hash0hash.cc File Reference

The simple hash table utility. More...

#include "hash0hash.h"
#include "mem0mem.h"
#include "sync0sync.h"
#include "ut0math.h"

Functions
bool	hash_lock_has_all_x (const hash_table_t *table)
	Verifies that the current thread holds X-latch on all shards. More...
void	hash_lock_x_all (hash_table_t *table)
	Reserves all the locks of a hash table, in an ascending order. More...
void	hash_unlock_x_all (hash_table_t *table)
	Releases all the locks of a hash table, in an ascending order. More...
void	hash_unlock_x_all_but (hash_table_t *table, rw_lock_t *keep_lock)
	Releases all but passed in lock of a hash table,. More...
void	hash_create_sync_obj (hash_table_t *table, latch_id_t id, size_t n_sync_obj)
	Creates a sync object array to protect a hash table. More...

Detailed Description

The simple hash table utility.

Created 5/20/1997 Heikki Tuuri

Function Documentation

hash_create_sync_obj()

void hash_create_sync_obj	(	hash_table_t *	table,
		latch_id_t	id,
		size_t	n_sync_obj
	)

Creates a sync object array to protect a hash table.

Parameters

[in]	table	hash table
[in]	id	latch ID
[in]	n_sync_obj	number of sync objects, must be a power of 2

hash_lock_has_all_x()

bool hash_lock_has_all_x

(

const hash_table_t *

table

)

Verifies that the current thread holds X-latch on all shards.

Assumes type==HASH_TABLE_SYNC_RW_LOCK.

Parameters

[in]

table

the table in question

Returns

true iff the current thread holds X-latch on all shards

hash_lock_x_all()

void hash_lock_x_all

(

hash_table_t *

table

)

Reserves all the locks of a hash table, in an ascending order.

in: hash table

Parameters

table

in: hash table

hash_unlock_x_all()

void hash_unlock_x_all

(

hash_table_t *

table

)

Releases all the locks of a hash table, in an ascending order.

in: hash table

Parameters

table

in: hash table

hash_unlock_x_all_but()

void hash_unlock_x_all_but	(	hash_table_t *	table,
		rw_lock_t *	keep_lock
	)

Releases all but passed in lock of a hash table,.

Parameters

[in]	table	Hash table
[in]	keep_lock	Lock to keep

Parameters

table	in: hash table
keep_lock	in: lock to keep