os0thread-create.h File Reference

The interface to the threading wrapper. More...

#include <my_thread.h>
#include "univ.i"
#include "os0thread.h"
#include "sql_thd_internal_api.h"
#include <atomic>
#include <functional>

Go to the source code of this file.

Classes
class	MySQL_thread
	Register with MySQL infrastructure. More...
class	Runnable
	Execute in the context of a non detached MySQL thread. More...
class	Detached_thread
	Wrapper for a callable, it will count the number of registered Runnable instances and will register the thread executing the callable with the PFS and the Server threading infrastructure. More...

Macros
#define	os_thread_create(...)   create_detached_thread(__VA_ARGS__)
#define	par_for(...)   par_for(__VA_ARGS__)

Functions
void	os_thread_open ()
	Initializes OS thread management data structures. More...
bool	os_thread_any_active ()
	Check if there are threads active. More...
void	os_thread_close ()
	Frees OS thread management data structures. More...
bool	thread_is_stopped (const IB_thread &thread)
	Check if thread is stopped. More...
bool	thread_is_active (const IB_thread &thread)
	Check if thread is active. More...
template<typename F , typename... Args>
IB_thread	create_detached_thread (mysql_pfs_key_t pfs_key, PSI_thread_seqnum pfs_seqnum, F &&f, Args &&...args)
	Create a detached non-started thread. More...
template<typename Container , typename F , typename... Args>
void	par_for (mysql_pfs_key_t pfs_key, const Container &c, size_t n, F &&f, Args &&...args)
	Parallel for loop over a container. More...

Variables
uint32_t	srv_max_n_threads
	Maximum number of threads inside InnoDB. More...
std::atomic_int	os_thread_count
	Number of threads active. More...

Detailed Description

The interface to the threading wrapper.

Created 2016-May-17 Sunny Bains

Macro Definition Documentation

os_thread_create

#define os_thread_create

(

...

)

create_detached_thread(__VA_ARGS__)

par_for

#define par_for

(

...

)

par_for(__VA_ARGS__)

Function Documentation

create_detached_thread()

template<typename F , typename... Args>

IB_thread create_detached_thread	(	mysql_pfs_key_t	pfs_key,
		PSI_thread_seqnum	pfs_seqnum,
		F &&	f,
		Args &&...	args
	)

Create a detached non-started thread.

After thread is created, you should assign the received object to any of variables/fields which you later could access to check thread's state. You are allowed to either move or copy that object (any number of copies is allowed). After assigning you are allowed to start the thread by calling start() on any of those objects.

Parameters

[in]	pfs_key	Performance schema thread key
[in]	pfs_seqnum	Performance schema thread sequence number
[in]	f	Callable instance
[in]	args	Zero or more args

Returns

Object which allows to start the created thread, monitor its state and wait until the thread is finished.

os_thread_any_active()

bool os_thread_any_active ( )

inline

Check if there are threads active.

Returns

true if the thread count > 0.

os_thread_close()

void os_thread_close ( )

inline

Frees OS thread management data structures.

os_thread_open()

void os_thread_open ( )

inline

Initializes OS thread management data structures.

par_for()

template<typename Container , typename F , typename... Args>

void par_for	(	mysql_pfs_key_t	pfs_key,
		const Container &	c,
		size_t	n,
		F &&	f,
		Args &&...	args
	)

Parallel for loop over a container.

Parameters

[in]	pfs_key	Performance schema thread key
[in]	c	Container to iterate over in parallel
[in]	n	Number of threads to create
[in]	f	Callable instance
[in]	args	Zero or more args

thread_is_active()

bool thread_is_active ( const IB_thread &  thread )

inline

Check if thread is active.

Parameters

[in]

thread

Thread handle.

Returns

true if the thread is active.

thread_is_stopped()

bool thread_is_stopped ( const IB_thread &  thread )

inline

Check if thread is stopped.

Parameters

[in]

thread

Thread handle.

Returns

true if the thread has started, finished tasks and stopped.

Variable Documentation

os_thread_count

std::atomic_int os_thread_count

extern

Number of threads active.

srv_max_n_threads

uint32_t srv_max_n_threads

extern

Maximum number of threads inside InnoDB.

Maximum number of threads inside InnoDB.

innodb_init_params() sets the value.