[Tarantool-patches] [PATCH v4 02/12] txm: add TX status
Aleksandr Lyapunov
alyapunov at tarantool.org
Tue Sep 8 13:22:02 MSK 2020
Transaction engine (see further commits) needs to distinguish and
maniputate transactions by their status. The status describe the
lifetime point of a transaction (inprogress, prepared, committed)
and its abilities (conflicted, read view).
Part of #4897
Part of #5108
---
src/box/txn.c | 5 +++++
src/box/txn.h | 36 ++++++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff --git a/src/box/txn.c b/src/box/txn.c
index b2d3423..093808a 100644
--- a/src/box/txn.c
+++ b/src/box/txn.c
@@ -224,6 +224,7 @@ txn_begin(void)
txn->flags = 0;
txn->in_sub_stmt = 0;
txn->id = ++tsn;
+ txn->status = TXN_INPROGRESS;
txn->signature = TXN_SIGNATURE_ROLLBACK;
txn->engine = NULL;
txn->engine_tx = NULL;
@@ -449,6 +450,7 @@ txn_complete(struct txn *txn)
* IPROTO_NOP or IPROTO_CONFIRM statements.
*/
if (txn->signature < 0) {
+ txn->status = TXN_ABORTED;
/* Undo the transaction. */
struct txn_stmt *stmt;
stailq_reverse(&txn->stmts);
@@ -459,6 +461,7 @@ txn_complete(struct txn *txn)
if (txn_has_flag(txn, TXN_HAS_TRIGGERS))
txn_run_rollback_triggers(txn, &txn->on_rollback);
} else if (!txn_has_flag(txn, TXN_WAIT_SYNC)) {
+ txn->status = TXN_COMMITTED;
/* Commit the transaction. */
if (txn->engine != NULL)
engine_commit(txn->engine, txn);
@@ -656,6 +659,7 @@ txn_prepare(struct txn *txn)
trigger_clear(&txn->fiber_on_yield);
txn->start_tm = ev_monotonic_now(loop());
+ txn->status = TXN_PREPARED;
return 0;
}
@@ -872,6 +876,7 @@ void
txn_rollback(struct txn *txn)
{
assert(txn == in_txn());
+ txn->status = TXN_ABORTED;
trigger_clear(&txn->fiber_on_stop);
if (!txn_has_flag(txn, TXN_CAN_YIELD))
trigger_clear(&txn->fiber_on_yield);
diff --git a/src/box/txn.h b/src/box/txn.h
index 36b1a03..35e1ab9 100644
--- a/src/box/txn.h
+++ b/src/box/txn.h
@@ -121,6 +121,40 @@ enum {
};
/**
+ * Status of a transaction.
+ */
+enum txn_status {
+ /**
+ * Initial state of TX. The only state of a TX that allowed to do
+ * read or write actions.
+ */
+ TXN_INPROGRESS,
+ /**
+ * The TX have passed conflict checks and is ready to be committed.
+ */
+ TXN_PREPARED,
+ /**
+ * The TX was aborted when other TX was committed due to conflict.
+ */
+ TXN_CONFLICTED,
+ /**
+ * The TX was read_only, has a conflict and was sent to read view.
+ * Read-only and does not participate in conflict resolution ever more.
+ * This transaction can only see a state of the database at some fixed
+ * point in the past.
+ */
+ TXN_IN_READ_VIEW,
+ /**
+ * The TX was committed.
+ */
+ TXN_COMMITTED,
+ /**
+ * The TX was aborted.
+ */
+ TXN_ABORTED,
+};
+
+/**
* A single statement of a multi-statement
* transaction: undo and redo info.
*/
@@ -217,6 +251,8 @@ struct txn {
* Valid IDs start from 1.
*/
int64_t id;
+ /** Status of the TX */
+ enum txn_status status;
/** List of statements in a transaction. */
struct stailq stmts;
/** Number of new rows without an assigned LSN. */
--
2.7.4
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