make an error message informative

[simgrid.git] / src / msg / msg_task.c

diff --git a/src/msg/msg_task.c b/src/msg/msg_task.c
index b280a7c..013c4f1 100644 (file)
--- a/src/msg/msg_task.c
+++ b/src/msg/msg_task.c
@@ -298,7 +298,7 @@ msg_error_t MSG_task_destroy(msg_task_t task)
  */
 msg_error_t MSG_task_cancel(msg_task_t task)
 {
-  xbt_assert((task != NULL), "Invalid parameter");
+  xbt_assert((task != NULL), "Cannot cancel a NULL task");
 
   if (task->simdata->compute) {
     simcall_host_execution_cancel(task->simdata->compute);