<h2>default_pager_object_create</h2>

<strong>Server Interface</strong> - Initialize a non-persistent memory object suitable for sharing between tasks.

<h3>SYNOPSIS</h3>

<strong>kern_return_t default_pager_object_create</strong>

<strong>(mach_port_t</strong> <var>pager</var>,

<strong>memory_object_t</strong> <var>*memory_object</var>,

<strong>vm_size_t</strong> <var>object_size</var><strong>);</strong>

<strong>kern_return_t seqnos_default_pager_object_create</strong>

<strong>(mach_port_t</strong> <var>pager</var>,

<strong>mach_port_seqno_t</strong> <var>seqno</var>,

<strong>memory_object_t</strong> <var>*memory_object</var>,

<strong>vm_size_t</strong> <var>object_size</var><strong>);</strong>

<h3>PARAMETERS</h3>

<dt> <var>pager</var>

[in default-pager (receive) right]

The default memory manager service

port.

<dt> <var>seqno</var>

[in scalar]

The sequence number of this message relative to the <var>pager</var>

port.

<dt> <var>memory_object</var>

[out memory-object send right]

A memory object port (with full access) for the memory object.

<dt> <var>object_size</var>

[in scalar]

The maximum size for the memory object.

<h3>DESCRIPTION</h3>

A <strong>default_pager_object_create</strong> function is called as

the result of a message

requesting that the default memory manager create and return a (shared) memory

object which is suitable for use with <strong>vm_map</strong>. This memory object has

the same properties as does a memory object provided by

<strong>vm_allocate</strong>: its initial

contents are zero and the backing contents are temporary in that they do not

persist after the memory object is destroyed. The memory object

is suitable for use

as non-permanent shared memory. The kernel does not make this call itself

(which is why it can be a synchronous call); this request is only issued by

(privileged) tasks holding the default memory manager port.

This call should be

contrasted with the kernel's <strong>memory_object_create</strong> message, in which

the memory cache object is already created and the identity of the abstract

memory object is made known to the default manager.

<h3>RETURN VALUES</h3>

Only generic errors apply.

<h3>RELATED INFORMATION</h3>

Functions:

<a href="vm_map.html"><strong>vm_map</strong></a>,

<a href="HD_memory_manager.html"><strong>host_default_memory_manager</strong></a>,

<a href="memory_object_create.html"><strong>memory_object_create</strong></a>,

<a href="MO_default_server.html"><strong>memory_object_default_server</strong></a>,

<a href="SMO_default_server.html"><strong>seqnos_memory_object_default_server</strong></a>.