test: Add EventNotifier thread move test

The test verifies correct behaviour of an enabled event notifier moved
to a different thread.

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/event-thread.cpp

@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * event-thread.cpp - Threaded event test
+ */
+
+#include <chrono>
+#include <iostream>
+#include <string.h>
+#include <unistd.h>
+
+#include <libcamera/event_notifier.h>
+#include <libcamera/timer.h>
+
+#include "test.h"
+#include "thread.h"
+
+using namespace std;
+using namespace libcamera;
+
+class EventHandler : public Object
+{
+public:
+	EventHandler()
+		: notified_(false)
+	{
+		pipe(pipefd_);
+
+		notifier_ = new EventNotifier(pipefd_[0], EventNotifier::Read);
+		notifier_->activated.connect(this, &EventHandler::readReady);
+	}
+
+	~EventHandler()
+	{
+		delete notifier_;
+
+		close(pipefd_[0]);
+		close(pipefd_[1]);
+	}
+
+	int notify()
+	{
+		std::string data("H2G2");
+		ssize_t ret;
+
+		memset(data_, 0, sizeof(data_));
+		size_ = 0;
+
+		ret = write(pipefd_[1], data.data(), data.size());
+		if (ret < 0) {
+			cout << "Pipe write failed" << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+
+	bool notified() const
+	{
+		return notified_;
+	}
+
+	void moveToThread(Thread *thread)
+	{
+		Object::moveToThread(thread);
+		notifier_->moveToThread(thread);
+	}
+
+private:
+	void readReady(EventNotifier *notifier)
+	{
+		size_ = read(notifier->fd(), data_, sizeof(data_));
+		notified_ = true;
+	}
+
+	EventNotifier *notifier_;
+
+	int pipefd_[2];
+
+	bool notified_;
+	char data_[16];
+	ssize_t size_;
+};
+
+class EventThreadTest : public Test
+{
+protected:
+	int run()
+	{
+		Thread thread;
+		thread.start();
+
+		/*
+		 * Fire the event notifier and then move the notifier to a
+		 * different thread. The notifier will not notice the event
+		 * immediately as there is no event dispatcher loop running in
+		 * the main thread. This tests that a notifier being moved to a
+		 * different thread will correctly process already pending
+		 * events in the new thread.
+		 */
+		EventHandler handler;
+		handler.notify();
+		handler.moveToThread(&thread);
+
+		this_thread::sleep_for(chrono::milliseconds(100));
+
+		/* Must stop thread before destroying the handler. */
+		thread.exit(0);
+		thread.wait();
+
+		if (!handler.notified()) {
+			cout << "Thread event handling test failed" << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(EventThreadTest)

test/meson.build

@@ -23,6 +23,7 @@ public_tests = [
 
 internal_tests = [
     ['camera-sensor',                   'camera-sensor.cpp'],
+    ['event-thread',                    'event-thread.cpp'],
     ['message',                         'message.cpp'],
     ['object',                          'object.cpp'],
     ['object-invoke',                   'object-invoke.cpp'],