Change need_read
and need_write
to return an error
#53
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This commit is targeted at solving tokio-rs/tokio-core#12 and incorporates the
solution from tokio-rs/tokio-core#17. Namely the
need_read
andneed_write
functions on
PollEvented
now return an error when the connected reactor hasgone away and the task cannot be blocked. This will typically naturally
translate to errors being returned by various connected I/O objects and should
help tear down the world in a clean-ish fashion.
This PR is based on #52, only the last commit needs to be reviewed.