08b2e03a8a
If a timer is running while it's deleted it is still register with the event dispatcher. This causes a segmentation fault when the timer time-out and its signal is emitted. Fix this my stopping the timer when it's deleted. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
116 lines
2.2 KiB
C++
116 lines
2.2 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* timer.cpp - Generic timer
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*/
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#include <libcamera/timer.h>
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#include <time.h>
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#include <libcamera/camera_manager.h>
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#include <libcamera/event_dispatcher.h>
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#include "log.h"
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/**
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* \file timer.h
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* \brief Generic timer
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*/
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namespace libcamera {
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LOG_DEFINE_CATEGORY(Timer)
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/**
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* \class Timer
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* \brief Single-shot timer interface
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*
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* The Timer class models a single-shot timer that is started with start() and
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* emits the \ref timeout signal when it times out.
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*
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* Once started the timer will run until it times out. It can be stopped with
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* stop(), and once it times out or is stopped, can be started again with
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* start().
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*/
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/**
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* \brief Construct a timer
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*/
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Timer::Timer()
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: interval_(0), deadline_(0)
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{
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}
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Timer::~Timer()
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{
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stop();
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}
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/**
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* \brief Start or restart the timer with a timeout of \a msec
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* \param[in] msec The timer duration in milliseconds
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*
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* If the timer is already running it will be stopped and restarted.
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*/
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void Timer::start(unsigned int msec)
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{
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struct timespec tp;
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clock_gettime(CLOCK_MONOTONIC, &tp);
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interval_ = msec;
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deadline_ = tp.tv_sec * 1000000000ULL + tp.tv_nsec + msec * 1000000ULL;
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LOG(Timer, Debug)
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<< "Starting timer " << this << " with interval "
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<< msec << ": deadline " << deadline_;
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CameraManager::instance()->eventDispatcher()->registerTimer(this);
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}
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/**
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* \brief Stop the timer
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*
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* After this function returns the timer is guaranteed not to emit the
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* \ref timeout signal.
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*
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* If the timer is not running this function performs no operation.
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*/
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void Timer::stop()
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{
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CameraManager::instance()->eventDispatcher()->unregisterTimer(this);
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deadline_ = 0;
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}
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/**
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* \brief Check if the timer is running
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* \return True if the timer is running, false otherwise
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*/
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bool Timer::isRunning() const
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{
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return deadline_ != 0;
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}
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/**
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* \fn Timer::interval()
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* \brief Retrieve the timer interval
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* \return The timer interval in milliseconds
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*/
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/**
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* \fn Timer::deadline()
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* \brief Retrieve the timer deadline
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* \return The timer deadline in nanoseconds
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*/
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/**
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* \var Timer::timeout
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* \brief Signal emitted when the timer times out
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*
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* The timer pointer is passed as a parameter.
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*/
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} /* namespace libcamera */
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