sysv_workers_stacks = xbt_new(ucontext_t, nthreads);
xbt_os_thread_key_create(&sysv_worker_id_key);
(*factory)->stop = smx_ctx_sysv_stop_parallel;
sysv_workers_stacks = xbt_new(ucontext_t, nthreads);
xbt_os_thread_key_create(&sysv_worker_id_key);
(*factory)->stop = smx_ctx_sysv_stop_parallel;