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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
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/******************************************************
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Cursor read
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(c) 1997 Innobase Oy
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Created 2/16/1997 Heikki Tuuri
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*******************************************************/
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#ifndef read0read_h
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#define read0read_h
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#include "univ.i"
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#include "ut0byte.h"
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#include "ut0lst.h"
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#include "trx0trx.h"
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#include "read0types.h"
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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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read_view_t*
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read_view_open_now(
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/*===============*/
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/* out, own: read view struct */
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trx_t* cr_trx, /* in: creating transaction, or NULL */
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mem_heap_t* heap); /* in: memory heap from which allocated */
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/*************************************************************************
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Makes a copy of the oldest existing read view, or opens a new. The view
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must be closed with ..._close. */
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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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/* out, own: read view struct */
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trx_t* cr_trx, /* in: creating transaction, or NULL */
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mem_heap_t* heap); /* in: memory heap from which allocated */
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/*************************************************************************
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Closes a read view. */
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void
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read_view_close(
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/*============*/
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read_view_t* view); /* in: read view */
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/*************************************************************************
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Checks if a read view sees the specified transaction. */
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UNIV_INLINE
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ibool
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read_view_sees_trx_id(
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/*==================*/
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/* out: TRUE if sees */
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read_view_t* view, /* in: read view */
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dulint trx_id); /* in: trx id */
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/* Read view lists the trx ids of those transactions for which a consistent
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read should not see the modifications to the database. */
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struct read_view_struct{
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ibool can_be_too_old; /* TRUE if the system has had to purge old
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versions which this read view should be able
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to access: the read view can bump into the
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DB_MISSING_HISTORY error */
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dulint low_limit_no; /* The view does not need to see the undo
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logs for transactions whose transaction number
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is strictly smaller (<) than this value: they
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can be removed in purge if not needed by other
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views */
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dulint low_limit_id; /* The read should not see any transaction
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with trx id >= this value */
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dulint up_limit_id; /* The read should see all trx ids which
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are strictly smaller (<) than this value */
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ulint n_trx_ids; /* Number of cells in the trx_ids array */
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dulint* trx_ids; /* Additional trx ids which the read should
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not see: typically, these are the active
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transactions at the time when the read is
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serialized, except the reading transaction
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itself; the trx ids in this array are in a
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descending order */
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trx_t* creator; /* Pointer to the creating transaction, or
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NULL if used in purge */
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UT_LIST_NODE_T(read_view_t) view_list;
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/* List of read views in trx_sys */
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};
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#ifndef UNIV_NONINL
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#include "read0read.ic"
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#endif
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#endif
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