Document the new behavior

doc/doxygen/chapters/api/codelet_and_tasks.doxy

@@ -450,6 +450,10 @@ should either define this field or the field starpu_task::modes defined above.
 Optional pointer which is passed to the codelet through the second
 argument of the codelet implementation (e.g. starpu_codelet::cpu_func
 or starpu_codelet::cuda_func). The default value is <c>NULL</c>.
+starpu_codelet_pack_args() and starpu_codelet_unpack_args() are helpers that can
+can be used to respectively pack and unpack data into and from it, but the
+application can manage it any way, the only requirement is that the size of the
+data must be set in starpu_task:cl_arg_size .
 
 \var size_t starpu_task::cl_arg_size
 Optional field. For some specific drivers, the pointer

doc/doxygen/chapters/api/insert_task.doxy

@@ -131,7 +131,9 @@ starpu_codelet_unpack_args().
 \fn void starpu_codelet_unpack_args(void *cl_arg, ...)
 \ingroup API_Insert_Task
 Retrieve the arguments of type ::STARPU_VALUE associated to a
-task automatically created using the function starpu_task_insert().
+task automatically created using the function starpu_task_insert(). If
+some parameter is NULL, unpacking will stop there and ignore the remaining
+parameters.
 
 \fn struct starpu_task *starpu_task_build(struct starpu_codelet *cl, ...)
 \ingroup API_Insert_Task

src/util/starpu_task_insert.c

@@ -1,6 +1,6 @@
 /* StarPU --- Runtime system for heterogeneous multicore architectures.
  *
- * Copyright (C) 2010, 2012, 2014-2015  Université de Bordeaux
+ * Copyright (C) 2010, 2012, 2014-2016  Université de Bordeaux
  * Copyright (C) 2011, 2012, 2013, 2014, 2015  CNRS
  *
  * StarPU is free software; you can redistribute it and/or modify
@@ -50,7 +50,7 @@ void starpu_codelet_unpack_args(void *_cl_arg, ...)
 	{
 		void *argptr = va_arg(varg_list, void *);
 
-		// If not reading all cl_args
+		/* If not reading all cl_args */
 		if(argptr == NULL)
 			break;