/*

 * Copyright (c) 2004-2006 Maxim Sobolev <sobomax@FreeBSD.org>

 * Copyright (c) 2006-2015 Sippy Software, Inc., http://www.sippysoft.com

 * All rights reserved.

 *

 * 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.

 *

 */

#include <stdatomic.h>

#include <stddef.h>

#include <stdint.h>

#include <stdlib.h>

#include "rtpp_types.h"

#include "rtpp_refcnt.h"

#include "rtpp_genuid.h"

#include "rtpp_genuid_fin.h"

#include "rtpp_mallocs.h"

struct rtpp_genuid_priv {

    struct rtpp_genuid pub;

    _Atomic(uint64_t) lastuid;

};

static uint64_t rtpp_genuid_gen(struct rtpp_genuid *);

DEFINE_SMETHODS(rtpp_genuid,

    .gen = &rtpp_genuid_gen,

);

struct rtpp_genuid *

rtpp_genuid_ctor(void)

{

    struct rtpp_genuid_priv *pvt;

    pvt = rtpp_rzmalloc(sizeof(struct rtpp_genuid_priv), PVT_RCOFFS(pvt));

    if (pvt == NULL) {

        goto e0;

    }

    atomic_init(&pvt->lastuid, 0);

#if defined(RTPP_DEBUG)

    pvt->pub.smethods = GET_SMETHODS(&pvt->pub);

    RTPP_OBJ_DTOR_ATTACH(&pvt->pub, (rtpp_refcnt_dtor_t)&rtpp_genuid_fin,

      &(pvt->pub));

#endif

    return (&pvt->pub);

e0:

    return (NULL);

}

static uint64_t

rtpp_genuid_gen(struct rtpp_genuid *pub)

{

    struct rtpp_genuid_priv *pvt;

    PUB2PVT(pub, pvt);

    return atomic_fetch_add_explicit(&(pvt->lastuid), 1,

      memory_order_relaxed);

}