prosody
937de0c39279
util/async.lua

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util/async.lua @ 8611:937de0c39279

util.async: Add comment
author Matthew Wild <mwild1@gmail.com>
date Fri, 16 Mar 2018 22:31:12 +0000
parent 8610:b03c7884fade
child 8613:dbb4788db8e3
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8610:b03c7884fade 8611:937de0c39279
19 if not ok then 19 if not ok then
20 local err = state; 20 local err = state;
21 -- Running the coroutine failed, which means we have to find the runner manually, 21 -- Running the coroutine failed, which means we have to find the runner manually,
22 -- in order to inform the error handler 22 -- in order to inform the error handler
23 local level = 0; 23 local level = 0;
24 -- Find the 'level' of the top-most function (0 == current level, 1 == caller, ...)
24 while debug.getinfo(thread, level, "") do level = level + 1; end 25 while debug.getinfo(thread, level, "") do level = level + 1; end
25 ok, runner = debug.getlocal(thread, level-1, 1); 26 ok, runner = debug.getlocal(thread, level-1, 1);
26 assert(ok == "self", "unexpected async state: variable mismatch"); 27 assert(ok == "self", "unexpected async state: variable mismatch");
27 assert(runner.thread == thread, "unexpected async state: thread mismatch"); 28 assert(runner.thread == thread, "unexpected async state: thread mismatch");
28 local error_handler = runner.watchers.error; 29 local error_handler = runner.watchers.error;