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1 227 jeremybenn
/* Multi-process/thread control defs for GDB, the GNU debugger.
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   Copyright (C) 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1997, 1998, 1999,
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   2000, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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   Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#ifndef GDBTHREAD_H
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#define GDBTHREAD_H
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struct symtab;
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#include "breakpoint.h"
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#include "frame.h"
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#include "ui-out.h"
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#include "inferior.h"
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struct thread_info
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{
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  struct thread_info *next;
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  ptid_t ptid;                  /* "Actual process id";
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                                    In fact, this may be overloaded with
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                                    kernel thread id, etc.  */
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  int num;                      /* Convenient handle (GDB thread id) */
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  /* Non-zero means the thread is executing.  Note: this is different
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     from saying that there is an active target and we are stopped at
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     a breakpoint, for instance.  This is a real indicator whether the
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     thread is off and running.  */
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  /* This field is internal to thread.c.  Never access it directly,
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     use is_executing instead.  */
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  int executing_;
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  /* Frontend view of the thread state.  Note that the RUNNING/STOPPED
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     states are different from EXECUTING.  When the thread is stopped
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     internally while handling an internal event, like a software
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     single-step breakpoint, EXECUTING will be false, but running will
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     still be true.  As a possible future extension, this could turn
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     into enum { stopped, exited, stepping, finishing, until(ling),
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     running ... }  */
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  /* This field is internal to thread.c.  Never access it directly,
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     use is_running instead.  */
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  int state_;
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  /* If this is > 0, then it means there's code out there that relies
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     on this thread being listed.  Don't delete it from the lists even
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     if we detect it exiting.  */
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  int refcount;
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  /* User/external stepping state.  */
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  /* Step-resume or longjmp-resume breakpoint.  */
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  struct breakpoint *step_resume_breakpoint;
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  /* Range to single step within.
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     If this is nonzero, respond to a single-step signal by continuing
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     to step if the pc is in this range.
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     If step_range_start and step_range_end are both 1, it means to
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     step for a single instruction (FIXME: it might clean up
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     wait_for_inferior in a minor way if this were changed to the
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     address of the instruction and that address plus one.  But maybe
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     not.).  */
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  CORE_ADDR step_range_start;   /* Inclusive */
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  CORE_ADDR step_range_end;     /* Exclusive */
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  /* Stack frame address as of when stepping command was issued.
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     This is how we know when we step into a subroutine call, and how
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     to set the frame for the breakpoint used to step out.  */
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  struct frame_id step_frame_id;
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  /* Similarly, the frame ID of the underlying stack frame (skipping
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     any inlined frames).  */
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  struct frame_id step_stack_frame_id;
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  int current_line;
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  struct symtab *current_symtab;
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  /* Internal stepping state.  */
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  /* Record the pc of the thread the last time it stopped.  This is
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     maintained by proceed and keep_going, and used in
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     adjust_pc_after_break to distinguish a hardware single-step
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     SIGTRAP from a breakpoint SIGTRAP.  */
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  CORE_ADDR prev_pc;
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  /* Nonzero if we are presently stepping over a breakpoint.
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     If we hit a breakpoint or watchpoint, and then continue, we need
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     to single step the current thread with breakpoints disabled, to
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     avoid hitting the same breakpoint or watchpoint again.  And we
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     should step just a single thread and keep other threads stopped,
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     so that other threads don't miss breakpoints while they are
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     removed.
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     So, this variable simultaneously means that we need to single
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     step the current thread, keep other threads stopped, and that
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     breakpoints should be removed while we step.
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     This variable is set either:
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     - in proceed, when we resume inferior on user's explicit request
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     - in keep_going, if handle_inferior_event decides we need to
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     step over breakpoint.
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     The variable is cleared in normal_stop.  The proceed calls
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     wait_for_inferior, which calls handle_inferior_event in a loop,
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     and until wait_for_inferior exits, this variable is changed only
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     by keep_going.  */
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  int trap_expected;
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  /* Should we step over breakpoint next time keep_going is called?  */
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  int stepping_over_breakpoint;
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  /* Set to TRUE if we should finish single-stepping over a breakpoint
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     after hitting the current step-resume breakpoint.  */
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  int step_after_step_resume_breakpoint;
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133
  /* This is set TRUE when a catchpoint of a shared library event
134
     triggers.  Since we don't wish to leave the inferior in the
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     solib hook when we report the event, we step the inferior
136
     back to user code before stopping and reporting the event.  */
137
  int stepping_through_solib_after_catch;
138
 
139
  /* When stepping_through_solib_after_catch is TRUE, this is a
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     list of the catchpoints that should be reported as triggering
141
     when we finally do stop stepping.  */
142
  bpstat stepping_through_solib_catchpoints;
143
 
144
  /* Per-thread command support.  */
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  /* Pointer to what is left to do for an execution command after the
147
     target stops.  Used only in asynchronous mode, by targets that
148
     support async execution.  Several execution commands use it.  */
149
  struct continuation *continuations;
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151
  /* Similar to the above, but used when a single execution command
152
     requires several resume/stop iterations.  Used by the step
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     command.  */
154
  struct continuation *intermediate_continuations;
155
 
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  /* Nonzero if the thread is being proceeded for a "finish" command
157
     or a similar situation when stop_registers should be saved.  */
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  int proceed_to_finish;
159
 
160
  /* Nonzero if the thread is being proceeded for an inferior function
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     call.  */
162
  int in_infcall;
163
 
164
  enum step_over_calls_kind step_over_calls;
165
 
166
  /* Nonzero if stopped due to a step command.  */
167
  int stop_step;
168
 
169
  /* If stepping, nonzero means step count is > 1 so don't print frame
170
     next time inferior stops if it stops due to stepping.  */
171
  int step_multi;
172
 
173
  /* This is used to remember when a fork or vfork event was caught by
174
     a catchpoint, and thus the event is to be followed at the next
175
     resume of the thread, and not immediately.  */
176
  struct target_waitstatus pending_follow;
177
 
178
  /* Last signal that the inferior received (why it stopped).  */
179
  enum target_signal stop_signal;
180
 
181
  /* Chain containing status of breakpoint(s) the thread stopped
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     at.  */
183
  bpstat stop_bpstat;
184
 
185
  /* True if this thread has been explicitly requested to stop.  */
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  int stop_requested;
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188
  /* Private data used by the target vector implementation.  */
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  struct private_thread_info *private;
190
 
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  /* Function that is called to free PRIVATE.  If this is NULL, then
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     xfree will be called on PRIVATE.  */
193
  void (*private_dtor) (struct private_thread_info *);
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};
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/* Create an empty thread list, or empty the existing one.  */
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extern void init_thread_list (void);
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/* Add a thread to the thread list, print a message
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   that a new thread is found, and return the pointer to
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   the new thread.  Caller my use this pointer to
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   initialize the private thread data.  */
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extern struct thread_info *add_thread (ptid_t ptid);
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/* Same as add_thread, but does not print a message
206
   about new thread.  */
207
extern struct thread_info *add_thread_silent (ptid_t ptid);
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/* Same as add_thread, and sets the private info.  */
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extern struct thread_info *add_thread_with_info (ptid_t ptid,
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                                                 struct private_thread_info *);
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/* Delete an existing thread list entry.  */
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extern void delete_thread (ptid_t);
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/* Delete an existing thread list entry, and be quiet about it.  Used
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   after the process this thread having belonged to having already
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   exited, for example.  */
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extern void delete_thread_silent (ptid_t);
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/* Delete a step_resume_breakpoint from the thread database. */
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extern void delete_step_resume_breakpoint (struct thread_info *);
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/* Translate the integer thread id (GDB's homegrown id, not the system's)
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   into a "pid" (which may be overloaded with extra thread information).  */
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extern ptid_t thread_id_to_pid (int);
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/* Translate a 'pid' (which may be overloaded with extra thread information)
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   into the integer thread id (GDB's homegrown id, not the system's).  */
230
extern int pid_to_thread_id (ptid_t ptid);
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232
/* Boolean test for an already-known pid (which may be overloaded with
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   extra thread information).  */
234
extern int in_thread_list (ptid_t ptid);
235
 
236
/* Boolean test for an already-known thread id (GDB's homegrown id,
237
   not the system's).  */
238
extern int valid_thread_id (int thread);
239
 
240
/* Search function to lookup a thread by 'pid'.  */
241
extern struct thread_info *find_thread_ptid (ptid_t ptid);
242
 
243
/* Find thread by GDB user-visible thread number.  */
244
struct thread_info *find_thread_id (int num);
245
 
246
/* Finds the first thread of the inferior given by PID.  If PID is -1,
247
   returns the first thread in the list.  */
248
struct thread_info *first_thread_of_process (int pid);
249
 
250
/* Returns any thread of process PID.  */
251
extern struct thread_info *any_thread_of_process (int pid);
252
 
253
/* Returns any non-exited thread of process PID, giving preference for
254
   already stopped threads.  */
255
extern struct thread_info *any_live_thread_of_process (int pid);
256
 
257
/* Change the ptid of thread OLD_PTID to NEW_PTID.  */
258
void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);
259
 
260
/* Iterator function to call a user-provided callback function
261
   once for each known thread.  */
262
typedef int (*thread_callback_func) (struct thread_info *, void *);
263
extern struct thread_info *iterate_over_threads (thread_callback_func, void *);
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265
extern int thread_count (void);
266
 
267
/* Switch from one thread to another.  */
268
extern void switch_to_thread (ptid_t ptid);
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270
/* Marks thread PTID is running, or stopped.
271
   If PIDGET (PTID) is -1, marks all threads.  */
272
extern void set_running (ptid_t ptid, int running);
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274
/* Marks or clears thread(s) PTID as having been requested to stop.
275
   If PTID is MINUS_ONE_PTID, applies to all threads.  If
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   ptid_is_pid(PTID) is true, applies to all threads of the process
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   pointed at by PTID.  If STOP, then the THREAD_STOP_REQUESTED
278
   observer is called with PTID as argument.  */
279
extern void set_stop_requested (ptid_t ptid, int stop);
280
 
281
/* NOTE: Since the thread state is not a boolean, most times, you do
282
   not want to check it with negation.  If you really want to check if
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   the thread is stopped,
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285
    use (good):
286
 
287
     if (is_stopped (ptid))
288
 
289
    instead of (bad):
290
 
291
     if (!is_running (ptid))
292
 
293
   The latter also returns true on exited threads, most likelly not
294
   what you want.  */
295
 
296
/* Reports if in the frontend's perpective, thread PTID is running.  */
297
extern int is_running (ptid_t ptid);
298
 
299
/* Is this thread listed, but known to have exited?  We keep it listed
300
   (but not visible) until it's safe to delete.  */
301
extern int is_exited (ptid_t ptid);
302
 
303
/* In the frontend's perpective, is this thread stopped?  */
304
extern int is_stopped (ptid_t ptid);
305
 
306
/* In the frontend's perpective is there any thread running?  */
307
extern int any_running (void);
308
 
309
/* Marks thread PTID as executing, or not.  If PIDGET (PTID) is -1,
310
   marks all threads.
311
 
312
   Note that this is different from the running state.  See the
313
   description of state_ and executing_ fields of struct
314
   thread_info.  */
315
extern void set_executing (ptid_t ptid, int executing);
316
 
317
/* Reports if thread PTID is executing.  */
318
extern int is_executing (ptid_t ptid);
319
 
320
/* Merge the executing property of thread PTID over to its thread
321
   state property (frontend running/stopped view).
322
 
323
   "not executing" -> "stopped"
324
   "executing"     -> "running"
325
   "exited"        -> "exited"
326
 
327
   If PIDGET (PTID) is -1, go over all threads.
328
 
329
   Notifications are only emitted if the thread state did change.  */
330
extern void finish_thread_state (ptid_t ptid);
331
 
332
/* Same as FINISH_THREAD_STATE, but with an interface suitable to be
333
   registered as a cleanup.  PTID_P points to the ptid_t that is
334
   passed to FINISH_THREAD_STATE.  */
335
extern void finish_thread_state_cleanup (void *ptid_p);
336
 
337
/* Commands with a prefix of `thread'.  */
338
extern struct cmd_list_element *thread_cmd_list;
339
 
340
/* Print notices on thread events (attach, detach, etc.), set with
341
   `set print thread-events'.  */
342
extern int print_thread_events;
343
 
344
extern void print_thread_info (struct ui_out *uiout, int thread,
345
                               int pid);
346
 
347
extern struct cleanup *make_cleanup_restore_current_thread (void);
348
 
349
/* Returns a pointer into the thread_info corresponding to
350
   INFERIOR_PTID.  INFERIOR_PTID *must* be in the thread list.  */
351
extern struct thread_info* inferior_thread (void);
352
 
353
extern void update_thread_list (void);
354
 
355
#endif /* GDBTHREAD_H */

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