예제 #1
0
파일: msg_io.c 프로젝트: FlorianPO/simgrid
/** \ingroup msg_file_management
 * \brief Write into a file (local or remote)
 *
 * \param size of the file to write
 * \param fd is a the file descriptor
 * \return the number of bytes successfully write or -1 if an error occurred
 */
sg_size_t MSG_file_write(msg_file_t fd, sg_size_t size)
{
  msg_file_priv_t file_priv = MSG_file_priv(fd);
  sg_size_t write_size, offset;

  /* Find the host where the file is physically located (remote or local)*/
  msg_storage_t storage_src =(msg_storage_t) xbt_lib_get_elm_or_null(storage_lib, file_priv->storageId);
  msg_storage_priv_t storage_priv_src = MSG_storage_priv(storage_src);
  msg_host_t attached_host = MSG_get_host_by_name(storage_priv_src->hostname);

  if(strcmp(storage_priv_src->hostname, MSG_host_get_name(MSG_host_self()))){
    /* the file is hosted on a remote host, initiate a communication between src and dest hosts for data transfer */
    XBT_DEBUG("File is on %s remote host, initiate data transfer of %llu bytes.", storage_priv_src->hostname, size);
    msg_host_t *m_host_list = NULL;
    m_host_list = calloc(2, sizeof(msg_host_t));

    m_host_list[0] = MSG_host_self();
    m_host_list[1] = attached_host;
    double flops_amount[] = { 0, 0 };
    double bytes_amount[] = { 0, (double)size, 0, 0 };

    msg_task_t task = MSG_parallel_task_create("file transfer for write", 2, m_host_list, flops_amount, bytes_amount, NULL);
    msg_error_t transfer = MSG_parallel_task_execute(task);
    MSG_task_destroy(task);
    free(m_host_list);
    if(transfer != MSG_OK){
      if (transfer == MSG_HOST_FAILURE)
        XBT_WARN("Transfer error, %s remote host just turned off!", MSG_host_get_name(attached_host));
      if (transfer == MSG_TASK_CANCELED)
        XBT_WARN("Transfer error, task has been canceled!");

      return -1;
    }
  }
  /* Write file on local or remote host */
  offset = simcall_file_tell(file_priv->simdata->smx_file);
  write_size = simcall_file_write(file_priv->simdata->smx_file, size, attached_host);
  file_priv->size = offset+write_size;

  return write_size;
}
예제 #2
0
sg_size_t File::write(sg_size_t size) {
	return simcall_file_write(p_inferior,size, Host::current()->inferior());
}