/* ath.c - self-adapting thread-safeness library
 *      Copyright (C) 2002 g10 Code GmbH
 *
 * This file is part of GPGME.
 *
 * GPGME 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 2 of the License, or
 * (at your option) any later version.
 *
 * GPGME 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <unistd.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/wait.h>

#include "ath.h"

static struct ath_ops *ath_ops;

void
ath_init (void)
{
#ifdef HAVE_PTHREAD
  if (!ath_ops)
    ath_ops = ath_pthread_available ();
#endif
#ifdef HAVE_PTH
  if (!ath_ops)
    ath_ops = ath_pth_available ();
#endif
#ifdef HAVE_ATH_DUMMY
  if (!ath_ops)
    ath_ops = ath_dummy_available ();
#endif
}


int
ath_mutex_init (ath_mutex_t *lock)
{
  if (!ath_ops)
    return 0;

  return ath_ops->mutex_init (lock, 0);
}


int
ath_mutex_destroy (ath_mutex_t *lock)
{
  int err;
  if (!ath_ops)
    return 0;
  err = ath_ops->mutex_init (lock, 1);
  if (!err)
    err = ath_ops->mutex_destroy (*lock);
  return err;
}


int
ath_mutex_lock (ath_mutex_t *lock)
{
  int err;

  if (!ath_ops)
    return 0;
  err = ath_ops->mutex_init (lock, 1);
  if (!err)
    err = ath_ops->mutex_lock (*lock);
  return err;
}


int
ath_mutex_unlock (ath_mutex_t *lock)
{
  int err;

  if (!ath_ops)
    return 0;
  err = ath_ops->mutex_init (lock, 1);
  if (!err)
    err = ath_ops->mutex_unlock (*lock);
  return err;
}


ssize_t
ath_read (int fd, void *buf, size_t nbytes)
{
  if (ath_ops && ath_ops->read)
    return ath_ops->read (fd, buf, nbytes);
  else
    return read (fd, buf, nbytes);
}


ssize_t
ath_write (int fd, const void *buf, size_t nbytes)
{
  if (ath_ops && ath_ops->write)
    return ath_ops->write (fd, buf, nbytes);
  else
    return write (fd, buf, nbytes);
}


ssize_t
ath_select (int nfd, fd_set *rset, fd_set *wset, fd_set *eset,
	    struct timeval *timeout)
{
  if (ath_ops && ath_ops->select)
    return ath_ops->select (nfd, rset, wset, eset, timeout);
  else
    return select (nfd, rset, wset, eset, timeout);
}

 
ssize_t
ath_waitpid (pid_t pid, int *status, int options)
{
  if (ath_ops && ath_ops->waitpid)
    return ath_ops->waitpid (pid, status, options);
  else
    return waitpid (pid, status, options);
}