If the application call the tpabort on a signal for handling? (Usignal used)

Hi all

And thanks in advance.

We perform testing of switching CARS.
All of our servers to signal SIGSEGV using Usignal.

We have 2 outstanding issues:

1 should we call tpabort after receiving a signal such as SIGSEGV (for services called by TMQFORWARD)?
* its like we shouldn't because we are not the owner of the transaction. (TMQFORWARD is the owner of the transaction)

2. should call the tpabort after receiving a signal such as SIGSEGV (for services to manually control the transaction IE tpbegin\tpcommit\tpabort call)?
* its as we should because we are the owner of the transaction.


Thank you very much
TechSgin

Hi TechSign,

Tuxedo adheres to the XA standard which requires enabled transaction semantics. Specifically what this means is:

1 tpabort() and tpcommit() can be done by the caller of tpbegin(), that is, the aborter or the validator of the transaction must be at the same level called tpbegin(). So yes, if your service has been called by TMQFORWARD and TMQFORWARD have started the operation, the only option that your service must abandon the transaction is to perform a tpreturn with TPFAIL as the return code.

2. all activities within the transaction must end before the tpabort() or tpcommit(). In other words, you can complete a transaction so that there is an exceptional activity such as service performed with tpacall() calls. This probably is not directly apply to you.

In all honesty, if you receive a SIGSEGV signal, shouldn't the server just roll up and die? I mean that you really want the server to continue processing requests if he tried to access a memory that he should not have consulted? In this case your signal handler must get out the entire process. If current service vehicle was in a transaction, the transaction will be marked rollback only and will fail to commit whenever the beginner of the transaction tries to validate the transactions (for example, a TRANSCENDING transaction).

Kind regards
Todd little
Chief Architect of Oracle Tuxedo

Tags: Fusion Middleware

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