在redisAsyncContext中，定义了structev:struct{void*data;void(*addRead)(void*privdata);void(*delRead)(void*privdata);void(*addWrite)(void*privdata);void(*delWrite)(void*privdata);void(*cleanup)(void*privdata);}ev;有一个函数:voidCleanUpEvent(){if(m_pstContext->ev.delRead){m_pstContext->ev.delRead(m_pstContext