Per_thread_connection_handler Class Reference

This class represents the connection handling functionality that each connection is being handled in a single thread. More...

#include <connection_handler_impl.h>

Inheritance diagram for Per_thread_connection_handler:

Public Member Functions
	Per_thread_connection_handler ()=default
	~Per_thread_connection_handler () override=default

Static Public Member Functions
static void	init ()
static void	destroy ()
static void	kill_blocked_pthreads ()
	Wake blocked pthreads and wait until they have terminated. More...
static Channel_info *	block_until_new_connection ()
	Block until a new connection arrives. More...
static void	modify_thread_cache_size (const ulong thread_cache_size)
	Modify the thread cache size. More...
static ulong	get_blocked_pthread_count ()
	Return blocked threads count. More...

Static Public Attributes
static ulong	blocked_pthread_count = 0
static ulong	slow_launch_threads = 0
static bool	shrink_cache = false
static ulong	max_blocked_pthreads = 0

Protected Member Functions
bool	add_connection (Channel_info *channel_info) override
	Add a connection. More...
uint	get_max_threads () const override
Protected Member Functions inherited from Connection_handler
	Connection_handler ()=default
virtual	~Connection_handler ()=default

Private Member Functions
	Per_thread_connection_handler (const Per_thread_connection_handler &)
Per_thread_connection_handler &	operator= (const Per_thread_connection_handler &)
bool	check_idle_thread_and_enqueue_connection (Channel_info *channel_info)
	Check if idle threads to handle connection in thread cache. More...

Static Private Attributes
static std::list< Channel_info * > *	waiting_channel_info_list = nullptr
	List of pending channel info objects to be picked by idle threads. More...
static mysql_mutex_t	LOCK_thread_cache
static mysql_cond_t	COND_thread_cache
static mysql_cond_t	COND_flush_thread_cache

Detailed Description

This class represents the connection handling functionality that each connection is being handled in a single thread.

Constructor & Destructor Documentation

Per_thread_connection_handler() [1/2]

Per_thread_connection_handler::Per_thread_connection_handler ( const Per_thread_connection_handler &  )

private

Per_thread_connection_handler() [2/2]

Per_thread_connection_handler::Per_thread_connection_handler ( )

default

~Per_thread_connection_handler()

Per_thread_connection_handler::~Per_thread_connection_handler ( )

overridedefault

Member Function Documentation

add_connection()

bool Per_thread_connection_handler::add_connection ( Channel_info *  channel_info )

overrideprotectedvirtual

Add a connection.

Parameters

channel_info

Pointer to the Channel_info object.

Note

If this function is successful (returns false), the ownership of channel_info is transferred. Otherwise the caller is responsible for its destruction.

Returns

true if processing of the new connection failed, false otherwise.

Implements Connection_handler.

block_until_new_connection()

Channel_info * Per_thread_connection_handler::block_until_new_connection ( )

static

Block until a new connection arrives.

Block the current pthread for reuse by new connections.

Return values

NULL	Too many pthreads blocked already or shutdown in progress.
!NULL	Pointer to Channel_info object representing the new connection to be served by this pthread.

check_idle_thread_and_enqueue_connection()

bool Per_thread_connection_handler::check_idle_thread_and_enqueue_connection ( Channel_info *  channel_info )

private

Check if idle threads to handle connection in thread cache.

If so enqueue the new connection to be picked by the idle thread in thread cache.

Return values

false

if idle pthread was found, else true.

destroy()

void Per_thread_connection_handler::destroy ( )

static

get_blocked_pthread_count()

ulong Per_thread_connection_handler::get_blocked_pthread_count ( )

static

Return blocked threads count.

get_max_threads()

uint Per_thread_connection_handler::get_max_threads ( ) const

overrideprotectedvirtual

Returns

Maximum number of threads that can be created by this connection handler.

Implements Connection_handler.

init()

void Per_thread_connection_handler::init ( )

static

kill_blocked_pthreads()

void Per_thread_connection_handler::kill_blocked_pthreads ( )

static

Wake blocked pthreads and wait until they have terminated.

modify_thread_cache_size()

void Per_thread_connection_handler::modify_thread_cache_size ( const ulong  thread_cache_size )

static

Modify the thread cache size.

Parameters

thread_cache_size

size of thread cache.

operator=()

Per_thread_connection_handler & Per_thread_connection_handler::operator= ( const Per_thread_connection_handler &  )

private

Member Data Documentation

blocked_pthread_count

ulong Per_thread_connection_handler::blocked_pthread_count = 0

static

COND_flush_thread_cache

mysql_cond_t Per_thread_connection_handler::COND_flush_thread_cache

staticprivate

COND_thread_cache

mysql_cond_t Per_thread_connection_handler::COND_thread_cache

staticprivate

LOCK_thread_cache

mysql_mutex_t Per_thread_connection_handler::LOCK_thread_cache

staticprivate

max_blocked_pthreads

ulong Per_thread_connection_handler::max_blocked_pthreads = 0

static

shrink_cache

bool Per_thread_connection_handler::shrink_cache = false

static

slow_launch_threads

ulong Per_thread_connection_handler::slow_launch_threads = 0

static

waiting_channel_info_list

std::list< Channel_info * > * Per_thread_connection_handler::waiting_channel_info_list = nullptr

staticprivate

List of pending channel info objects to be picked by idle threads.

Protected by LOCK_thread_cache.

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The documentation for this class was generated from the following files:

• sql/conn_handler/connection_handler_impl.h
• sql/conn_handler/connection_handler_per_thread.cc