/* Multi-process/thread control for GDB, the GNU debugger.
- Copyright 1986, 1987, 1988, 1993, 1998
-
- Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
+ Copyright 1986, 1987, 1988, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ 2000, 2001
Free Software Foundation, Inc.
+ 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
-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 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.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "symtab.h"
#include "gdbthread.h"
#include "command.h"
#include "gdbcmd.h"
+#include "regcache.h"
#include <ctype.h>
#include <sys/types.h>
#include <signal.h>
+#ifdef UI_OUT
+#include "ui-out.h"
+#endif
-/*#include "lynxos-core.h"*/
-
-struct thread_info
-{
- struct thread_info *next;
- int pid; /* Actual process id */
- int num; /* Convenient handle */
- CORE_ADDR prev_pc; /* State from wait_for_inferior */
- CORE_ADDR prev_func_start;
- char *prev_func_name;
- struct breakpoint *step_resume_breakpoint;
- struct breakpoint *through_sigtramp_breakpoint;
- CORE_ADDR step_range_start;
- CORE_ADDR step_range_end;
- CORE_ADDR step_frame_address;
- int trap_expected;
- int handling_longjmp;
- int another_trap;
-
- /* This is set TRUE when a catchpoint of a shared library event
- triggers. Since we don't wish to leave the inferior in the
- solib hook when we report the event, we step the inferior
- back to user code before stopping and reporting the event.
- */
- int stepping_through_solib_after_catch;
-
- /* When stepping_through_solib_after_catch is TRUE, this is a
- list of the catchpoints that should be reported as triggering
- when we finally do stop stepping.
- */
- bpstat stepping_through_solib_catchpoints;
-
- /* This is set to TRUE when this thread is in a signal handler
- trampoline and we're single-stepping through it */
- int stepping_through_sigtramp;
+/*#include "lynxos-core.h" */
-};
+/* Definition of struct thread_info exported to gdbthread.h */
/* Prototypes for exported functions. */
-void _initialize_thread PARAMS ((void));
+void _initialize_thread (void);
/* Prototypes for local functions. */
-#if !defined(FIND_NEW_THREADS)
-#define FIND_NEW_THREADS target_find_new_threads
-#endif
-
static struct thread_info *thread_list = NULL;
static int highest_thread_num;
-static struct thread_info * find_thread_id PARAMS ((int num));
-
-static void thread_command PARAMS ((char * tidstr, int from_tty));
-static void thread_apply_all_command PARAMS ((char *, int));
-static int thread_alive PARAMS ((struct thread_info *));
-static void info_threads_command PARAMS ((char *, int));
-static void thread_apply_command PARAMS ((char *, int));
-static void restore_current_thread PARAMS ((int));
-static void switch_to_thread PARAMS ((int pid));
-static void prune_threads PARAMS ((void));
+static struct thread_info *find_thread_id (int num);
-/* If the host has threads, the host machine definition may set this
- macro. But, for remote thread debugging, it gets more complex and
- setting macros does not bind to the various target dependent
- methods well. So, we use the vector target_thread_functions */
-
-static struct target_thread_vector *target_thread_functions;
-
-int
-target_find_new_threads ()
-{
- int retval = 0;
- if (target_thread_functions &&
- target_thread_functions->find_new_threads)
- retval = (*(target_thread_functions->find_new_threads)) ();
- return retval; /* no support */
-}
-
-
-int
-target_get_thread_info PARAMS ((gdb_threadref * ref,
- int selection, /* FIXME: Selection */
- struct gdb_ext_thread_info * info));
-
-int
-target_get_thread_info (ref, selection, info)
-
- gdb_threadref *ref;
- int selection;
- /* FIXME: Selection */
- struct gdb_ext_thread_info *info;
+static void thread_command (char *tidstr, int from_tty);
+static void thread_apply_all_command (char *, int);
+static int thread_alive (struct thread_info *);
+static void info_threads_command (char *, int);
+static void thread_apply_command (char *, int);
+static void restore_current_thread (int);
+static void switch_to_thread (int pid);
+static void prune_threads (void);
+static void
+free_thread (struct thread_info *tp)
{
- int retval = 0;
- if (target_thread_functions
- && target_thread_functions->get_thread_info)
- retval = (*(target_thread_functions->get_thread_info)) (ref, selection, info);
- return retval;
-}
-
-
-/* It is possible that these bind and unbinf functions implement a
- stack the interface allows it, but its not implemented that way
- */
+ /* NOTE: this will take care of any left-over step_resume breakpoints,
+ but not any user-specified thread-specific breakpoints. */
+ if (tp->step_resume_breakpoint)
+ delete_breakpoint (tp->step_resume_breakpoint);
+ /* FIXME: do I ever need to call the back-end to give it a
+ chance at this private data before deleting the thread? */
+ if (tp->private)
+ xfree (tp->private);
-void
-bind_target_thread_vector (vec)
- struct target_thread_vector *vec;
-{
- target_thread_functions = vec;
+ xfree (tp);
}
-struct target_thread_vector *
-unbind_target_thread_vector ()
-{
- struct target_thread_vector *retval;
- retval = target_thread_functions;
- target_thread_functions = 0;
- return retval;
-} /* unbind_target_thread-vector */
-
void
-init_thread_list ()
+init_thread_list (void)
{
struct thread_info *tp, *tpnext;
+ highest_thread_num = 0;
if (!thread_list)
return;
for (tp = thread_list; tp; tp = tpnext)
{
tpnext = tp->next;
- free (tp);
+ free_thread (tp);
}
thread_list = NULL;
- highest_thread_num = 0;
}
-void
-add_thread (pid)
- int pid;
+/* add_thread now returns a pointer to the new thread_info,
+ so that back_ends can initialize their private data. */
+
+struct thread_info *
+add_thread (int pid)
{
struct thread_info *tp;
tp->prev_func_name = NULL;
tp->step_range_start = 0;
tp->step_range_end = 0;
- tp->step_frame_address =0;
+ tp->step_frame_address = 0;
tp->step_resume_breakpoint = 0;
tp->through_sigtramp_breakpoint = 0;
tp->handling_longjmp = 0;
tp->stepping_through_solib_catchpoints = NULL;
tp->stepping_through_sigtramp = 0;
tp->next = thread_list;
+ tp->private = NULL;
thread_list = tp;
+ return tp;
}
void
-delete_thread (pid)
- int pid;
+delete_thread (int pid)
{
struct thread_info *tp, *tpprev;
else
thread_list = tp->next;
- free (tp);
-
- return;
+ free_thread (tp);
}
static struct thread_info *
-find_thread_id (num)
- int num;
+find_thread_id (int num)
{
struct thread_info *tp;
return NULL;
}
+/* Find a thread_info by matching 'pid'. */
+struct thread_info *
+find_thread_pid (int pid)
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if (tp->pid == pid)
+ return tp;
+
+ return NULL;
+}
+
+/*
+ * Thread iterator function.
+ *
+ * Calls a callback function once for each thread, so long as
+ * the callback function returns false. If the callback function
+ * returns true, the iteration will end and the current thread
+ * will be returned. This can be useful for implementing a
+ * search for a thread with arbitrary attributes, or for applying
+ * some operation to every thread.
+ *
+ * FIXME: some of the existing functionality, such as
+ * "Thread apply all", might be rewritten using this functionality.
+ */
+
+struct thread_info *
+iterate_over_threads (int (*callback) (struct thread_info *, void *),
+ void *data)
+{
+ struct thread_info *tp;
+
+ for (tp = thread_list; tp; tp = tp->next)
+ if ((*callback) (tp, data))
+ return tp;
+
+ return NULL;
+}
+
int
-valid_thread_id (num)
- int num;
+valid_thread_id (int num)
{
struct thread_info *tp;
}
int
-pid_to_thread_id (pid)
- int pid;
+pid_to_thread_id (int pid)
{
struct thread_info *tp;
}
int
-thread_id_to_pid (num)
- int num;
+thread_id_to_pid (int num)
{
struct thread_info *thread = find_thread_id (num);
if (thread)
}
int
-in_thread_list (pid)
- int pid;
+in_thread_list (int pid)
{
struct thread_info *tp;
return 0; /* Never heard of 'im */
}
+#ifdef UI_OUT
+/* Print a list of thread ids currently known, and the total number of
+ threads. To be used from within catch_errors. */
+static int
+do_captured_list_thread_ids (void *arg)
+{
+ struct thread_info *tp;
+ int num = 0;
+
+ ui_out_list_begin (uiout, "thread-ids");
+
+ for (tp = thread_list; tp; tp = tp->next)
+ {
+ num++;
+ ui_out_field_int (uiout, "thread-id", tp->num);
+ }
+
+ ui_out_list_end (uiout);
+ ui_out_field_int (uiout, "number-of-threads", num);
+ return GDB_RC_OK;
+}
+
+/* Official gdblib interface function to get a list of thread ids and
+ the total number. */
+enum gdb_rc
+gdb_list_thread_ids (/* output object */)
+{
+ return catch_errors (do_captured_list_thread_ids, NULL,
+ NULL, RETURN_MASK_ALL);
+}
+#endif
/* Load infrun state for the thread PID. */
-void load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
- trap_expected, step_resume_breakpoint,
- through_sigtramp_breakpoint, step_range_start,
- step_range_end, step_frame_address,
- handling_longjmp, another_trap,
- stepping_through_solib_after_catch,
- stepping_through_solib_catchpoints,
- stepping_through_sigtramp)
- int pid;
- CORE_ADDR *prev_pc;
- CORE_ADDR *prev_func_start;
- char **prev_func_name;
- int *trap_expected;
- struct breakpoint **step_resume_breakpoint;
- struct breakpoint **through_sigtramp_breakpoint;
- CORE_ADDR *step_range_start;
- CORE_ADDR *step_range_end;
- CORE_ADDR *step_frame_address;
- int *handling_longjmp;
- int *another_trap;
- int * stepping_through_solib_after_catch;
- bpstat * stepping_through_solib_catchpoints;
- int * stepping_through_sigtramp;
+void
+load_infrun_state (int pid, CORE_ADDR *prev_pc, CORE_ADDR *prev_func_start,
+ char **prev_func_name, int *trap_expected,
+ struct breakpoint **step_resume_breakpoint,
+ struct breakpoint **through_sigtramp_breakpoint,
+ CORE_ADDR *step_range_start, CORE_ADDR *step_range_end,
+ CORE_ADDR *step_frame_address, int *handling_longjmp,
+ int *another_trap, int *stepping_through_solib_after_catch,
+ bpstat *stepping_through_solib_catchpoints,
+ int *stepping_through_sigtramp)
{
struct thread_info *tp;
/* Save infrun state for the thread PID. */
-void save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
- trap_expected, step_resume_breakpoint,
- through_sigtramp_breakpoint, step_range_start,
- step_range_end, step_frame_address,
- handling_longjmp, another_trap,
- stepping_through_solib_after_catch,
- stepping_through_solib_catchpoints,
- stepping_through_sigtramp)
- int pid;
- CORE_ADDR prev_pc;
- CORE_ADDR prev_func_start;
- char *prev_func_name;
- int trap_expected;
- struct breakpoint *step_resume_breakpoint;
- struct breakpoint *through_sigtramp_breakpoint;
- CORE_ADDR step_range_start;
- CORE_ADDR step_range_end;
- CORE_ADDR step_frame_address;
- int handling_longjmp;
- int another_trap;
- int stepping_through_solib_after_catch;
- bpstat stepping_through_solib_catchpoints;
- int stepping_through_sigtramp;
+void
+save_infrun_state (int pid, CORE_ADDR prev_pc, CORE_ADDR prev_func_start,
+ char *prev_func_name, int trap_expected,
+ struct breakpoint *step_resume_breakpoint,
+ struct breakpoint *through_sigtramp_breakpoint,
+ CORE_ADDR step_range_start, CORE_ADDR step_range_end,
+ CORE_ADDR step_frame_address, int handling_longjmp,
+ int another_trap, int stepping_through_solib_after_catch,
+ bpstat stepping_through_solib_catchpoints,
+ int stepping_through_sigtramp)
{
struct thread_info *tp;
/* Return true if TP is an active thread. */
static int
-thread_alive (tp)
- struct thread_info *tp;
+thread_alive (struct thread_info *tp)
{
if (tp->pid == -1)
return 0;
- if (! target_thread_alive (tp->pid))
+ if (!target_thread_alive (tp->pid))
{
- tp->pid = -1; /* Mark it as dead */
+ tp->pid = -1; /* Mark it as dead */
return 0;
}
return 1;
}
static void
-prune_threads ()
+prune_threads (void)
{
- struct thread_info *tp, *tpprev, *next;
+ struct thread_info *tp, *next;
- tpprev = 0;
for (tp = thread_list; tp; tp = next)
{
next = tp->next;
if (!thread_alive (tp))
- {
- if (tpprev)
- tpprev->next = next;
- else
- thread_list = next;
- free (tp);
- }
- else
- tpprev = tp;
+ delete_thread (tp->pid);
}
}
/* Print information about currently known threads
- *
+
* Note: this has the drawback that it _really_ switches
* threads, which frees the frame cache. A no-side
* effects info-threads command would be nicer.
*/
static void
-info_threads_command (arg, from_tty)
- char *arg;
- int from_tty;
+info_threads_command (char *arg, int from_tty)
{
struct thread_info *tp;
- int current_pid;
- struct frame_info *cur_frame;
- int saved_frame_level = selected_frame_level;
- int counter;
+ int current_pid;
+ struct frame_info *cur_frame;
+ int saved_frame_level = selected_frame_level;
+ int counter;
+ char *extra_info;
/* Avoid coredumps which would happen if we tried to access a NULL
selected_frame. */
- if (!target_has_stack) error ("No stack.");
+ if (!target_has_stack)
+ error ("No stack.");
prune_threads ();
-#if defined(FIND_NEW_THREADS)
- FIND_NEW_THREADS ();
-#endif
+ target_find_new_threads ();
current_pid = inferior_pid;
for (tp = thread_list; tp; tp = tp->next)
{
printf_filtered (" ");
#ifdef HPUXHPPA
- printf_filtered ("%d %s ", tp->num, target_tid_to_str (tp->pid));
+ printf_filtered ("%d %s", tp->num, target_tid_to_str (tp->pid));
#else
- printf_filtered ("%d %s ", tp->num, target_pid_to_str (tp->pid));
+ printf_filtered ("%d %s", tp->num, target_pid_to_str (tp->pid));
#endif
+
+ extra_info = target_extra_thread_info (tp);
+ if (extra_info)
+ printf_filtered (" (%s)", extra_info);
+ puts_filtered (" ");
+
switch_to_thread (tp->pid);
if (selected_frame)
print_only_stack_frame (selected_frame, -1, 0);
* back to the current thread. That switch has put us at the top
* of the stack (leaf frame).
*/
- counter = saved_frame_level;
- cur_frame = find_relative_frame(selected_frame, &counter);
+ counter = saved_frame_level;
+ cur_frame = find_relative_frame (selected_frame, &counter);
if (counter != 0)
{
/* Ooops, can't restore, tell user where we are. */
}
else
{
- select_frame(cur_frame, saved_frame_level);
+ select_frame (cur_frame, saved_frame_level);
}
/* re-show current frame. */
- show_stack_frame(cur_frame);
+ show_stack_frame (cur_frame);
}
/* Switch from one thread to another. */
static void
-switch_to_thread (pid)
- int pid;
+switch_to_thread (int pid)
{
if (pid == inferior_pid)
return;
inferior_pid = pid;
flush_cached_frames ();
registers_changed ();
- stop_pc = read_pc();
+ stop_pc = read_pc ();
select_frame (get_current_frame (), 0);
}
static void
-restore_current_thread (pid)
- int pid;
+restore_current_thread (int pid)
{
- if (pid != inferior_pid)
+ if (pid != inferior_pid)
{
switch_to_thread (pid);
- print_stack_frame( get_current_frame(), 0, -1);
+ print_stack_frame (get_current_frame (), 0, -1);
}
}
+struct current_thread_cleanup
+{
+ int inferior_pid;
+};
+
+static void
+do_restore_current_thread_cleanup (void *arg)
+{
+ struct current_thread_cleanup *old = arg;
+ restore_current_thread (old->inferior_pid);
+ xfree (old);
+}
+
+static struct cleanup *
+make_cleanup_restore_current_thread (int inferior_pid)
+{
+ struct current_thread_cleanup *old
+ = xmalloc (sizeof (struct current_thread_cleanup));
+ old->inferior_pid = inferior_pid;
+ return make_cleanup (do_restore_current_thread_cleanup, old);
+}
+
/* 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
-*/
+ 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;
+thread_apply_all_command (char *cmd, int from_tty)
{
struct thread_info *tp;
struct cleanup *old_chain;
+ struct cleanup *saved_cmd_cleanup_chain;
+ char *saved_cmd;
if (cmd == NULL || *cmd == '\000')
error ("Please specify a command following the thread ID list");
- old_chain = make_cleanup ((make_cleanup_func) restore_current_thread,
- (void *) inferior_pid);
+ old_chain = make_cleanup_restore_current_thread (inferior_pid);
+ /* It is safe to update the thread list now, before
+ traversing it for "thread apply all". MVS */
+ target_find_new_threads ();
+
+ /* Save a copy of the command in case it is clobbered by
+ execute_command */
+ saved_cmd = xstrdup (cmd);
+ saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
for (tp = thread_list; tp; tp = tp->next)
if (thread_alive (tp))
{
target_pid_to_str (inferior_pid));
#endif
execute_command (cmd, from_tty);
+ strcpy (cmd, saved_cmd); /* Restore exact command used previously */
}
+
+ do_cleanups (saved_cmd_cleanup_chain);
+ do_cleanups (old_chain);
}
static void
-thread_apply_command (tidlist, from_tty)
- char *tidlist;
- int from_tty;
+thread_apply_command (char *tidlist, int from_tty)
{
char *cmd;
char *p;
struct cleanup *old_chain;
+ struct cleanup *saved_cmd_cleanup_chain;
+ char *saved_cmd;
if (tidlist == NULL || *tidlist == '\000')
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')
error ("Please specify a command following the thread ID list");
- old_chain = make_cleanup ((make_cleanup_func) restore_current_thread,
- (void *) inferior_pid);
+ old_chain = make_cleanup_restore_current_thread (inferior_pid);
+ /* Save a copy of the command in case it is clobbered by
+ execute_command */
+ saved_cmd = xstrdup (cmd);
+ saved_cmd_cleanup_chain = make_cleanup (xfree, (void *) saved_cmd);
while (tidlist < cmd)
{
struct thread_info *tp;
if (*tidlist == '-') /* Got a range of IDs? */
{
- tidlist++; /* Skip the - */
+ tidlist++; /* Skip the - */
end = strtol (tidlist, &p, 10);
if (p == tidlist)
error ("Error parsing %s", tidlist);
target_pid_to_str (inferior_pid));
#endif
execute_command (cmd, from_tty);
+ strcpy (cmd, saved_cmd); /* Restore exact command used previously */
}
}
}
+
+ do_cleanups (saved_cmd_cleanup_chain);
+ do_cleanups (old_chain);
}
/* 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;
+thread_command (char *tidstr, int from_tty)
{
- int num;
- struct thread_info *tp;
-
if (!tidstr)
{
/* Don't generate an error, just say which thread is current. */
if (target_has_stack)
printf_filtered ("[Current thread is %d (%s)]\n",
- pid_to_thread_id(inferior_pid),
+ pid_to_thread_id (inferior_pid),
#if defined(HPUXHPPA)
- target_tid_to_str(inferior_pid)
+ target_tid_to_str (inferior_pid)
#else
- target_pid_to_str(inferior_pid)
+ target_pid_to_str (inferior_pid)
#endif
- );
+ );
else
error ("No stack.");
return;
}
- num = atoi (tidstr);
+
+ gdb_thread_select (tidstr);
+}
+
+static int
+do_captured_thread_select (void *tidstr)
+{
+ int num;
+ struct thread_info *tp;
+
+ num = atoi ((char *)tidstr);
tp = find_thread_id (num);
+#ifdef UI_OUT
+ if (!tp)
+ error ("Thread ID %d not known.", num);
+#else
if (!tp)
error ("Thread ID %d not known. Use the \"info threads\" command to\n\
see the IDs of currently known threads.", num);
+#endif
if (!thread_alive (tp))
error ("Thread ID %d has terminated.\n", num);
switch_to_thread (tp->pid);
- if (context_hook)
- context_hook (num);
-
+#ifdef UI_OUT
+ ui_out_text (uiout, "[Switching to thread ");
+ ui_out_field_int (uiout, "new-thread-id", pid_to_thread_id (inferior_pid));
+ ui_out_text (uiout, " (");
+#if defined(HPUXHPPA)
+ ui_out_text (uiout, target_tid_to_str (inferior_pid));
+#else
+ ui_out_text (uiout, target_pid_to_str (inferior_pid));
+#endif
+ ui_out_text (uiout, ")]");
+#else /* UI_OUT */
printf_filtered ("[Switching to thread %d (%s)]\n",
pid_to_thread_id (inferior_pid),
#if defined(HPUXHPPA)
#else
target_pid_to_str (inferior_pid)
#endif
- );
+ );
+#endif /* UI_OUT */
+
print_stack_frame (selected_frame, selected_frame_level, 1);
+ return GDB_RC_OK;
+}
+
+enum gdb_rc
+gdb_thread_select (char *tidstr)
+{
+ return catch_errors (do_captured_thread_select, tidstr,
+ NULL, RETURN_MASK_ALL);
}
/* Commands with a prefix of `thread'. */
struct cmd_list_element *thread_cmd_list = NULL;
void
-_initialize_thread ()
+_initialize_thread (void)
{
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.");
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