修复在threadDispatcher启用时，socket相关的读取造成的死锁问题 #665
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在threadDispatcherEnabled时，由于使用抢先式调度，会导致socketpair在其中一个线程在接收时，持续占用调度，导致永远无法接收到发送线程的信息。
同理，由于ppoll没有考虑io是否有信息可读，会导致线程持续卡死在后接的recv中，导致实际运行逻辑与实际不符，同时如果其他线程正在同一socket准备发送请求，也会造成死锁。
详细样例可见本fork的master分支