I created a queue in my Env class. I want to pass the queue by reference to other objects I create in my Env class so that each object is referring to the same queue. However, it seems that my queue is simply copied from the Env object to the other objects i.e., I can pop elements from the queue in one object, but they still remain on the the queue in other objects. The "ref" I've used in front of the queue argument in my function seems to have no effect... thoughts?

Thanks,

-Greg

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bit [ 6:0 ] my_Q[ $ ]
function new( ..., ref bit [ 6:0 ] myQ[ $ ], ... );

my_Q = myQ;

endfunction

Greg,
To the best of my knowledge, what you're doing is semantically correct and should hence work. Perhaps reference arguments aren't fully supported yet by all simulators. Have you checked the release notes of your preferred SystemVerilog simulator?

If you find that there is truly something we are overlooking here, please be sure to check back into the forum to share this.

Regards,
Hans

I see now... I'm still getting my head around the subtle differences between C++ pointers and SystemVerilog handles and ref-s.

I did as suggested and created a class which holds the required queue. I'm then able to pass the handle of the instantiated queue-class object around such that it becomes a shared resource for various threads (along with a semaphore so they don't stomp on each other). This has lots of other benefits since the init of the queue neatly takes place within its new() constructor and adding other elements to the class later which might be required becomes trivial.

Thanks for the feedback.

-Greg