hooks & coroutines
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- Subject: hooks & coroutines
- From: Andy Sloane <andy@...>
- Date: 2004年5月29日 01:16:00 -0500
Hello,
I just discovered that coroutines have their own independent set of
hooks, and don't inherit any from their creator, but I can't find where
it says so in the documentation.
Could the documentation perhaps make this obvious somehow, or am I just
blind? And is there an easy way to make coroutines inherit hooks upon
creation?
I guess one ridiculous solution that jumps out at me is this:
local old_cr_create = coroutine.create
function coroutine.create(fn)
local fn,mask,count = debug.gethook()
return old_cr_create(function(...)
debug.sethook(fn,mask,count)
return fn(unpack(arg))
end)
end
Except debug.gethook() returns the string "external hook" instead of a
function reference, because I did this in C. Argh! Well, I used a
variant of that continue my own work. So I guess I answered my own
question.
I'm working on an allocation profiler (without calling lua from inside
realloc() this time... :]) and I noticed that coroutine.resume() was
making lots of garbage, but of course it obviously wasn't, because none
of the coroutine functions showed up at all.
If others are interested I will clean it up and add it to the wiki; it
displays a flat profile showing the line numbers that allocated the most
live memory and the line numbers that generated the most garbage.
-Andy
(trivial demonstration of coroutines not invoking hooks below)
------------------------------------
function hookfn(trigger, line)
local info = debug.getinfo(2)
print((info.name or '?').."["..info.source..":"..line.."]")
end
function crfn()
local i
print('coroutine started')
for i=1,10 do
print('hi i am a coroutine '..i)
end
end
function test()
debug.sethook(hookfn, "l")
local x=1
x = x + 1
print('stuff')
local cr = coroutine.create(crfn)
coroutine.resume(cr)
end
test()