SILC FSM Interface implements a finite state machine.  The FSM can be
 used to implement all kinds of machines and protocols.  The FSM supports
 also threads and can be synchronized by using mutex locks.  The FSM
 also supports real system threads.  It is possible to create new FSM
 thread and then execute in real system thread, if platform supports
 threads.

 The FSM provides also asynchronous events that can be used to wait for
 some events or states to occur.  The FSM events may be used as condition
 variables and signallers.  The FSM events can safely be used in FSM
 threads that are executed in real system threads.

 To synchronize machines that use FSM threads that are executed in real
 system threads the SILC Mutex API (silcmutex.h) may be used.  Normal
 multi-threaded coding conventions apply when programming with real FSM
 threads.  If the FSM threads are not real system threads, synchronization
 is not required.