Function lua_pushthread

third-party/lua-5.3.5/src/lapi.c:573–579

LUA_API int lua_pushthread (lua_State *L) {
  lua_lock(L);
  setthvalue(L, L->top, L);
  api_incr_top(L);
  lua_unlock(L);
  return (G(L)->mainthread == L);
}