mirror of
https://github.com/Llewellynvdm/conky.git
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75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
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/* -*- mode: c++; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
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* vim: ts=4 sw=4 noet ai cindent syntax=cpp
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*
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* Conky, a system monitor, based on torsmo
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*
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* Please see COPYING for details
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*
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* Copyright (C) 2010 Pavel Labath et al.
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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 3 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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef SEMAPHORE_HH
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#define SEMAPHORE_HH
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#include <cerrno>
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#include <cstring>
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#include <stdexcept>
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#include <semaphore.h>
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class semaphore {
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sem_t sem;
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semaphore(const semaphore &) = delete;
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semaphore& operator=(const semaphore &) = delete;
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public:
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semaphore(unsigned int value = 0) throw(std::logic_error)
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{
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if(sem_init(&sem, 0, value))
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throw std::logic_error(strerror(errno));
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}
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~semaphore() throw()
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{ sem_destroy(&sem); }
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void post() throw(std::overflow_error)
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{
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if(sem_post(&sem))
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throw std::overflow_error(strerror(errno));
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}
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void wait() throw()
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{
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while(sem_wait(&sem)) {
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if(errno != EINTR)
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abort();
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}
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}
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bool trywait() throw()
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{
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while(sem_trywait(&sem)) {
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if(errno == EAGAIN)
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return false;
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else if(errno != EINTR)
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abort();
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}
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return true;
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}
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};
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#endif
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