boost::intrusive_ptr<simgrid::kernel::activity::ActivityImpl> comm_irecv(smx_actor_t receiver, smx_mailbox_t mbox, unsigned char* dst_buff, size_t* dst_buff_size, simix_match_func_t match_fun, simix_copy_data_func_t copy_data_fun, void* data, double rate);
void comm_send(smx_actor_t sender, smx_mailbox_t mbox, double task_size, double rate, unsigned char* src_buff, size_t src_buff_size, simix_match_func_t match_fun, simix_copy_data_func_t copy_data_fun, void* data, double timeout) [[block]];
boost::intrusive_ptr<simgrid::kernel::activity::ActivityImpl> comm_isend(smx_actor_t sender, smx_mailbox_t mbox, double task_size, double rate, unsigned char* src_buff, size_t src_buff_size, simix_match_func_t match_fun, simix_clean_func_t clean_fun, simix_copy_data_func_t copy_data_fun, void* data, bool detached);
-bool comm_test(simgrid::kernel::activity::CommImpl* comm) [[block]];
-int comm_testany(simgrid::kernel::activity::CommImpl** comms, size_t count) [[block]];
-int comm_waitany(simgrid::kernel::activity::CommImpl** comms, size_t count, double timeout) [[block]];
+bool comm_test(simgrid::kernel::activity::CommImpl* comm);
+ssize_t comm_testany(simgrid::kernel::activity::CommImpl** comms, size_t count);
+ssize_t comm_waitany(simgrid::kernel::activity::CommImpl** comms, size_t count, double timeout) [[block]];
void comm_wait(simgrid::kernel::activity::CommImpl* comm, double timeout) [[block]];
void run_kernel(std::function<void()> const* code) [[nohandler]];
