62 lines
1.5 KiB
C++
62 lines
1.5 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_PIPE_HXX
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#define MPD_EVENT_PIPE_HXX
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#include "check.h"
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/**
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* A pipe that can be used to trigger an event to the read side.
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*
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* Errors in the constructor are fatal.
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*/
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class EventPipe {
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int fds[2];
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public:
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/**
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* Throws on error.
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*/
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EventPipe();
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~EventPipe() noexcept;
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EventPipe(const EventPipe &other) = delete;
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EventPipe &operator=(const EventPipe &other) = delete;
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int Get() const noexcept {
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return fds[0];
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}
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/**
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* Checks if Write() was called at least once since the last
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* Read() call.
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*/
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bool Read() noexcept;
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/**
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* Wakes up the reader. Multiple calls to this function will
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* be combined to one wakeup.
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*/
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void Write() noexcept;
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};
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#endif /* MAIN_NOTIFY_H */
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