[sv-bc] Mailbox - null return

Hi, All -

This question came up in a class last week and I could not think of a 
good answer.

14.3.1 New()
Mailboxes are created with the new() method.
...
The new() function returns the mailbox handle or, if the mailbox 
cannot be created, null. ...

Under what circumstances could creating a mailbox fail and return null?

Regards - Cliff

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Cliff Cummings - Sunburst Design, Inc.
14314 SW Allen Blvd., PMB 501, Beaverton, OR 97005
Phone: 503-641-8446 / FAX: 503-641-8486
cliffc@sunburst-design.com / www.sunburst-design.com
Expert Verilog, SystemVerilog, Synthesis and Verification Training