How do we implement a 𝐧𝐨𝐧-𝐛𝐥𝐨𝐜𝐤𝐢𝐧𝐠 queue? What are the differences between blocking and non-blocking algorithms?

How do we implement a 𝐧𝐨𝐧-𝐛𝐥𝐨𝐜𝐤𝐢𝐧𝐠 queue? What are the differences between blocking and non-blocking algorithms?