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105 lines
2.8 KiB
105 lines
2.8 KiB
15 years ago
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/* ath-pthread.c - pthread module for self-adapting thread-safeness library
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* Copyright (C) 2002 g10 Code GmbH
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*
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* This file is part of GPGME.
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*
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* GPGME is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GPGME is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <pthread.h>
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#include "ath.h"
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/* Need to include pthread_create in our check, as the GNU C library
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has the pthread_mutex_* functions in their public interface. */
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#pragma weak pthread_create
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#pragma weak pthread_mutex_init
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#pragma weak pthread_mutex_destroy
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#pragma weak pthread_mutex_lock
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#pragma weak pthread_mutex_unlock
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/* The lock we take while checking for lazy lock initialization. */
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static pthread_mutex_t check_init_lock = PTHREAD_MUTEX_INITIALIZER;
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/* Initialize the mutex *PRIV. If JUST_CHECK is true, only do this if
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it is not already initialized. */
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static int
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mutex_pthread_init (void **priv, int just_check)
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{
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int err = 0;
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if (just_check)
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pthread_mutex_lock (&check_init_lock);
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if (!*priv || !just_check)
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{
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pthread_mutex_t *lock = malloc (sizeof (pthread_mutex_t));
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if (!lock)
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err = ENOMEM;
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if (!err)
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{
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err = pthread_mutex_init (lock, NULL);
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if (err)
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free (lock);
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else
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*priv = lock;
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}
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}
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if (just_check)
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pthread_mutex_unlock (&check_init_lock);
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return err;
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}
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static int
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mutex_pthread_destroy (void *priv)
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{
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int err = pthread_mutex_destroy ((pthread_mutex_t *) priv);
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free (priv);
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return err;
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}
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static struct ath_ops ath_pthread_ops =
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{
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mutex_pthread_init,
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mutex_pthread_destroy,
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(int (*) (void *)) pthread_mutex_lock,
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(int (*) (void *)) pthread_mutex_unlock,
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NULL, /* read */
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NULL, /* write */
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NULL, /* select */
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NULL, /* waitpid */
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NULL, /* accept */
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NULL, /* connect */
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NULL, /* sendmsg */
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NULL /* recvmsg */
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};
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struct ath_ops *
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ath_pthread_available (void)
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{
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/* Need to include pthread_create in our check, as the GNU C library
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has the pthread_mutex_* functions in their public interface. */
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if (pthread_create
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&& pthread_mutex_init && pthread_mutex_destroy
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&& pthread_mutex_lock && pthread_mutex_unlock)
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return &ath_pthread_ops;
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else
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return 0;
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}
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