On 18/02/2021 21:44, Nicolas George wrote:
Mark Thompson (12021-02-18):
When is the callback for an output stream called? What if it doesn't
have a packet available to write right now, but will do later?
It will be called when data has been written, of course. If there is no
data to write, the stream is just idle.
I wrote the last packet a second ago and got a callback for writeability from
the loop, but didn't have anything to write back then so I did nothing.
Now I have a packet to write, but the event loop is sitting idle in its poll()
call.
You've said I'm not allowed to interact with the loop from another thread, so
how do I make the loop generate a callback so I can write something on the
thread which is allowed to write?
- Mark
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