133 lines
3.1 KiB
C++
133 lines
3.1 KiB
C++
/*
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* Copyright 2003-2021 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 EVENT_WINSELECT_BACKEND_HXX
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#define EVENT_WINSELECT_BACKEND_HXX
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#include "PollResultGeneric.hxx"
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#include <algorithm>
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#include <cassert>
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#include <unordered_map>
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#include <winsock2.h>
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class SocketSet
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{
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fd_set set;
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public:
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SocketSet() noexcept {
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set.fd_count = 0;
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}
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SocketSet(const SocketSet &other) noexcept {
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set.fd_count = other.set.fd_count;
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std::copy_n(other.set.fd_array, set.fd_count, set.fd_array);
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}
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fd_set *GetPtr() noexcept {
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return IsEmpty() ? nullptr : &set;
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}
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size_t Size() const noexcept {
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return set.fd_count;
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}
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bool IsEmpty() const noexcept {
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return set.fd_count == 0;
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}
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bool IsFull() const noexcept {
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return set.fd_count == FD_SETSIZE;
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}
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SOCKET operator[](size_t index) const noexcept {
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assert(index < set.fd_count);
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return set.fd_array[index];
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}
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size_t Add(SOCKET fd) noexcept {
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assert(!IsFull());
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set.fd_array[set.fd_count] = fd;
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return set.fd_count++;
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}
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void MoveToEnd(size_t index) noexcept {
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assert(index < set.fd_count);
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std::swap(set.fd_array[index], set.fd_array[set.fd_count - 1]);
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}
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void RemoveLast() noexcept {
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assert(!IsEmpty());
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--set.fd_count;
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}
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const auto *begin() const noexcept {
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return set.fd_array;
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}
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const auto *end() const noexcept {
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return set.fd_array + set.fd_count;
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}
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};
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class WinSelectBackend
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{
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struct Item
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{
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int index[2]{-1, -1};
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void *obj;
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unsigned events = 0;
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explicit constexpr Item(void *_obj) noexcept
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:obj(_obj) {}
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Item(const Item &) = delete;
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Item &operator=(const Item &) = delete;
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};
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SocketSet event_set[2];
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std::unordered_map<SOCKET, Item> items;
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public:
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WinSelectBackend() noexcept;
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~WinSelectBackend() noexcept;
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WinSelectBackend(const WinSelectBackend &) = delete;
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WinSelectBackend &operator=(const WinSelectBackend &) = delete;
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PollResultGeneric ReadEvents(int timeout_ms) noexcept;
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bool Add(SOCKET fd, unsigned events, void *obj) noexcept;
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bool Modify(SOCKET fd, unsigned events, void *obj) noexcept;
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bool Remove(SOCKET fd) noexcept;
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bool Abandon(SOCKET fd) noexcept {
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return Remove(fd);
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}
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private:
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bool CanModify(Item &item, unsigned events,
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int event_id) const noexcept;
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void Modify(Item &item, SOCKET fd, unsigned events,
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int event_id) noexcept;
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void ApplyReady(const SocketSet &src, unsigned events) noexcept;
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};
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#endif
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