This release adds support for Ruby 1.9.0 and, in an awesome twist of fate, breaks compatibility with Cadence NC-Sim while restoring compatibility with Mentor Modelsim.

1  Caution

Cadence NC-Sim is not compatible with this release.

2  Improvements

• Added support for Ruby 1.9.0 by replacing the pthreads-based relay implementation with a simpler that uses rb_create_thread() for stack decoupling and Ruby’s thread-safe Queue class for synchronization. See this blog entry for details about the implementation.

One side benefit of this change is that it restored support for Mentor Modelsim. On the other hand, it also broke support for Cadence NC-Sim, as mentioned above.

• The POSIX threads library (pthreads) is no longer required by Ruby-VPI.

3  Repairs

The pipelined ALU example (one of my homework assignments which motivated the creation of Ruby-VPI) has been removed because it was buggy. Farewell, old friend!