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Diffstat (limited to 'storage/xtradb/include/trx0trx.h')
-rw-r--r--storage/xtradb/include/trx0trx.h63
1 files changed, 34 insertions, 29 deletions
diff --git a/storage/xtradb/include/trx0trx.h b/storage/xtradb/include/trx0trx.h
index 4c0ce392bcd..ab7404c5eff 100644
--- a/storage/xtradb/include/trx0trx.h
+++ b/storage/xtradb/include/trx0trx.h
@@ -44,6 +44,9 @@ extern sess_t* trx_dummy_sess;
/** Number of transactions currently allocated for MySQL: protected by
the kernel mutex */
extern ulint trx_n_mysql_transactions;
+/** Number of transactions currently in the XA PREPARED state: protected by
+the kernel mutex */
+extern ulint trx_n_prepared;
/********************************************************************//**
Releases the search latch if trx has reserved it. */
@@ -108,6 +111,14 @@ trx_free(
/*=====*/
trx_t* trx); /*!< in, own: trx object */
/********************************************************************//**
+At shutdown, frees a transaction object that is in the PREPARED state. */
+UNIV_INTERN
+void
+trx_free_prepared(
+/*==============*/
+ trx_t* trx) /*!< in, own: trx object */
+ UNIV_COLD __attribute__((nonnull));
+/********************************************************************//**
Frees a transaction object for MySQL. */
UNIV_INTERN
void
@@ -214,12 +225,12 @@ trx_recover_for_mysql(
/*******************************************************************//**
This function is used to find one X/Open XA distributed transaction
which is in the prepared state
-@return trx or NULL */
+@return trx or NULL; on match, the trx->xid will be invalidated */
UNIV_INTERN
trx_t *
trx_get_trx_by_xid(
/*===============*/
- XID* xid); /*!< in: X/Open XA transaction identification */
+ const XID* xid); /*!< in: X/Open XA transaction identifier */
/**********************************************************************//**
If required, flushes the log to disk if we called trx_commit_for_mysql()
with trx->flush_log_later == TRUE.
@@ -408,30 +419,20 @@ Calculates the "weight" of a transaction. The weight of one transaction
is estimated as the number of altered rows + the number of locked rows.
@param t transaction
@return transaction weight */
-#define TRX_WEIGHT(t) \
- ut_dulint_add((t)->undo_no, UT_LIST_GET_LEN((t)->trx_locks))
+#define TRX_WEIGHT(t) ((t)->undo_no + UT_LIST_GET_LEN((t)->trx_locks))
/*******************************************************************//**
Compares the "weight" (or size) of two transactions. Transactions that
have edited non-transactional tables are considered heavier than ones
that have not.
-@return <0, 0 or >0; similar to strcmp(3) */
+@return TRUE if weight(a) >= weight(b) */
UNIV_INTERN
-int
-trx_weight_cmp(
-/*===========*/
+ibool
+trx_weight_ge(
+/*==========*/
const trx_t* a, /*!< in: the first transaction to be compared */
const trx_t* b); /*!< in: the second transaction to be compared */
-/*******************************************************************//**
-Retrieves transacion's id, represented as unsigned long long.
-@return transaction's id */
-UNIV_INLINE
-ullint
-trx_get_id(
-/*=======*/
- const trx_t* trx); /*!< in: transaction */
-
/* Maximum length of a string that can be returned by
trx_get_que_state_str(). */
#define TRX_QUE_STATE_STR_MAX_LEN 12 /* "ROLLING BACK" */
@@ -480,6 +481,20 @@ struct trx_struct{
of view of concurrency control:
TRX_ACTIVE, TRX_COMMITTED_IN_MEMORY,
... */
+ /*------------------------------*/
+ /* MySQL has a transaction coordinator to coordinate two phase
+ commit between multiple storage engines and the binary log. When
+ an engine participates in a transaction, it's responsible for
+ registering itself using the trans_register_ha() API. */
+ unsigned is_registered:1;/* This flag is set to 1 after the
+ transaction has been registered with
+ the coordinator using the XA API, and
+ is set to 0 after commit or rollback. */
+ unsigned owns_prepare_mutex:1;/* 1 if owns prepare mutex, if
+ this is set to 1 then registered should
+ also be set to 1. This is used in the
+ XA code */
+ /*------------------------------*/
ulint isolation_level;/* TRX_ISO_REPEATABLE_READ, ... */
ulint check_foreigns; /* normally TRUE, but if the user
wants to suppress foreign key checks,
@@ -497,7 +512,6 @@ struct trx_struct{
FALSE, one can save CPU time and about
150 bytes in the undo log size as then
we skip XA steps */
- ulint flush_log_at_trx_commit_session;
ulint flush_log_later;/* In 2PC, we hold the
prepare_commit mutex across
both phases. In that case, we
@@ -511,9 +525,6 @@ struct trx_struct{
in that case we must flush the log
in trx_commit_complete_for_mysql() */
ulint duplicates; /*!< TRX_DUP_IGNORE | TRX_DUP_REPLACE */
- ulint active_trans; /*!< 1 - if a transaction in MySQL
- is active. 2 - if prepare_commit_mutex
- was taken */
ulint has_search_latch;
/* TRUE if this trx has latched the
search system latch in S-mode */
@@ -556,8 +567,8 @@ struct trx_struct{
max trx id when the transaction is
moved to COMMITTED_IN_MEMORY state */
ib_uint64_t commit_lsn; /*!< lsn at the time of the commit */
- trx_id_t table_id; /*!< Table to drop iff dict_operation
- is TRUE, or ut_dulint_zero. */
+ table_id_t table_id; /*!< Table to drop iff dict_operation
+ is TRUE, or 0. */
/*------------------------------*/
void* mysql_thd; /*!< MySQL thread handle corresponding
to this trx, or NULL */
@@ -583,12 +594,6 @@ struct trx_struct{
replication has processed */
const char* mysql_relay_log_file_name;
ib_int64_t mysql_relay_log_pos;
-
- os_thread_id_t mysql_thread_id;/* id of the MySQL thread associated
- with this transaction object */
- ulint mysql_process_no;/* since in Linux, 'top' reports
- process id's and not thread id's, we
- store the process number too */
/*------------------------------*/
ulint n_mysql_tables_in_use; /* number of Innobase tables
used in the processing of the current