char *msg1 = static_cast<char*>(simgrid::s4u::this_actor::recv(mailbox));
char *msg2 = static_cast<char*>(simgrid::s4u::this_actor::recv(mailbox));
char *msg1 = static_cast<char*>(simgrid::s4u::this_actor::recv(mailbox));
char *msg2 = static_cast<char*>(simgrid::s4u::this_actor::recv(mailbox));