X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/64ea8dcf1daac53da58d65aa91b7452aae8b13b7..4894cf99d6de1692c325bb49e79e02dbe7a56b8d:/src/msg/msg_io.cpp

diff --git a/src/msg/msg_io.cpp b/src/msg/msg_io.cpp
index b5f2a2b21e..31d0bb17e9 100644
--- a/src/msg/msg_io.cpp
+++ b/src/msg/msg_io.cpp
@@ -4,6 +4,8 @@
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
 
+#include <simgrid/s4u/host.hpp>
+
 #include "msg_private.h"
 #include "xbt/log.h"
 
@@ -92,6 +94,9 @@ sg_size_t MSG_file_read(msg_file_t fd, sg_size_t size)
   msg_file_priv_t file_priv = MSG_file_priv(fd);
   sg_size_t read_size;
 
+  if (file_priv->size == 0.0) /* Nothing to read, return */
+    return 0.0;
+
   /* Find the host where the file is physically located and read it */
   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);
@@ -101,16 +106,16 @@ sg_size_t MSG_file_read(msg_file_t fd, sg_size_t size)
   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, read_size);
-    msg_host_t *m_host_list = NULL;
+    msg_host_t *m_host_list = nullptr;
     m_host_list = (msg_host_t*) 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 flops_amount[] = { 0, 0};
     double bytes_amount[] = { 0, 0, (double)read_size, 0 };
 
     msg_task_t task = MSG_parallel_task_create("file transfer for read", 2, m_host_list, flops_amount, bytes_amount,
-                      NULL);
+                      nullptr);
     msg_error_t transfer = MSG_parallel_task_execute(task);
     MSG_task_destroy(task);
     free(m_host_list);
@@ -137,6 +142,9 @@ sg_size_t MSG_file_write(msg_file_t fd, sg_size_t size)
 {
   msg_file_priv_t file_priv = MSG_file_priv(fd);
 
+  if (size == 0.0) /* Nothing to write, return */
+    return 0.0;
+
   /* 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);
@@ -145,7 +153,7 @@ sg_size_t MSG_file_write(msg_file_t fd, sg_size_t size)
   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;
+    msg_host_t *m_host_list = nullptr;
     m_host_list = (msg_host_t*) calloc(2, sizeof(msg_host_t));
 
     m_host_list[0] = MSG_host_self();
@@ -154,7 +162,7 @@ sg_size_t MSG_file_write(msg_file_t fd, sg_size_t size)
     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);
+                                               nullptr);
     msg_error_t transfer = MSG_parallel_task_execute(task);
     MSG_task_destroy(task);
     free(m_host_list);
@@ -286,7 +294,7 @@ sg_size_t MSG_file_tell(msg_file_t fd)
 }
 
 const char *MSG_file_get_name(msg_file_t fd) {
-  xbt_assert((fd != NULL), "Invalid parameters");
+  xbt_assert((fd != nullptr), "Invalid parameters");
   msg_file_priv_t priv = MSG_file_priv(fd);
   return priv->fullpath;
 }
@@ -323,8 +331,8 @@ msg_error_t MSG_file_rcopy (msg_file_t file, msg_host_t host, const char* fullpa
   read_size = simcall_file_read(file_priv->simdata->smx_file, file_priv->size, attached_host);
 
   /* Find the real host destination where the file will be physically stored */
-  xbt_dict_cursor_t cursor = NULL;
-  msg_storage_t storage_dest = NULL;
+  xbt_dict_cursor_t cursor = nullptr;
+  msg_storage_t storage_dest = nullptr;
   msg_host_t host_dest;
   size_t longest_prefix_length = 0;
 
@@ -357,7 +365,7 @@ msg_error_t MSG_file_rcopy (msg_file_t file, msg_host_t host, const char* fullpa
 
   XBT_DEBUG("Initiate data transfer of %llu bytes between %s and %s.", read_size, storage_priv_src->hostname,
             host_name_dest);
-  msg_host_t *m_host_list = NULL;
+  msg_host_t *m_host_list = nullptr;
   m_host_list = (msg_host_t*) calloc(2, sizeof(msg_host_t));
 
   m_host_list[0] = attached_host;
@@ -366,7 +374,7 @@ msg_error_t MSG_file_rcopy (msg_file_t file, msg_host_t host, const char* fullpa
   double bytes_amount[] = { 0, (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, NULL);
+      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);
   free(m_host_list);
@@ -439,7 +447,7 @@ void __MSG_storage_destroy(msg_storage_priv_t storage) {
  * This functions checks whether a storage is a valid pointer or not and return its name.
  */
 const char *MSG_storage_get_name(msg_storage_t storage) {
-  xbt_assert((storage != NULL), "Invalid parameters");
+  xbt_assert((storage != nullptr), "Invalid parameters");
   return SIMIX_storage_get_name(storage);
 }
 
@@ -468,7 +476,7 @@ sg_size_t MSG_storage_get_used_size(msg_storage_t storage){
  */
 xbt_dict_t MSG_storage_get_properties(msg_storage_t storage)
 {
-  xbt_assert((storage != NULL), "Invalid parameters (storage is NULL)");
+  xbt_assert((storage != nullptr), "Invalid parameters (storage is nullptr)");
   return (simcall_storage_get_properties(storage));
 }
 
@@ -489,7 +497,7 @@ void MSG_storage_set_property_value(msg_storage_t storage, const char *name, cha
  *
  * \param storage a storage
  * \param name a property name
- * \return value of a property (or NULL if property not set)
+ * \return value of a property (or nullptr if property not set)
  */
 const char *MSG_storage_get_property_value(msg_storage_t storage, const char *name)
 {
@@ -513,10 +521,10 @@ xbt_dynar_t MSG_storages_as_dynar(void) {
   xbt_lib_cursor_t cursor;
   char *key;
   void **data;
-  xbt_dynar_t res = xbt_dynar_new(sizeof(msg_storage_t),NULL);
+  xbt_dynar_t res = xbt_dynar_new(sizeof(msg_storage_t),nullptr);
 
   xbt_lib_foreach(storage_lib, cursor, key, data) {
-    if(xbt_lib_get_level(xbt_lib_get_elm_or_null(storage_lib, key), MSG_STORAGE_LEVEL) != NULL) {
+    if(xbt_lib_get_level(xbt_lib_get_elm_or_null(storage_lib, key), MSG_STORAGE_LEVEL) != nullptr) {
       xbt_dictelm_t elm = xbt_dict_cursor_get_elm(cursor);
       xbt_dynar_push(res, &elm);
     }
@@ -544,7 +552,7 @@ msg_error_t MSG_storage_set_data(msg_storage_t storage, void *data)
  */
 void *MSG_storage_get_data(msg_storage_t storage)
 {
-  xbt_assert((storage != NULL), "Invalid parameters");
+  xbt_assert((storage != nullptr), "Invalid parameters");
   msg_storage_priv_t priv = MSG_storage_priv(storage);
   return priv->data;
 }
@@ -578,7 +586,7 @@ sg_size_t MSG_storage_get_size(msg_storage_t storage)
  * This functions checks whether a storage is a valid pointer or not and return its name.
  */
 const char *MSG_storage_get_host(msg_storage_t storage) {
-  xbt_assert((storage != NULL), "Invalid parameters");
+  xbt_assert((storage != nullptr), "Invalid parameters");
   msg_storage_priv_t priv = MSG_storage_priv(storage);
   return priv->hostname;
 }