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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * message.cpp - Message queue support
 */

#include "message.h"

#include <libcamera/signal.h>

#include "log.h"

/**
 * \file message.h
 * \brief Message queue support
 *
 * The messaging API enables inter-thread communication through message
 * posting. Messages can be sent from any thread to any recipient deriving from
 * the Object class.
 *
 * To post a message, the sender allocates it dynamically as instance of a class
 * derived from Message. It then posts the message to an Object recipient
 * through Object::postMessage(). Message ownership is passed to the object,
 * thus the message shall not store any temporary data.
 *
 * The message is delivered in the context of the object's thread, through the
 * Object::message() virtual method. After delivery the message is
 * automatically deleted.
 */

namespace libcamera {

LOG_DEFINE_CATEGORY(Message)

std::atomic_uint Message::nextUserType_{ Message::UserMessage };

/**
 * \class Message
 * \brief A message that can be posted to a Thread
 */

/**
 * \enum Message::Type
 * \brief The message type
 * \var Message::None
 * \brief Invalid message type
 * \var Message::InvokeMessage
 * \brief Asynchronous method invocation across threads
 * \var Message::ThreadMoveMessage
 * \brief Object is being moved to a different thread
 * \var Message::UserMessage
 * \brief First value available for user-defined messages
 */

/**
 * \brief Construct a message object of type \a type
 * \param[in] type The message type
 */
Message::Message(Message::Type type)
	: type_(type)
{
}

Message::~Message()
{
}

/**
 * \fn Message::type()
 * \brief Retrieve the message type
 * \return The message type
 */

/**
 * \fn Message::receiver()
 * \brief Retrieve the message receiver