text: /*
   * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <openssl/crypto.h>
  #include "internal/cryptlib.h"
  
  #if !defined(OPENSSL_THREADS) || defined(CRYPTO_TDEBUG)
  
  CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
  {
      CRYPTO_RWLOCK *lock;
  
      if ((lock = OPENSSL_zalloc(sizeof(unsigned int))) == NULL) {
          /* Don't set error, to avoid recursion blowup. */
          return NULL;
      }
  
      *(unsigned int *)lock = 1;
  
      return lock;
  }
  
  int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
  {
      if (!ossl_assert(*(unsigned int *)lock == 1))
          return 0;
      return 1;
  }
  
  int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
  {
      if (!ossl_assert(*(unsigned int *)lock == 1))
          return 0;
      return 1;
  }
  
  int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
  {
      if (!ossl_assert(*(unsigned int *)lock == 1))
          return 0;
      return 1;
  }
  
  void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock) {
      if (lock == NULL)
          return;
  
      *(unsigned int *)lock = 0;
      OPENSSL_free(lock);
  
      return;
  }
  
  int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
  {
      if (*once != 0)
          return 1;
  
      init();
      *once = 1;
  
      return 1;
  }
  
  #define OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX 256
  
  static void *thread_local_storage[OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX];
  
  int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
  {
      static unsigned int thread_local_key = 0;
  
      if (thread_local_key >= OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX)
          return 0;
  
      *key = thread_local_key++;
  
      thread_local_storage[*key] = NULL;
  
      return 1;
  }
  
  void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
  {
      if (*key >= OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX)
          return NULL;
  
      return thread_local_storage[*key];
  }
  
  int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
  {
      if (*key >= OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX)
          return 0;
  
      thread_local_storage[*key] = val;
  
      return 1;
  }
  
  int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
  {
      *key = OPENSSL_CRYPTO_THREAD_LOCAL_KEY_MAX + 1;
      return 1;
  }
  
  CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
  {
      return 0;
  }
  
  int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
  {
      return (a == b);
  }
  
  int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
  {
      *val += amount;
      *ret  = *val;
  
      return 1;
  }
  
  int CRYPTO_atomic_read(int *val, int *ret, CRYPTO_RWLOCK *lock)
  {
      *ret = *val;
      return 1;
  }
  
  int CRYPTO_atomic_write(int *val, int n, CRYPTO_RWLOCK *lock)
  {
      *val = n;
      return 1;
  }
  
  int openssl_init_fork_handlers(void)
  {
      return 0;
  }
  
  #endif
  