RAUL
0.7.0
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00001 /* This file is part of Raul. 00002 * Copyright (C) 2007-2009 David Robillard <http://drobilla.net> 00003 * 00004 * Raul is free software; you can redistribute it and/or modify it under the 00005 * terms of the GNU General Public License as published by the Free Software 00006 * Foundation; either version 2 of the License, or (at your option) any later 00007 * version. 00008 * 00009 * Raul is distributed in the hope that it will be useful, but WITHOUT ANY 00010 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 00011 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details. 00012 * 00013 * You should have received a copy of the GNU General Public License along 00014 * with this program; if not, write to the Free Software Foundation, Inc., 00015 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00016 */ 00017 00018 #ifndef RAUL_SEMAPHORE_HPP 00019 #define RAUL_SEMAPHORE_HPP 00020 00021 #include <semaphore.h> 00022 #include <boost/utility.hpp> 00023 00024 namespace Raul { 00025 00026 00031 class Semaphore : boost::noncopyable { 00032 public: 00033 inline Semaphore(unsigned int initial) { sem_init(&_sem, 0, initial); } 00034 00035 inline ~Semaphore() { sem_destroy(&_sem); } 00036 00037 inline void reset(unsigned int initial) { 00038 sem_destroy(&_sem); 00039 sem_init(&_sem, 0, initial); 00040 } 00041 00042 inline bool has_waiter() { 00043 int val; 00044 sem_getvalue(&_sem, &val); 00045 return (val <= 0); 00046 } 00047 00052 inline void post() { sem_post(&_sem); } 00053 00061 inline void wait() { while (sem_wait(&_sem) != 0) {} } 00062 00069 inline bool try_wait() { return (sem_trywait(&_sem) == 0); } 00070 00071 private: 00072 sem_t _sem; 00073 }; 00074 00075 00076 } // namespace Raul 00077 00078 #endif // RAUL_SEMAPHORE_HPP