6e1bbc446b
CF_READ_NULL flag is not really useful and used. It is a transient event used to wakeup the stream. As we will see, all read events on a channel may be resumed to only one and are all used to wake up the stream. In this patch, we introduce CF_READ_EVENT flag as a replacement to CF_READ_NULL. There is no breaking change for now, it is just a rename. Gradually, other read events will be merged with this one.