tesla_class_global.c

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/*-
 * Copyright (c) 2011 Robert N. M. Watson
 * Copyright (c) 2012-2013 Jonathan Anderson
 * All rights reserved.
 *
 * This software was developed by SRI International and the University of
 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
 * ("CTSRD"), as part of the DARPA CRASH research programme.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id$
 */

#include "tesla_internal.h"

static void     tesla_class_global_lock_init(struct tesla_class *tsp);
static void     tesla_class_global_lock_destroy(struct tesla_class *tsp);

int
tesla_class_global_postinit(struct tesla_class *tsp)
{

        assert(tsp->tc_context == TESLA_CONTEXT_GLOBAL);
        tesla_class_global_lock_init(tsp);
        return (TESLA_SUCCESS);
}

void
tesla_class_global_acquire(struct tesla_class *tsp)
{

        assert(tsp->tc_context == TESLA_CONTEXT_GLOBAL);
        tesla_lock(&tsp->tc_lock);
}

void
tesla_class_global_release(struct tesla_class *tsp)
{

        assert(tsp->tc_context == TESLA_CONTEXT_GLOBAL);
        tesla_unlock(&tsp->tc_lock);
}

void
tesla_class_global_destroy(struct tesla_class *tsp)
{

        tesla_class_global_lock_destroy(tsp);
}


/*
 * Currently, this serialises all automata associated with a globally-scoped
 * assertion.  This is undesirable, and we should think about something more
 * granular, such as using key values to hash to locks.  This might cause
 * atomicity problems when composing multi-clause expressions, however; more
 * investigation required.
 */
void
tesla_class_global_lock_init(struct tesla_class *tsp)
{

#ifdef _KERNEL
        mtx_init(&tsp->tc_lock, "tesla", NULL, MTX_DEF);
#else
        __debug int error = pthread_mutex_init(&tsp->tc_lock, NULL);
        assert(error == 0);
#endif
}

void
tesla_class_global_lock_destroy(struct tesla_class *tsp)
{

#ifdef _KERNEL
        mtx_destroy(&tsp->tc_lock);
#else
        __debug int error = pthread_mutex_destroy(&tsp->tc_lock);
        assert(error == 0);
#endif
}