Background compiles give way to the lander: the Logbook statistics and the results refresher wait while [logbook] lander_lock is fresh (under 60 min); the statistics tools run below normal priority and a timeout ends the whole tree (an orphaned cl.exe went on compiling main at normal priority); a retried statistics run no longer relogs the same commits

tests/test_results_refresh.py

@@ -208,6 +208,19 @@ class Refresher(HarborCase):
         rr.save_state(self.h.project, st)
         self.assertIsNone(rr.freshness(self.h.project)["match"]["sha"])
 
+    def test_waits_while_the_lander_runs_its_gates(self):
+        lock = self.dir / "lander-busy.lock"
+        self.h.project.logbook["lander_lock"] = str(lock)
+        lock.write_text("lander", encoding="utf-8")
+        os.utime(lock, (T0 - 300, T0 - 300))
+        rr.request(self.h.project, "match")
+        out = rr.tick(self.h.project, now=T0, hour=12)
+        self.assertIn("lander", out["waiting"])
+        self.assertEqual(self.calls, [])
+        self.assertEqual(rr._requested(self.h.project), {"match"})             # kept for the next look
+        self.assertTrue(rr.tick(self.h.project, now=T0 + 61 * 60, hour=12)["ok"])   # a lock over an hour old is stale
+        self.assertEqual(len(self.calls), 1)
+
     def test_runs_at_idle_priority(self):
         seen = {}