tests: Change how we wait for an orientation change

Previously, we were waiting up to 300ms for the signal, then proceeding
anyway. However, 300ms is not necessarily long enough to wait on an
autobuilder that might be heavily loaded, particularly if it's a non-x86
with different performance characteristics.

Conversely, if mutter responds to the D-Bus signal from the mock sensor
before we have connected to the signal, then we cannot expect to receive
the signal - it was already emitted, but we missed it. In this case, we
need to avoid waiting.

One remaining use of wait_for_orientation_changes() that would previously
always have timed out was in
meta_test_orientation_manager_has_accelerometer(), which does not
actually expect to see an orientation-changed signal. Make this wait
for the accelerometer to be detected instead.

Resolves: https://gitlab.gnome.org/GNOME/mutter/-/issues/1967
Bug-Debian: https://bugs.debian.org/995929
Signed-off-by: Simon McVittie <smcv@debian.org>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2049>

src/tests/monitor-unit-tests.c

@@ -3558,7 +3558,7 @@ meta_sensors_proxy_reset (MetaSensorsProxyMock *proxy)
 
   meta_sensors_proxy_mock_set_orientation (proxy,
                                            META_ORIENTATION_NORMAL);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, META_ORIENTATION_NORMAL, NULL);
   g_object_unref (proxy);
 }
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (MetaSensorsProxyAutoResetMock,
@@ -3876,16 +3876,14 @@ meta_test_monitor_orientation_initial_rotated (void)
   g_autoptr (MetaSensorsProxyAutoResetMock) orientation_mock = NULL;
   g_autoptr (ClutterAutoRemoveInputDevice) touch_device = NULL;
   MetaOrientation orientation;
+  unsigned int times_signalled = 0;
 
   orientation_mock = meta_sensors_proxy_mock_get ();
   touch_device = meta_test_add_touch_device (backend);
   orientation = META_ORIENTATION_LEFT_UP;
   meta_sensors_proxy_mock_set_orientation (orientation_mock, orientation);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, orientation, &times_signalled);
-  g_assert_cmpuint (
+  g_assert_cmpuint (times_signalled, <=, 1);
-    meta_orientation_manager_get_orientation (orientation_manager),
-    ==,
-    orientation);
 
   test_setup = create_monitor_test_setup (&test_case.setup,
                                           MONITOR_TEST_FLAG_NO_STORED);
@@ -3984,15 +3982,13 @@ meta_test_monitor_orientation_initial_rotated_no_touch_mode (void)
     meta_backend_get_orientation_manager (backend);
   g_autoptr (MetaSensorsProxyAutoResetMock) orientation_mock = NULL;
   MetaOrientation orientation;
+  unsigned int times_signalled = 0;
 
   orientation_mock = meta_sensors_proxy_mock_get ();
   orientation = META_ORIENTATION_LEFT_UP;
   meta_sensors_proxy_mock_set_orientation (orientation_mock, orientation);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, orientation, &times_signalled);
-  g_assert_cmpuint (
+  g_assert_cmpuint (times_signalled, <=, 1);
-    meta_orientation_manager_get_orientation (orientation_manager),
-    ==,
-    orientation);
 
   test_setup = create_monitor_test_setup (&test_case.setup,
                                           MONITOR_TEST_FLAG_NO_STORED);
@@ -4094,6 +4090,7 @@ meta_test_monitor_orientation_initial_stored_rotated (void)
   g_autoptr (MetaSensorsProxyAutoResetMock) orientation_mock = NULL;
   g_autoptr (ClutterAutoRemoveInputDevice) touch_device = NULL;
   MetaOrientation orientation;
+  unsigned int times_signalled = 0;
 
   if (!meta_is_stage_views_enabled ())
     {
@@ -4105,11 +4102,8 @@ meta_test_monitor_orientation_initial_stored_rotated (void)
   touch_device = meta_test_add_touch_device (backend);
   orientation = META_ORIENTATION_RIGHT_UP;
   meta_sensors_proxy_mock_set_orientation (orientation_mock, orientation);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, orientation, &times_signalled);
-  g_assert_cmpuint (
+  g_assert_cmpuint (times_signalled, <=, 1);
-    meta_orientation_manager_get_orientation (orientation_manager),
-    ==,
-    orientation);
 
   test_setup = create_monitor_test_setup (&test_case.setup,
                                           MONITOR_TEST_FLAG_NONE);
@@ -4131,11 +4125,8 @@ meta_test_monitor_orientation_initial_stored_rotated (void)
 
   orientation = META_ORIENTATION_LEFT_UP;
   meta_sensors_proxy_mock_set_orientation (orientation_mock, orientation);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, orientation, &times_signalled);
-  g_assert_cmpuint (
+  g_assert_cmpuint (times_signalled, <=, 1);
-    meta_orientation_manager_get_orientation (orientation_manager),
-    ==,
-    orientation);
 
   meta_backend_test_set_is_lid_closed (META_BACKEND_TEST (backend), FALSE);
   meta_monitor_manager_lid_is_closed_changed (monitor_manager);
@@ -4150,11 +4141,8 @@ meta_test_monitor_orientation_initial_stored_rotated (void)
 
   orientation = META_ORIENTATION_RIGHT_UP;
   meta_sensors_proxy_mock_set_orientation (orientation_mock, orientation);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, orientation, &times_signalled);
-  g_assert_cmpuint (
+  g_assert_cmpuint (times_signalled, <=, 1);
-    meta_orientation_manager_get_orientation (orientation_manager),
-    ==,
-    orientation);
 
   META_TEST_LOG_CALL ("Checking configuration per orientation",
                       check_monitor_configuration_per_orientation (
@@ -4252,6 +4240,7 @@ meta_test_monitor_orientation_initial_stored_rotated_no_touch (void)
     meta_backend_get_orientation_manager (backend);
   g_autoptr (MetaSensorsProxyAutoResetMock) orientation_mock = NULL;
   MetaOrientation orientation;
+  unsigned int times_signalled = 0;
 
   if (!meta_is_stage_views_enabled ())
     {
@@ -4262,11 +4251,8 @@ meta_test_monitor_orientation_initial_stored_rotated_no_touch (void)
   orientation_mock = meta_sensors_proxy_mock_get ();
   orientation = META_ORIENTATION_RIGHT_UP;
   meta_sensors_proxy_mock_set_orientation (orientation_mock, orientation);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, orientation, &times_signalled);
-  g_assert_cmpuint (
+  g_assert_cmpuint (times_signalled, <=, 1);
-    meta_orientation_manager_get_orientation (orientation_manager),
-    ==,
-    orientation);
 
   test_setup = create_monitor_test_setup (&test_case.setup,
                                           MONITOR_TEST_FLAG_NONE);
@@ -4383,6 +4369,7 @@ meta_test_monitor_orientation_changes (void)
   g_autoptr (MetaMonitorsConfig) initial_config = NULL;
   g_autoptr (MetaMonitorsConfig) previous_config = NULL;
   MetaOrientation i;
+  unsigned int times_signalled = 0;
 
   orientation_mock = meta_sensors_proxy_mock_get ();
   touch_device = meta_test_add_touch_device (backend);
@@ -4406,10 +4393,8 @@ meta_test_monitor_orientation_changes (void)
       MetaMonitorsConfig *previous;
 
       meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-      wait_for_orientation_changes (orientation_manager);
+      wait_for_orientation (orientation_manager, i, &times_signalled);
-      g_assert_cmpuint (
+      g_assert_cmpuint (times_signalled, <=, 1);
-        meta_orientation_manager_get_orientation (orientation_manager),
-        ==, i);
 
       META_TEST_LOG_CALL ("Checking configuration per orientation",
                           check_monitor_configuration_per_orientation (
@@ -4435,7 +4420,9 @@ meta_test_monitor_orientation_changes (void)
 
   meta_sensors_proxy_mock_set_orientation (orientation_mock,
                                            META_ORIENTATION_NORMAL);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, META_ORIENTATION_NORMAL,
+                        &times_signalled);
+  g_assert_cmpuint (times_signalled, ==, 0);
   META_TEST_LOG_CALL ("Checking configuration per orientation",
                       check_monitor_configuration_per_orientation (
                         &test_case.expect, 0, META_ORIENTATION_NORMAL,
@@ -4453,10 +4440,8 @@ meta_test_monitor_orientation_changes (void)
       MetaMonitorsConfig *previous;
 
       meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-      wait_for_orientation_changes (orientation_manager);
+      wait_for_orientation (orientation_manager, i, &times_signalled);
-      g_assert_cmpuint (
+      g_assert_cmpuint (times_signalled, <=, 1);
-        meta_orientation_manager_get_orientation (orientation_manager),
-        ==, i);
 
       META_TEST_LOG_CALL ("Checking configuration per orientation",
                           check_monitor_configuration_per_orientation (
@@ -4607,6 +4592,7 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
   g_autoptr (ClutterAutoRemoveInputDevice) touch_device = NULL;
   g_autoptr (MetaSensorsProxyAutoResetMock) orientation_mock = NULL;
   MetaOrientation i;
+  unsigned int times_signalled = 0;
 
   orientation_mock = meta_sensors_proxy_mock_get ();
   touch_device = meta_test_add_touch_device (backend);
@@ -4630,10 +4616,8 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
   for (i = META_N_ORIENTATIONS - 1; i > META_ORIENTATION_UNDEFINED; i--)
     {
       meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-      wait_for_orientation_changes (orientation_manager);
+      wait_for_orientation (orientation_manager, i, &times_signalled);
-      g_assert_cmpuint (
+      g_assert_cmpuint (times_signalled, <=, 1);
-        meta_orientation_manager_get_orientation (orientation_manager),
-        ==, i);
 
       META_TEST_LOG_CALL ("Checking configuration per orientation",
                           check_monitor_configuration_per_orientation (
@@ -4642,7 +4626,9 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
 
   meta_sensors_proxy_mock_set_orientation (orientation_mock,
                                            META_ORIENTATION_NORMAL);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, META_ORIENTATION_NORMAL,
+                        &times_signalled);
+  g_assert_cmpuint (times_signalled, <=, 1);
   check_monitor_configuration (&test_case.expect);
 
   /* External monitor connected */
@@ -4663,10 +4649,8 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
   for (i = META_N_ORIENTATIONS - 1; i > META_ORIENTATION_UNDEFINED; i--)
     {
       meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-      wait_for_orientation_changes (orientation_manager);
+      wait_for_orientation (orientation_manager, i, &times_signalled);
-      g_assert_cmpuint (
+      g_assert_cmpuint (times_signalled, <=, 1);
-        meta_orientation_manager_get_orientation (orientation_manager),
-        ==, i);
 
       META_TEST_LOG_CALL ("Checking configuration per orientation",
                           check_monitor_configuration_per_orientation (
@@ -4675,7 +4659,9 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
 
   meta_sensors_proxy_mock_set_orientation (orientation_mock,
                                            META_ORIENTATION_NORMAL);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, META_ORIENTATION_NORMAL,
+                        &times_signalled);
+  g_assert_cmpuint (times_signalled, <=, 1);
   check_monitor_configuration (&test_case.expect);
 
   /* Lid closed */
@@ -4695,13 +4681,16 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
   for (i = META_N_ORIENTATIONS - 1; i > META_ORIENTATION_UNDEFINED; i--)
     {
       meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-      wait_for_orientation_changes (orientation_manager);
+      wait_for_orientation (orientation_manager, i, &times_signalled);
+      g_assert_cmpuint (times_signalled, <=, 1);
       check_monitor_configuration (&test_case.expect);
     }
 
   meta_sensors_proxy_mock_set_orientation (orientation_mock,
                                            META_ORIENTATION_NORMAL);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, META_ORIENTATION_NORMAL,
+                        &times_signalled);
+  g_assert_cmpuint (times_signalled, <=, 1);
 
   /*
    * The second part of this test emulate the following at each device rotation:
@@ -4744,7 +4733,8 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
 
       /* Change orientation */
       meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-      wait_for_orientation_changes (orientation_manager);
+      wait_for_orientation (orientation_manager, i, &times_signalled);
+      g_assert_cmpuint (times_signalled, <=, 1);
       check_monitor_configuration (&test_case.expect);
 
       /* Open the lid */
@@ -4760,7 +4750,12 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
       meta_backend_test_set_is_lid_closed (META_BACKEND_TEST (backend), FALSE);
       emulate_hotplug (test_setup);
 
-      wait_for_orientation_changes (orientation_manager);
+      /* We don't actually expect the orientation to change here, so we
+       * just wait for a moment (so that if the orientation *did* change,
+       * mutter has had a chance to process it), and then continue. */
+      wait_for_possible_orientation_change (orientation_manager, &times_signalled);
+      g_assert_cmpuint (times_signalled, ==, 0);
+
       META_TEST_LOG_CALL ("Checking configuration per orientation",
                           check_monitor_configuration_per_orientation (
                             &test_case.expect, 0, i, 1024, 768));
@@ -4797,7 +4792,9 @@ meta_test_monitor_orientation_changes_with_hotplugging (void)
 
   meta_sensors_proxy_mock_set_orientation (orientation_mock,
                                            META_ORIENTATION_NORMAL);
-  wait_for_orientation_changes (orientation_manager);
+  wait_for_orientation (orientation_manager, META_ORIENTATION_NORMAL,
+                        &times_signalled);
+  g_assert_cmpuint (times_signalled, <=, 1);
 }
 
 static void

src/tests/orientation-manager-unit-tests.c

@@ -24,42 +24,124 @@
 
 #include "tests/meta-sensors-proxy-mock.h"
 
-static void
+const char *
-on_orientation_changed (gpointer data)
+orientation_to_string (MetaOrientation orientation)
 {
-  gboolean *changed = data;
+  switch (orientation)
+    {
+    case META_ORIENTATION_UNDEFINED:
+      return "(undefined)";
+    case META_ORIENTATION_NORMAL:
+      return "normal";
+    case META_ORIENTATION_BOTTOM_UP:
+      return "bottom-up";
+    case META_ORIENTATION_LEFT_UP:
+      return "left-up";
+    case META_ORIENTATION_RIGHT_UP:
+      return "right-up";
+    default:
+      return "(invalid)";
+    }
+}
 
-  *changed = TRUE;
+typedef struct
+{
+  MetaOrientation expected;
+  MetaOrientation orientation;
+  gulong connection_id;
+  guint timeout_id;
+  unsigned int times_signalled;
+} WaitForOrientation;
+
+static void
+on_orientation_changed (WaitForOrientation     *wfo,
+                        MetaOrientationManager *orientation_manager)
+{
+  wfo->orientation = meta_orientation_manager_get_orientation (orientation_manager);
+  wfo->times_signalled++;
 }
 
 static gboolean
 on_max_wait_timeout (gpointer data)
 {
-  guint *timeout_id = data;
+  WaitForOrientation *wfo = data;
-
-  *timeout_id = 0;
 
+  wfo->timeout_id = 0;
   return G_SOURCE_REMOVE;
 }
 
+/*
+ * Assert that the orientation eventually changes to @orientation.
+ */
 void
-wait_for_orientation_changes (MetaOrientationManager *orientation_manager)
+wait_for_orientation (MetaOrientationManager *orientation_manager,
+                      MetaOrientation         orientation,
+                      unsigned int           *times_signalled_out)
 {
-  gboolean changed = FALSE;
+  WaitForOrientation wfo = {
-  gulong connection_id;
+    .expected = orientation,
-  guint timeout_id;
+  };
 
-  timeout_id = g_timeout_add (300, on_max_wait_timeout, &timeout_id);
+  wfo.orientation = meta_orientation_manager_get_orientation (orientation_manager);
-  connection_id = g_signal_connect_swapped (orientation_manager,
-                                            "orientation-changed",
-                                            G_CALLBACK (on_orientation_changed),
-                                            &changed);
 
-  while (!changed && timeout_id)
+  /* This timeout can be relatively generous because we don't expect to
+   * reach it: if we do, that's a test failure. */
+  wfo.timeout_id = g_timeout_add_seconds (10, on_max_wait_timeout, &wfo);
+  wfo.connection_id = g_signal_connect_swapped (orientation_manager,
+                                                "orientation-changed",
+                                                G_CALLBACK (on_orientation_changed),
+                                                &wfo);
+
+  while (wfo.orientation != orientation && wfo.timeout_id != 0)
     g_main_context_iteration (NULL, TRUE);
 
-  g_clear_handle_id (&timeout_id, g_source_remove);
+  if (wfo.orientation != orientation)
-  g_signal_handler_disconnect (orientation_manager, connection_id);
+    {
+      g_error ("Timed out waiting for orientation to change from %s to %s "
+               "(received %u orientation-changed signal(s) while waiting)",
+               orientation_to_string (wfo.orientation),
+               orientation_to_string (orientation),
+               wfo.times_signalled);
+    }
+
+  g_clear_handle_id (&wfo.timeout_id, g_source_remove);
+  g_signal_handler_disconnect (orientation_manager, wfo.connection_id);
+
+  if (times_signalled_out != NULL)
+    *times_signalled_out = wfo.times_signalled;
+}
+
+/*
+ * Wait for a possible orientation change, but don't assert that one occurs.
+ */
+void
+wait_for_possible_orientation_change (MetaOrientationManager *orientation_manager,
+                                      unsigned int           *times_signalled_out)
+{
+  WaitForOrientation wfo = {
+    .expected = META_ORIENTATION_UNDEFINED,
+  };
+
+  wfo.orientation = meta_orientation_manager_get_orientation (orientation_manager);
+
+  /* This can't be as long as the timeout for wait_for_orientation(),
+   * because in the usual case we expect to reach this timeout: we're
+   * only waiting so that if the orientation (incorrectly?) changed here,
+   * we'd have a chance to detect that. */
+  wfo.timeout_id = g_timeout_add (1000, on_max_wait_timeout, &wfo);
+  wfo.connection_id = g_signal_connect_swapped (orientation_manager,
+                                                "orientation-changed",
+                                                G_CALLBACK (on_orientation_changed),
+                                                &wfo);
+
+  while (wfo.times_signalled == 0 && wfo.timeout_id != 0)
+    g_main_context_iteration (NULL, TRUE);
+
+  g_clear_handle_id (&wfo.timeout_id, g_source_remove);
+  g_signal_handler_disconnect (orientation_manager, wfo.connection_id);
+
+  if (times_signalled_out != NULL)
+    *times_signalled_out = wfo.times_signalled;
 }
 
 static void
@@ -90,25 +172,40 @@ meta_test_orientation_manager_no_device (void)
   g_object_unref (orientation_mock);
 }
 
+static gboolean
+on_wait_for_accel_timeout (gpointer data)
+{
+  guint *timeout_p = data;
+
+  *timeout_p = 0;
+  return G_SOURCE_REMOVE;
+}
+
 static void
 meta_test_orientation_manager_has_accelerometer (void)
 {
   g_autoptr (MetaOrientationManager) manager = NULL;
   g_autoptr (MetaSensorsProxyMock) orientation_mock = NULL;
+  guint timeout_id;
 
   manager = g_object_new (META_TYPE_ORIENTATION_MANAGER, NULL);
   orientation_mock = meta_sensors_proxy_mock_get ();
 
+  timeout_id = g_timeout_add_seconds (10, on_wait_for_accel_timeout, &timeout_id);
   meta_sensors_proxy_mock_set_property (orientation_mock,
                                         "HasAccelerometer",
                                         g_variant_new_boolean (TRUE));
-  wait_for_orientation_changes (manager);
+
+  while (!meta_orientation_manager_has_accelerometer (manager) &&
+         timeout_id != 0)
+    g_main_context_iteration (NULL, TRUE);
 
   g_debug ("Checking whether accelerometer is present");
   g_assert_true (meta_orientation_manager_has_accelerometer (manager));
   g_assert_cmpuint (meta_orientation_manager_get_orientation (manager),
                     ==,
                     META_ORIENTATION_UNDEFINED);
+  g_clear_handle_id (&timeout_id, g_source_remove);
 }
 
 static void
@@ -141,14 +238,13 @@ meta_test_orientation_manager_accelerometer_orientations (void)
 
   for (i = initial + 1; i != initial; i = (i + 1) % META_N_ORIENTATIONS)
     {
-      changed_called = FALSE;
+      unsigned int times_signalled = 0;
-      meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-      wait_for_orientation_changes (manager);
 
+      changed_called = FALSE;
       g_debug ("Checking orientation %d", i);
-      g_assert_cmpuint (meta_orientation_manager_get_orientation (manager),
+      meta_sensors_proxy_mock_set_orientation (orientation_mock, i);
-                        ==,
+      wait_for_orientation (manager, i, &times_signalled);
-                        i);
+      g_assert_cmpuint (times_signalled, <=, 1);
 
       if (i != META_ORIENTATION_UNDEFINED)
         g_assert_true (changed_called);

src/tests/orientation-manager-unit-tests.h

@@ -25,6 +25,12 @@
 
 void init_orientation_manager_tests (void);
 
-void wait_for_orientation_changes (MetaOrientationManager *orientation_manager);
+void wait_for_orientation (MetaOrientationManager *orientation_manager,
+                           MetaOrientation         orientation,
+                           unsigned int           *times_signalled_out);
+void wait_for_possible_orientation_change (MetaOrientationManager *orientation_manager,
+                                           unsigned int           *times_signalled_out);
+
+const char * orientation_to_string (MetaOrientation orientation);
 
 #endif /* ORIENTATION_MANAGER_UNIT_TESTS_H */