messenger fetch interrupt

Hallo,

I am reading the messages from the queue as follows:

Receiver r(_session.nextReceiver());
Message message(r.fetch(Duration::FOREVER d));

At some moment I want to interrupt the receiver using some signal.
From signal handler I invoke pthread_kill(SIGUSR1, pthread_self())
but fetch is not interrupted. Is it just not possible to interrupt
this function or am I doing something wrong?

I am using c++ qpidd 0.30

Best regards,