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/* Multi-process/thread control defs for GDB, the GNU debugger.

   Copyright (C) 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1997, 1998, 1999,

   2000, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.

   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 3 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.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef GDBTHREAD_H

#define GDBTHREAD_H

struct symtab;

#include "breakpoint.h"

#include "frame.h"

#include "ui-out.h"

#include "inferior.h"

struct thread_info

{

  struct thread_info *next;

  ptid_t ptid;                  /* "Actual process id";

                                    In fact, this may be overloaded with

                                    kernel thread id, etc.  */

  int num;                      /* Convenient handle (GDB thread id) */

  /* Non-zero means the thread is executing.  Note: this is different

     from saying that there is an active target and we are stopped at

     a breakpoint, for instance.  This is a real indicator whether the

     thread is off and running.  */

  /* This field is internal to thread.c.  Never access it directly,

     use is_executing instead.  */

  int executing_;

  /* Frontend view of the thread state.  Note that the RUNNING/STOPPED

     states are different from EXECUTING.  When the thread is stopped

     internally while handling an internal event, like a software

     single-step breakpoint, EXECUTING will be false, but running will

     still be true.  As a possible future extension, this could turn

     into enum { stopped, exited, stepping, finishing, until(ling),

     running ... }  */

  /* This field is internal to thread.c.  Never access it directly,

     use is_running instead.  */

  int state_;

  /* If this is > 0, then it means there's code out there that relies

     on this thread being listed.  Don't delete it from the lists even

     if we detect it exiting.  */

  int refcount;

  /* User/external stepping state.  */

  /* Step-resume or longjmp-resume breakpoint.  */

  struct breakpoint *step_resume_breakpoint;

  /* Range to single step within.

     If this is nonzero, respond to a single-step signal by continuing

     to step if the pc is in this range.

     If step_range_start and step_range_end are both 1, it means to

     step for a single instruction (FIXME: it might clean up

     wait_for_inferior in a minor way if this were changed to the

     address of the instruction and that address plus one.  But maybe

     not.).  */

  CORE_ADDR step_range_start;   /* Inclusive */

  CORE_ADDR step_range_end;     /* Exclusive */

  /* Stack frame address as of when stepping command was issued.

     This is how we know when we step into a subroutine call, and how

     to set the frame for the breakpoint used to step out.  */

  struct frame_id step_frame_id;

  /* Similarly, the frame ID of the underlying stack frame (skipping

     any inlined frames).  */

  struct frame_id step_stack_frame_id;

  int current_line;

  struct symtab *current_symtab;

  /* Internal stepping state.  */

  /* Record the pc of the thread the last time it stopped.  This is

     maintained by proceed and keep_going, and used in

     adjust_pc_after_break to distinguish a hardware single-step

     SIGTRAP from a breakpoint SIGTRAP.  */

  CORE_ADDR prev_pc;

  /* Nonzero if we are presently stepping over a breakpoint.

     If we hit a breakpoint or watchpoint, and then continue, we need

     to single step the current thread with breakpoints disabled, to

     avoid hitting the same breakpoint or watchpoint again.  And we

     should step just a single thread and keep other threads stopped,

     so that other threads don't miss breakpoints while they are

     removed.

     So, this variable simultaneously means that we need to single

     step the current thread, keep other threads stopped, and that

     breakpoints should be removed while we step.

     This variable is set either:

     - in proceed, when we resume inferior on user's explicit request

     - in keep_going, if handle_inferior_event decides we need to

     step over breakpoint.

     The variable is cleared in normal_stop.  The proceed calls

     wait_for_inferior, which calls handle_inferior_event in a loop,

     and until wait_for_inferior exits, this variable is changed only

     by keep_going.  */

  int trap_expected;

  /* Should we step over breakpoint next time keep_going is called?  */

  int stepping_over_breakpoint;

  /* Set to TRUE if we should finish single-stepping over a breakpoint

     after hitting the current step-resume breakpoint.  */

  int step_after_step_resume_breakpoint;

  /* 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;

  /* Per-thread command support.  */

  /* Pointer to what is left to do for an execution command after the

     target stops.  Used only in asynchronous mode, by targets that

     support async execution.  Several execution commands use it.  */

  struct continuation *continuations;

  /* Similar to the above, but used when a single execution command

     requires several resume/stop iterations.  Used by the step

     command.  */

  struct continuation *intermediate_continuations;

  /* Nonzero if the thread is being proceeded for a "finish" command

     or a similar situation when stop_registers should be saved.  */

  int proceed_to_finish;

  /* Nonzero if the thread is being proceeded for an inferior function

     call.  */

  int in_infcall;

  enum step_over_calls_kind step_over_calls;

  /* Nonzero if stopped due to a step command.  */

  int stop_step;

  /* If stepping, nonzero means step count is > 1 so don't print frame

     next time inferior stops if it stops due to stepping.  */

  int step_multi;

  /* This is used to remember when a fork or vfork event was caught by

     a catchpoint, and thus the event is to be followed at the next

     resume of the thread, and not immediately.  */

  struct target_waitstatus pending_follow;

  /* Last signal that the inferior received (why it stopped).  */

  enum target_signal stop_signal;

  /* Chain containing status of breakpoint(s) the thread stopped

     at.  */

  bpstat stop_bpstat;

  /* True if this thread has been explicitly requested to stop.  */

  int stop_requested;

  /* Private data used by the target vector implementation.  */

  struct private_thread_info *private;

  /* Function that is called to free PRIVATE.  If this is NULL, then

     xfree will be called on PRIVATE.  */

  void (*private_dtor) (struct private_thread_info *);

};

/* Create an empty thread list, or empty the existing one.  */

extern void init_thread_list (void);

/* Add a thread to the thread list, print a message

   that a new thread is found, and return the pointer to

   the new thread.  Caller my use this pointer to

   initialize the private thread data.  */

extern struct thread_info *add_thread (ptid_t ptid);

/* Same as add_thread, but does not print a message

   about new thread.  */

extern struct thread_info *add_thread_silent (ptid_t ptid);

/* Same as add_thread, and sets the private info.  */

extern struct thread_info *add_thread_with_info (ptid_t ptid,

                                                 struct private_thread_info *);

/* Delete an existing thread list entry.  */

extern void delete_thread (ptid_t);

/* Delete an existing thread list entry, and be quiet about it.  Used

   after the process this thread having belonged to having already

   exited, for example.  */

extern void delete_thread_silent (ptid_t);

/* Delete a step_resume_breakpoint from the thread database. */

extern void delete_step_resume_breakpoint (struct thread_info *);

/* Translate the integer thread id (GDB's homegrown id, not the system's)

   into a "pid" (which may be overloaded with extra thread information).  */

extern ptid_t thread_id_to_pid (int);

/* Translate a 'pid' (which may be overloaded with extra thread information)

   into the integer thread id (GDB's homegrown id, not the system's).  */

extern int pid_to_thread_id (ptid_t ptid);

/* Boolean test for an already-known pid (which may be overloaded with

   extra thread information).  */

extern int in_thread_list (ptid_t ptid);

/* Boolean test for an already-known thread id (GDB's homegrown id,

   not the system's).  */

extern int valid_thread_id (int thread);

/* Search function to lookup a thread by 'pid'.  */

extern struct thread_info *find_thread_ptid (ptid_t ptid);

/* Find thread by GDB user-visible thread number.  */

struct thread_info *find_thread_id (int num);

/* Finds the first thread of the inferior given by PID.  If PID is -1,

   returns the first thread in the list.  */

struct thread_info *first_thread_of_process (int pid);

/* Returns any thread of process PID.  */

extern struct thread_info *any_thread_of_process (int pid);

/* Returns any non-exited thread of process PID, giving preference for

   already stopped threads.  */

extern struct thread_info *any_live_thread_of_process (int pid);

/* Change the ptid of thread OLD_PTID to NEW_PTID.  */

void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);

/* Iterator function to call a user-provided callback function

   once for each known thread.  */

typedef int (*thread_callback_func) (struct thread_info *, void *);

extern struct thread_info *iterate_over_threads (thread_callback_func, void *);

extern int thread_count (void);

/* Switch from one thread to another.  */

extern void switch_to_thread (ptid_t ptid);

/* Marks thread PTID is running, or stopped.

   If PIDGET (PTID) is -1, marks all threads.  */

extern void set_running (ptid_t ptid, int running);

/* Marks or clears thread(s) PTID as having been requested to stop.

   If PTID is MINUS_ONE_PTID, applies to all threads.  If

   ptid_is_pid(PTID) is true, applies to all threads of the process

   pointed at by PTID.  If STOP, then the THREAD_STOP_REQUESTED

   observer is called with PTID as argument.  */

extern void set_stop_requested (ptid_t ptid, int stop);

/* NOTE: Since the thread state is not a boolean, most times, you do

   not want to check it with negation.  If you really want to check if

   the thread is stopped,

    use (good):

     if (is_stopped (ptid))

    instead of (bad):

     if (!is_running (ptid))

   The latter also returns true on exited threads, most likelly not

   what you want.  */

/* Reports if in the frontend's perpective, thread PTID is running.  */

extern int is_running (ptid_t ptid);

/* Is this thread listed, but known to have exited?  We keep it listed

   (but not visible) until it's safe to delete.  */

extern int is_exited (ptid_t ptid);

/* In the frontend's perpective, is this thread stopped?  */

extern int is_stopped (ptid_t ptid);

/* In the frontend's perpective is there any thread running?  */

extern int any_running (void);

/* Marks thread PTID as executing, or not.  If PIDGET (PTID) is -1,

   marks all threads.

   Note that this is different from the running state.  See the

   description of state_ and executing_ fields of struct

   thread_info.  */

extern void set_executing (ptid_t ptid, int executing);

/* Reports if thread PTID is executing.  */

extern int is_executing (ptid_t ptid);

/* Merge the executing property of thread PTID over to its thread

   state property (frontend running/stopped view).

   "not executing" -> "stopped"

   "executing"     -> "running"

   "exited"        -> "exited"

   If PIDGET (PTID) is -1, go over all threads.

   Notifications are only emitted if the thread state did change.  */

extern void finish_thread_state (ptid_t ptid);

/* Same as FINISH_THREAD_STATE, but with an interface suitable to be

   registered as a cleanup.  PTID_P points to the ptid_t that is

   passed to FINISH_THREAD_STATE.  */

extern void finish_thread_state_cleanup (void *ptid_p);

/* Commands with a prefix of `thread'.  */

extern struct cmd_list_element *thread_cmd_list;

/* Print notices on thread events (attach, detach, etc.), set with

   `set print thread-events'.  */

extern int print_thread_events;

extern void print_thread_info (struct ui_out *uiout, int thread,

                               int pid);

extern struct cleanup *make_cleanup_restore_current_thread (void);

/* Returns a pointer into the thread_info corresponding to

   INFERIOR_PTID.  INFERIOR_PTID *must* be in the thread list.  */

extern struct thread_info* inferior_thread (void);

extern void update_thread_list (void);

#endif /* GDBTHREAD_H */