exception-free non-blocking Queue/SizedQueue operations
I would like to reduce exceptions for non-blocking operations on
Queue/SizedQueue in the same way we are reducing exceptions for non-blocking
I/O with *_nonblock(..., exception: false) methods.
However, I'm unclear what the API would be, since queues return Ruby objects
instead of String buffers or number of bytes written, so any special
object/symbol we would return could conflict with existing applications.
Perhaps something like:
queue.pop(nonblock: :WAIT) queue.push(obj, nonblock: :WAIT)
Which would allow user to specify which object to raise when a queue is empty
or full (similar to Timeout.timeout allowing specific exception to raise).
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