Transaction Manager Objects

The main purpose of the transaction manager object is to create and maintain a Common Log File System (CLFS) log stream that KTM uses to record status information about transactions.

The transaction manager object also contains a virtual clock value that KTM maintains and uses to sequence information in the object's log stream.

KTM provides a set of transaction manager object routines that kernel-mode TPS components can call. KTM also provides a similar set of user-mode routines that user-mode applications can call. For more information about the user-mode routines, see the Microsoft Windows SDK.

KTM creates a transaction manager object when a resource manager calls ZwCreateTransactionManager. Typically, each resource manager in a TPS creates a transaction manager object. But you can also design a TPS in which several resource managers share a single transaction manager object.

TPS components can open additional handles to an existing transaction manager object by calling ZwOpenTransactionManager. For example, if your TPS has several resource managers that share a single transaction manager object, one resource manager calls ZwCreateTransactionManager and then passes the object GUID to the other resource managers so that they can call ZwOpenTransactionManager.

Resource managers close their handles to transaction manager objects by calling ZwClose.

The operating system deletes the object after the last handle is closed and KTM has released all its references to the object.

 

 

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