semaphore.hxx

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/*
 *   xyzzy
 *   Copyright (C) 2007    Karl W. Pfalzer
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation; either version 2
 *   of the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the
 *   Free Software Foundation, Inc.
 *   51 Franklin Street, Fifth Floor
 *   Boston, MA  02110-1301, USA.
 */

#if !defined(_xyzzy_semaphore_hxx_)
#    define  _xyzzy_semaphore_hxx_

#include <semaphore.h>

namespace xyzzy
{

class TSemaphore
{
public:
    explicit TSemaphore(int val = 0, bool shared = true);

    int getValue() const;

    // Increment semaphore value.
    void post();

    // If value >0, decr and return.
    // If value==0, wait until value>0, then decr and return.
    void wait();

private:
    sem_t   m_sem;
};

};

#endif  //_xyzzy_semaphore_hxx_

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