memory_object_change_attributes

Function - Modify caller-specified subset of attributes representing target memory object.

SYNOPSIS

kern_return_t   memory_object_change_attributes
                (memory_object_control_t         memory_control,
                 memory_object_flavor_t                  flavor,
                 memory_object_info_t                attributes,
                 attributes                    attributes_count,
                 mach_port_t                           reply_to);

PARAMETERS

memory_control

[in memory-cache-control send right] The memory cache control port to be used by the memory manager for cache management requests. This port is provided by the kernel in a memory_object_init or memory_object_create call.

flavor

[in scalar] The type of information to be changed. Valid values are:

MEMORY_OBJECT_PERFORMANCE_INFO

Performance related attributes such as the cache indicator and the cluster size. attributes should specify a structure of type memory_object_perf_info.

MEMORY_OBJECT_BEHAVIOR_INFO

Behavior related attributes such as the copy strategy and sync invalidate flag. attributes should specify a structure of type memory_object_behavior_info.

MEMORY_OBJECT_ATTRIBUTES_INFO

Behavior and performance related attributes such as the copy strategy, cache indicator, and cluster size. attributes should specify a structure of type memory_object_attr_info.

attributes

[pointer to in structure] New attributes.

attributes_count

[in scalar] The size of the buffer (in natural-sized units).

reply_port

[in reply receive (to be converted to send) right] A port to which a reply (memory_object_change_completed) is to be sent indicating the completion of the attribute change. Such a reply would be useful if the cache attribute is turned off, since such a change, if the memory object is no longer mapped, may result in the object being terminated.

DESCRIPTION

The memory_object_change_attributes function sets various attributes of the specified memory object.

RETURN VALUES

Only generic errors apply.

RELATED INFORMATION

Functions: memory_object_change_completed, memory_object_get_attributes, memory_object_create.

Data Structures: memory_object_perf_info, memory_object_attr_info.