Feature #11307: exception-free non-blocking Queue#pop

• Status: Open
• Priority: Normal
• Assignee: matz (Yukihiro Matsumoto)
• Target version: -

[normalperson (Eric Wong)]

As we learned from the nonblocking IO APIs, exceptions are noisy with debugging
enabled and waste allocations on backtraces. We should have a better way to do
non-blocking Queue#pop without raising exceptions, but I don't know what the API
should be...