sc_mutex and sc_semaphore

The two classes sc_mutex and sc_semaphore are derived from
sc_prim_channel, implying that they cannot be instantiated dynamically
during simulation. This has always seemed an unnecessary restriction which
prevents the dynamic creation of mutexes and semaphores for use in
synchronizing dynamic processes.

How about we derive them from sc_object instead? This change would not
break anything, except where someone had derived their own primitive
channel from one of these classes, which seems unlikely.

Then again, perhaps no-one cares either way.

John A

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