Yielding coroutines from C using coco patch

[Tobias Markmann <tmarkmann@...>]

Hi,

I'm writing an application which enables users scripts to be executed, multiple in parallel. So each script has its own lua_State. Now i want to provide those scripts a function they can call to be continued later, for example wait(60) to wait 60 seconds and then be resumed. My idea was to just yield those scripts from C and resume them after 60 seconds. That way they won't need to wait in a locking way in its own OS thread.

Though what happens when I try to execute my wait C function from Lua which is build like,

> lua_yield(L, 0);
> printf("After yield\n");
> return 0;

  , is that i get the following error:

> attempt to yield across metamethod/C-call boundary
> stack traceback:
> 	[C]: in function 'wait'

I thought with the coro patch from luajit.org something like this is possible. So my question is: How to yield/resume the right way from C? 

Cheers,

Tobias