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Viewing changes to storage/innobase/read/read0read.c

  • Committer: Brian Aker
  • Date: 2008-09-04 19:31:00 UTC
  • Revision ID: brian@tangent.org-20080904193100-l849hgghfy4urj43
Changing default character set from this point on.

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Lines of Context:
storage/innobase/read/read0read.c
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the creating trx of the oldest view is set as not visible in the 'copied'
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view. Opens a new view if no views currently exist. The view must be closed
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with ..._close. This is used in purge. */
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UNIV_INTERN
 
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read_view_t*
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read_view_oldest_copy_or_open_new(
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/*==============================*/
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        n = old_view->n_trx_ids;
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        if (!ut_dulint_is_zero(old_view->creator_trx_id)) {
 
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        if (ut_dulint_cmp(old_view->creator_trx_id,
 
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                          ut_dulint_create(0,0)) != 0) {
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                n++;
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        } else {
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                needs_insert = FALSE;
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        view_copy->low_limit_no = old_view->low_limit_no;
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        view_copy->low_limit_id = old_view->low_limit_id;
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        view_copy->can_be_too_old = FALSE;
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        if (n > 0) {
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                /* The last active transaction has the smallest id: */
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/*************************************************************************
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Opens a read view where exactly the transactions serialized before this
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point in time are seen in the view. */
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UNIV_INTERN
 
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read_view_t*
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read_view_open_now(
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/*===============*/
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        view->creator_trx_id = cr_trx_id;
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        view->type = VIEW_NORMAL;
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        view->undo_no = ut_dulint_zero;
 
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        view->undo_no = ut_dulint_create(0, 0);
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        /* No future transactions should be visible in the view */
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        view->low_limit_no = trx_sys->max_trx_id;
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        view->low_limit_id = view->low_limit_no;
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        view->can_be_too_old = FALSE;
 
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        n = 0;
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        trx = UT_LIST_GET_FIRST(trx_sys->trx_list);
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/*************************************************************************
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Closes a read view. */
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UNIV_INTERN
 
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void
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read_view_close(
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/*============*/
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/*************************************************************************
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Closes a consistent read view for MySQL. This function is called at an SQL
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statement end if the trx isolation level is <= TRX_ISO_READ_COMMITTED. */
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UNIV_INTERN
 
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void
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read_view_close_for_mysql(
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/*======================*/
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/*************************************************************************
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Prints a read view to stderr. */
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UNIV_INTERN
 
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void
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read_view_print(
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/*============*/
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                (ulong) ut_dulint_get_high(view->low_limit_no),
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                (ulong) ut_dulint_get_low(view->low_limit_no));
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        fprintf(stderr, "Read view up limit trx id " TRX_ID_FMT "\n",
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                TRX_ID_PREP_PRINTF(view->up_limit_id));
 
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        fprintf(stderr, "Read view up limit trx id %lu %lu\n",
 
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                (ulong) ut_dulint_get_high(view->up_limit_id),
 
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                (ulong) ut_dulint_get_low(view->up_limit_id));
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        fprintf(stderr, "Read view low limit trx id " TRX_ID_FMT "\n",
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                TRX_ID_PREP_PRINTF(view->low_limit_id));
 
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        fprintf(stderr, "Read view low limit trx id %lu %lu\n",
 
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                (ulong) ut_dulint_get_high(view->low_limit_id),
 
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                (ulong) ut_dulint_get_low(view->low_limit_id));
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        fprintf(stderr, "Read view individually stored trx ids:\n");
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        n_ids = view->n_trx_ids;
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        for (i = 0; i < n_ids; i++) {
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                fprintf(stderr, "Read view trx id " TRX_ID_FMT "\n",
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                        TRX_ID_PREP_PRINTF(
 
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                fprintf(stderr, "Read view trx id %lu %lu\n",
 
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                        (ulong) ut_dulint_get_high(
 
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                                read_view_get_nth_trx_id(view, i)),
 
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                        (ulong) ut_dulint_get_low(
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                                read_view_get_nth_trx_id(view, i)));
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        }
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}
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in cursors. In this consistent read view modifications done by the
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creating transaction after the cursor is created or future transactions
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are not visible. */
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UNIV_INTERN
 
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cursor_view_t*
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read_cursor_view_create_for_mysql(
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/*==============================*/
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        view->low_limit_no = trx_sys->max_trx_id;
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        view->low_limit_id = view->low_limit_no;
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        view->can_be_too_old = FALSE;
 
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        n = 0;
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        trx = UT_LIST_GET_FIRST(trx_sys->trx_list);
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/*************************************************************************
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Close a given consistent cursor view for mysql and restore global read view
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back to a transaction read view. */
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UNIV_INTERN
 
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void
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read_cursor_view_close_for_mysql(
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/*=============================*/
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This function sets a given consistent cursor view to a transaction
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read view if given consistent cursor view is not NULL. Otherwise, function
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restores a global read view to a transaction read view. */
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UNIV_INTERN
 
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void
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read_cursor_set_for_mysql(
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/*======================*/