int (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
void (*clean_fun)(void*),
void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t),
int (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
void (*clean_fun)(void*),
void (*copy_data_fun)(simgrid::kernel::activity::CommImpl*, void*, size_t),