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Tobias Markmann wrote:
lua_yield(L, 0);

printf("After yield\n");

return 0;

If I understood correctly, here's what the manual says of lua_yield():

  This function should only be called as the return expression
  of a C function, as follows:

    return lua_yield (L, nresults);

You can't insert a printf after the yield. If you have to, return normally and do a coroutine.yield on the Lua side (I used both methods and they work fine).