openssl/demos/threads/th-lock.c

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef LINUX
# include <typedefs.h>
#endif
#ifdef OPENSSL_SYS_WIN32
# include <windows.h>
#endif
#ifdef PTHREADS
# include <pthread.h>
#endif
#include <openssl/lhash.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include "../../e_os.h"
#include <openssl/x509.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

void CRYPTO_thread_setup(void);
void CRYPTO_thread_cleanup(void);

static void win32_locking_callback(int mode, int type, char *file, int line);
static void pthreads_locking_callback(int mode, int type, char *file, int line);
static unsigned long pthreads_thread_id(void);

/*-
 * usage:
 * CRYPTO_thread_setup();
 * application code
 * CRYPTO_thread_cleanup();
 */

#ifdef OPENSSL_SYS_WIN32

static HANDLE *lock_cs;

void CRYPTO_thread_setup(void)
{
    int i;

    lock_cs = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(HANDLE));
    if (!lock_cs) {
        /* Nothing we can do about this...void function! */
        return;
    }
    for (i = 0; i < CRYPTO_num_locks(); i++) {
        lock_cs[i] = CreateMutex(NULL, FALSE, NULL);
    }

    CRYPTO_set_locking_callback((void (*)(int, int, char *, int))
                                win32_locking_callback);
    /* id callback defined */
    return (1);
}

static void CRYPTO_thread_cleanup(void)
{
    int i;

    CRYPTO_set_locking_callback(NULL);
    for (i = 0; i < CRYPTO_num_locks(); i++)
        CloseHandle(lock_cs[i]);
    OPENSSL_free(lock_cs);
}

void win32_locking_callback(int mode, int type, char *file, int line)
{
    if (mode & CRYPTO_LOCK) {
        WaitForSingleObject(lock_cs[type], INFINITE);
    } else {
        ReleaseMutex(lock_cs[type]);
    }
}

#endif                          /* OPENSSL_SYS_WIN32 */

/* Linux and a few others */
#ifdef PTHREADS

static pthread_mutex_t *lock_cs;
static long *lock_count;

void CRYPTO_thread_setup(void)
{
    int i;

    lock_cs = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t));
    lock_count = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(long));
    if (!lock_cs || !lock_count) {
        /* Nothing we can do about this...void function! */
        OPENSSL_free(lock_cs);
        OPENSSL_free(lock_count);
        return;
    }
    for (i = 0; i < CRYPTO_num_locks(); i++) {
        lock_count[i] = 0;
        pthread_mutex_init(&(lock_cs[i]), NULL);
    }

    CRYPTO_set_id_callback((unsigned long (*)())pthreads_thread_id);
    CRYPTO_set_locking_callback((void (*)())pthreads_locking_callback);
}

void thread_cleanup(void)
{
    int i;

    CRYPTO_set_locking_callback(NULL);
    for (i = 0; i < CRYPTO_num_locks(); i++) {
        pthread_mutex_destroy(&(lock_cs[i]));
    }
    OPENSSL_free(lock_cs);
    OPENSSL_free(lock_count);
}

void pthreads_locking_callback(int mode, int type, char *file, int line)
{
    if (mode & CRYPTO_LOCK) {
        pthread_mutex_lock(&(lock_cs[type]));
        lock_count[type]++;
    } else {
        pthread_mutex_unlock(&(lock_cs[type]));
    }
}

unsigned long pthreads_thread_id(void)
{
    unsigned long ret;

    ret = (unsigned long)pthread_self();
    return (ret);
}

#endif                          /* PTHREADS */