- {
- static sigset_t unblock_all_signals;
- n_fds_ready = epoll_pwait (em->epoll_fd,
- em->epoll_events,
- vec_len (em->epoll_events),
- timeout_ms, &unblock_all_signals);
-
- /* This kludge is necessary to run over absurdly old kernels */
- if (n_fds_ready < 0 && errno == ENOSYS)
- {
- n_fds_ready = epoll_wait (em->epoll_fd,
- em->epoll_events,
- vec_len (em->epoll_events), timeout_ms);
- }
- }
+ if (is_main || em->epoll_fd != -1)
+ {
+ static sigset_t unblock_all_signals;
+ n_fds_ready = epoll_pwait (em->epoll_fd,
+ em->epoll_events,
+ vec_len (em->epoll_events),
+ timeout_ms, &unblock_all_signals);
+
+ /* This kludge is necessary to run over absurdly old kernels */
+ if (n_fds_ready < 0 && errno == ENOSYS)
+ {
+ n_fds_ready = epoll_wait (em->epoll_fd,
+ em->epoll_events,
+ vec_len (em->epoll_events), timeout_ms);
+ }
+
+ }
+ else
+ {
+ /*
+ * Worker thread, no epoll fd's, sleep for 100us at a time
+ * and check for a barrier sync request
+ */
+ if (timeout_ms)
+ {
+ struct timespec ts, tsrem;
+ f64 limit = now + (f64) timeout_ms * 1e-3;
+
+ while (vlib_time_now (vm) < limit)
+ {
+ /* Sleep for 100us at a time */
+ ts.tv_sec = 0;
+ ts.tv_nsec = 1000 * 100;
+
+ while (nanosleep (&ts, &tsrem) < 0)
+ ts = tsrem;
+ if (*vlib_worker_threads->wait_at_barrier)
+ goto done;
+ }
+ }
+ goto done;
+ }