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, 76 insertions, 0 deletions

diff --git a/include/libcamera/base/thread.h b/include/libcamera/base/thread.h
new file mode 100644
index 00000000..2ed18d49
--- /dev/null
+++ b/include/libcamera/base/thread.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * thread.h - Thread support
+ */
+#ifndef __LIBCAMERA_BASE_THREAD_H__
+#define __LIBCAMERA_BASE_THREAD_H__
+
+#include <memory>
+#include <mutex>
+#include <sys/types.h>
+#include <thread>
+
+#include <libcamera/base/message.h>
+#include <libcamera/base/signal.h>
+#include <libcamera/base/utils.h>
+
+namespace libcamera {
+
+class EventDispatcher;
+class Message;
+class Object;
+class ThreadData;
+class ThreadMain;
+
+using Mutex = std::mutex;
+using MutexLocker = std::unique_lock<std::mutex>;
+
+class Thread
+{
+public:
+	Thread();
+	virtual ~Thread();
+
+	void start();
+	void exit(int code = 0);
+	bool wait(utils::duration duration = utils::duration::max());
+
+	bool isRunning();
+
+	Signal<Thread *> finished;
+
+	static Thread *current();
+	static pid_t currentId();
+
+	EventDispatcher *eventDispatcher();
+
+	void dispatchMessages(Message::Type type = Message::Type::None);
+
+protected:
+	int exec();
+	virtual void run();
+
+private:
+	void startThread();
+	void finishThread();
+
+	void postMessage(std::unique_ptr<Message> msg, Object *receiver);
+	void removeMessages(Object *receiver);
+
+	friend class Object;
+	friend class ThreadData;
+	friend class ThreadMain;
+
+	void moveObject(Object *object);
+	void moveObject(Object *object, ThreadData *currentData,
+			ThreadData *targetData);
+
+	std::thread thread_;
+	ThreadData *data_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_BASE_THREAD_H__ */