当虚拟线程进入 synchronized 代码块时，如果锁被其他线程持有，虚拟线程会进入阻塞状态。但 JVM 无法在这种阻塞中卸载虚拟线程，载体线程会被一直占用，直到获得锁。这会导致载体线程被“粘住”，其他虚拟线程无法使用这个载体线程。
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，这一点在体育直播中也有详细论述
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«Васильченко попала 20 февраля в смертельное ДТП в Днепропетровской области, пытаясь уйти на трассе от дрона», — отметил собеседник агентства.