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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_EVENT_POLLGROUP_EPOLL_HXX
#define MPD_EVENT_POLLGROUP_EPOLL_HXX
#include "check.h"
#include "util/Compiler.h"
#include "system/EpollFD.hxx"
#include <array>
#include <algorithm>
class PollResultEpoll
{
friend class PollGroupEpoll;
std::array<epoll_event, 16> events;
size_t n_events = 0;
public:
size_t GetSize() const noexcept {
return n_events;
}
unsigned GetEvents(size_t i) const noexcept {
return events[i].events;
}
void *GetObject(size_t i) const noexcept {
return events[i].data.ptr;
}
void Reset() noexcept {
n_events = 0;
}
void Clear(void *obj) noexcept {
for (size_t i = 0; i < n_events; ++i)
if (events[i].data.ptr == obj)
events[i].events = 0;
}
};
class PollGroupEpoll
{
EpollFD epoll;
PollGroupEpoll(PollGroupEpoll &) = delete;
PollGroupEpoll &operator=(PollGroupEpoll &) = delete;
public:
static constexpr unsigned READ = EPOLLIN;
static constexpr unsigned WRITE = EPOLLOUT;
static constexpr unsigned ERROR = EPOLLERR;
static constexpr unsigned HANGUP = EPOLLHUP;
PollGroupEpoll() = default;
void ReadEvents(PollResultEpoll &result, int timeout_ms) noexcept {
int ret = epoll.Wait(result.events.data(), result.events.size(),
timeout_ms);
result.n_events = std::max(0, ret);
}
bool Add(int fd, unsigned events, void *obj) noexcept {
return epoll.Add(fd, events, obj);
}
bool Modify(int fd, unsigned events, void *obj) noexcept {
return epoll.Modify(fd, events, obj);
}
bool Remove(int fd) noexcept {
return epoll.Remove(fd);
}
bool Abandon(gcc_unused int fd) noexcept {
// Nothing to do in this implementation.
// Closed descriptors are automatically unregistered.
return true;
}
};
#endif
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