Update lib ring buffer for external consumer

[lttng-ust.git] / libringbuffer / frontend_internal.h

diff --git a/libringbuffer/frontend_internal.h b/libringbuffer/frontend_internal.h
index 1fb08dfdec90d3f25e5f7ce85f39c010386badf4..a6b96c1a098ab089199cbc9d06f59549bcc4328f 100644 (file)
--- a/libringbuffer/frontend_internal.h
+++ b/libringbuffer/frontend_internal.h
@@ -376,7 +376,8 @@ void lib_ring_buffer_check_deliver(const struct lib_ring_buffer_config *config,
                         * RING_BUFFER_WAKEUP_BY_WRITER wakeup is not lock-free.
                         */
                        if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER
-                           && uatomic_read(&buf->active_readers)
+                           && (uatomic_read(&buf->active_readers)
+                               || uatomic_read(&buf->active_shadow_readers))
                            && lib_ring_buffer_poll_deliver(config, buf, chan, handle)) {
                                int wakeup_fd = shm_get_wakeup_fd(handle, &buf->self._ref);