/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2019, Google Inc. * * event_loop.cpp - cam - Event loop */ #include "event_loop.h" #include <assert.h> #include <event2/event.h> #include <event2/thread.h> EventLoop *EventLoop::instance_ = nullptr; EventLoop::EventLoop() { assert(!instance_); evthread_use_pthreads(); event_ = event_base_new(); instance_ = this; } EventLoop::~EventLoop() { instance_ = nullptr; event_base_free(event_); libevent_global_shutdown(); } EventLoop *EventLoop::instance() { return instance_; } int EventLoop::exec() { exitCode_ = -1; exit_.store(false, std::memory_order_release); while (!exit_.load(std::memory_order_acquire)) { dispatchCalls(); event_base_loop(event_, EVLOOP_NO_EXIT_ON_EMPTY); } return exitCode_; } void EventLoop::exit(int code) { exitCode_ = code; exit_.store(true, std::memory_order_release); interrupt(); } void EventLoop::interrupt() { event_base_loopbreak(event_); } void EventLoop::callLater(const std::function<void()> &func) { { std::unique_lock<std::mutex> locker(lock_); calls_.push_back(func); } interrupt(); } void EventLoop::dispatchCalls() { std::unique_lock<std::mutex> locker(lock_); for (auto iter = calls_.begin(); iter != calls_.end(); ) { std::function<void()> call = std::move(*iter); iter = calls_.erase(iter); locker.unlock(); call(); locker.lock(); } }