我如何处理没有coroutine.yield()的Lua库？

但是,luasocket.http从不调用coroutine.yield().文件下载时,其他所有内容都会冻结.

这是一个说明性示例,我尝试同时下载文件并打印一些数字：

local http = require'socket.http'

local downloadRoutine = coroutine.create(function ()
    print 'Downloading large file'
    -- Download an example file
    local url = 'http://ipv4.download.thinkbroadband.com/5MB.zip'
    local result,status = http.request(url)
    print('FINISHED download ('..status..','..#result..'bytes)')
end)

local printRoutine = coroutine.create(function ()
    -- Print some numbers
    for i=1,10 do
        print(i)
        coroutine.yield()
    end
    print 'FINISHED printing numbers'
end)

repeat
    local printActive = coroutine.resume(printRoutine)
    local downloadActive = coroutine.resume(downloadRoutine)
until not downloadActive and not printActive
print 'Both done!'

运行它会产生这样的：

1
Downloading large file
FINISHED download (200,5242880bytes)
2
3
4
5
6
7
8
9
10
FINISHED printing numbers
Both done!

如您所见,printRoutine首先恢复.它打印数字1和产量.然后恢复downloadRoutine,下载整个文件,而不会屈服.只有这样才能打印其余的数字.

我不想写自己的套接字库！我能做什么？

编辑(当天晚些时候)：一些MUSH用户have also noticed.他们提供了有用的想法.