Ruby-VPI 18.0.1

This release fixes some bugs regarding simulation time and control.

1.1  Thanks

• Calvin Wong reported the bugs listed in the Repairs section.

1.2  Repairs

• VCS does not acknowledge passage of time when cbReadWriteSynch callback is used, so I reverted back to using the cbAfterDelay callback (as was done in version 17.0.0).

• Ruby-VPI did not give control back to the Verilog simulator before it exited. As a result, the Verilog simulator did not have a chance to do any clean up or finish any pending tasks that remained in the simulation.