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examples/lua: attempt to highlight some traps

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Ran into some issues with my fd event being garbage collected.  As I
never wanted to call :delete, I had seen no reason to keep the returned
object, as my callback and upvalues were still valid.

Signed-off-by: Karl Palsson <karlp@etactica.com>
This commit is contained in:
Karl Palsson 2020-06-30 10:38:44 +00:00 committed by Petr Štetiar
parent 53b9a2123f
commit f4e9bf73ac
1 changed files with 5 additions and 3 deletions
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8
examples/uloop-example.lua
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@ -9,7 +9,7 @@ local udp = socket.udp()
udp:settimeout(0) udp:settimeout(0)
udp:setsockname('*', 8080) udp:setsockname('*', 8080)
-- timer example 1 -- timer example 1 (will run repeatedly)
local timer local timer
function t() function t()
print("1000 ms timer run"); print("1000 ms timer run");
@ -18,10 +18,10 @@ end
timer = uloop.timer(t) timer = uloop.timer(t)
timer:set(1000) timer:set(1000)
-- timer example 2 -- timer example 2 (will run once)
uloop.timer(function() print("2000 ms timer run"); end, 2000) uloop.timer(function() print("2000 ms timer run"); end, 2000)
-- timer example 3 -- timer example 3 (will never run)
uloop.timer(function() print("3000 ms timer run"); end, 3000):cancel() uloop.timer(function() print("3000 ms timer run"); end, 3000):cancel()
-- process -- process
@ -46,6 +46,8 @@ uloop.timer(
end, 2000 end, 2000
) )
-- Keep udp_ev reference, events will be gc'd, even if the callback is still referenced
-- .delete will manually untrack.
udp_ev = uloop.fd_add(udp, function(ufd, events) udp_ev = uloop.fd_add(udp, function(ufd, events)
local words, msg_or_ip, port_or_nil = ufd:receivefrom() local words, msg_or_ip, port_or_nil = ufd:receivefrom()
print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words) print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)