smthread.h File Reference

#include "w_defines.h"
#include <cassert>
#include "w.h"
#include "sm_base.h"
#include "w_bitvector.h"
#include <mutex>
#include <memory>
#include <list>
#include "timeout.h"
#include "latches.h"
#include "logrec.h"
#include "smstats.h"

Go to the source code of this file.

Classes
class	smthread_t
	Storage Manager thread. More...
struct	smthread_t::tcb_t
class	smthread_t::GlobalThreadList

Macros
#define	GET_TSTAT(x)   smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)]
	Get per-thread statistic named x. More...
#define	INC_TSTAT(x)   smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)]++
	Increment per-thread statistic named x by y. More...
#define	ADD_TSTAT(x, y)   smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)] += (y)
	Increment statistic named x by y. More...
#define	SET_TSTAT(x, y)   smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)] = (y)
	Set per-thread statistic named x to y. More...

Typedefs
typedef sm_thread_map_t	atomic_thread_map_t
	Fingerprint for this smthread. More...

Functions
xct_t *	xct ()

Macro Definition Documentation

ADD_TSTAT

#define ADD_TSTAT	(		x,
			y
	)		smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)] += (y)

Increment statistic named x by y.

GET_TSTAT

#define GET_TSTAT

(

x

)

smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)]

Get per-thread statistic named x.

INC_TSTAT

#define INC_TSTAT

(

x

)

smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)]++

Increment per-thread statistic named x by y.

SET_TSTAT

#define SET_TSTAT	(		x,
			y
	)		smthread_t::TL_stats()[enum_to_base(sm_stat_id::x)] = (y)

Set per-thread statistic named x to y.

Typedef Documentation

atomic_thread_map_t

typedef sm_thread_map_t atomic_thread_map_t

Fingerprint for this smthread.

skip

Each smthread_t has a fingerprint. This is used by the deadlock detector. The fingerprint is a bitmap; each thread's bitmap is unique, the deadlock detector ORs fingerprints together to make a "digest" of the waits-for-map. Rather than have fingerprints associated with transactions, we associate them with threads.

This class provides synchronization (protection) for updating the map.

Note

: If you want to be sure the fingerprints are unique, for the purpose of eliminating false-positives in the lock manager's deadlock detector while debugging something, look at the code in smthread_t::_initialize_fingerprint(), where you can enable some debugging code. (There is no need to make them unique – if there were, we'd use 1 bit per... – but if you are debugging something you might want to ensure or detect uniqueness for that purpose.)

Function Documentation

xct()

xct_t* xct ( )

inline