背景：在很多情況下，主線程創(chuàng)建并啟動(dòng)子線程，如果子線程中要進(jìn)行大量的耗時(shí)運(yùn)算，主線程往往將早于子線程結(jié)束之前結(jié)束。這時(shí)，如果主線程想要等待子線程...
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