static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
{
  int ret;
  /* lock 1 = entropy_func_mutex() */
  Curl_mbedtlsthreadlock_lock_function(1);
  ret = mbedtls_entropy_func(data, output, len);
  Curl_mbedtlsthreadlock_unlock_function(1);

  return ret;
}
static int entropy_func_mutex(void *data, unsigned char *output, size_t len)
{
  int ret;
   
  Curl_mbedtlsthreadlock_lock_function(1);
  ret = mbedtls_entropy_func(data, output, len);
  Curl_mbedtlsthreadlock_unlock_function(1);

  return ret;
}