/* pthread_mutex_trylock.  Hurd version.

   Copyright (C) 2016-2018 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.h>

#include <stdlib.h>

#include <assert.h>

#include <pt-internal.h>

#include "pt-mutex.h"

#include <hurdlock.h>

int

__pthread_mutex_trylock (pthread_mutex_t *mtxp)

{

  struct __pthread *self;

  int ret;

  switch (MTX_TYPE (mtxp))

    {

    case PT_MTX_NORMAL:

      ret = lll_trylock (&mtxp->__lock);

      if (ret)

	ret = EBUSY;

      break;

    case PT_MTX_RECURSIVE:

      self = _pthread_self ();

      if (mtx_owned_p (mtxp, self, mtxp->__flags))

	{

	  if (__glibc_unlikely (mtxp->__cnt + 1 == 0))

	    return EAGAIN;

	  ++mtxp->__cnt;

	  ret = 0;

	}

      else if ((ret = lll_trylock (&mtxp->__lock)) == 0)

	{

	  mtx_set_owner (mtxp, self, mtxp->__flags);

	  mtxp->__cnt = 1;

	}

      else

	ret = EBUSY;

      break;

    case PT_MTX_ERRORCHECK:

      self = _pthread_self ();

      if ((ret = lll_trylock (&mtxp->__lock)) == 0)

	mtx_set_owner (mtxp, self, mtxp->__flags);

      else

	ret = EBUSY;

      break;

    case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:

    case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:

    case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:

      self = _pthread_self ();

      ROBUST_LOCK (self, mtxp, __lll_robust_trylock);

      break;

    default:

      ret = EINVAL;

      break;

    }

  return ret;

}

strong_alias (__pthread_mutex_trylock, _pthread_mutex_trylock)

strong_alias (__pthread_mutex_trylock, pthread_mutex_trylock)