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-rw-r--r--src/apps/cam/event_loop.h68
1 files changed, 68 insertions, 0 deletions
diff --git a/src/apps/cam/event_loop.h b/src/apps/cam/event_loop.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * event_loop.h - cam - Event loop
+ */
+
+#pragma once
+
+#include <chrono>
+#include <functional>
+#include <list>
+#include <memory>
+#include <mutex>
+
+#include <event2/util.h>
+
+struct event_base;
+
+class EventLoop
+{
+public:
+ enum EventType {
+ Read = 1,
+ Write = 2,
+ };
+
+ EventLoop();
+ ~EventLoop();
+
+ static EventLoop *instance();
+
+ int exec();
+ void exit(int code = 0);
+
+ void callLater(const std::function<void()> &func);
+
+ 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);
+ ~Event();
+
+ static void dispatch(int fd, short events, void *arg);
+
+ std::function<void()> callback_;
+ struct event *event_;
+ };
+
+ static EventLoop *instance_;
+
+ struct event_base *base_;
+ int exitCode_;
+
+ std::list<std::function<void()>> calls_;
+ std::list<std::unique_ptr<Event>> events_;
+ std::mutex lock_;
+
+ static void dispatchCallback(evutil_socket_t fd, short flags,
+ void *param);
+ void dispatchCall();
+};