libcamera/base: Move extended base functionality

Move the functionality for the following components to the new
base support library:

 - BoundMethod
 - EventDispatcher
 - EventDispatcherPoll
 - Log
 - Message
 - Object
 - Signal
 - Semaphore
 - Thread
 - Timer

While it would be preferable to see these split to move one component
per commit, these components are all interdependent upon each other,
which leaves us with one big change performing the move for all of them.

Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/include/libcamera/base/event_dispatcher_poll.h b/include/libcamera/base/event_dispatcher_poll.h
new file mode 100644
index 00000000..ae2a3f04
--- /dev/null
+++ b/include/libcamera/base/event_dispatcher_poll.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * event_dispatcher_poll.h - Poll-based event dispatcher
+ */
+#ifndef __LIBCAMERA_BASE_EVENT_DISPATCHER_POLL_H__
+#define __LIBCAMERA_BASE_EVENT_DISPATCHER_POLL_H__
+
+#include <list>
+#include <map>
+#include <vector>
+
+#include <libcamera/base/event_dispatcher.h>
+
+struct pollfd;
+
+namespace libcamera {
+
+class EventNotifier;
+class Timer;
+
+class EventDispatcherPoll final : public EventDispatcher
+{
+public:
+	EventDispatcherPoll();
+	~EventDispatcherPoll();
+
+	void registerEventNotifier(EventNotifier *notifier);
+	void unregisterEventNotifier(EventNotifier *notifier);
+
+	void registerTimer(Timer *timer);
+	void unregisterTimer(Timer *timer);
+
+	void processEvents();
+	void interrupt();
+
+private:
+	struct EventNotifierSetPoll {
+		short events() const;
+		EventNotifier *notifiers[3];
+	};
+
+	int poll(std::vector<struct pollfd> *pollfds);
+	void processInterrupt(const struct pollfd &pfd);
+	void processNotifiers(const std::vector<struct pollfd> &pollfds);
+	void processTimers();
+
+	std::map<int, EventNotifierSetPoll> notifiers_;
+	std::list<Timer *> timers_;
+	int eventfd_;
+
+	bool processingEvents_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_BASE_EVENT_DISPATCHER_POLL_H__ */