Function lua_resume

third-party/lua-5.2.4/src/ldo.c:535–564

LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs) {
  int status;
  int oldnny = L->nny;  /* save 'nny' */
  lua_lock(L);
  luai_userstateresume(L, nargs);
  L->nCcalls = (from) ? from->nCcalls + 1 : 1;
  L->nny = 0;  /* allow yields */
  api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs);
  status = luaD_rawrunprotected(L, resume, L->top - nargs);
  if (status == -1)  /* error calling 'lua_resume'? */
    status = LUA_ERRRUN;
  else {  /* yield or regular error */
    while (status != LUA_OK && status != LUA_YIELD) {  /* error? */
      if (recover(L, status))  /* recover point? */
        status = luaD_rawrunprotected(L, unroll, NULL);  /* run continuation */
      else {  /* unrecoverable error */
        L->status = cast_byte(status);  /* mark thread as `dead' */
        seterrorobj(L, status, L->top);
        L->ci->top = L->top;
        break;
      }
    }
    lua_assert(status == L->status);
  }
  L->nny = oldnny;  /* restore 'nny' */
  L->nCcalls--;
  lua_assert(L->nCcalls == ((from) ? from->nCcalls : 0));
  lua_unlock(L);
  return status;
}


LUA_API int lua_yieldk (lua_State *L, int nresults, int ctx, lua_CFunction k) {