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/**
* Copyright (c) 2018 Cornell University.
*
* Author: Ted Yin <tederminant@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _SALTICIDAE_EVENT_H
#define _SALTICIDAE_EVENT_H
#include <unistd.h>
#include <event2/event.h>
#include <sys/eventfd.h>
#ifdef SALTICIDAE_DEBUG_LOG
#include <thread>
#endif
#include "salticidae/queue.h"
#include "salticidae/util.h"
#include "salticidae/ref.h"
namespace salticidae {
struct _event_context_deleter {
constexpr _event_context_deleter() = default;
void operator()(struct event_base *ptr) {
if (ptr != nullptr) event_base_free(ptr);
}
};
using _event_context_ot = RcObj<struct event_base, _event_context_deleter>;
class EventContext: public _event_context_ot {
public:
EventContext(): _event_context_ot(event_base_new()) {}
EventContext(struct event_base *eb): _event_context_ot(eb) {}
EventContext(const EventContext &) = default;
EventContext(EventContext &&) = default;
EventContext &operator=(const EventContext &) = default;
EventContext &operator=(EventContext &&) = default;
void dispatch() { event_base_dispatch(get()); }
void stop() { event_base_loopbreak(get()); }
};
class Event {
public:
using callback_t = std::function<void(evutil_socket_t fd, short events)>;
private:
EventContext eb;
evutil_socket_t fd;
short events;
struct event *ev;
callback_t callback;
static inline void _then(evutil_socket_t fd, short events, void *arg) {
(static_cast<Event *>(arg))->callback(fd, events);
}
public:
Event(): eb(nullptr), ev(nullptr) {}
Event(const EventContext &eb,
evutil_socket_t fd,
short events,
callback_t callback):
eb(eb), fd(fd), events(events),
ev(event_new(eb.get(), fd, events, Event::_then, this)),
callback(callback) {}
Event(const Event &) = delete;
Event(Event &&other):
eb(std::move(other.eb)), fd(other.fd), events(other.events),
callback(std::move(other.callback)) {
other.clear();
ev = event_new(eb.get(), fd, events, Event::_then, this);
}
Event &operator=(Event &&other) {
clear();
other.clear();
eb = std::move(other.eb);
fd = other.fd;
events = other.events;
ev = event_new(eb.get(), fd, events, Event::_then, this);
callback = std::move(other.callback);
return *this;
}
~Event() { clear(); }
void clear() {
if (ev != nullptr)
{
event_del(ev);
event_free(ev);
ev = nullptr;
}
}
void add() { if (ev) event_add(ev, nullptr); }
void del() { if (ev) event_del(ev); }
void add_with_timeout(double timeout) {
if (ev)
event_add_with_timeout(ev, timeout);
}
operator bool() const { return ev != nullptr; }
};
template<typename T>
class MPSCQueueEventDriven: public MPMCQueue<T> {
private:
std::atomic<bool> wait_sig;
int fd;
Event ev;
public:
template<typename Func>
MPSCQueueEventDriven(const EventContext &ec, Func &&func, size_t capacity = 65536):
MPMCQueue<T>(capacity),
wait_sig(true),
fd(eventfd(0, EFD_NONBLOCK)),
ev(Event(ec, fd, EV_READ | EV_PERSIST,
[this, func=std::forward<Func>(func)](int, short) {
uint64_t t;
read(fd, &t, 8);
SALTICIDAE_LOG_DEBUG("%x\n", std::this_thread::get_id());
T elem;
while (MPMCQueue<T>::try_dequeue(elem))
func(std::move(elem));
wait_sig.store(true, std::memory_order_relaxed);
})) { ev.add(); }
~MPSCQueueEventDriven() { close(fd); }
template<typename U>
bool enqueue(U &&e) {
static const uint64_t dummy = 1;
bool ret = MPMCQueue<T>::enqueue(std::forward<U>(e));
if (wait_sig.exchange(false, std::memory_order_relaxed))
{
SALTICIDAE_LOG_DEBUG("mpsc notify");
write(fd, &dummy, 8);
}
return ret;
}
};
template<typename T>
class MPMCQueueEventDriven: public MPMCQueue<T> {
private:
std::atomic<bool> wait_sig;
std::vector<std::pair<BoxObj<Event>, int>> evs;
public:
MPMCQueueEventDriven(size_t capacity = 65536):
MPMCQueue<T>(capacity),
wait_sig(true) {}
template<typename Func>
void listen(const EventContext &ec, Func &&func) {
int fd = eventfd(0, EFD_NONBLOCK);
evs.emplace(evs.end(), std::make_pair(new Event(ec, fd, EV_READ | EV_PERSIST,
[this, func=std::forward<Func>(func)](int fd, short) {
uint64_t t;
read(fd, &t, 8);
SALTICIDAE_LOG_DEBUG("%x\n", std::this_thread::get_id());
T elem;
while (MPMCQueue<T>::try_dequeue(elem))
func(std::move(elem));
wait_sig.store(true, std::memory_order_relaxed);
}), fd));
evs.rbegin()->first->add();
}
~MPMCQueueEventDriven() {
for (const auto &p: evs)
close(p.second);
}
template<typename U>
bool enqueue(U &&e) {
static const uint64_t dummy = 1;
bool ret = MPMCQueue<T>::enqueue(std::forward<U>(e));
if (wait_sig.exchange(false, std::memory_order_relaxed))
{
SALTICIDAE_LOG_DEBUG("mpmc notify");
for (const auto &p: evs)
write(p.second, &dummy, 8);
}
return ret;
}
};
}
#endif
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