sp_cache.cc File Reference

#include "sql/sp_cache.h"
#include <stddef.h>
#include <atomic>
#include <memory>
#include <string>
#include "lex_string.h"
#include "map_helpers.h"
#include "my_dbug.h"
#include "mysql/strings/m_ctype.h"
#include "sql/psi_memory_key.h"
#include "sql/sp_head.h"

Classes
class	sp_cache
struct	sp_cache::sp_head_deleter

Functions
void	sp_cache_clear (sp_cache **cp)
void	sp_cache_insert (sp_cache **cp, sp_head *sp)
sp_head *	sp_cache_lookup (sp_cache **cp, const sp_name *name)
void	sp_cache_invalidate ()
void	sp_cache_flush_obsolete (sp_cache **cp, sp_head **sp)
	Remove an out-of-date SP from the cache. More...
int64	sp_cache_version ()
	Return the current global version of the cache. More...
void	sp_cache_enforce_limit (sp_cache *c, ulong upper_limit_for_elements)
	Enforce that the current number of elements in the cache don't exceed the argument value by flushing the cache if necessary. More...
bool	sp_cache_has (sp_cache *cp, sp_head *sp)
	Check if the sp_cache contains the specified stored program. More...

Variables
static std::atomic< int64 >	atomic_Cversion {0}

Function Documentation

sp_cache_clear()

void sp_cache_clear

(

sp_cache **

cp

)

sp_cache_enforce_limit()

void sp_cache_enforce_limit	(	sp_cache *	c,
		ulong	upper_limit_for_elements
	)

Enforce that the current number of elements in the cache don't exceed the argument value by flushing the cache if necessary.

Parameters

[in]	c	Cache to check
[in]	upper_limit_for_elements	Soft upper limit for number of sp_head objects that can be stored in the cache.

sp_cache_flush_obsolete()

void sp_cache_flush_obsolete	(	sp_cache **	cp,
		sp_head **	sp
	)

Remove an out-of-date SP from the cache.

Parameters

[in]	cp	Cache to flush
[in]	sp	SP to remove.

Note

This invalidates pointers to sp_head objects this thread uses. In practice that means 'dont call this function when inside SP'.

sp_cache_has()

bool sp_cache_has	(	sp_cache *	cp,
		sp_head *	sp
	)

Check if the sp_cache contains the specified stored program.

Note

If the sp is part of a recursion, check if the first instance is part of the sp_cache

Parameters

[in]	cp	- the sp_cache that is to be checked.
[in]	sp	- the stored program that needs to be part of that cache.

Returns

true if the element is in the cache.

false if not.

sp_cache_insert()

void sp_cache_insert	(	sp_cache **	cp,
		sp_head *	sp
	)

sp_cache_invalidate()

void sp_cache_invalidate

(

)

sp_cache_lookup()

sp_head * sp_cache_lookup	(	sp_cache **	cp,
		const sp_name *	name
	)

sp_cache_version()

int64 sp_cache_version

(

)

Return the current global version of the cache.

Variable Documentation

atomic_Cversion

std::atomic<int64> atomic_Cversion {0}

static