Berkeley DB

txn_prepare

						#include <db.h>
						int
						txn_prepare(DB_TXN *tid);
					

Description

The txn_prepare function initiates the beginning of a two-phase commit.

In a distributed transaction environment, Berkeley DB can be used as a local transaction manager. In this case, the distributed transaction manager must send prepare messages to each local manager. The local manager must then issue a txn_prepare and await its successful return before responding to the distributed transaction manager. Only after the distributed transaction manager receives successful responses from all of its prepare messages should it issue any commit messages.

In the case of nested transactions, preparing a parent transaction causes all unresolved children of the parent transaction ...