Add FrameMap delay_stat:

* Measure systematic delay drift between first and last items

include/SlsDetectorFrameMap.h

@@ -101,12 +101,16 @@ class FrameMap
 	FrameType getLastFinishedFrame() const
 	{ return getOldestFrame(getItemFrameArray()); }
 
+	XYStat::LinRegress calcDelayStat()
+	{ return m_delay_stat.calcLinRegress(); }
+
  private:
 	friend class Item;
 
 	struct AtomicCounter {
 		int count;
 		Mutex mutex;
+		Timestamp t0;
 
 		void set(int reset)
 		{
@@ -115,12 +119,17 @@ class FrameMap
 			mutex.unlock();
 		}
 
-		bool dec_test_and_reset(int reset)
+		bool dec_test_and_reset(int reset, double& delay)
 		{
 			mutex.lock();
+			Timestamp t = Timestamp::now();
+			if (count == reset)
+				t0 = t;
 			bool zero = (--count == 0);
-			if (zero)
+			if (zero) {
 				count = reset;
+				delay = t - t0;
+			}
 			mutex.unlock();
 			return zero;
 		}
@@ -132,6 +141,7 @@ class FrameMap
 	int m_buffer_size;
 	CounterList m_frame_item_count_list;
 	ItemList m_item_list;
+	XYStat m_delay_stat;
 };
 
 inline bool FrameMap::Item::isBadFrame(FrameType frame)

src/SlsDetectorCamera.cpp

@@ -210,6 +210,10 @@ void Camera::AcqThread::threadFunction()
 		m_cam->getStats(stats);
 		DEB_ALWAYS() << DEB_VAR1(stats);
 
+		FrameMap& m = m_cam->m_frame_map;
+		XYStat::LinRegress delay_stat = m.calcDelayStat();
+		DEB_ALWAYS() << DEB_VAR1(delay_stat);
+
 		if (had_frames) {
 			affinity_mgr.recvFinished();
 			affinity_mgr.waitLimaFinished();

src/SlsDetectorFrameMap.cpp

@@ -68,9 +68,12 @@ FrameMap::Item::frameFinished(FrameType frame, bool no_check, bool valid)
 	for (FrameType f = m_last_frame + 1; f != (frame + 1); ++f) {
 		int idx = f % m_map->m_buffer_size;
 		AtomicCounter& count = m_map->m_frame_item_count_list[idx];
-		bool finished = count.dec_test_and_reset(nb_items);
-		if (finished)
+		double delay;
+		bool finished = count.dec_test_and_reset(nb_items, delay);
+		if (finished) {
 			finfo.finished.insert(f);
+			m_map->m_delay_stat.add(frame, delay);
+		}
 	}
 
 	if (DEB_CHECK_ANY(DebTypeReturn)) {
@@ -133,6 +136,8 @@ void FrameMap::clear()
 	CounterList::iterator cit, cend = count_list.end();
 	for (cit = count_list.begin(); cit != cend; ++cit)
 		cit->set(m_nb_items);
+
+	m_delay_stat.reset();
 }
 
 FrameArray FrameMap::getItemFrameArray() const