Right now, you can grab the iPad Air with M3 chip for $489.99 at Amazon. That's 18% off the $599 list price for $109.01 in savings. This isn't the lowest price ever on the iPad Air. During Black Friday, it reached an all-time low of $449, but this current deal price is just $40 more. Not bad savings considering we're not sure how much longer the M3 iPad Air with hang around once the M4 is released.
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线程池中，当一个工作线程因为等待某个结果而阻塞时，它就「消失」了——不再能执行任何任务。如果多个线程同时阻塞，线程池可能陷入「所有线程都在等、没人干活」的死局。，这一点在夫子中也有详细论述
Where to Buy: $129 $89 at Walmart