libcamera v0.6.0 Supporting cameras in Linux since 2019

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event_dispatcher_poll.h
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * Copyright (C) 2019, Google Inc.
4 *
5 * Poll-based event dispatcher
6 */
7
8#pragma once
9
10#include <list>
11#include <map>
12#include <vector>
13
14#include <libcamera/base/private.h>
15
16#include <libcamera/base/event_dispatcher.h>
17#include <libcamera/base/unique_fd.h>
18
19 struct pollfd;
20
21 namespace libcamera {
22
23 class EventNotifier;
24 class Timer;
25
26 class EventDispatcherPoll final : public EventDispatcher
27{
28 public:
29 EventDispatcherPoll();
30 ~EventDispatcherPoll();
31
32 void registerEventNotifier(EventNotifier *notifier);
33 void unregisterEventNotifier(EventNotifier *notifier);
34
35 void registerTimer(Timer *timer);
36 void unregisterTimer(Timer *timer);
37
38 void processEvents();
39 void interrupt();
40
41 private:
42 struct EventNotifierSetPoll {
43 short events() const;
44 EventNotifier *notifiers[3];
45 };
46
47 int poll(std::vector<struct pollfd> *pollfds);
48 void processInterrupt(const struct pollfd &pfd);
49 void processNotifiers(const std::vector<struct pollfd> &pollfds);
50 void processTimers();
51
52 std::map<int, EventNotifierSetPoll> notifiers_;
53 std::list<Timer *> timers_;
54 UniqueFD eventfd_;
55
56 bool processingEvents_;
57};
58
59} /* namespace libcamera */
libcamera::EventDispatcherPoll::registerTimer
void registerTimer(Timer *timer)
Register a timer.
Definition event_dispatcher_poll.cpp:113
libcamera::EventDispatcherPoll::unregisterEventNotifier
void unregisterEventNotifier(EventNotifier *notifier)
Unregister an event notifier.
Definition event_dispatcher_poll.cpp:80
libcamera::EventDispatcherPoll::unregisterTimer
void unregisterTimer(Timer *timer)
Unregister a timer.
Definition event_dispatcher_poll.cpp:125
libcamera::EventDispatcherPoll::interrupt
void interrupt()
Interrupt any running processEvents() call as soon as possible.
Definition event_dispatcher_poll.cpp:174
libcamera::EventDispatcherPoll::registerEventNotifier
void registerEventNotifier(EventNotifier *notifier)
Register an event notifier.
Definition event_dispatcher_poll.cpp:65
libcamera::EventDispatcherPoll::processEvents
void processEvents()
Wait for and process pending events.
Definition event_dispatcher_poll.cpp:142
libcamera::EventDispatcher
Interface to manage the libcamera events and timers.
Definition event_dispatcher.h:18
libcamera::EventNotifier
Notify of activity on a file descriptor.
Definition event_notifier.h:20
libcamera::Timer
Single-shot timer interface.
Definition timer.h:22
libcamera::UniqueFD
unique_ptr-like wrapper for a file descriptor
Definition unique_fd.h:17
event_dispatcher.h
libcamera
Top-level libcamera namespace.
Definition backtrace.h:17
unique_fd.h
File descriptor wrapper that owns a file descriptor.