test: Add Object::invokeMethod() test

The test verifies correct behaviour of asynchronous method invocation
for Object instances.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

test/meson.build

@@ -24,6 +24,7 @@ public_tests = [
 internal_tests = [
     ['camera-sensor',                   'camera-sensor.cpp'],
     ['message',                         'message.cpp'],
+    ['object-invoke',                   'object-invoke.cpp'],
     ['signal-threads',                  'signal-threads.cpp'],
     ['threads',                         'threads.cpp'],
 ]

test/object-invoke.cpp

@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * object-invoke.cpp - Cross-thread Object method invocation test
+ */
+
+#include <chrono>
+#include <iostream>
+#include <thread>
+
+#include <libcamera/camera_manager.h>
+#include <libcamera/event_dispatcher.h>
+#include <libcamera/object.h>
+
+#include "thread.h"
+#include "test.h"
+
+using namespace std;
+using namespace libcamera;
+
+class InvokedObject : public Object
+{
+public:
+	enum Status {
+		NoCall,
+		InvalidThread,
+		CallReceived,
+	};
+
+	InvokedObject()
+		: status_(NoCall)
+	{
+	}
+
+	Status status() const { return status_; }
+	int value() const { return value_; }
+	void reset()
+	{
+		status_ = NoCall;
+		value_ = 0;
+	}
+
+	void method(int value)
+	{
+		if (Thread::current() != thread())
+			status_ = InvalidThread;
+		else
+			status_ = CallReceived;
+
+		value_ = value;
+	}
+
+private:
+	Status status_;
+	int value_;
+};
+
+class ObjectInvokeTest : public Test
+{
+protected:
+	int run()
+	{
+		EventDispatcher *dispatcher = CameraManager::instance()->eventDispatcher();
+		InvokedObject object;
+
+		/*
+		 * Test that method invocation in the same thread goes through
+		 * the event dispatcher.
+		 */
+		object.invokeMethod(&InvokedObject::method, 42);
+
+		if (object.status() != InvokedObject::NoCall) {
+			cerr << "Method not invoked asynchronously" << endl;
+			return TestFail;
+		}
+
+		dispatcher->processEvents();
+
+		switch (object.status()) {
+		case InvokedObject::NoCall:
+			cout << "Method not invoked for main thread" << endl;
+			return TestFail;
+		case InvokedObject::InvalidThread:
+			cout << "Method invoked in incorrect thread for main thread" << endl;
+			return TestFail;
+		default:
+			break;
+		}
+
+		if (object.value() != 42) {
+			cout << "Method invoked with incorrect value for main thread" << endl;
+			return TestFail;
+		}
+
+		/*
+		 * Move the object to a thread and verify that the method is
+		 * delivered in the correct thread.
+		 */
+		object.reset();
+		object.moveToThread(&thread_);
+
+		thread_.start();
+
+		object.invokeMethod(&InvokedObject::method, 42);
+		this_thread::sleep_for(chrono::milliseconds(100));
+
+		switch (object.status()) {
+		case InvokedObject::NoCall:
+			cout << "Method not invoked for custom thread" << endl;
+			return TestFail;
+		case InvokedObject::InvalidThread:
+			cout << "Method invoked in incorrect thread for custom thread" << endl;
+			return TestFail;
+		default:
+			break;
+		}
+
+		if (object.value() != 42) {
+			cout << "Method invoked with incorrect value for custom thread" << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+
+	void cleanup()
+	{
+		thread_.exit(0);
+		thread_.wait();
+	}
+
+private:
+	Thread thread_;
+};
+
+TEST_REGISTER(ObjectInvokeTest)