%%cpp -d

void workItem0()
{
   printf("Running workItem0...\n");
}

ROOT::EnableImplicitMT(4);

ROOT::Experimental::TTaskGroup tg;

tg.Run(workItem0);
tg.Run([]() { printf("Running workItem1...\n"); });

printf("Running something in the \"main\" thread\n");

tg.Wait();

printf("All work completed.\n");

%jsroot on
gROOT->GetListOfCanvases()->Draw()