Stone Three Foundation Classes

00001 /*
00002  * Stone Three Foundation Class (s3fc) provides a number of utility classes.
00003  * Copyright (C) 2001 by Stone Three Signal Processing (Pty) Ltd.
00004  *
00005  * Authored by Stone Three Signal Processing (Pty) Ltd.
00006  *
00007  * This library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  * 
00012  * This library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with this library; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00020  * 
00021  * Please see the file 'COPYING' in the source root directory.
00022  */
00023 
00033 #ifndef S3_SEMAPHORE_H
00034 #define S3_SEMAPHORE_H
00035 
00036 #include <semaphore.h>
00037 
00068 class s3_semaphore
00069 {
00070   protected:
00074    sem_t sem;
00075   public:
00085    s3_semaphore(int n_value = 0);
00089    ~s3_semaphore();
00090    // minimise the chances of people blowing off their whole leg in a
00091    // controlled attempt at shooting themselves in the foot
00092   private:
00097    s3_semaphore(const s3_semaphore& src);
00101    s3_semaphore& operator=(const s3_semaphore& src);
00102   public:
00109    void wait() const;
00118    bool try_wait() const;
00125    void post() const;
00130    int get_value() const;
00135    void flush() const;
00136 };
00137 
00138 #endif
s3_semaphore.h
