/* crypto/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>
#include <openssl/opensslconf.h>
#include <openssl/crypto.h>
#ifdef OPENSSL_SYS_WIN32
#include <windows.h>
#else
#ifndef PTHREADS
#define PTHREADS
#endif
#endif

#ifdef LINUX
#include <typedefs.h>
#endif
#ifdef SOLARIS
#include <synch.h>
#include <thread.h>
#undef PTHREADS
#endif
#ifdef IRIX
#include <ulocks.h>
#include <sys/prctl.h>
#undef PTHREADS
#endif

#ifdef PTHREADS
#include <pthread.h>
#endif

#if defined(OPENSSL_THREADS) && \
  (OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))

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

static void irix_thread_id(CRYPTO_THREADID *tid);
static void solaris_thread_id(CRYPTO_THREADID *tid);
static void pthreads_thread_id(CRYPTO_THREADID *tid);
static void netware_thread_id(CRYPTO_THREADID *tid);
static void beos_thread_id(CRYPTO_THREADID *tid);

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

#define THREAD_STACK_SIZE (16*1024)

#ifdef OPENSSL_SYS_WIN32

static void win32_locking_callback(int mode, int type, const char *file, int line);

static HANDLE *lock_cs;

void CRYPTO_thread_setup(void)
{
  int i;

  lock_cs = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(HANDLE));
  for (i = 0; i < CRYPTO_num_locks(); i++)
  {
    lock_cs[i] = CreateMutex(NULL, FALSE, NULL);
  }

  CRYPTO_set_locking_callback(win32_locking_callback);
  /* id callback defined */
}

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);
}

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

#endif /* OPENSSL_SYS_WIN32 */

#ifdef SOLARIS

static void solaris_locking_callback(int mode, int type, const char *file, int line);

#define USE_MUTEX

#ifdef USE_MUTEX
static mutex_t *lock_cs;
#else
static rwlock_t *lock_cs;
#endif
static long *lock_count;

void CRYPTO_thread_setup(void)
{
  int i;

#ifdef USE_MUTEX
  lock_cs = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(mutex_t));
#else
  lock_cs = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(rwlock_t));
#endif
  lock_count = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(long));
  for (i = 0; i < CRYPTO_num_locks(); i++)
  {
    lock_count[i] = 0;
#ifdef USE_MUTEX
    mutex_init(&(lock_cs[i]), USYNC_THREAD, NULL);
#else
    rwlock_init(&(lock_cs[i]), USYNC_THREAD, NULL);
#endif
  }

  CRYPTO_THREADID_set_callback(solaris_thread_id);
  CRYPTO_set_locking_callback(solaris_locking_callback);
}

void CRYPTO_thread_cleanup(void)
{
  int i;

  CRYPTO_set_locking_callback(NULL);
  for (i = 0; i < CRYPTO_num_locks(); i++)
  {
#ifdef USE_MUTEX
    mutex_destroy(&(lock_cs[i]));
#else
    rwlock_destroy(&(lock_cs[i]));
#endif
  }
  OPENSSL_free(lock_cs);
  OPENSSL_free(lock_count);
}

static void solaris_locking_callback(int mode, int type, const char *file, int line)
{
#if 0
  fprintf(stderr, "thread=%4d mode=%s lock=%s %s:%d\n",
          CRYPTO_thread_id(),
          (mode & CRYPTO_LOCK) ? "l" : "u",
          (type & CRYPTO_READ) ? "r" : "w", file, line);
#endif

#if 0
  if (CRYPTO_LOCK_SSL_CERT == type)
    fprintf(stderr, "(t,m,f,l) %ld %d %s %d\n",
            CRYPTO_thread_id(),
            mode, file, line);
#endif
  if (mode & CRYPTO_LOCK)
  {
#ifdef USE_MUTEX
    mutex_lock(&(lock_cs[type]));
#else
    if (mode & CRYPTO_READ)
      rw_rdlock(&(lock_cs[type]));
    else
      rw_wrlock(&(lock_cs[type]));
#endif
    lock_count[type]++;
  }
  else
  {
#ifdef USE_MUTEX
    mutex_unlock(&(lock_cs[type]));
#else
    rw_unlock(&(lock_cs[type]));
#endif
  }
}

void solaris_thread_id(CRYPTO_THREADID *tid)
{
    CRYPTO_THREADID_set_numeric((unsigned long)thr_self());
}
#endif /* SOLARIS */

#ifdef IRIX

static void irix_locking_callback(int mode, int type, const char *file, int line);

/* I don't think this works..... */

static usptr_t *arena;
static usema_t **lock_cs;

void CRYPTO_thread_setup(void)
{
  int i;
  char filename[20];

  strcpy(filename, "/tmp/mttest.XXXXXX");
  mktemp(filename);

  usconfig(CONF_STHREADIOOFF);
  usconfig(CONF_STHREADMALLOCOFF);
  usconfig(CONF_INITUSERS, 100);
  usconfig(CONF_LOCKTYPE, US_DEBUGPLUS);
  arena = usinit(filename);
  unlink(filename);

  lock_cs = OPENSSL_malloc(CRYPTO_num_locks() * sizeof(usema_t *));
  for (i = 0; i < CRYPTO_num_locks(); i++)
  {
    lock_cs[i] = usnewsema(arena, 1);
  }

  CRYPTO_THREADID_set_callback(irix_thread_id);
  CRYPTO_set_locking_callback(irix_locking_callback);
}

void CRYPTO_thread_cleanup(void)
{
  int i;

  CRYPTO_set_locking_callback(NULL);
  for (i = 0; i < CRYPTO_num_locks(); i++)
  {
    char buf[10];

    sprintf(buf, "%2d:", i);
    usdumpsema(lock_cs[i], stdout, buf);
    usfreesema(lock_cs[i], arena);
  }
  OPENSSL_free(lock_cs);
}

static void irix_locking_callback(int mode, int type, char *file, int line)
{
  if (mode & CRYPTO_LOCK)
  {
    uspsema(lock_cs[type]);
  }
  else
  {
    usvsema(lock_cs[type]);
  }
}

unsigned long irix_thread_id(void)
{
    CRYPTO_THREADID_set_numeric((unsigned long)getpid());
}
#endif /* IRIX */

/* Linux and a few others */
#if defined(PTHREADS) && (OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER))
static pthread_mutex_t *lock_cs;
static long *lock_count;


void CRYPTO_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);
}

static void pthreads_locking_callback(int mode, int type, const char *file, int line)
{
#if 0
  fprintf(stderr, "thread=%4d mode=%s lock=%s %s:%d\n",
          CRYPTO_thread_id(),
          (mode & CRYPTO_LOCK) ? "l" : "u",
          (type & CRYPTO_READ) ? "r" : "w", file, line);
#endif
#if 0
  if (CRYPTO_LOCK_SSL_CERT == type)
    fprintf(stderr, "(t,m,f,l) %ld %d %s %d\n",
            CRYPTO_thread_id(),
            mode, file, line);
#endif
  if (mode & CRYPTO_LOCK)
  {
    pthread_mutex_lock(&(lock_cs[type]));
    lock_count[type]++;
  }
  else
  {
    pthread_mutex_unlock(&(lock_cs[type]));
  }
}

static void pthreads_thread_id(CRYPTO_THREADID *tid)
{
    CRYPTO_THREADID_set_numeric(tid, (unsigned long)pthread_self());
}

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));
  for (i = 0; i < CRYPTO_num_locks(); i++)
  {
    lock_count[i] = 0;
    pthread_mutex_init(&(lock_cs[i]), NULL);
  }

  CRYPTO_THREADID_set_callback(pthreads_thread_id);
  CRYPTO_set_locking_callback(pthreads_locking_callback);
}
#endif

#endif