf_validate_procs (struct inf *inf)
else
/* THREADS[I] is a thread we don't know about yet! */
{
#if 0
thread = make_proc (inf, threads[i], next_thread_id++);
#else
thread = make_proc (inf, threads[i], threads[i]);
#endif
(last ? last->next : inf->threads) = thread;
last = thread;
proc_debug (thread, "new thread: %d", threads[i]);
#if 1 /* try leaving this out, see what happens */
add_thread (thread->tid); /* Tell GDB's generic thread code. */
#if 0 /* seems to cause kernel exceptions??? */
target_terminal_ours_for_output (); /* allow debugger I/O */
printf_filtered ("[gnu-nat: New %s]\n",
target_pid_to_str (thread->tid));
target_terminal_inferior (); /* give it back */
#endif
#endif
}
vm_deallocate(mach_task_self(),
@ -1005,7 +1026,7 @@ inf_update_procs (struct inf *inf)
/* Sets the resume_sc of each thread in inf. That of RUN_THREAD is set to 0,
and others are set to their run_sc if RUN_OTHERS is true, and otherwise
their pause_sc. */
inline void
static inline void
inf_set_threads_resume_sc (struct inf *inf,
struct proc *run_thread, int run_others)
{
@ -1022,7 +1043,7 @@ inf_set_threads_resume_sc (struct inf *inf,
/* Cause INF to continue execution immediately; individual threads may still
be suspended (but their suspend counts will be updated). */
inline void
static inline void
inf_resume (struct inf *inf)
{
struct proc *thread;
@ -1047,7 +1068,7 @@ inf_resume (struct inf *inf)
/* Cause INF to stop execution immediately; individual threads may still
be running. */
inline void
static inline void
inf_suspend (struct inf *inf)
{
struct proc *thread;
@ -1063,10 +1084,10 @@ inf_suspend (struct inf *inf)
inf_update_suspends (inf);
}
/* INF has one thread PROC that is in single-stepping mode. This functions
/* INF has one thread PROC that is in single-stepping mode. This function
changes it to be PROC, changing any old step_thread to be a normal one. A
PROC of 0 clears an any existing value. */
void
PROC of 0 clears any existing value. */
static void
inf_set_step_thread (struct inf *inf, struct proc *thread)
{
assert (!thread || proc_is_thread (thread));
@ -1091,7 +1112,7 @@ inf_set_step_thread (struct inf *inf, struct proc *thread)
/* Set up the thread resume_sc's so that only the signal thread is running
(plus whatever other thread are set to always run). Returns true if we
did so, or false if we can't find a signal thread. */
inline int
static inline int
inf_set_threads_resume_sc_for_signal_thread (struct inf *inf)
{
if (inf->signal_thread)
@ -1112,7 +1133,7 @@ inf_update_signal_thread (struct inf *inf)
}
/* Detachs from INF's inferior task, letting it run once again... */
void
static void
inf_detach (struct inf *inf)
{
struct proc *task = inf->task;
@ -1147,7 +1168,7 @@ inf_detach (struct inf *inf)
/* Attaches INF to the process with process id PID, returning it in a suspended
state suitable for debugging. */
void
static void
inf_attach (struct inf *inf, int pid)
{
error_t err;
@ -1196,7 +1217,7 @@ void inf_restore_exc_ports (struct inf *inf)
/* Deliver signal SIG to INF. If INF is stopped, delivering a signal, even
signal 0, will continue it. INF is assumed to be in a paused state, and
the resume_sc's of INF's threads may be affected. */
void
static void
inf_signal (struct inf *inf, enum target_signal sig)
{
error_t err = 0;
@ -1237,7 +1258,7 @@ inf_signal (struct inf *inf, enum target_signal sig)
else
/* A Unix signal. */
if (inf->stopped)
/* The process is stopped an expecting a signal. Just send off a
/* The process is stopped and expecting a signal. Just send off a
request and let it get handled when we resume everything. */
{
inf_debug (inf, "sending %s to stopped process", NAME);
@ -1404,12 +1425,14 @@ gnu_wait (int tid, struct target_waitstatus *status)
/* Ah hah! A SIGTRAP from the inferior while starting up probably
means we've succesfully completed an exec! */
{
#if 0 /* do we need this? */
if (--inf->pending_execs == 0)
/* We're done! */
{
prune_threads (1); /* Get rid of the old shell threads */
renumber_threads (0); /* Give our threads reasonable names. */
}
#endif
inf_debug (inf, "pending exec completed, pending_execs => %d",
inf->pending_execs);
}
@ -1438,7 +1461,7 @@ gnu_wait (int tid, struct target_waitstatus *status)
if (inf_update_procs (inf) && inf->threads)
tid = inf->threads->tid; /* The first available thread. */
else
tid = -1;
tid = inferior_pid; /* let wait_for_inferior handle exit case */
if (thread && tid >= 0 && status->kind != TARGET_WAITKIND_SPURIOUS
&& inf->pause_sc == 0 && thread->pause_sc == 0)
@ -1546,7 +1569,7 @@ S_exception_raise_request (mach_port_t port, mach_port_t reply_port,
/* Fill in INF's wait field after a task has died without giving us more
detailed information. */
void
static void
inf_task_died_status (struct inf *inf)
{
warning ("Pid %d died with unknown exit status, using SIGKILL.", inf->pid);
@ -1849,15 +1872,15 @@ gnu_mourn_inferior ()
/* Fork an inferior process, and start debugging it. */
/* Set INFERIOR_PID to the first thread available in the child, if any. */
static void
pick_first_thread ()
static int
inf_pick_first_thread ()
{
if (current_inferior->task && current_inferior->threads)
/* The first thread. */
inferior_pid = current_inferior->threads->tid;
return current_inferior->threads->tid;
else
/* What may be the next thread. */
inferior_pid = next_thread_id;
return next_thread_id;
}
static struct inf *
@ -1889,7 +1912,6 @@ gnu_create_inferior (exec_file, allargs, env)
inf_debug (inf, "attaching to child: %d", pid);
inf_attach (inf, pid);
pick_first_thread ();
attach_flag = 0;
push_target (&gnu_ops);
@ -1900,10 +1922,11 @@ gnu_create_inferior (exec_file, allargs, env)
/* Now let the child run again, knowing that it will stop immediately
because of the ptrace. */
inf_resume (inf);
inferior_pid = inf_pick_first_thread ();
startup_inferior (pid, inf->pending_execs);
startup_inferior (inf->pending_execs);
return pid;
return inferior_pid;
}
inf_debug (inf, "creating inferior");
@ -1971,7 +1994,7 @@ gnu_attach (args, from_tty)
inf_attach (inf, pid);
inf_update_procs (inf);
pick_first_thread ();
inferior_pid = inf_pick_first_thread ();
attach_flag = 1;
push_target (&gnu_ops);
@ -1983,7 +2006,11 @@ gnu_attach (args, from_tty)
time the user does a continue. */
inf_validate_stopped (inf);
#if 0 /* Do we need this? Actually I can see where it
might be helpful here, but it's just cosmetic.
Let's come back to it later. XXX Fix me. */
renumber_threads (0); /* Give our threads reasonable names. */
#endif
}
/* Take a program previously attached to and detaches it.
@ -2111,8 +2138,8 @@ struct vm_region_list {
struct obstack region_obstack;
/*
* Write inferior task's LEN bytes from ADDR and copy it to MYADDR
* in gdb's address space.
* Write gdb's LEN bytes from MYADDR and copy it to ADDR
* in inferior task's address space.
*/
int
gnu_write_inferior (task, addr, myaddr, length)
@ -2354,6 +2381,7 @@ struct target_ops gnu_ops = {
OPS_MAGIC /* to_magic */
};
/* Return printable description of proc. */
char *proc_string (struct proc *proc)
{
static char tid_str[80];
@ -2362,7 +2390,12 @@ char *proc_string (struct proc *proc)
else
sprintf (tid_str, "thread %d.%d",
proc->inf->pid,
pid_to_thread_id (proc->tid));
#if 0
pid_to_thread_id (proc->tid)
#else
proc->tid
#endif
);
return tid_str;
}
@ -2386,9 +2419,41 @@ gnu_target_pid_to_str (int tid)
struct cmd_list_element *set_task_cmd_list = 0;
struct cmd_list_element *show_task_cmd_list = 0;
/* User thread commands. */
extern struct cmd_list_element *set_thread_default_cmd_list;
extern struct cmd_list_element *show_thread_default_cmd_list;
/* Commands with a prefix of `set/show thread'. */
extern struct cmd_list_element *thread_cmd_list;
struct cmd_list_element *set_thread_cmd_list = NULL;
struct cmd_list_element *show_thread_cmd_list = NULL;
/* Commands with a prefix of `set/show thread default'. */
struct cmd_list_element *set_thread_default_cmd_list = NULL;
struct cmd_list_element *show_thread_default_cmd_list = NULL;
static void
set_thread_cmd (char *args, int from_tty)
{
printf_unfiltered ("\"set thread\" must be followed by the name of a thread
property, or \"default\".\n");
}
static void
show_thread_cmd (char *args, int from_tty)
{
printf_unfiltered ("\"show thread\" must be followed by the name of a thread property, or \"default\".\n");
}
static void
set_thread_default_cmd (char *args, int from_tty)
{
printf_unfiltered ("\"set thread default\" must be followed by the name of a thread property.\n");
}
static void
show_thread_default_cmd (char *args, int from_tty)
{
printf_unfiltered ("\"show thread default\" must be followed by the name of a thread property.\n");
}
static int
parse_int_arg (char *args, char *cmd_prefix)
@ -2905,11 +2970,6 @@ them).",
add_info_alias ("psets", "port-sets", 1);
}
/* User thread commands. */
extern struct cmd_list_element *set_thread_cmd_list;
extern struct cmd_list_element *show_thread_cmd_list;
extern struct cmd_list_element *thread_cmd_list;
static void
set_thread_pause_cmd (char *args, int from_tty)
@ -2977,12 +3037,7 @@ set_thread_exc_port_cmd (char *args, int from_tty)
steal_exc_port (thread, parse_and_eval_address (args));
}
static void
set_thread_cmd (char *args, int from_tty)
{
printf_unfiltered ("\"set thread\" must be followed by the name of a thread property.\n");
}
#if 0
static void
show_thread_cmd (char *args, int from_tty)
{
@ -2993,6 +3048,7 @@ show_thread_cmd (char *args, int from_tty)
if (thread->detach_sc != 0)
show_thread_detach_sc_cmd (0, from_tty);
}
#endif
static void
thread_takeover_sc_cmd (char *args, int from_tty)
@ -3014,6 +3070,21 @@ thread_takeover_sc_cmd (char *args, int from_tty)
add_thread_commands ()
{
add_prefix_cmd ("thread", no_class, set_thread_cmd,
"Command prefix for setting thread properties.",
&set_thread_cmd_list, "set thread ", 0, &setlist);
add_prefix_cmd ("default", no_class, show_thread_cmd,
"Command prefix for setting default thread properties.",
&set_thread_default_cmd_list, "set thread default ", 0,
&set_thread_cmd_list);
add_prefix_cmd ("thread", no_class, set_thread_default_cmd,
"Command prefix for showing thread properties.",
&show_thread_cmd_list, "show thread ", 0, &showlist);
add_prefix_cmd ("default", no_class, show_thread_default_cmd,
"Command prefix for showing default thread properties.",
&show_thread_default_cmd_list, "show thread default ", 0,
&show_thread_cmd_list);
add_cmd ("pause", class_run, set_thread_pause_cmd,
"Set whether the current thread is suspended while gdb has control.\n"
"A value of \"on\" takes effect immediately, otherwise nothing\n"

5
gdb/gnu-nat.h
View File

@ -46,8 +46,9 @@ struct proc
int cur_sc; /* Implemented suspend count. */
int run_sc; /* Default sc when the program is running. */
int pause_sc; /* Default sc when gdb has control. */
int resume_sc; /* Sc resulting form the last resume. */
int detach_sc; /* SC to leave around when detaching from program. */
int resume_sc; /* Sc resulting from the last resume. */
int detach_sc; /* SC to leave around when detaching
from program. */
thread_state_data_t state; /* Registers, &c. */
int state_valid : 1; /* True if STATE is up to date. */

31
gdb/thread.c
View File

@ -65,7 +65,7 @@ static void
prune_threads PARAMS ((void));
static void
thread_switch PARAMS ((int pid));
switch_to_thread PARAMS ((int pid));
static struct thread_info *
find_thread_id PARAMS ((int num));
@ -164,6 +164,17 @@ pid_to_thread_id (pid)
return 0;
}
int
thread_id_to_pid (num)
int num;
{
struct thread_info *thread = find_thread_id (num);
if (thread)
return thread->pid;
else
return -1;
}
int
in_thread_list (pid)
int pid;
@ -309,18 +320,18 @@ info_threads_command (arg, from_tty)
printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
thread_switch (tp->pid);
switch_to_thread (tp->pid);
print_stack_frame (selected_frame, -1, 0);
}
thread_switch (current_pid);
switch_to_thread (current_pid);
prune_threads ();
}
/* Switch from one thread to another. */
static void
thread_switch (pid)
switch_to_thread (pid)
int pid;
{
if (pid == inferior_pid)
@ -338,7 +349,7 @@ restore_current_thread (pid)
int pid;
{
if (pid != inferior_pid)
thread_switch (pid);
switch_to_thread (pid);
}
/* Apply a GDB command to a list of threads. List syntax is a whitespace
@ -365,7 +376,7 @@ thread_apply_all_command (cmd, from_tty)
for (tp = thread_list; tp; tp = tp->next)
{
thread_switch (tp->pid);
switch_to_thread (tp->pid);
printf_filtered ("\nThread %d (%s):\n", tp->num,
target_pid_to_str (inferior_pid));
execute_command (cmd, from_tty);
@ -428,7 +439,7 @@ thread_apply_command (tidlist, from_tty)
continue;
}
thread_switch (tp->pid);
switch_to_thread (tp->pid);
printf_filtered ("\nThread %d (%s):\n", tp->num,
target_pid_to_str (inferior_pid));
execute_command (cmd, from_tty);
@ -459,16 +470,18 @@ see the IDs of currently known threads.");
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);
switch_to_thread (tp->pid);
printf_filtered ("[Switching to %s]\n", target_pid_to_str (inferior_pid));
print_stack_frame (selected_frame, selected_frame_level, 1);
}
/* Commands with a prefix of `thread'. */
struct cmd_list_element *thread_cmd_list = NULL;
void
_initialize_thread ()
{
static struct cmd_list_element *thread_cmd_list = NULL;
static struct cmd_list_element *thread_apply_list = NULL;
extern struct cmd_list_element *cmdlist;