Only one thread (the initial thread) can access the JCICS API. You can
create other threads but you must route all requests to the JCICS API through
the initial thread. Additionally, you must ensure that all threads other
than the original thread have terminated before doing any of the following:
- link()
- xctl()
- setNextTransaction(), setNextCOMMAREA()
- commit(), rollback()
- returning an AbendException