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