size_t src_buff_size, int (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
void (*clean_fun)(void*), // used to free the synchro in case of problem after a detached send
void (*copy_data_fun)(smx_activity_t, void*, size_t), // used to copy data if not default one
size_t src_buff_size, int (*match_fun)(void*, void*, simgrid::kernel::activity::CommImpl*),
void (*clean_fun)(void*), // used to free the synchro in case of problem after a detached send
void (*copy_data_fun)(smx_activity_t, void*, size_t), // used to copy data if not default one