libcamera/libcamera.git - libcamera official repository

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * File descriptor event notifier
 */

#include <libcamera/base/event_notifier.h>

#include <libcamera/base/event_dispatcher.h>
#include <libcamera/base/log.h>
#include <libcamera/base/message.h>
#include <libcamera/base/thread.h>

#include <libcamera/camera_manager.h>

/**
 * \file event_notifier.h
 * \brief File descriptor event notifier
 */

namespace libcamera {

LOG_DECLARE_CATEGORY(Event)

/**
 * \class EventNotifier
 * \brief Notify of activity on a file descriptor
 *
 * The EventNotifier models a file descriptor event source that can be
 * monitored. It is created with the file descriptor to be monitored and the
 * type of event, and is enabled by default. It will emit the \ref activated
 * signal whenever an event of the monitored type occurs on the file descriptor.
 *
 * Supported type of events are EventNotifier::Read, EventNotifier::Write and
 * EventNotifier::Exception. The type is specified when constructing the
 * notifier, and can be retrieved using the type() function. To listen to
 * multiple event types on the same file descriptor multiple notifiers must be
 * created.
 *
 * The notifier can be disabled with the setEnabled() function. When the notifier
 * is disabled it ignores events and does not emit the \ref activated signal.
 * The notifier can then be re-enabled with the setEnabled() function.


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