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/* ath-pthread.c - pthread module for 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdlib.h>
#include <errno.h>
#include <pthread.h>
#include "ath.h"
/* Need to include pthread_create in our check, as the GNU C library
has the pthread_mutex_* functions in their public interface. */
#pragma weak pthread_create
#pragma weak pthread_mutex_init
#pragma weak pthread_mutex_destroy
#pragma weak pthread_mutex_lock
#pragma weak pthread_mutex_unlock
/* 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 (void **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 = lock;
}
}
if (just_check)
pthread_mutex_unlock (&check_init_lock);
return err;
}
static int
mutex_pthread_destroy (void *priv)
{
int err = pthread_mutex_destroy ((pthread_mutex_t *) priv);
free (priv);
return err;
}
static struct ath_ops ath_pthread_ops =
{
mutex_pthread_init,
mutex_pthread_destroy,
(int (*) (void *)) pthread_mutex_lock,
(int (*) (void *)) pthread_mutex_unlock,
NULL, /* read */
NULL, /* write */
NULL, /* select */
NULL, /* waitpid */
NULL, /* accept */
NULL, /* connect */
NULL, /* sendmsg */
NULL /* recvmsg */
};
struct ath_ops *
ath_pthread_available (void)
{
/* Need to include pthread_create in our check, as the GNU C library
has the pthread_mutex_* functions in their public interface. */
if (pthread_create
&& pthread_mutex_init && pthread_mutex_destroy
&& pthread_mutex_lock && pthread_mutex_unlock)
return &ath_pthread_ops;
else
return 0;
}
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