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/* 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();
base_ = event_base_new();
instance_ = this;
}
EventLoop::~EventLoop()
{
instance_ = nullptr;
event_base_free(base_);
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(base_, 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(base_);
}
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();
}
}
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