Announcement with more details can be found here : http://permalink.gmane.org/gmane.comp.lang.lua.general/116266

cqueues is a library which (presumably) does the same sort of thing.

It’s well documented and avoids callback hell by using coroutines everywhere. It also provides a sane concurrency library with support for message passing concurrency! The syntax is a little noisy, but Lua is often like that. A crappy example:

local cqueues = require( "cqueues" )
local thread = require( "cqueues.thread" )
local cq = cqueues.new()

thread.start( function()
    local cqueues = require( "cqueues" )
    local cq = cqueues.new()

    cq:wrap( function()
        local i = 0
        while true do
            if i % 1000000 == 0 then
                print( "I'm counting: " .. i )
            end
            i = i + 1
        end
    end )

    cq:loop()
end )

cq:wrap( function()
    while true do
        print( "I'm not blocked!" )
        cqueues.sleep( 0.75 )
    end
end )

cq:loop()