underlying VFS must support the "version 2" shared-memory.
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This was a principled engineering decision by the Erlang team, not a mistake. They recognized that pure isolation couldn’t meet real-world performance requirements and provided a carefully designed escape hatch.
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（2）虚拟线程开始执行 getCache()，执行到 Thread.sleep(50) 时，JVM 检测到这个操作会阻塞，于是：