ce49d99c2f
Since we switched from autotools to Meson in commit
94592c1406, we don't need to include
`config.h` early to properly enable large file support. Meson passes
the required macros on the compiler command line instead of defining
them in `config.h`.
This means we can include `config.h` at any time, whenever we want to
check its macros, and there are no ordering constraints.
100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
/*
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* Copyright 2003-2018 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 "util/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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size_t n_events = 0;
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public:
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size_t GetSize() const noexcept {
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return n_events;
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}
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unsigned GetEvents(size_t i) const noexcept {
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return events[i].events;
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}
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void *GetObject(size_t i) const noexcept {
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return events[i].data.ptr;
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}
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void Reset() noexcept {
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n_events = 0;
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}
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void Clear(void *obj) noexcept {
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for (size_t 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) noexcept {
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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) noexcept {
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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) noexcept {
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return epoll.Modify(fd, events, obj);
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}
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bool Remove(int fd) noexcept {
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return epoll.Remove(fd);
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}
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bool Abandon(gcc_unused int fd) noexcept {
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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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