A RAII wrapper class which s-latches the global lock_sys shard, and mutexes protecting specified shards for the duration of its scope. More...

#include <lock0guards.h>

Public Member Functions
	Shard_latches_guard (ut::Location location, const buf_block_t &block_a, const buf_block_t &block_b)

Private Attributes
Global_shared_latch_guard	m_global_shared_latch_guard

Shard_naked_latches_guard	m_shard_naked_latches_guard

Detailed Description

A RAII wrapper class which s-latches the global lock_sys shard, and mutexes protecting specified shards for the duration of its scope.

It makes sure to take the latches in correct order and handles the case where both pages are in the same shard correctly. The order of initialization is important: we have to take shared global latch BEFORE we attempt to use hash function to compute correct shard and latch it.

Constructor & Destructor Documentation

◆ Shard_latches_guard()

locksys::Shard_latches_guard::Shard_latches_guard	(	ut::Location	location,
		const buf_block_t &	block_a,
		const buf_block_t &	block_b
	)

inlineexplicit

Member Data Documentation

◆ m_global_shared_latch_guard

Global_shared_latch_guard locksys::Shard_latches_guard::m_global_shared_latch_guard

private

◆ m_shard_naked_latches_guard

Shard_naked_latches_guard locksys::Shard_latches_guard::m_shard_naked_latches_guard