/* ath-pthread.c - pthread module for self-adapting thread-safeness library
   Copyright (C) 2002, 2003, 2004 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 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.
   
   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
   Lesser General Public License for more details.
   
   You should have received a copy of the GNU Lesser General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.  */

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

#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#else
# include <sys/time.h>
#endif
#include <sys/types.h>
#include <sys/wait.h>

#include <pthread.h>

#include "ath.h"


/* The lock we take while checking for lazy lock initialization.  */
static pthread_mutex_t check_init_lock = PTHREAD_MUTEX_INITIALIZER;

/* Initialize the mutex *PRIV.  If JUST_CHECK is true, only do this if
   it is not already initialized.  */
static int
mutex_pthread_init (ath_mutex_t *priv, int just_check)
{
  int err = 0;

  if (just_check)
    pthread_mutex_lock (&check_init_lock);
  if (!*priv || !just_check)
    {
      pthread_mutex_t *lock = malloc (sizeof (pthread_mutex_t));
      if (!lock)
	err = ENOMEM;
      if (!err)
	{
	  err = pthread_mutex_init (lock, NULL);
	  if (err)
	    free (lock);
	  else
	    *priv = (ath_mutex_t) lock;
	}
    }
  if (just_check)
    pthread_mutex_unlock (&check_init_lock);
  return err;
}


void
ath_init (void)
{
  /* Nothing to do.  */
}


int
ath_mutex_init (ath_mutex_t *lock)
{
  return mutex_pthread_init (lock, 0);
}


int
ath_mutex_destroy (ath_mutex_t *lock)
{
  int err = mutex_pthread_init (lock, 1);
  if (!err)
    {
      err = pthread_mutex_destroy ((pthread_mutex_t *) *lock);
      free (*lock);
    }
  return err;
}


int
ath_mutex_lock (ath_mutex_t *lock)
{
  int ret = mutex_pthread_init (lock, 1);
  if (ret)
    return ret;

  return pthread_mutex_lock ((pthread_mutex_t *) *lock);
}


int
ath_mutex_unlock (ath_mutex_t *lock)
{
  int ret = mutex_pthread_init (lock, 1);
  if (ret)
    return ret;

  return pthread_mutex_unlock ((pthread_mutex_t *) *lock);
}


ssize_t
ath_read (int fd, void *buf, size_t nbytes)
{
  return read (fd, buf, nbytes);
}


ssize_t
ath_write (int fd, const void *buf, size_t nbytes)
{
  return write (fd, buf, nbytes);
}


ssize_t
ath_select (int nfd, fd_set *rset, fd_set *wset, fd_set *eset,
	    struct timeval *timeout)
{
  return select (nfd, rset, wset, eset, timeout);
}

 
ssize_t
ath_waitpid (pid_t pid, int *status, int options)
{
  return waitpid (pid, status, options);
}


int
ath_accept (int s, struct sockaddr *addr, socklen_t *length_ptr)
{
  return accept (s, addr, length_ptr);
}


int
ath_connect (int s, const struct sockaddr *addr, socklen_t length)
{
  return connect (s, addr, length);
}

int
ath_sendmsg (int s, const struct msghdr *msg, int flags)
{
  return sendmsg (s, msg, flags);
}


int
ath_recvmsg (int s, struct msghdr *msg, int flags)
{
  return recvmsg (s, msg, flags);
}
