gdb/gdbthread.h

   1 /* Multi-process/thread control defs for GDB, the GNU debugger.
   2    Copyright (C) 1987-2016 Free Software Foundation, Inc.
   3    Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
   4
   5
   6    This file is part of GDB.
   7
   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.
  12
  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.
  17
  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/>.  */
  20
  21 #ifndef GDBTHREAD_H
  22 #define GDBTHREAD_H
  23
  24 struct symtab;
  25
  26 #include "breakpoint.h"
  27 #include "frame.h"
  28 #include "ui-out.h"
  29 #include "inferior.h"
  30 #include "btrace.h"
  31 #include "common/vec.h"
  32 #include "target/waitstatus.h"
  33 #include "cli/cli-utils.h"
  34
  35 /* Frontend view of the thread state.  Possible extensions: stepping,
  36    finishing, until(ling),...  */
  37 enum thread_state
  38 {
  39   THREAD_STOPPED,
  40   THREAD_RUNNING,
  41   THREAD_EXITED,
  42 };
  43
  44 /* Inferior thread specific part of `struct infcall_control_state'.
  45
  46    Inferior process counterpart is `struct inferior_control_state'.  */
  47
  48 struct thread_control_state
  49 {
  50   /* User/external stepping state.  */
  51
  52   /* Step-resume or longjmp-resume breakpoint.  */
  53   struct breakpoint *step_resume_breakpoint;
  54
  55   /* Exception-resume breakpoint.  */
  56   struct breakpoint *exception_resume_breakpoint;
  57
  58   /* Breakpoints used for software single stepping.  Plural, because
  59      it may have multiple locations.  E.g., if stepping over a
  60      conditional branch instruction we can't decode the condition for,
  61      we'll need to put a breakpoint at the branch destination, and
  62      another at the instruction after the branch.  */
  63   struct breakpoint *single_step_breakpoints;
  64
  65   /* Range to single step within.
  66
  67      If this is nonzero, respond to a single-step signal by continuing
  68      to step if the pc is in this range.
  69
  70      If step_range_start and step_range_end are both 1, it means to
  71      step for a single instruction (FIXME: it might clean up
  72      wait_for_inferior in a minor way if this were changed to the
  73      address of the instruction and that address plus one.  But maybe
  74      not).  */
  75   CORE_ADDR step_range_start;   /* Inclusive */
  76   CORE_ADDR step_range_end;     /* Exclusive */
  77
  78   /* Function the thread was in as of last it started stepping.  */
  79   struct symbol *step_start_function;
  80
  81   /* If GDB issues a target step request, and this is nonzero, the
  82      target should single-step this thread once, and then continue
  83      single-stepping it without GDB core involvement as long as the
  84      thread stops in the step range above.  If this is zero, the
  85      target should ignore the step range, and only issue one single
  86      step.  */
  87   int may_range_step;
  88
  89   /* Stack frame address as of when stepping command was issued.
  90      This is how we know when we step into a subroutine call, and how
  91      to set the frame for the breakpoint used to step out.  */
  92   struct frame_id step_frame_id;
  93
  94   /* Similarly, the frame ID of the underlying stack frame (skipping
  95      any inlined frames).  */
  96   struct frame_id step_stack_frame_id;
  97
  98   /* Nonzero if we are presently stepping over a breakpoint.
  99
 100      If we hit a breakpoint or watchpoint, and then continue, we need
 101      to single step the current thread with breakpoints disabled, to
 102      avoid hitting the same breakpoint or watchpoint again.  And we
 103      should step just a single thread and keep other threads stopped,
 104      so that other threads don't miss breakpoints while they are
 105      removed.
 106
 107      So, this variable simultaneously means that we need to single
 108      step the current thread, keep other threads stopped, and that
 109      breakpoints should be removed while we step.
 110
 111      This variable is set either:
 112      - in proceed, when we resume inferior on user's explicit request
 113      - in keep_going, if handle_inferior_event decides we need to
 114      step over breakpoint.
 115
 116      The variable is cleared in normal_stop.  The proceed calls
 117      wait_for_inferior, which calls handle_inferior_event in a loop,
 118      and until wait_for_inferior exits, this variable is changed only
 119      by keep_going.  */
 120   int trap_expected;
 121
 122   /* Nonzero if the thread is being proceeded for a "finish" command
 123      or a similar situation when return value should be printed.  */
 124   int proceed_to_finish;
 125
 126   /* Nonzero if the thread is being proceeded for an inferior function
 127      call.  */
 128   int in_infcall;
 129
 130   enum step_over_calls_kind step_over_calls;
 131
 132   /* Nonzero if stopped due to a step command.  */
 133   int stop_step;
 134
 135   /* Chain containing status of breakpoint(s) the thread stopped
 136      at.  */
 137   bpstat stop_bpstat;
 138
 139   /* The interpreter that issued the execution command.  NULL if the
 140      thread was resumed as a result of a command applied to some other
 141      thread (e.g., "next" with scheduler-locking off).  */
 142   struct interp *command_interp;
 143
 144   /* Whether the command that started the thread was a stepping
 145      command.  This is used to decide whether "set scheduler-locking
 146      step" behaves like "on" or "off".  */
 147   int stepping_command;
 148 };
 149
 150 /* Inferior thread specific part of `struct infcall_suspend_state'.  */
 151
 152 struct thread_suspend_state
 153 {
 154   /* Last signal that the inferior received (why it stopped).  When
 155      the thread is resumed, this signal is delivered.  Note: the
 156      target should not check whether the signal is in pass state,
 157      because the signal may have been explicitly passed with the
 158      "signal" command, which overrides "handle nopass".  If the signal
 159      should be suppressed, the core will take care of clearing this
 160      before the target is resumed.  */
 161   enum gdb_signal stop_signal;
 162
 163   /* The reason the thread last stopped, if we need to track it
 164      (breakpoint, watchpoint, etc.)  */
 165   enum target_stop_reason stop_reason;
 166
 167   /* The waitstatus for this thread's last event.  */
 168   struct target_waitstatus waitstatus;
 169   /* If true WAITSTATUS hasn't been handled yet.  */
 170   int waitstatus_pending_p;
 171
 172   /* Record the pc of the thread the last time it stopped.  (This is
 173      not the current thread's PC as that may have changed since the
 174      last stop, e.g., "return" command, or "p $pc = 0xf000").  This is
 175      used in coordination with stop_reason and waitstatus_pending_p:
 176      if the thread's PC is changed since it last stopped, a pending
 177      breakpoint waitstatus is discarded.  */
 178   CORE_ADDR stop_pc;
 179 };
 180
 181 typedef struct value *value_ptr;
 182 DEF_VEC_P (value_ptr);
 183 typedef VEC (value_ptr) value_vec;
 184
 185 struct thread_info
 186 {
 187   struct thread_info *next;
 188   ptid_t ptid;                  /* "Actual process id";
 189                                     In fact, this may be overloaded with
 190                                     kernel thread id, etc.  */
 191
 192   /* Each thread has two GDB IDs.
 193
 194      a) The thread ID (Id).  This consists of the pair of:
 195
 196         - the number of the thread's inferior and,
 197
 198         - the thread's thread number in its inferior, aka, the
 199           per-inferior thread number.  This number is unique in the
 200           inferior but not unique between inferiors.
 201
 202      b) The global ID (GId).  This is a a single integer unique
 203         between all inferiors.
 204
 205      E.g.:
 206
 207       (gdb) info threads -gid
 208         Id    GId   Target Id   Frame
 209       * 1.1   1     Thread A    0x16a09237 in foo () at foo.c:10
 210         1.2   3     Thread B    0x15ebc6ed in bar () at foo.c:20
 211         1.3   5     Thread C    0x15ebc6ed in bar () at foo.c:20
 212         2.1   2     Thread A    0x16a09237 in foo () at foo.c:10
 213         2.2   4     Thread B    0x15ebc6ed in bar () at foo.c:20
 214         2.3   6     Thread C    0x15ebc6ed in bar () at foo.c:20
 215
 216      Above, both inferiors 1 and 2 have threads numbered 1-3, but each
 217      thread has its own unique global ID.  */
 218
 219   /* The thread's global GDB thread number.  This is exposed to MI,
 220      Python/Scheme, visible with "info threads -gid", and is also what
 221      the $_gthread convenience variable is bound to.  */
 222   int global_num;
 223
 224   /* The per-inferior thread number.  This is unique in the inferior
 225      the thread belongs to, but not unique between inferiors.  This is
 226      what the $_thread convenience variable is bound to.  */
 227   int per_inf_num;
 228
 229   /* The inferior this thread belongs to.  */
 230   struct inferior *inf;
 231
 232   /* The name of the thread, as specified by the user.  This is NULL
 233      if the thread does not have a user-given name.  */
 234   char *name;
 235
 236   /* Non-zero means the thread is executing.  Note: this is different
 237      from saying that there is an active target and we are stopped at
 238      a breakpoint, for instance.  This is a real indicator whether the
 239      thread is off and running.  */
 240   int executing;
 241
 242   /* Non-zero if this thread is resumed from infrun's perspective.
 243      Note that a thread can be marked both as not-executing and
 244      resumed at the same time.  This happens if we try to resume a
 245      thread that has a wait status pending.  We shouldn't let the
 246      thread really run until that wait status has been processed, but
 247      we should not process that wait status if we didn't try to let
 248      the thread run.  */
 249   int resumed;
 250
 251   /* Frontend view of the thread state.  Note that the THREAD_RUNNING/
 252      THREAD_STOPPED states are different from EXECUTING.  When the
 253      thread is stopped internally while handling an internal event,
 254      like a software single-step breakpoint, EXECUTING will be false,
 255      but STATE will still be THREAD_RUNNING.  */
 256   enum thread_state state;
 257
 258   /* If this is > 0, then it means there's code out there that relies
 259      on this thread being listed.  Don't delete it from the lists even
 260      if we detect it exiting.  */
 261   int refcount;
 262
 263   /* State of GDB control of inferior thread execution.
 264      See `struct thread_control_state'.  */
 265   struct thread_control_state control;
 266
 267   /* State of inferior thread to restore after GDB is done with an inferior
 268      call.  See `struct thread_suspend_state'.  */
 269   struct thread_suspend_state suspend;
 270
 271   int current_line;
 272   struct symtab *current_symtab;
 273
 274   /* Internal stepping state.  */
 275
 276   /* Record the pc of the thread the last time it was resumed.  (It
 277      can't be done on stop as the PC may change since the last stop,
 278      e.g., "return" command, or "p $pc = 0xf000").  This is maintained
 279      by proceed and keep_going, and among other things, it's used in
 280      adjust_pc_after_break to distinguish a hardware single-step
 281      SIGTRAP from a breakpoint SIGTRAP.  */
 282   CORE_ADDR prev_pc;
 283
 284   /* Did we set the thread stepping a breakpoint instruction?  This is
 285      used in conjunction with PREV_PC to decide whether to adjust the
 286      PC.  */
 287   int stepped_breakpoint;
 288
 289   /* Should we step over breakpoint next time keep_going is called?  */
 290   int stepping_over_breakpoint;
 291
 292   /* Should we step over a watchpoint next time keep_going is called?
 293      This is needed on targets with non-continuable, non-steppable
 294      watchpoints.  */
 295   int stepping_over_watchpoint;
 296
 297   /* Set to TRUE if we should finish single-stepping over a breakpoint
 298      after hitting the current step-resume breakpoint.  The context here
 299      is that GDB is to do `next' or `step' while signal arrives.
 300      When stepping over a breakpoint and signal arrives, GDB will attempt
 301      to skip signal handler, so it inserts a step_resume_breakpoint at the
 302      signal return address, and resume inferior.
 303      step_after_step_resume_breakpoint is set to TRUE at this moment in
 304      order to keep GDB in mind that there is still a breakpoint to step over
 305      when GDB gets back SIGTRAP from step_resume_breakpoint.  */
 306   int step_after_step_resume_breakpoint;
 307
 308   /* Pointer to the state machine manager object that handles what is
 309      left to do for the thread's execution command after the target
 310      stops.  Several execution commands use it.  */
 311   struct thread_fsm *thread_fsm;
 312
 313   /* This is used to remember when a fork or vfork event was caught by
 314      a catchpoint, and thus the event is to be followed at the next
 315      resume of the thread, and not immediately.  */
 316   struct target_waitstatus pending_follow;
 317
 318   /* True if this thread has been explicitly requested to stop.  */
 319   int stop_requested;
 320
 321   /* The initiating frame of a nexting operation, used for deciding
 322      which exceptions to intercept.  If it is null_frame_id no
 323      bp_longjmp or bp_exception but longjmp has been caught just for
 324      bp_longjmp_call_dummy.  */
 325   struct frame_id initiating_frame;
 326
 327   /* Private data used by the target vector implementation.  */
 328   struct private_thread_info *priv;
 329
 330   /* Function that is called to free PRIVATE.  If this is NULL, then
 331      xfree will be called on PRIVATE.  */
 332   void (*private_dtor) (struct private_thread_info *);
 333
 334   /* Branch trace information for this thread.  */
 335   struct btrace_thread_info btrace;
 336
 337   /* Flag which indicates that the stack temporaries should be stored while
 338      evaluating expressions.  */
 339   int stack_temporaries_enabled;
 340
 341   /* Values that are stored as temporaries on stack while evaluating
 342      expressions.  */
 343   value_vec *stack_temporaries;
 344
 345   /* Step-over chain.  A thread is in the step-over queue if these are
 346      non-NULL.  If only a single thread is in the chain, then these
 347      fields point to self.  */
 348   struct thread_info *step_over_prev;
 349   struct thread_info *step_over_next;
 350 };
 351
 352 /* Create an empty thread list, or empty the existing one.  */
 353 extern void init_thread_list (void);
 354
 355 /* Add a thread to the thread list, print a message
 356    that a new thread is found, and return the pointer to
 357    the new thread.  Caller my use this pointer to
 358    initialize the private thread data.  */
 359 extern struct thread_info *add_thread (ptid_t ptid);
 360
 361 /* Same as add_thread, but does not print a message
 362    about new thread.  */
 363 extern struct thread_info *add_thread_silent (ptid_t ptid);
 364
 365 /* Same as add_thread, and sets the private info.  */
 366 extern struct thread_info *add_thread_with_info (ptid_t ptid,
 367                                                  struct private_thread_info *);
 368
 369 /* Delete an existing thread list entry.  */
 370 extern void delete_thread (ptid_t);
 371
 372 /* Delete an existing thread list entry, and be quiet about it.  Used
 373    after the process this thread having belonged to having already
 374    exited, for example.  */
 375 extern void delete_thread_silent (ptid_t);
 376
 377 /* Delete a step_resume_breakpoint from the thread database.  */
 378 extern void delete_step_resume_breakpoint (struct thread_info *);
 379
 380 /* Delete an exception_resume_breakpoint from the thread database.  */
 381 extern void delete_exception_resume_breakpoint (struct thread_info *);
 382
 383 /* Delete the single-step breakpoints of thread TP, if any.  */
 384 extern void delete_single_step_breakpoints (struct thread_info *tp);
 385
 386 /* Check if the thread has software single stepping breakpoints
 387    set.  */
 388 extern int thread_has_single_step_breakpoints_set (struct thread_info *tp);
 389
 390 /* Check whether the thread has software single stepping breakpoints
 391    set at PC.  */
 392 extern int thread_has_single_step_breakpoint_here (struct thread_info *tp,
 393                                                    struct address_space *aspace,
 394                                                    CORE_ADDR addr);
 395
 396 /* Translate the global integer thread id (GDB's homegrown id, not the
 397    system's) into a "pid" (which may be overloaded with extra thread
 398    information).  */
 399 extern ptid_t global_thread_id_to_ptid (int num);
 400
 401 /* Translate a 'pid' (which may be overloaded with extra thread
 402    information) into the global integer thread id (GDB's homegrown id,
 403    not the system's).  */
 404 extern int ptid_to_global_thread_id (ptid_t ptid);
 405
 406 /* Returns whether to show inferior-qualified thread IDs, or plain
 407    thread numbers.  Inferior-qualified IDs are shown whenever we have
 408    multiple inferiors, or the only inferior left has number > 1.  */
 409 extern int show_inferior_qualified_tids (void);
 410
 411 /* Return a string version of THR's thread ID.  If there are multiple
 412    inferiors, then this prints the inferior-qualifier form, otherwise
 413    it only prints the thread number.  The result is stored in a
 414    circular static buffer, NUMCELLS deep.  */
 415 const char *print_thread_id (struct thread_info *thr);
 416
 417 /* Boolean test for an already-known pid (which may be overloaded with
 418    extra thread information).  */
 419 extern int in_thread_list (ptid_t ptid);
 420
 421 /* Boolean test for an already-known global thread id (GDB's homegrown
 422    global id, not the system's).  */
 423 extern int valid_global_thread_id (int global_id);
 424
 425 /* Search function to lookup a thread by 'pid'.  */
 426 extern struct thread_info *find_thread_ptid (ptid_t ptid);
 427
 428 /* Find thread by GDB global thread ID.  */
 429 struct thread_info *find_thread_global_id (int global_id);
 430
 431 /* Finds the first thread of the inferior given by PID.  If PID is -1,
 432    returns the first thread in the list.  */
 433 struct thread_info *first_thread_of_process (int pid);
 434
 435 /* Returns any thread of process PID, giving preference to the current
 436    thread.  */
 437 extern struct thread_info *any_thread_of_process (int pid);
 438
 439 /* Returns any non-exited thread of process PID, giving preference to
 440    the current thread, and to not executing threads.  */
 441 extern struct thread_info *any_live_thread_of_process (int pid);
 442
 443 /* Change the ptid of thread OLD_PTID to NEW_PTID.  */
 444 void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);
 445
 446 /* Iterator function to call a user-provided callback function
 447    once for each known thread.  */
 448 typedef int (*thread_callback_func) (struct thread_info *, void *);
 449 extern struct thread_info *iterate_over_threads (thread_callback_func, void *);
 450
 451 /* Traverse all threads.  */
 452 #define ALL_THREADS(T)                          \
 453   for (T = thread_list; T; T = T->next)         \
 454
 455 /* Traverse over all threads, sorted by inferior.  */
 456 #define ALL_THREADS_BY_INFERIOR(inf, tp) \
 457   ALL_INFERIORS (inf) \
 458     ALL_THREADS (tp) \
 459       if (inf == tp->inf)
 460
 461 /* Traverse all threads, except those that have THREAD_EXITED
 462    state.  */
 463
 464 #define ALL_NON_EXITED_THREADS(T)                               \
 465   for (T = thread_list; T; T = T->next) \
 466     if ((T)->state != THREAD_EXITED)
 467
 468 /* Traverse all threads, including those that have THREAD_EXITED
 469    state.  Allows deleting the currently iterated thread.  */
 470 #define ALL_THREADS_SAFE(T, TMP)        \
 471   for ((T) = thread_list;                       \
 472        (T) != NULL ? ((TMP) = (T)->next, 1): 0; \
 473        (T) = (TMP))
 474
 475 extern int thread_count (void);
 476
 477 /* Switch from one thread to another.  Also sets the STOP_PC
 478    global.  */
 479 extern void switch_to_thread (ptid_t ptid);
 480
 481 /* Switch from one thread to another.  Does not read registers and
 482    sets STOP_PC to -1.  */
 483 extern void switch_to_thread_no_regs (struct thread_info *thread);
 484
 485 /* Marks or clears thread(s) PTID as resumed.  If PTID is
 486    MINUS_ONE_PTID, applies to all threads.  If ptid_is_pid(PTID) is
 487    true, applies to all threads of the process pointed at by PTID.  */
 488 extern void set_resumed (ptid_t ptid, int resumed);
 489
 490 /* Marks thread PTID is running, or stopped.
 491    If PTID is minus_one_ptid, marks all threads.  */
 492 extern void set_running (ptid_t ptid, int running);
 493
 494 /* Marks or clears thread(s) PTID as having been requested to stop.
 495    If PTID is MINUS_ONE_PTID, applies to all threads.  If
 496    ptid_is_pid(PTID) is true, applies to all threads of the process
 497    pointed at by PTID.  If STOP, then the THREAD_STOP_REQUESTED
 498    observer is called with PTID as argument.  */
 499 extern void set_stop_requested (ptid_t ptid, int stop);
 500
 501 /* NOTE: Since the thread state is not a boolean, most times, you do
 502    not want to check it with negation.  If you really want to check if
 503    the thread is stopped,
 504
 505     use (good):
 506
 507      if (is_stopped (ptid))
 508
 509     instead of (bad):
 510
 511      if (!is_running (ptid))
 512
 513    The latter also returns true on exited threads, most likelly not
 514    what you want.  */
 515
 516 /* Reports if in the frontend's perpective, thread PTID is running.  */
 517 extern int is_running (ptid_t ptid);
 518
 519 /* Is this thread listed, but known to have exited?  We keep it listed
 520    (but not visible) until it's safe to delete.  */
 521 extern int is_exited (ptid_t ptid);
 522
 523 /* In the frontend's perpective, is this thread stopped?  */
 524 extern int is_stopped (ptid_t ptid);
 525
 526 /* Marks thread PTID as executing, or not.  If PTID is minus_one_ptid,
 527    marks all threads.
 528
 529    Note that this is different from the running state.  See the
 530    description of state and executing fields of struct
 531    thread_info.  */
 532 extern void set_executing (ptid_t ptid, int executing);
 533
 534 /* Reports if thread PTID is executing.  */
 535 extern int is_executing (ptid_t ptid);
 536
 537 /* True if any (known or unknown) thread is or may be executing.  */
 538 extern int threads_are_executing (void);
 539
 540 /* Merge the executing property of thread PTID over to its thread
 541    state property (frontend running/stopped view).
 542
 543    "not executing" -> "stopped"
 544    "executing"     -> "running"
 545    "exited"        -> "exited"
 546
 547    If PTID is minus_one_ptid, go over all threads.
 548
 549    Notifications are only emitted if the thread state did change.  */
 550 extern void finish_thread_state (ptid_t ptid);
 551
 552 /* Same as FINISH_THREAD_STATE, but with an interface suitable to be
 553    registered as a cleanup.  PTID_P points to the ptid_t that is
 554    passed to FINISH_THREAD_STATE.  */
 555 extern void finish_thread_state_cleanup (void *ptid_p);
 556
 557 /* Commands with a prefix of `thread'.  */
 558 extern struct cmd_list_element *thread_cmd_list;
 559
 560 extern void thread_command (char *tidstr, int from_tty);
 561
 562 /* Print notices on thread events (attach, detach, etc.), set with
 563    `set print thread-events'.  */
 564 extern int print_thread_events;
 565
 566 /* Prints the list of threads and their details on UIOUT.  If
 567    REQUESTED_THREADS, a list of GDB ids/ranges, is not NULL, only
 568    print threads whose ID is included in the list.  If PID is not -1,
 569    only print threads from the process PID.  Otherwise, threads from
 570    all attached PIDs are printed.  If both REQUESTED_THREADS is not
 571    NULL and PID is not -1, then the thread is printed if it belongs to
 572    the specified process.  Otherwise, an error is raised.  */
 573 extern void print_thread_info (struct ui_out *uiout, char *requested_threads,
 574                                int pid);
 575
 576 extern struct cleanup *make_cleanup_restore_current_thread (void);
 577
 578 /* Returns a pointer into the thread_info corresponding to
 579    INFERIOR_PTID.  INFERIOR_PTID *must* be in the thread list.  */
 580 extern struct thread_info* inferior_thread (void);
 581
 582 extern void update_thread_list (void);
 583
 584 /* Delete any thread the target says is no longer alive.  */
 585
 586 extern void prune_threads (void);
 587
 588 /* Delete threads marked THREAD_EXITED.  Unlike prune_threads, this
 589    does not consult the target about whether the thread is alive right
 590    now.  */
 591 extern void delete_exited_threads (void);
 592
 593 /* Return true if PC is in the stepping range of THREAD.  */
 594
 595 int pc_in_thread_step_range (CORE_ADDR pc, struct thread_info *thread);
 596
 597 extern struct cleanup *enable_thread_stack_temporaries (ptid_t ptid);
 598
 599 extern int thread_stack_temporaries_enabled_p (ptid_t ptid);
 600
 601 extern void push_thread_stack_temporary (ptid_t ptid, struct value *v);
 602
 603 extern struct value *get_last_thread_stack_temporary (ptid_t);
 604
 605 extern int value_in_thread_stack_temporaries (struct value *, ptid_t);
 606
 607 /* Add TP to the end of its inferior's pending step-over chain.  */
 608
 609 extern void thread_step_over_chain_enqueue (struct thread_info *tp);
 610
 611 /* Remove TP from its inferior's pending step-over chain.  */
 612
 613 extern void thread_step_over_chain_remove (struct thread_info *tp);
 614
 615 /* Return the next thread in the step-over chain starting at TP.  NULL
 616    if TP is the last entry in the chain.  */
 617
 618 extern struct thread_info *thread_step_over_chain_next (struct thread_info *tp);
 619
 620 /* Return true if TP is in the step-over chain.  */
 621
 622 extern int thread_is_in_step_over_chain (struct thread_info *tp);
 623
 624 /* Cancel any ongoing execution command.  */
 625
 626 extern void thread_cancel_execution_command (struct thread_info *thr);
 627
 628 /* Check whether it makes sense to access a register of the current
 629    thread at this point.  If not, throw an error (e.g., the thread is
 630    executing).  */
 631 extern void validate_registers_access (void);
 632
 633 /* Returns whether to show which thread hit the breakpoint, received a
 634    signal, etc. and ended up causing a user-visible stop.  This is
 635    true iff we ever detected multiple threads.  */
 636 extern int show_thread_that_caused_stop (void);
 637
 638 extern struct thread_info *thread_list;
 639
 640 #endif /* GDBTHREAD_H */