port_vmem.h File Reference

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Detailed Description

Virtual memory support.

Functions to manipulate memory pages in virtual address space: reserve, de/commit, free, control size and access protection of pages.

Defines
#define	PORT_VMEM_MODE_READ   0x1
	Enabling read access to the committed memory region.
#define	PORT_VMEM_MODE_WRITE   0x2
	Enabling write access to the committed memory region.
#define	PORT_VMEM_MODE_EXECUTE   0x4
	Enabling read access to the committed memory region.
#define	PORT_VMEM_PAGESIZE_DEFAULT   0
	System default page size.
#define	PORT_VMEM_PAGESIZE_LARGE   1
	Large page (if supported by system).
Typedefs
typedef port_vmem_t	port_vmem_t
	Virtual memory block descriptor.
Functions
apr_status_t	port_vmem_reserve (port_vmem_t **block, void **address, size_t amount, unsigned int protectionMode, size_t pageSize, apr_pool_t *pool)
	Reserves a continuous memory region in the virtual address space of the calling process.
apr_status_t	port_vmem_commit (void **address, size_t amount, port_vmem_t *block)
	Commits (a part of) the previously reserved memory region.
apr_status_t	port_vmem_decommit (void *address, size_t amount, port_vmem_t *block)
	Decommits the specified region of committed memory.
apr_status_t	port_vmem_release (port_vmem_t *block)
	Releases previously reserved virtual memory region as a whole.
size_t *	port_vmem_page_sizes ()
	Returns a zero-terminated array of supported memory page sizes.
size_t	port_vmem_used_size ()
	Returns the amount of currently used memory in bytes or 0 if this value could not be calculated.
size_t	port_vmem_committed_size ()
	Returns the amount of committed memory in bytes or 0 if this value could not be calculated.
size_t	port_vmem_reserved_size ()
	Returns the amount of reserved memory in bytes or 0 if this value could not be calculated.
size_t	port_vmem_max_size ()
	Returns the maximum amount of memory which could be reserved in bytes or 0 if this value could not be calculated.
apr_status_t	port_vmem_allocate (void **addr, size_t size, unsigned int mode)
	Allocate memory with default page size.
apr_status_t	port_vmem_free (void *addr, size_t size)
	Releases previously reserved virtual memory region as a whole.

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