backend/mmapcache.c File Reference

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Detailed Description

Definition in file mmapcache.c.

#include "include/logging.h"
#include "lib/safeclib.h"
#include "backend/mmapcache.h"

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Functions
void	lumiera_mmapcache_announce (LumieraMMap map)
	Announce a new mmap object to the cache quotas.
void	lumiera_mmapcache_checkin (LumieraMMap handle)
	Put a mmap into the cache Mmaps which are checked in are subject of cache aging and might get destroyed and reused.
LumieraMMap	lumiera_mmapcache_checkout (LumieraMMap handle)
	Remove a mmap from cache aging Mmaps which are subject of cache aging must be checked out before they can be used.
void	lumiera_mmapcache_delete (void)
	Delete the mmap cache.
void	lumiera_mmapcache_forget (LumieraMMap map)
	Remove a mmap object from the cache quotas.
void *	lumiera_mmapcache_mmap_acquire (void)
	Get a fresh mmap object.
void	lumiera_mmapcache_new (size_t limit)
	Initializes the mmapcache.
Variables
LumieraMMapcache	lumiera_mcache = NULL

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Function Documentation

void lumiera_mmapcache_new

(

size_t

limit

)

Initializes the mmapcache.

Parameters:

limit

the mmapcache will drop elements when the sum of all mmapings gives over limit

Definition at line 38 of file mmapcache.c.

References lumiera_mutex_init().

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void lumiera_mmapcache_delete

(

void

)

Delete the mmap cache.

No mmaps in the cache must be locked, this would be a fatal error. The handles are closed automatically.

Definition at line 54 of file mmapcache.c.

References lumiera_mutex_destroy().

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void* lumiera_mmapcache_mmap_acquire

(

void

)

Get a fresh mmap object.

when mmaped_limit is reached, the oldest mmap object gets dropped else a new allocated object is returned

Returns:

the new uninitialized mmap (void* because this is uninitialized)

Definition at line 69 of file mmapcache.c.

References lumiera_mrucache_pop(), and LUMIERA_MUTEX_SECTION.

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void lumiera_mmapcache_announce

(

LumieraMMap

map

)

Announce a new mmap object to the cache quotas.

Update the statistics kept in the cache, the map object is still considered to be checked out

Parameters:

map

object to be announced

Definition at line 94 of file mmapcache.c.

References LUMIERA_MUTEX_SECTION, and lumiera_mmap_struct::size.

Referenced by lumiera_mmap_init(), and lumiera_mmap_init_exact().

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void lumiera_mmapcache_forget

(

LumieraMMap

map

)

Remove a mmap object from the cache quotas.

Update the statistics kept in the cache, remove it from the cache.

Parameters:

map

object to be removed

Definition at line 105 of file mmapcache.c.

References lumiera_mmap_struct::cachenode, LUMIERA_MUTEX_SECTION, and lumiera_mmap_struct::size.

LumieraMMap lumiera_mmapcache_checkout

(

LumieraMMap

handle

)

Remove a mmap from cache aging Mmaps which are subject of cache aging must be checked out before they can be used.

Parameters:

handle

the mmap to be checked out

Definition at line 137 of file mmapcache.c.

References lumiera_mmap_struct::cachenode, lumiera_mrucache_checkout(), LUMIERA_MUTEX_SECTION, and lumiera_mmap_struct::refcnt.

Referenced by lumiera_mmapings_mmap_acquire().

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void lumiera_mmapcache_checkin

(

LumieraMMap

handle

)

Put a mmap into the cache Mmaps which are checked in are subject of cache aging and might get destroyed and reused.

Parameters:

handle

the mmap to be checked in

Definition at line 153 of file mmapcache.c.

References lumiera_mmap_struct::cachenode, lumiera_mrucache_checkin(), LUMIERA_MUTEX_SECTION, and lumiera_mmap_struct::refcnt.

Referenced by lumiera_mmapings_release_mmap().

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