该事件发生在北京的一所学校。，突如其来的大雪笼罩着整个校园。当班主任正准备给学生上一堂文化课时，一位体育老师小心翼翼地敲响了门。他请求：“可以借用一节课吗？”班主任随即回答道：“那么这节课由你来上。”
Following on from a discussion which got going in the comments of this question. How would one go about writing a Spinlock without CAS operations?
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