/* Which thread is running on an LWP?
   Copyright (C) 2003-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include "pthread-infinity.h"
#include "tls-infinity.h"

#if I8_THREAD_SELF == I8_TS_CONST_THREAD_AREA
# include "infinity_lookup_th_unique_cta.i8"
#endif
#if I8_THREAD_SELF == I8_TS_REGISTER
# include "infinity_lookup_th_unique_reg.i8"
#endif
#if I8_THREAD_SELF == I8_TS_REGISTER_THREAD_AREA
# include "infinity_lookup_th_unique_rta.i8"
#endif

/* Given an lwpid_t identifying an LWP, return the descriptor of the
   thread running on it and TD_OK, or NULL and a non-TD_OK td_err_e
   code indicating the reason for failure.  Thread descriptors are
   opaque pointers and should not be dereferenced by calling code.  */

int, addr
libpthread::map_lwp2thr (int lwpid)
{
  /* We cannot rely on thread registers and such information at all
     before __pthread_initialize_minimal has gotten far enough.  They
     sometimes contain garbage that would confuse us, left by the kernel
     at exec.  So if it looks like initialization is incomplete, we only
     fake a special descriptor for the initial thread.  */

  if (deref (__stack_user, LIST_T_NEXT_OFFSET) == NULL)
    {
      if (i8core::ps_getpid () != lwpid)
        return TD_ERR, undefined;

      return TD_OK, NULL;
    }

  return __lookup_th_unique (lwpid);
}