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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* timer.cpp - Generic timer
*/
#include <time.h>
#include <libcamera/camera_manager.h>
#include <libcamera/event_dispatcher.h>
#include <libcamera/timer.h>
#include "log.h"
/**
* \file timer.h
* \brief Generic timer
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(Timer)
/**
* \class Timer
* \brief Single-shot timer interface
*
* The Timer class models a single-shot timer that is started with start() and
* emits the \ref timeout signal when it times out.
*
* Once started the timer will run until it times out. It can be stopped with
* stop(), and once it times out or is stopped, can be started again with
* start().
*/
/**
* \brief Construct a timer
*/
Timer::Timer()
: interval_(0), deadline_(0)
{
}
/**
* \brief Start or restart the timer with a timeout of \a msec
* \param msec The timer duration in milliseconds
*
* If the timer is already running it will be stopped and restarted.
*/
void Timer::start(unsigned int msec)
{
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
interval_ = msec;
deadline_ = tp.tv_sec * 1000000000ULL + tp.tv_nsec + msec * 1000000ULL;
LOG(Timer, Debug)
<< "Starting timer " << this << " with interval "
<< msec << ": deadline " << deadline_;
CameraManager::instance()->eventDispatcher()->registerTimer(this);
}
/**
* \brief Stop the timer
*
* After this function returns the timer is guaranteed not to emit the
* \ref timeout signal.
*
* If the timer is not running this function performs no operation.
*/
void Timer::stop()
{
CameraManager::instance()->eventDispatcher()->unregisterTimer(this);
deadline_ = 0;
}
/**
* \brief Check if the timer is running
* \return True if the timer is running, false otherwise
*/
bool Timer::isRunning() const
{
return deadline_ != 0;
}
/**
* \fn Timer::interval()
* \brief Retrieve the timer interval
* \return The timer interval in milliseconds
*/
/**
* \fn Timer::deadline()
* \brief Retrieve the timer deadline
* \return The timer deadline in nanoseconds
*/
/**
* \var Timer::timeout
* \brief Signal emitted when the timer times out
*
* The timer pointer is passed as a parameter.
*/
} /* namespace libcamera */
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