Every VM that has debugging enabled starts a "JDWP" thread. The thread typically sits idle until DDMS or a debugger connects.

任何调试状态的vm都启动一个jdwp线程，该线程处于空闲状态直到DDMS或者调试器连接它。

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The JDWP protocol is stateless, so the VM handles individual debugger requests as they arrive, and posts events to the debugger as they happen.

JDWP协议是无状态的，因此vm在调试器请求到来的时候就处理，在发生事件的时候就发送给vm。

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