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Its the iterator.

See Coco http://luajit.luaforge.net/coco.html

for a description of what you cannot do with Lua coroutines

db

On 5/8/07, Sam Roberts <sroberts@bycast.com> wrote:

(with lua 5.0)

I'm baffled by a

  attempt to yield across metamethod/C-call boundary

error I'm getting. I'm not yielding across a C call, as best I can tell.

I have a C runtime that does a lua_getglobal("dipatch"), and calls
dispatch() with events. In lua, I do

        function main(msg)
            print(msg)
                for msg in wait do
                        print(msg)
                end
        end

        local _main=coroutine.wrap(main)
        function wait()
                return coroutine.yield()  -- <--- this is "attempt to yield across metamethod/C-call boundary"
        end
        function dispatch(msg)
                _main(msg)
        end

What is stranger, is that rewriting main() can remove the error, and run
fine, but I don't understand why:

  function main(msg)
           print(msg)
        msg = wait()
    print(msg)
        msg = wait()
    print(msg)
  end


Whats going on? Any ideas?

Cheers,
Sam