Yielding

[John Paquin <jpaquin@...>]

I know this has been covered before, but I can't seem to find it in the 
archives.

Is there any way to do a yield (or something like it) from c that has 
been called from Lua?

In my game, I want to do something like this from lua:

 player.newpath = pathfinder.makepath(pointa,pointb)

I want the Lua code to return only when it has a path.
On the c side, however, I want to add the makepath request to the 
pathfinder's queue, then "yield". 

The pathfinder would then complete the request incrementally while the 
game continues to run.  When the path is complete, the c code would then 
"resume" the Lua code.

Is there a way to do this?