default_pager_object_create

Server Interface - Initialize a non-persistent memory object suitable for sharing between tasks.

SYNOPSIS

kern_return_t   default_pager_object_create
                (mach_port_t                              pager,
                 memory_object_t                 *memory_object,
                 vm_size_t                          object_size);


kern_return_t   seqnos_default_pager_object_create
                (mach_port_t                              pager,
                 mach_port_seqno_t                        seqno,
                 memory_object_t                 *memory_object,
                 vm_size_t                          object_size);

PARAMETERS

pager

[in default-pager (receive) right] The default memory manager service port.

seqno

[in scalar] The sequence number of this message relative to the pager port.

memory_object

[out memory-object send right] A memory object port (with full access) for the memory object.

object_size

[in scalar] The maximum size for the memory object.

DESCRIPTION

A default_pager_object_create 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 vm_map. This memory object has the same properties as does a memory object provided by vm_allocate: 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 memory_object_create 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.

RETURN VALUES

Only generic errors apply.

RELATED INFORMATION

Functions: vm_map, host_default_memory_manager, memory_object_create, memory_object_default_server, seqnos_memory_object_default_server.