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/******************************************************
Mini-transaction buffer
(c) 1995 Innobase Oy
Created 11/26/1995 Heikki Tuuri
*******************************************************/
#include "sync0sync.h"
#include "sync0rw.h"
#include "mach0data.h"
/*******************************************************************
Starts a mini-transaction and creates a mini-transaction handle
and a buffer in the memory buffer given by the caller. */
UNIV_INLINE
mtr_t*
mtr_start(
/*======*/
/* out: mtr buffer which also acts as
the mtr handle */
mtr_t* mtr) /* in: memory buffer for the mtr buffer */
{
dyn_array_create(&(mtr->memo));
dyn_array_create(&(mtr->log));
mtr->log_mode = MTR_LOG_ALL;
mtr->modifications = FALSE;
mtr->n_log_recs = 0;
#ifdef UNIV_DEBUG
mtr->state = MTR_ACTIVE;
mtr->magic_n = MTR_MAGIC_N;
#endif
return(mtr);
}
/*******************************************************
Pushes an object to an mtr memo stack. */
UNIV_INLINE
void
mtr_memo_push(
/*==========*/
mtr_t* mtr, /* in: mtr */
void* object, /* in: object */
ulint type) /* in: object type: MTR_MEMO_S_LOCK, ... */
{
dyn_array_t* memo;
mtr_memo_slot_t* slot;
ut_ad(object);
ut_ad(type >= MTR_MEMO_PAGE_S_FIX);
ut_ad(type <= MTR_MEMO_X_LOCK);
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
memo = &(mtr->memo);
slot = dyn_array_push(memo, sizeof(mtr_memo_slot_t));
slot->object = object;
slot->type = type;
}
/**************************************************************
Sets and returns a savepoint in mtr. */
UNIV_INLINE
ulint
mtr_set_savepoint(
/*==============*/
/* out: savepoint */
mtr_t* mtr) /* in: mtr */
{
dyn_array_t* memo;
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
memo = &(mtr->memo);
return(dyn_array_get_data_size(memo));
}
/**************************************************************
Releases the (index tree) s-latch stored in an mtr memo after a
savepoint. */
UNIV_INLINE
void
mtr_release_s_latch_at_savepoint(
/*=============================*/
mtr_t* mtr, /* in: mtr */
ulint savepoint, /* in: savepoint */
rw_lock_t* lock) /* in: latch to release */
{
mtr_memo_slot_t* slot;
dyn_array_t* memo;
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
ut_ad(mtr->state == MTR_ACTIVE);
memo = &(mtr->memo);
ut_ad(dyn_array_get_data_size(memo) > savepoint);
slot = dyn_array_get_element(memo, savepoint);
ut_ad(slot->object == lock);
ut_ad(slot->type == MTR_MEMO_S_LOCK);
rw_lock_s_unlock(lock);
slot->object = NULL;
}
/**************************************************************
Checks if memo contains the given item. */
UNIV_INLINE
ibool
mtr_memo_contains(
/*==============*/
/* out: TRUE if contains */
mtr_t* mtr, /* in: mtr */
void* object, /* in: object to search */
ulint type) /* in: type of object */
{
mtr_memo_slot_t* slot;
dyn_array_t* memo;
ulint offset;
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
memo = &(mtr->memo);
offset = dyn_array_get_data_size(memo);
while (offset > 0) {
offset -= sizeof(mtr_memo_slot_t);
slot = dyn_array_get_element(memo, offset);
if ((object == slot->object) && (type == slot->type)) {
return(TRUE);
}
}
return(FALSE);
}
/*******************************************************************
Returns the log object of a mini-transaction buffer. */
UNIV_INLINE
dyn_array_t*
mtr_get_log(
/*========*/
/* out: log */
mtr_t* mtr) /* in: mini-transaction */
{
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
return(&(mtr->log));
}
/*******************************************************************
Gets the logging mode of a mini-transaction. */
UNIV_INLINE
ulint
mtr_get_log_mode(
/*=============*/
/* out: logging mode: MTR_LOG_NONE, ... */
mtr_t* mtr) /* in: mtr */
{
ut_ad(mtr);
ut_ad(mtr->log_mode >= MTR_LOG_ALL);
ut_ad(mtr->log_mode <= MTR_LOG_SHORT_INSERTS);
return(mtr->log_mode);
}
/*******************************************************************
Changes the logging mode of a mini-transaction. */
UNIV_INLINE
ulint
mtr_set_log_mode(
/*=============*/
/* out: old mode */
mtr_t* mtr, /* in: mtr */
ulint mode) /* in: logging mode: MTR_LOG_NONE, ... */
{
ulint old_mode;
ut_ad(mtr);
ut_ad(mode >= MTR_LOG_ALL);
ut_ad(mode <= MTR_LOG_SHORT_INSERTS);
old_mode = mtr->log_mode;
if ((mode == MTR_LOG_SHORT_INSERTS) && (old_mode == MTR_LOG_NONE)) {
/* Do nothing */
} else {
mtr->log_mode = mode;
}
ut_ad(old_mode >= MTR_LOG_ALL);
ut_ad(old_mode <= MTR_LOG_SHORT_INSERTS);
return(old_mode);
}
/*************************************************************************
Locks a lock in s-mode. */
UNIV_INLINE
void
mtr_s_lock_func(
/*============*/
rw_lock_t* lock, /* in: rw-lock */
const char* file, /* in: file name */
ulint line, /* in: line number */
mtr_t* mtr) /* in: mtr */
{
ut_ad(mtr);
ut_ad(lock);
rw_lock_s_lock_func(lock, 0, file, line);
mtr_memo_push(mtr, lock, MTR_MEMO_S_LOCK);
}
/*************************************************************************
Locks a lock in x-mode. */
UNIV_INLINE
void
mtr_x_lock_func(
/*============*/
rw_lock_t* lock, /* in: rw-lock */
const char* file, /* in: file name */
ulint line, /* in: line number */
mtr_t* mtr) /* in: mtr */
{
ut_ad(mtr);
ut_ad(lock);
rw_lock_x_lock_func(lock, 0, file, line);
mtr_memo_push(mtr, lock, MTR_MEMO_X_LOCK);
}
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