BEGIN strange behaviour

Hi All.
I've sperimented a strange behaviour using the command BEGIN and COMMIT in a
multi-threaded Linux environment.
In one of the two thread I use I've got the following message after
PQexec(myconn, "BEGIN;");

WARNING: there is already a transaction in progress

And after the command PQexec(myconn, "COMMIT;"); (always in the same
thread)

I've got the message

WARNING: there is no transaction in progress.

After these warnings the elaboration is freezing when the next PQexec is
encoutered.

I have the same behaviour even if the second thread is operating on a
different table than the first thread.

The same commands (inside the same code) runs fine in Windows and in MacOS
X.

Any Idea?

Thanks in advance.

Luca.

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