mariadb/innobase/include/trx0rseg.ic
unknown 2662b59306 Added Innobase to source distribution
Docs/manual.texi:
  Added Innobase documentation
configure.in:
  Incremented version
include/my_base.h:
  Added option for Innobase
myisam/mi_check.c:
  cleanup
mysql-test/t/bdb.test:
  cleanup
mysql-test/t/innobase.test:
  Extended with new tests from bdb.test
mysql-test/t/merge.test:
  Added test of SHOW create
mysys/my_init.c:
  Fix for UNIXWARE 7
scripts/mysql_install_db.sh:
  Always write how to start mysqld
scripts/safe_mysqld.sh:
  Fixed type
sql/ha_innobase.cc:
  Update to new version
sql/ha_innobase.h:
  Update to new version
sql/handler.h:
  Added 'update_table_comment()' and 'append_create_info()'
sql/sql_delete.cc:
  Fixes for Innobase
sql/sql_select.cc:
  Fixes for Innobase
sql/sql_show.cc:
  Append create information (for MERGE tables)
sql/sql_update.cc:
  Fixes for Innobase
2001-02-17 14:19:19 +02:00

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2.7 KiB
Text

/******************************************************
Rollback segment
(c) 1996 Innobase Oy
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#include "srv0srv.h"
/**********************************************************************
Gets a rollback segment header. */
UNIV_INLINE
trx_rsegf_t*
trx_rsegf_get(
/*==========*/
/* out: rollback segment header, page
x-latched */
ulint space, /* in: space where placed */
ulint page_no, /* in: page number of the header */
mtr_t* mtr) /* in: mtr */
{
trx_rsegf_t* header;
header = TRX_RSEG + buf_page_get(space, page_no, RW_X_LATCH, mtr);
buf_page_dbg_add_level(header, SYNC_RSEG_HEADER);
return(header);
}
/**********************************************************************
Gets a newly created rollback segment header. */
UNIV_INLINE
trx_rsegf_t*
trx_rsegf_get_new(
/*==============*/
/* out: rollback segment header, page
x-latched */
ulint space, /* in: space where placed */
ulint page_no, /* in: page number of the header */
mtr_t* mtr) /* in: mtr */
{
trx_rsegf_t* header;
header = TRX_RSEG + buf_page_get(space, page_no, RW_X_LATCH, mtr);
buf_page_dbg_add_level(header, SYNC_RSEG_HEADER_NEW);
return(header);
}
/*******************************************************************
Gets the file page number of the nth undo log slot. */
UNIV_INLINE
ulint
trx_rsegf_get_nth_undo(
/*===================*/
/* out: page number of the undo log segment */
trx_rsegf_t* rsegf, /* in: rollback segment header */
ulint n, /* in: index of slot */
mtr_t* mtr) /* in: mtr */
{
ut_ad(n < TRX_RSEG_N_SLOTS);
return(mtr_read_ulint(rsegf + TRX_RSEG_UNDO_SLOTS +
n * TRX_RSEG_SLOT_SIZE, MLOG_4BYTES, mtr));
}
/*******************************************************************
Sets the file page number of the nth undo log slot. */
UNIV_INLINE
void
trx_rsegf_set_nth_undo(
/*===================*/
trx_rsegf_t* rsegf, /* in: rollback segment header */
ulint n, /* in: index of slot */
ulint page_no,/* in: page number of the undo log segment */
mtr_t* mtr) /* in: mtr */
{
ut_ad(n < TRX_RSEG_N_SLOTS);
mlog_write_ulint(rsegf + TRX_RSEG_UNDO_SLOTS + n * TRX_RSEG_SLOT_SIZE,
page_no, MLOG_4BYTES, mtr);
}
/********************************************************************
Looks for a free slot for an undo log segment. */
UNIV_INLINE
ulint
trx_rsegf_undo_find_free(
/*=====================*/
/* out: slot index or ULINT_UNDEFINED if not
found */
trx_rsegf_t* rsegf, /* in: rollback segment header */
mtr_t* mtr) /* in: mtr */
{
ulint i;
ulint page_no;
for (i = 0; i < TRX_RSEG_N_SLOTS; i++) {
page_no = trx_rsegf_get_nth_undo(rsegf, i, mtr);
if (page_no == FIL_NULL) {
return(i);
}
}
return(ULINT_UNDEFINED);
}