boost::intrusive_ptr<simgrid::kernel::activity::ExecImpl> execution_start(const char* name, double flops_amount, double priority, double bound);
boost::intrusive_ptr<simgrid::kernel::activity::ExecImpl> execution_parallel_start(const char* name, int host_nb, sg_host_t* host_list, double* flops_amount, double* bytes_amount, double rate, double timeout) [[nohandler]];
boost::intrusive_ptr<simgrid::kernel::activity::ExecImpl> execution_start(const char* name, double flops_amount, double priority, double bound);
boost::intrusive_ptr<simgrid::kernel::activity::ExecImpl> execution_parallel_start(const char* name, int host_nb, sg_host_t* host_list, double* flops_amount, double* bytes_amount, double rate, double timeout) [[nohandler]];