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cam: event_loop: Add timer events to event loop

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Extend the EventLoop class to support periodic timer events. This can be
used to run tasks periodically, such as handling the event loop of SDL.

Signed-off-by: Eric Curtin <ecurtin@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Eric Curtin 2022-05-20 20:01:04 +01:00 • committed by Laurent Pinchart
parent 48e991476d
commit a5844adb7b
2 changed files with 30 additions and 1 deletions
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24
src/cam/event_loop.cpp
View file

@ -84,6 +84,30 @@ void EventLoop::addFdEvent(int fd, EventType type,
events_.push_back(std::move(event));
}
void EventLoop::addTimerEvent(const std::chrono::microseconds period,
const std::function<void()> &callback)
{
std::unique_ptr<Event> event = std::make_unique<Event>(callback);
event->event_ = event_new(base_, -1, EV_PERSIST, &EventLoop::Event::dispatch,
event.get());
if (!event->event_) {
std::cerr << "Failed to create timer event" << std::endl;
return;
}
struct timeval tv;
tv.tv_sec = period.count() / 1000000ULL;
tv.tv_usec = period.count() % 1000000ULL;
int ret = event_add(event->event_, &tv);
if (ret < 0) {
std::cerr << "Failed to add timer event" << std::endl;
return;
}
events_.push_back(std::move(event));
}
void EventLoop::dispatchCallback([[maybe_unused]] evutil_socket_t fd,
[[maybe_unused]] short flags, void *param)
{

7
src/cam/event_loop.h
View file

@ -7,9 +7,10 @@
#pragma once
#include <chrono>
#include <functional>
#include <memory>
#include <list>
#include <memory>
#include <mutex>
#include <event2/util.h>
@ -37,6 +38,10 @@ public:
void addFdEvent(int fd, EventType type,
const std::function<void()> &handler);
using duration = std::chrono::steady_clock::duration;
void addTimerEvent(const std::chrono::microseconds period,
const std::function<void()> &handler);
private:
struct Event {
Event(const std::function<void()> &callback);