extern "C" {
-/** @addtogroup msg_file
- * (#msg_file_t) and the functions for managing it.
- *
- * \see #msg_file_t
- */
-
-static int MSG_host_get_file_descriptor_id(msg_host_t host)
-{
- simgrid::MsgHostExt* priv = host->extension<simgrid::MsgHostExt>();
- if (priv->file_descriptor_table == nullptr) {
- priv->file_descriptor_table = new std::vector<int>(sg_storage_max_file_descriptors);
- std::iota(priv->file_descriptor_table->rbegin(), priv->file_descriptor_table->rend(), 0); // Fill with ..., 1, 0.
- }
- xbt_assert(not priv->file_descriptor_table->empty(), "Too much files are opened! Some have to be closed.");
- int desc = priv->file_descriptor_table->back();
- priv->file_descriptor_table->pop_back();
- return desc;
-}
-
-static void MSG_host_release_file_descriptor_id(msg_host_t host, int id)
-{
- host->extension<simgrid::MsgHostExt>()->file_descriptor_table->push_back(id);
-}
-
-/** \ingroup msg_file
- * \brief Read a file (local or remote)
- *
- * \param size of the file to read
- * \param fd is a the file descriptor
- * \return the number of bytes successfully read or -1 if an error occurred
- */
-sg_size_t MSG_file_read(msg_file_t fd, sg_size_t size)
-{
- sg_size_t read_size;
-
- if (fd->size() == 0) /* Nothing to read, return */
- return 0;
-
- /* Find the host where the file is physically located and read it */
- msg_storage_t storage_src = fd->localStorage;
- msg_host_t attached_host = storage_src->getHost();
- read_size = fd->read(size);
-
- if (strcmp(attached_host->getCname(), MSG_host_self()->getCname())) {
- /* 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.", attached_host->getCname(), read_size);
- msg_host_t m_host_list[] = {MSG_host_self(), attached_host};
- double flops_amount[] = {0, 0};
- double bytes_amount[] = {0, 0, static_cast<double>(read_size), 0};
-
- msg_task_t task = MSG_parallel_task_create("file transfer for read", 2, m_host_list, flops_amount, bytes_amount,
- nullptr);
- msg_error_t transfer = MSG_parallel_task_execute(task);
- MSG_task_destroy(task);
-
- if(transfer != MSG_OK){
- if (transfer == MSG_HOST_FAILURE)
- XBT_WARN("Transfer error, %s remote host just turned off!", attached_host->getCname());
- if (transfer == MSG_TASK_CANCELED)
- XBT_WARN("Transfer error, task has been canceled!");
-
- return -1;
- }
- }
- return read_size;
-}
-
-/** \ingroup msg_file
- * \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)
-{
- if (size == 0) /* Nothing to write, return */
- return 0;
-
- /* Find the host where the file is physically located (remote or local)*/
- msg_storage_t storage_src = fd->localStorage;
- msg_host_t attached_host = storage_src->getHost();
-
- if (strcmp(attached_host->getCname(), MSG_host_self()->getCname())) {
- /* 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.", attached_host->getCname(), size);
- msg_host_t m_host_list[] = {MSG_host_self(), attached_host};
- double flops_amount[] = {0, 0};
- double bytes_amount[] = {0, static_cast<double>(size), 0, 0};
-
- msg_task_t task = MSG_parallel_task_create("file transfer for write", 2, m_host_list, flops_amount, bytes_amount,
- nullptr);
- msg_error_t transfer = MSG_parallel_task_execute(task);
- MSG_task_destroy(task);
-
- if(transfer != MSG_OK){
- if (transfer == MSG_HOST_FAILURE)
- XBT_WARN("Transfer error, %s remote host just turned off!", attached_host->getCname());
- if (transfer == MSG_TASK_CANCELED)
- XBT_WARN("Transfer error, task has been canceled!");
-
- return -1;
- }
- }
- /* Write file on local or remote host */
- sg_size_t write_size = fd->write(size);
-
- return write_size;
-}
-
-/** \ingroup msg_file
- * \brief Opens the file whose name is the string pointed to by path
- *
- * \param fullpath is the file location on the storage
- * \param data user data to attach to the file
- *
- * \return An #msg_file_t associated to the file
- */
-msg_file_t MSG_file_open(const char* fullpath, void* data)
-{
- msg_file_t fd = new simgrid::s4u::File(fullpath, MSG_host_self());
- fd->desc_id = MSG_host_get_file_descriptor_id(MSG_host_self());
- fd->setUserdata(data);
- return fd;
-}
-
-/** \ingroup msg_file
- * \brief Close the file
- *
- * \param fd is the file to close
- * \return 0 on success or 1 on error
- */
-int MSG_file_close(msg_file_t fd)
-{
- MSG_host_release_file_descriptor_id(MSG_host_self(), fd->desc_id);
- delete fd;
-
- return MSG_OK;
-}
-
-/**
- * \ingroup msg_file
- * \brief Copy a file to another location on a remote host.
- * \param file : the file to move
- * \param host : the remote host where the file has to be copied
- * \param fullpath : the complete path destination on the remote host
- * \return If successful, the function returns MSG_OK. Otherwise, it returns MSG_TASK_CANCELED.
- */
-msg_error_t MSG_file_rcopy (msg_file_t file, msg_host_t host, const char* fullpath)
-{
- /* Find the host where the file is physically located and read it */
- msg_storage_t storage_src = file->localStorage;
- msg_host_t src_host = storage_src->getHost();
- MSG_file_seek(file, 0, SEEK_SET);
- sg_size_t read_size = file->read(file->size());
-
- /* Find the host that owns the storage where the file has to be copied */
- msg_storage_t storage_dest = nullptr;
- msg_host_t dst_host;
- size_t longest_prefix_length = 0;
-
- for (auto const& elm : host->getMountedStorages()) {
- std::string mount_point = std::string(fullpath).substr(0, elm.first.size());
- if (mount_point == elm.first && elm.first.length() > longest_prefix_length) {
- /* The current mount name is found in the full path and is bigger than the previous*/
- longest_prefix_length = elm.first.length();
- storage_dest = elm.second;
- }
- }
-
- if (storage_dest != nullptr) {
- /* Mount point found, retrieve the host the storage is attached to */
- dst_host = storage_dest->getHost();
- }else{
- XBT_WARN("Can't find mount point for '%s' on destination host '%s'", fullpath, host->getCname());
- return MSG_TASK_CANCELED;
- }
-
- XBT_DEBUG("Initiate data transfer of %llu bytes between %s and %s.", read_size, src_host->getCname(),
- storage_dest->getHost()->getCname());
- msg_host_t m_host_list[] = {src_host, dst_host};
- double flops_amount[] = {0, 0};
- double bytes_amount[] = {0, static_cast<double>(read_size), 0, 0};
-
- msg_task_t task =
- MSG_parallel_task_create("file transfer for write", 2, m_host_list, flops_amount, bytes_amount, nullptr);
- msg_error_t err = MSG_parallel_task_execute(task);
- MSG_task_destroy(task);
-
- if (err != MSG_OK) {
- if (err == MSG_HOST_FAILURE)
- XBT_WARN("Transfer error, %s remote host just turned off!", storage_dest->getHost()->getCname());
- if (err == MSG_TASK_CANCELED)
- XBT_WARN("Transfer error, task has been canceled!");
-
- return err;
- }
-
- /* Create file on remote host, write it and close it */
- msg_file_t fd = new simgrid::s4u::File(fullpath, dst_host, nullptr);
- fd->write(read_size);
- delete fd;
- return MSG_OK;
-}
-
-/**
- * \ingroup msg_file
- * \brief Move a file to another location on a remote host.
- * \param file : the file to move
- * \param host : the remote host where the file has to be moved
- * \param fullpath : the complete path destination on the remote host
- * \return If successful, the function returns MSG_OK. Otherwise, it returns MSG_TASK_CANCELED.
- */
-msg_error_t MSG_file_rmove (msg_file_t file, msg_host_t host, const char* fullpath)
-{
- msg_error_t res = MSG_file_rcopy(file, host, fullpath);
- MSG_file_unlink(file);
- return res;
-}
-
/********************************* Storage **************************************/
/** @addtogroup msg_storage_management
* (#msg_storage_t) and the functions for managing it.
