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Semaphore.hpp

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

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