2005-10-27 07:29:40 +00:00
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/******************************************************
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The transaction lock system global types
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(c) 1996 Innobase Oy
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Created 5/7/1996 Heikki Tuuri
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*******************************************************/
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#ifndef lock0types_h
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#define lock0types_h
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#define lock_t ib_lock_t
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typedef struct lock_struct lock_t;
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typedef struct lock_sys_struct lock_sys_t;
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branches/zip: Fast index creation: Remove the ROW_PREBUILT_OBSOLETE nonsense.
Active transactions must not switch table or index definitions on the fly,
for several reasons, including the following:
* copied indexes do not carry any history or locking information;
that is, rollbacks, read views, and record locking would be broken
* huge potential for race conditions, inconsistent reads and writes,
loss of data, and corruption
Instead of trying to track down if the table was changed during a transaction,
acquire appropriate locks that protect the creation and dropping of indexes.
innodb-index.test: Test the locking of CREATE INDEX and DROP INDEX. Test
that consistent reads work across dropped indexes.
lock_rec_insert_check_and_lock(): Relax the lock_table_has() assertion.
When inserting a record into an index, the table must be at least IX-locked.
However, when an index is being created, an IS-lock on the table is
sufficient.
row_merge_lock_table(): Add the parameter enum lock_mode mode, which must
be LOCK_X or LOCK_S.
row_merge_drop_table(): Assert that n_mysql_handles_opened == 0.
Unconditionally drop the table.
ha_innobase::add_index(): Acquire an X or S lock on the table, as appropriate.
After acquiring an X lock, assert that n_mysql_handles_opened == 1.
Remove the comments about dropping tables in the background.
ha_innobase::final_drop_index(): Acquire an X lock on the table.
dict_table_t: Remove version_number, to_be_dropped, and prebuilts.
ins_node_t: Remove table_version_number.
enum lock_mode: Move the definition from lock0lock.h to lock0types.h.
ROW_PREBUILT_OBSOLETE, row_update_prebuilt(), row_prebuilt_table_obsolete():
Remove.
row_prebuilt_t: Remove the declaration from row0types.h.
row_drop_table_for_mysql_no_commit(): Always print a warning if a table
was added to the background drop queue.
2007-12-17 15:49:59 +00:00
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/* Basic lock modes */
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enum lock_mode {
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LOCK_IS = 0, /* intention shared */
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LOCK_IX, /* intention exclusive */
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LOCK_S, /* shared */
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LOCK_X, /* exclusive */
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LOCK_AUTO_INC, /* locks the auto-inc counter of a table
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in an exclusive mode */
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LOCK_NONE, /* this is used elsewhere to note consistent read */
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LOCK_NUM = LOCK_NONE/* number of lock modes */
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};
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2006-02-23 19:25:29 +00:00
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#endif
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