rc_mutex.cpp

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// vim:set et sts=4 ts=4 tw=75 sw=4 ai ci cin cino=g0,t0:
/*
 * Copyright (C) 2007, Technical Computer Science Group,
 *                     University of Bonn
 *
 * This file is part of the ReChannel library.
 *
 * The ReChannel library 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 library 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 library; see the file COPYING. If not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * Authors: Andreas Raabe and Armin Felke. Implementation by Armin Felke.
 *          {raabe, felke}@cs.uni-bonn.de
 */
#include "rc_mutex.h"

namespace ReChannel {

rc_mutex::rc_mutex()
    : rc_prim_channel(sc_gen_unique_name("mutex"))
{ }

rc_mutex::rc_mutex(const char* name_)
    : rc_prim_channel(name_)
{ }

void rc_mutex::rc_on_reset()
{
    rc_prim_channel::rc_on_reset();

    // reset the mutex state
    m_lock_owner = sc_process_handle();
    rc_notify(m_free);
}

int rc_mutex::lock()
{
    while(this->is_locked()) {
        rc_wait(m_free);
    }
    m_lock_owner = sc_get_current_process_handle();
    return 0;
}

int rc_mutex::trylock()
{
    if (this->is_locked()) {
        return -1;
    }
    m_lock_owner = sc_get_current_process_handle();
    return 0;
}

int rc_mutex::unlock()
{
    if (m_lock_owner != sc_get_current_process_handle()) {
        return -1;
    }
    m_lock_owner = sc_process_handle();
    rc_notify(m_free);
    return 0;
}

} // namespace ReChannel

//
// $Id: rc_mutex.cpp,v 1.3 2007/10/09 00:22:26 felke Exp $
// $Source: /var/cvs/projekte/ReChannel-v2/src/ReChannel/components/rc_mutex.cpp,v $
//

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