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);
}
ulint
trx_commit_for_mysql(
/*=================*/
/* out: 0 or error number */
trx_t* trx) /* in: trx handle */
{
/* Because we do not do the commit by sending an Innobase
sig to the transaction, we must here make sure that trx has been
started. */
ut_a(trx);
trx->op_info = "committing";
/* If we are doing the XA recovery of prepared transactions, then
the transaction object does not have an InnoDB session object, and we
set the dummy session that we use for all MySQL transactions. */
if (trx->sess == NULL) {
/* Open a dummy session */
if (!trx_dummy_sess) {
mutex_enter(&kernel_mutex);
if (!trx_dummy_sess) {
trx_dummy_sess = sess_open();
}
mutex_exit(&kernel_mutex);
}
trx->sess = trx_dummy_sess;
}
trx_start_if_not_started(trx);
mutex_enter(&kernel_mutex);
trx_commit_off_kernel(trx);
mutex_exit(&kernel_mutex);
trx->op_info = "";
return(0);
}
/********************************************************************//**
Creates the global purge system control structure and inits the history
mutex. */
UNIV_INTERN
void
trx_purge_sys_create(
/*=================*/
ib_bh_t* ib_bh) /*!< in, own: UNDO log min binary heap */
{
ut_ad(mutex_own(&kernel_mutex));
purge_sys = mem_zalloc(sizeof(trx_purge_t));
/* Take ownership of ib_bh, we are responsible for freeing it. */
purge_sys->ib_bh = ib_bh;
purge_sys->state = TRX_STOP_PURGE;
purge_sys->n_pages_handled = 0;
purge_sys->purge_trx_no = 0;
purge_sys->purge_undo_no = 0;
purge_sys->next_stored = FALSE;
ut_d(purge_sys->done_trx_no = 0);
rw_lock_create(trx_purge_latch_key,
&purge_sys->latch, SYNC_PURGE_LATCH);
mutex_create(
purge_sys_bh_mutex_key, &purge_sys->bh_mutex,
SYNC_PURGE_QUEUE);
purge_sys->heap = mem_heap_create(256);
purge_sys->arr = trx_undo_arr_create();
purge_sys->sess = sess_open();
purge_sys->trx = purge_sys->sess->trx;
purge_sys->trx->is_purge = 1;
ut_a(trx_start_low(purge_sys->trx, ULINT_UNDEFINED));
purge_sys->query = trx_purge_graph_build();
purge_sys->prebuilt_view =
read_view_oldest_copy_or_open_new(0, NULL);
purge_sys->view = purge_sys->prebuilt_view;
}
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 the global purge system control structure and inits the history
mutex. */
UNIV_INTERN
void
trx_purge_sys_create(void)
/*======================*/
{
ut_ad(mutex_own(&kernel_mutex));
purge_sys = mem_alloc(sizeof(trx_purge_t));
purge_sys->state = TRX_STOP_PURGE;
purge_sys->n_pages_handled = 0;
purge_sys->purge_trx_no = ut_dulint_zero;
purge_sys->purge_undo_no = ut_dulint_zero;
purge_sys->next_stored = FALSE;
ut_d(purge_sys->done_trx_no = ut_dulint_zero);
rw_lock_create(&purge_sys->latch, SYNC_PURGE_LATCH);
mutex_create(&purge_sys->mutex, SYNC_PURGE_SYS);
purge_sys->heap = mem_heap_create(256);
purge_sys->arr = trx_undo_arr_create();
purge_sys->sess = sess_open();
purge_sys->trx = purge_sys->sess->trx;
purge_sys->trx->is_purge = 1;
ut_a(trx_start_low(purge_sys->trx, ULINT_UNDEFINED));
purge_sys->query = trx_purge_graph_build();
purge_sys->view = read_view_oldest_copy_or_open_new(ut_dulint_zero,
purge_sys->heap);
}
