XBT_PRIVATE boost::intrusive_ptr<simgrid::kernel::activity::ActivityImpl> simcall_HANDLER_comm_irecv(smx_simcall_t simcall, 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);
XBT_PRIVATE void simcall_HANDLER_comm_send(smx_simcall_t simcall, 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);
XBT_PRIVATE boost::intrusive_ptr<simgrid::kernel::activity::ActivityImpl> simcall_HANDLER_comm_isend(smx_simcall_t simcall, 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);
-XBT_PRIVATE void simcall_HANDLER_comm_test(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl* comm);
+XBT_PRIVATE bool simcall_HANDLER_comm_test(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl* comm);
XBT_PRIVATE void simcall_HANDLER_comm_testany(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl** comms, size_t count);
XBT_PRIVATE void simcall_HANDLER_comm_waitany(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl** comms, size_t count, double timeout);
XBT_PRIVATE void simcall_HANDLER_comm_wait(smx_simcall_t simcall, simgrid::kernel::activity::CommImpl* comm, double timeout);