trx_t*
trx_allocate_for_mysql(void)
/*========================*/
/* out, own: transaction object */
{
trx_t* trx;
mutex_enter(&kernel_mutex);
/* Open a dummy session */
if (!trx_dummy_sess) {
trx_dummy_sess = sess_open();
}
trx = trx_create(trx_dummy_sess);
trx_n_mysql_transactions++;
UT_LIST_ADD_FIRST(mysql_trx_list, trx_sys->mysql_trx_list, trx);
mutex_exit(&kernel_mutex);
trx->mysql_thread_id = os_thread_get_curr_id();
trx->mysql_process_no = os_proc_get_number();
return(trx);
}
/********************************************************************//**
Creates a transaction object for background operations by the master thread.
@return own: transaction object */
UNIV_INTERN
trx_t*
trx_allocate_for_background(void)
/*=============================*/
{
trx_t* trx;
mutex_enter(&kernel_mutex);
trx = trx_create(trx_dummy_sess);
mutex_exit(&kernel_mutex);
return(trx);
}
sess_t*
sess_open(void)
/*===========*/
/* out, own: session object */
{
sess_t* sess;
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(&kernel_mutex));
#endif /* UNIV_SYNC_DEBUG */
sess = mem_alloc(sizeof(sess_t));
sess->state = SESS_ACTIVE;
sess->trx = trx_create(sess);
UT_LIST_INIT(sess->graphs);
return(sess);
}
trx_t*
trx_allocate_for_background(void)
/*=============================*/
/* out, own: transaction object */
{
trx_t* trx;
mutex_enter(&kernel_mutex);
/* Open a dummy session */
if (!trx_dummy_sess) {
trx_dummy_sess = sess_open();
}
trx = trx_create(trx_dummy_sess);
mutex_exit(&kernel_mutex);
return(trx);
}
/********************************************************************//**
Creates a transaction object for MySQL.
@return own: transaction object */
UNIV_INTERN
trx_t*
trx_allocate_for_mysql(void)
/*========================*/
{
trx_t* trx;
mutex_enter(&kernel_mutex);
trx = trx_create(trx_dummy_sess);
trx_n_mysql_transactions++;
UT_LIST_ADD_FIRST(mysql_trx_list, trx_sys->mysql_trx_list, trx);
mutex_exit(&kernel_mutex);
trx->mysql_thread_id = os_thread_get_curr_id();
trx->mysql_process_no = os_proc_get_number();
return(trx);
}
/****************************************************************//**
Creates trx objects for transactions and initializes the trx list of
trx_sys at database start. Rollback segment and undo log lists must
already exist when this function is called, because the lists of
transactions to be rolled back or cleaned up are built based on the
undo log lists. */
UNIV_INTERN
void
trx_lists_init_at_db_start(void)
/*============================*/
{
trx_rseg_t* rseg;
trx_undo_t* undo;
trx_t* trx;
ut_ad(mutex_own(&kernel_mutex));
UT_LIST_INIT(trx_sys->trx_list);
/* Look from the rollback segments if there exist undo logs for
transactions */
rseg = UT_LIST_GET_FIRST(trx_sys->rseg_list);
while (rseg != NULL) {
undo = UT_LIST_GET_FIRST(rseg->insert_undo_list);
while (undo != NULL) {
trx = trx_create(trx_dummy_sess);
trx->is_recovered = TRUE;
trx->id = undo->trx_id;
trx->xid = undo->xid;
trx->insert_undo = undo;
trx->rseg = rseg;
if (undo->state != TRX_UNDO_ACTIVE) {
/* Prepared transactions are left in
the prepared state waiting for a
commit or abort decision from MySQL */
if (undo->state == TRX_UNDO_PREPARED) {
fprintf(stderr,
"InnoDB: Transaction "
TRX_ID_FMT
" was in the"
" XA prepared state.\n",
TRX_ID_PREP_PRINTF(trx->id));
if (srv_force_recovery == 0) {
trx->conc_state = TRX_PREPARED;
} else {
fprintf(stderr,
"InnoDB: Since"
" innodb_force_recovery"
" > 0, we will"
" rollback it"
" anyway.\n");
trx->conc_state = TRX_ACTIVE;
}
} else {
trx->conc_state
= TRX_COMMITTED_IN_MEMORY;
}
/* We give a dummy value for the trx no;
this should have no relevance since purge
is not interested in committed transaction
numbers, unless they are in the history
list, in which case it looks the number
from the disk based undo log structure */
trx->no = trx->id;
} else {
trx->conc_state = TRX_ACTIVE;
/* A running transaction always has the number
field inited to ut_dulint_max */
trx->no = ut_dulint_max;
}
if (undo->dict_operation) {
trx_set_dict_operation(
trx, TRX_DICT_OP_TABLE);
trx->table_id = undo->table_id;
}
if (!undo->empty) {
trx->undo_no = ut_dulint_add(undo->top_undo_no,
1);
}
trx_list_insert_ordered(trx);
undo = UT_LIST_GET_NEXT(undo_list, undo);
}
undo = UT_LIST_GET_FIRST(rseg->update_undo_list);
while (undo != NULL) {
trx = trx_get_on_id(undo->trx_id);
if (NULL == trx) {
trx = trx_create(trx_dummy_sess);
trx->is_recovered = TRUE;
trx->id = undo->trx_id;
trx->xid = undo->xid;
if (undo->state != TRX_UNDO_ACTIVE) {
/* Prepared transactions are left in
the prepared state waiting for a
commit or abort decision from MySQL */
if (undo->state == TRX_UNDO_PREPARED) {
fprintf(stderr,
"InnoDB: Transaction "
TRX_ID_FMT " was in the"
" XA prepared state.\n",
TRX_ID_PREP_PRINTF(
trx->id));
if (srv_force_recovery == 0) {
trx->conc_state
= TRX_PREPARED;
} else {
fprintf(stderr,
"InnoDB: Since"
" innodb_force_recovery"
" > 0, we will"
" rollback it"
" anyway.\n");
trx->conc_state
= TRX_ACTIVE;
}
} else {
trx->conc_state
= TRX_COMMITTED_IN_MEMORY;
}
/* We give a dummy value for the trx
number */
trx->no = trx->id;
} else {
trx->conc_state = TRX_ACTIVE;
/* A running transaction always has
the number field inited to
ut_dulint_max */
trx->no = ut_dulint_max;
}
trx->rseg = rseg;
trx_list_insert_ordered(trx);
if (undo->dict_operation) {
trx_set_dict_operation(
trx, TRX_DICT_OP_TABLE);
trx->table_id = undo->table_id;
}
}
trx->update_undo = undo;
if ((!undo->empty)
&& (ut_dulint_cmp(undo->top_undo_no,
trx->undo_no) >= 0)) {
trx->undo_no = ut_dulint_add(undo->top_undo_no,
1);
}
undo = UT_LIST_GET_NEXT(undo_list, undo);
}
rseg = UT_LIST_GET_NEXT(rseg_list, rseg);
}
}