1 /* Multi-process/thread control defs for GDB, the GNU debugger.
2 Copyright (C) 1987-2018 Free Software Foundation, Inc.
3 Contributed by Lynx Real-Time Systems, Inc. Los Gatos, CA.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "breakpoint.h"
31 #include "common/vec.h"
32 #include "target/waitstatus.h"
33 #include "cli/cli-utils.h"
34 #include "common/refcounted-object.h"
35 #include "common-gdbthread.h"
37 /* Frontend view of the thread state. Possible extensions: stepping,
38 finishing, until(ling),... */
46 /* Inferior thread specific part of `struct infcall_control_state'.
48 Inferior process counterpart is `struct inferior_control_state'. */
50 struct thread_control_state
52 /* User/external stepping state. */
54 /* Step-resume or longjmp-resume breakpoint. */
55 struct breakpoint
*step_resume_breakpoint
;
57 /* Exception-resume breakpoint. */
58 struct breakpoint
*exception_resume_breakpoint
;
60 /* Breakpoints used for software single stepping. Plural, because
61 it may have multiple locations. E.g., if stepping over a
62 conditional branch instruction we can't decode the condition for,
63 we'll need to put a breakpoint at the branch destination, and
64 another at the instruction after the branch. */
65 struct breakpoint
*single_step_breakpoints
;
67 /* Range to single step within.
69 If this is nonzero, respond to a single-step signal by continuing
70 to step if the pc is in this range.
72 If step_range_start and step_range_end are both 1, it means to
73 step for a single instruction (FIXME: it might clean up
74 wait_for_inferior in a minor way if this were changed to the
75 address of the instruction and that address plus one. But maybe
77 CORE_ADDR step_range_start
; /* Inclusive */
78 CORE_ADDR step_range_end
; /* Exclusive */
80 /* Function the thread was in as of last it started stepping. */
81 struct symbol
*step_start_function
;
83 /* If GDB issues a target step request, and this is nonzero, the
84 target should single-step this thread once, and then continue
85 single-stepping it without GDB core involvement as long as the
86 thread stops in the step range above. If this is zero, the
87 target should ignore the step range, and only issue one single
91 /* Stack frame address as of when stepping command was issued.
92 This is how we know when we step into a subroutine call, and how
93 to set the frame for the breakpoint used to step out. */
94 struct frame_id step_frame_id
;
96 /* Similarly, the frame ID of the underlying stack frame (skipping
97 any inlined frames). */
98 struct frame_id step_stack_frame_id
;
100 /* Nonzero if we are presently stepping over a breakpoint.
102 If we hit a breakpoint or watchpoint, and then continue, we need
103 to single step the current thread with breakpoints disabled, to
104 avoid hitting the same breakpoint or watchpoint again. And we
105 should step just a single thread and keep other threads stopped,
106 so that other threads don't miss breakpoints while they are
109 So, this variable simultaneously means that we need to single
110 step the current thread, keep other threads stopped, and that
111 breakpoints should be removed while we step.
113 This variable is set either:
114 - in proceed, when we resume inferior on user's explicit request
115 - in keep_going, if handle_inferior_event decides we need to
116 step over breakpoint.
118 The variable is cleared in normal_stop. The proceed calls
119 wait_for_inferior, which calls handle_inferior_event in a loop,
120 and until wait_for_inferior exits, this variable is changed only
124 /* Nonzero if the thread is being proceeded for a "finish" command
125 or a similar situation when return value should be printed. */
126 int proceed_to_finish
;
128 /* Nonzero if the thread is being proceeded for an inferior function
132 enum step_over_calls_kind step_over_calls
;
134 /* Nonzero if stopped due to a step command. */
137 /* Chain containing status of breakpoint(s) the thread stopped
141 /* Whether the command that started the thread was a stepping
142 command. This is used to decide whether "set scheduler-locking
143 step" behaves like "on" or "off". */
144 int stepping_command
;
147 /* Inferior thread specific part of `struct infcall_suspend_state'. */
149 struct thread_suspend_state
151 /* Last signal that the inferior received (why it stopped). When
152 the thread is resumed, this signal is delivered. Note: the
153 target should not check whether the signal is in pass state,
154 because the signal may have been explicitly passed with the
155 "signal" command, which overrides "handle nopass". If the signal
156 should be suppressed, the core will take care of clearing this
157 before the target is resumed. */
158 enum gdb_signal stop_signal
;
160 /* The reason the thread last stopped, if we need to track it
161 (breakpoint, watchpoint, etc.) */
162 enum target_stop_reason stop_reason
;
164 /* The waitstatus for this thread's last event. */
165 struct target_waitstatus waitstatus
;
166 /* If true WAITSTATUS hasn't been handled yet. */
167 int waitstatus_pending_p
;
169 /* Record the pc of the thread the last time it stopped. (This is
170 not the current thread's PC as that may have changed since the
171 last stop, e.g., "return" command, or "p $pc = 0xf000"). This is
172 used in coordination with stop_reason and waitstatus_pending_p:
173 if the thread's PC is changed since it last stopped, a pending
174 breakpoint waitstatus is discarded. */
178 /* Base class for target-specific thread data. */
179 struct private_thread_info
181 virtual ~private_thread_info () = 0;
184 /* Threads are intrusively refcounted objects. Being the
185 user-selected thread is normally considered an implicit strong
186 reference and is thus not accounted in the refcount, unlike
187 inferior objects. This is necessary, because there's no "current
188 thread" pointer. Instead the current thread is inferred from the
189 inferior_ptid global. However, when GDB needs to remember the
190 selected thread to later restore it, GDB bumps the thread object's
191 refcount, to prevent something deleting the thread object before
192 reverting back (e.g., due to a "kill" command). If the thread
193 meanwhile exits before being re-selected, then the thread object is
194 left listed in the thread list, but marked with state
195 THREAD_EXITED. (See make_cleanup_restore_current_thread and
196 delete_thread). All other thread references are considered weak
197 references. Placing a thread in the thread list is an implicit
198 strong reference, and is thus not accounted for in the thread's
201 class thread_info
: public refcounted_object
204 explicit thread_info (inferior
*inf
, ptid_t ptid
);
207 bool deletable () const
209 /* If this is the current thread, or there's code out there that
210 relies on it existing (refcount > 0) we can't delete yet. */
211 return (refcount () == 0 && !ptid_equal (ptid
, inferior_ptid
));
214 struct thread_info
*next
= NULL
;
215 ptid_t ptid
; /* "Actual process id";
216 In fact, this may be overloaded with
217 kernel thread id, etc. */
219 /* Each thread has two GDB IDs.
221 a) The thread ID (Id). This consists of the pair of:
223 - the number of the thread's inferior and,
225 - the thread's thread number in its inferior, aka, the
226 per-inferior thread number. This number is unique in the
227 inferior but not unique between inferiors.
229 b) The global ID (GId). This is a a single integer unique
230 between all inferiors.
234 (gdb) info threads -gid
235 Id GId Target Id Frame
236 * 1.1 1 Thread A 0x16a09237 in foo () at foo.c:10
237 1.2 3 Thread B 0x15ebc6ed in bar () at foo.c:20
238 1.3 5 Thread C 0x15ebc6ed in bar () at foo.c:20
239 2.1 2 Thread A 0x16a09237 in foo () at foo.c:10
240 2.2 4 Thread B 0x15ebc6ed in bar () at foo.c:20
241 2.3 6 Thread C 0x15ebc6ed in bar () at foo.c:20
243 Above, both inferiors 1 and 2 have threads numbered 1-3, but each
244 thread has its own unique global ID. */
246 /* The thread's global GDB thread number. This is exposed to MI,
247 Python/Scheme, visible with "info threads -gid", and is also what
248 the $_gthread convenience variable is bound to. */
251 /* The per-inferior thread number. This is unique in the inferior
252 the thread belongs to, but not unique between inferiors. This is
253 what the $_thread convenience variable is bound to. */
256 /* The inferior this thread belongs to. */
257 struct inferior
*inf
;
259 /* The name of the thread, as specified by the user. This is NULL
260 if the thread does not have a user-given name. */
263 /* Non-zero means the thread is executing. Note: this is different
264 from saying that there is an active target and we are stopped at
265 a breakpoint, for instance. This is a real indicator whether the
266 thread is off and running. */
269 /* Non-zero if this thread is resumed from infrun's perspective.
270 Note that a thread can be marked both as not-executing and
271 resumed at the same time. This happens if we try to resume a
272 thread that has a wait status pending. We shouldn't let the
273 thread really run until that wait status has been processed, but
274 we should not process that wait status if we didn't try to let
278 /* Frontend view of the thread state. Note that the THREAD_RUNNING/
279 THREAD_STOPPED states are different from EXECUTING. When the
280 thread is stopped internally while handling an internal event,
281 like a software single-step breakpoint, EXECUTING will be false,
282 but STATE will still be THREAD_RUNNING. */
283 enum thread_state state
= THREAD_STOPPED
;
285 /* State of GDB control of inferior thread execution.
286 See `struct thread_control_state'. */
287 thread_control_state control
{};
289 /* State of inferior thread to restore after GDB is done with an inferior
290 call. See `struct thread_suspend_state'. */
291 thread_suspend_state suspend
{};
293 int current_line
= 0;
294 struct symtab
*current_symtab
= NULL
;
296 /* Internal stepping state. */
298 /* Record the pc of the thread the last time it was resumed. (It
299 can't be done on stop as the PC may change since the last stop,
300 e.g., "return" command, or "p $pc = 0xf000"). This is maintained
301 by proceed and keep_going, and among other things, it's used in
302 adjust_pc_after_break to distinguish a hardware single-step
303 SIGTRAP from a breakpoint SIGTRAP. */
304 CORE_ADDR prev_pc
= 0;
306 /* Did we set the thread stepping a breakpoint instruction? This is
307 used in conjunction with PREV_PC to decide whether to adjust the
309 int stepped_breakpoint
= 0;
311 /* Should we step over breakpoint next time keep_going is called? */
312 int stepping_over_breakpoint
= 0;
314 /* Should we step over a watchpoint next time keep_going is called?
315 This is needed on targets with non-continuable, non-steppable
317 int stepping_over_watchpoint
= 0;
319 /* Set to TRUE if we should finish single-stepping over a breakpoint
320 after hitting the current step-resume breakpoint. The context here
321 is that GDB is to do `next' or `step' while signal arrives.
322 When stepping over a breakpoint and signal arrives, GDB will attempt
323 to skip signal handler, so it inserts a step_resume_breakpoint at the
324 signal return address, and resume inferior.
325 step_after_step_resume_breakpoint is set to TRUE at this moment in
326 order to keep GDB in mind that there is still a breakpoint to step over
327 when GDB gets back SIGTRAP from step_resume_breakpoint. */
328 int step_after_step_resume_breakpoint
= 0;
330 /* Pointer to the state machine manager object that handles what is
331 left to do for the thread's execution command after the target
332 stops. Several execution commands use it. */
333 struct thread_fsm
*thread_fsm
= NULL
;
335 /* This is used to remember when a fork or vfork event was caught by
336 a catchpoint, and thus the event is to be followed at the next
337 resume of the thread, and not immediately. */
338 struct target_waitstatus pending_follow
;
340 /* True if this thread has been explicitly requested to stop. */
341 int stop_requested
= 0;
343 /* The initiating frame of a nexting operation, used for deciding
344 which exceptions to intercept. If it is null_frame_id no
345 bp_longjmp or bp_exception but longjmp has been caught just for
346 bp_longjmp_call_dummy. */
347 struct frame_id initiating_frame
= null_frame_id
;
349 /* Private data used by the target vector implementation. */
350 std::unique_ptr
<private_thread_info
> priv
;
352 /* Branch trace information for this thread. */
353 struct btrace_thread_info btrace
{};
355 /* Flag which indicates that the stack temporaries should be stored while
356 evaluating expressions. */
357 bool stack_temporaries_enabled
= false;
359 /* Values that are stored as temporaries on stack while evaluating
361 std::vector
<struct value
*> stack_temporaries
;
363 /* Step-over chain. A thread is in the step-over queue if these are
364 non-NULL. If only a single thread is in the chain, then these
365 fields point to self. */
366 struct thread_info
*step_over_prev
= NULL
;
367 struct thread_info
*step_over_next
= NULL
;
370 /* Create an empty thread list, or empty the existing one. */
371 extern void init_thread_list (void);
373 /* Add a thread to the thread list, print a message
374 that a new thread is found, and return the pointer to
375 the new thread. Caller my use this pointer to
376 initialize the private thread data. */
377 extern struct thread_info
*add_thread (ptid_t ptid
);
379 /* Same as add_thread, but does not print a message
381 extern struct thread_info
*add_thread_silent (ptid_t ptid
);
383 /* Same as add_thread, and sets the private info. */
384 extern struct thread_info
*add_thread_with_info (ptid_t ptid
,
385 struct private_thread_info
*);
387 /* Delete an existing thread list entry. */
388 extern void delete_thread (ptid_t
);
390 /* Delete an existing thread list entry, and be quiet about it. Used
391 after the process this thread having belonged to having already
392 exited, for example. */
393 extern void delete_thread_silent (ptid_t
);
395 /* Delete a step_resume_breakpoint from the thread database. */
396 extern void delete_step_resume_breakpoint (struct thread_info
*);
398 /* Delete an exception_resume_breakpoint from the thread database. */
399 extern void delete_exception_resume_breakpoint (struct thread_info
*);
401 /* Delete the single-step breakpoints of thread TP, if any. */
402 extern void delete_single_step_breakpoints (struct thread_info
*tp
);
404 /* Check if the thread has software single stepping breakpoints
406 extern int thread_has_single_step_breakpoints_set (struct thread_info
*tp
);
408 /* Check whether the thread has software single stepping breakpoints
410 extern int thread_has_single_step_breakpoint_here (struct thread_info
*tp
,
411 const address_space
*aspace
,
414 /* Translate the global integer thread id (GDB's homegrown id, not the
415 system's) into a "pid" (which may be overloaded with extra thread
417 extern ptid_t
global_thread_id_to_ptid (int num
);
419 /* Translate a 'pid' (which may be overloaded with extra thread
420 information) into the global integer thread id (GDB's homegrown id,
421 not the system's). */
422 extern int ptid_to_global_thread_id (ptid_t ptid
);
424 /* Returns whether to show inferior-qualified thread IDs, or plain
425 thread numbers. Inferior-qualified IDs are shown whenever we have
426 multiple inferiors, or the only inferior left has number > 1. */
427 extern int show_inferior_qualified_tids (void);
429 /* Return a string version of THR's thread ID. If there are multiple
430 inferiors, then this prints the inferior-qualifier form, otherwise
431 it only prints the thread number. The result is stored in a
432 circular static buffer, NUMCELLS deep. */
433 const char *print_thread_id (struct thread_info
*thr
);
435 /* Boolean test for an already-known pid (which may be overloaded with
436 extra thread information). */
437 extern int in_thread_list (ptid_t ptid
);
439 /* Boolean test for an already-known global thread id (GDB's homegrown
440 global id, not the system's). */
441 extern int valid_global_thread_id (int global_id
);
443 /* Search function to lookup a thread by 'pid'. */
444 extern struct thread_info
*find_thread_ptid (ptid_t ptid
);
446 /* Find thread by GDB global thread ID. */
447 struct thread_info
*find_thread_global_id (int global_id
);
449 /* Find thread by thread library specific handle in inferior INF. */
450 struct thread_info
*find_thread_by_handle (struct value
*thread_handle
,
451 struct inferior
*inf
);
453 /* Finds the first thread of the inferior given by PID. If PID is -1,
454 returns the first thread in the list. */
455 struct thread_info
*first_thread_of_process (int pid
);
457 /* Returns any thread of process PID, giving preference to the current
459 extern struct thread_info
*any_thread_of_process (int pid
);
461 /* Returns any non-exited thread of process PID, giving preference to
462 the current thread, and to not executing threads. */
463 extern struct thread_info
*any_live_thread_of_process (int pid
);
465 /* Change the ptid of thread OLD_PTID to NEW_PTID. */
466 void thread_change_ptid (ptid_t old_ptid
, ptid_t new_ptid
);
468 /* Iterator function to call a user-provided callback function
469 once for each known thread. */
470 typedef int (*thread_callback_func
) (struct thread_info
*, void *);
471 extern struct thread_info
*iterate_over_threads (thread_callback_func
, void *);
473 /* Traverse all threads. */
474 #define ALL_THREADS(T) \
475 for (T = thread_list; T; T = T->next) \
477 /* Traverse over all threads, sorted by inferior. */
478 #define ALL_THREADS_BY_INFERIOR(inf, tp) \
479 ALL_INFERIORS (inf) \
483 /* Traverse all threads, except those that have THREAD_EXITED
486 #define ALL_NON_EXITED_THREADS(T) \
487 for (T = thread_list; T; T = T->next) \
488 if ((T)->state != THREAD_EXITED)
490 /* Traverse all threads, including those that have THREAD_EXITED
491 state. Allows deleting the currently iterated thread. */
492 #define ALL_THREADS_SAFE(T, TMP) \
493 for ((T) = thread_list; \
494 (T) != NULL ? ((TMP) = (T)->next, 1): 0; \
497 extern int thread_count (void);
499 /* Switch from one thread to another. Does not read registers and
500 sets STOP_PC to -1. */
501 extern void switch_to_thread_no_regs (struct thread_info
*thread
);
503 /* Marks or clears thread(s) PTID as resumed. If PTID is
504 MINUS_ONE_PTID, applies to all threads. If ptid_is_pid(PTID) is
505 true, applies to all threads of the process pointed at by PTID. */
506 extern void set_resumed (ptid_t ptid
, int resumed
);
508 /* Marks thread PTID is running, or stopped.
509 If PTID is minus_one_ptid, marks all threads. */
510 extern void set_running (ptid_t ptid
, int running
);
512 /* Marks or clears thread(s) PTID as having been requested to stop.
513 If PTID is MINUS_ONE_PTID, applies to all threads. If
514 ptid_is_pid(PTID) is true, applies to all threads of the process
515 pointed at by PTID. If STOP, then the THREAD_STOP_REQUESTED
516 observer is called with PTID as argument. */
517 extern void set_stop_requested (ptid_t ptid
, int stop
);
519 /* NOTE: Since the thread state is not a boolean, most times, you do
520 not want to check it with negation. If you really want to check if
521 the thread is stopped,
525 if (is_stopped (ptid))
529 if (!is_running (ptid))
531 The latter also returns true on exited threads, most likelly not
534 /* Reports if in the frontend's perpective, thread PTID is running. */
535 extern int is_running (ptid_t ptid
);
537 /* Is this thread listed, but known to have exited? We keep it listed
538 (but not visible) until it's safe to delete. */
539 extern int is_exited (ptid_t ptid
);
541 /* In the frontend's perpective, is this thread stopped? */
542 extern int is_stopped (ptid_t ptid
);
544 /* Marks thread PTID as executing, or not. If PTID is minus_one_ptid,
547 Note that this is different from the running state. See the
548 description of state and executing fields of struct
550 extern void set_executing (ptid_t ptid
, int executing
);
552 /* Reports if thread PTID is executing. */
553 extern int is_executing (ptid_t ptid
);
555 /* True if any (known or unknown) thread is or may be executing. */
556 extern int threads_are_executing (void);
558 /* Merge the executing property of thread PTID over to its thread
559 state property (frontend running/stopped view).
561 "not executing" -> "stopped"
562 "executing" -> "running"
565 If PTID is minus_one_ptid, go over all threads.
567 Notifications are only emitted if the thread state did change. */
568 extern void finish_thread_state (ptid_t ptid
);
570 /* Same as FINISH_THREAD_STATE, but with an interface suitable to be
571 registered as a cleanup. PTID_P points to the ptid_t that is
572 passed to FINISH_THREAD_STATE. */
573 extern void finish_thread_state_cleanup (void *ptid_p
);
575 /* Commands with a prefix of `thread'. */
576 extern struct cmd_list_element
*thread_cmd_list
;
578 extern void thread_command (const char *tidstr
, int from_tty
);
580 /* Print notices on thread events (attach, detach, etc.), set with
581 `set print thread-events'. */
582 extern int print_thread_events
;
584 /* Prints the list of threads and their details on UIOUT. If
585 REQUESTED_THREADS, a list of GDB ids/ranges, is not NULL, only
586 print threads whose ID is included in the list. If PID is not -1,
587 only print threads from the process PID. Otherwise, threads from
588 all attached PIDs are printed. If both REQUESTED_THREADS is not
589 NULL and PID is not -1, then the thread is printed if it belongs to
590 the specified process. Otherwise, an error is raised. */
591 extern void print_thread_info (struct ui_out
*uiout
, char *requested_threads
,
594 /* Save/restore current inferior/thread/frame. */
596 class scoped_restore_current_thread
599 scoped_restore_current_thread ();
600 ~scoped_restore_current_thread ();
602 DISABLE_COPY_AND_ASSIGN (scoped_restore_current_thread
);
605 /* Use the "class" keyword here, because of a clash with a "thread_info"
606 function in the Darwin API. */
607 class thread_info
*m_thread
;
609 frame_id m_selected_frame_id
;
610 int m_selected_frame_level
;
614 /* Returns a pointer into the thread_info corresponding to
615 INFERIOR_PTID. INFERIOR_PTID *must* be in the thread list. */
616 extern struct thread_info
* inferior_thread (void);
618 extern void update_thread_list (void);
620 /* Delete any thread the target says is no longer alive. */
622 extern void prune_threads (void);
624 /* Delete threads marked THREAD_EXITED. Unlike prune_threads, this
625 does not consult the target about whether the thread is alive right
627 extern void delete_exited_threads (void);
629 /* Return true if PC is in the stepping range of THREAD. */
631 int pc_in_thread_step_range (CORE_ADDR pc
, struct thread_info
*thread
);
633 /* Enable storing stack temporaries for thread with id PTID and
634 disable and clear the stack temporaries on destruction. */
636 class enable_thread_stack_temporaries
640 explicit enable_thread_stack_temporaries (ptid_t ptid
)
643 struct thread_info
*tp
= find_thread_ptid (ptid
);
645 gdb_assert (tp
!= NULL
);
646 tp
->stack_temporaries_enabled
= true;
647 tp
->stack_temporaries
.clear ();
650 ~enable_thread_stack_temporaries ()
652 struct thread_info
*tp
= find_thread_ptid (m_ptid
);
656 tp
->stack_temporaries_enabled
= false;
657 tp
->stack_temporaries
.clear ();
661 DISABLE_COPY_AND_ASSIGN (enable_thread_stack_temporaries
);
668 extern bool thread_stack_temporaries_enabled_p (ptid_t ptid
);
670 extern void push_thread_stack_temporary (ptid_t ptid
, struct value
*v
);
672 extern struct value
*get_last_thread_stack_temporary (ptid_t
);
674 extern bool value_in_thread_stack_temporaries (struct value
*, ptid_t
);
676 /* Add TP to the end of its inferior's pending step-over chain. */
678 extern void thread_step_over_chain_enqueue (struct thread_info
*tp
);
680 /* Remove TP from its inferior's pending step-over chain. */
682 extern void thread_step_over_chain_remove (struct thread_info
*tp
);
684 /* Return the next thread in the step-over chain starting at TP. NULL
685 if TP is the last entry in the chain. */
687 extern struct thread_info
*thread_step_over_chain_next (struct thread_info
*tp
);
689 /* Return true if TP is in the step-over chain. */
691 extern int thread_is_in_step_over_chain (struct thread_info
*tp
);
693 /* Cancel any ongoing execution command. */
695 extern void thread_cancel_execution_command (struct thread_info
*thr
);
697 /* Check whether it makes sense to access a register of the current
698 thread at this point. If not, throw an error (e.g., the thread is
700 extern void validate_registers_access (void);
702 /* Check whether it makes sense to access a register of PTID at this point.
703 Returns true if registers may be accessed; false otherwise. */
704 extern bool can_access_registers_ptid (ptid_t ptid
);
706 /* Returns whether to show which thread hit the breakpoint, received a
707 signal, etc. and ended up causing a user-visible stop. This is
708 true iff we ever detected multiple threads. */
709 extern int show_thread_that_caused_stop (void);
711 /* Print the message for a thread or/and frame selected. */
712 extern void print_selected_thread_frame (struct ui_out
*uiout
,
713 user_selected_what selection
);
715 /* Helper for the CLI's "thread" command and for MI's -thread-select.
716 Selects thread THR. TIDSTR is the original string the thread ID
717 was parsed from. This is used in the error message if THR is not
719 extern void thread_select (const char *tidstr
, class thread_info
*thr
);
721 extern struct thread_info
*thread_list
;
723 #endif /* GDBTHREAD_H */