1 files changed, 71 insertions, 0 deletions
diff --git a/include/libcamera/base/message.h b/include/libcamera/base/message.h
new file mode 100644
index 00000000..5d2a9f04
--- /dev/null
+++ b/include/libcamera/base/message.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * message.h - Message queue support
+ */
+#ifndef __LIBCAMERA_BASE_MESSAGE_H__
+#define __LIBCAMERA_BASE_MESSAGE_H__
+
+#include <atomic>
+
+#include <libcamera/base/bound_method.h>
+
+namespace libcamera {
+
+class BoundMethodBase;
+class Object;
+class Semaphore;
+class Thread;
+
+class Message
+{
+public:
+	enum Type {
+		None = 0,
+		InvokeMessage = 1,
+		ThreadMoveMessage = 2,
+		DeferredDelete = 3,
+		UserMessage = 1000,
+	};
+
+	Message(Type type);
+	virtual ~Message();
+
+	Type type() const { return type_; }
+	Object *receiver() const { return receiver_; }
+
+	static Type registerMessageType();
+
+private:
+	friend class Thread;
+
+	Type type_;
+	Object *receiver_;
+
+	static std::atomic_uint nextUserType_;
+};
+
+class InvokeMessage : public Message
+{
+public:
+	InvokeMessage(BoundMethodBase *method,
+		      std::shared_ptr<BoundMethodPackBase> pack,
+		      Semaphore *semaphore = nullptr,
+		      bool deleteMethod = false);
+	~InvokeMessage();
+
+	Semaphore *semaphore() const { return semaphore_; }
+
+	void invoke();
+
+private:
+	BoundMethodBase *method_;
+	std::shared_ptr<BoundMethodPackBase> pack_;
+	Semaphore *semaphore_;
+	bool deleteMethod_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_BASE_MESSAGE_H__ */