/* The ptid_t type and common functions operating on it.

   Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
   2009, 2010, 2011 Free Software Foundation, Inc.
   
   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/>.  */

#include "ptid.h"

/* Oft used ptids */
ptid_t null_ptid = { 0, 0, 0 };
ptid_t minus_one_ptid = { -1, 0, 0 };

/* Create a ptid given the necessary PID, LWP, and TID components.  */

ptid_t
ptid_build (int pid, long lwp, long tid)
{
  ptid_t ptid;

  ptid.pid = pid;
  ptid.lwp = lwp;
  ptid.tid = tid;
  return ptid;
}

/* Create a ptid from just a pid.  */

ptid_t
pid_to_ptid (int pid)
{
  return ptid_build (pid, 0, 0);
}

/* Fetch the pid (process id) component from a ptid.  */

int
ptid_get_pid (ptid_t ptid)
{
  return ptid.pid;
}

/* Fetch the lwp (lightweight process) component from a ptid.  */

long
ptid_get_lwp (ptid_t ptid)
{
  return ptid.lwp;
}

/* Fetch the tid (thread id) component from a ptid.  */

long
ptid_get_tid (ptid_t ptid)
{
  return ptid.tid;
}

/* ptid_equal() is used to test equality of two ptids.  */

int
ptid_equal (ptid_t ptid1, ptid_t ptid2)
{
  return (ptid1.pid == ptid2.pid
	  && ptid1.lwp == ptid2.lwp
	  && ptid1.tid == ptid2.tid);
}

/* Returns true if PTID represents a process.  */

int
ptid_is_pid (ptid_t ptid)
{
  if (ptid_equal (minus_one_ptid, ptid))
    return 0;
  if (ptid_equal (null_ptid, ptid))
    return 0;

  return (ptid_get_lwp (ptid) == 0 && ptid_get_tid (ptid) == 0);
}