});
/* B1 and B2 read the value of the token received by their predecessors
and use it to adapt their amount of work to do.
*/
B1->on_this_start_cb([&](simgrid::plugins::Task* t) {
});
/* B1 and B2 read the value of the token received by their predecessors
and use it to adapt their amount of work to do.
*/
B1->on_this_start_cb([&](simgrid::plugins::Task* t) {