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/*
* Copyright (C) 2013-2019 Argonne National Laboratory, Department of Energy,
* UChicago Argonne, LLC and The HDF Group.
* All rights reserved.
*
* The full copyright notice, including terms governing use, modification,
* and redistribution, is contained in the COPYING file that can be
* found at the root of the source code distribution tree.
*/
/* Implementation derived from:
* https://github.com/freebsd/freebsd/blob/master/sys/sys/buf_ring.h
*
* -
* Copyright (c) 2007-2009 Kip Macy <kmacy@freebsd.org>
* 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 "mercury_atomic_queue.h"
#include "mercury_util_error.h"
#include <stdlib.h>
/****************/
/* Local Macros */
/****************/
/* From <sys/param.h> */
#define powerof2(x) ((((x) -1) & (x)) == 0)
/*---------------------------------------------------------------------------*/
struct hg_atomic_queue *
hg_atomic_queue_alloc(unsigned int count)
{
struct hg_atomic_queue *hg_atomic_queue = NULL;
HG_UTIL_CHECK_ERROR_NORET(
!powerof2(count), done, "atomic queue size must be power of 2");
hg_atomic_queue = malloc(
sizeof(struct hg_atomic_queue) + count * sizeof(hg_atomic_int64_t));
HG_UTIL_CHECK_ERROR_NORET(
hg_atomic_queue == NULL, done, "Could not allocate atomic queue");
hg_atomic_queue->prod_size = hg_atomic_queue->cons_size = count;
hg_atomic_queue->prod_mask = hg_atomic_queue->cons_mask = count - 1;
hg_atomic_init32(&hg_atomic_queue->prod_head, 0);
hg_atomic_init32(&hg_atomic_queue->cons_head, 0);
hg_atomic_init32(&hg_atomic_queue->prod_tail, 0);
hg_atomic_init32(&hg_atomic_queue->cons_tail, 0);
done:
return hg_atomic_queue;
}
/*---------------------------------------------------------------------------*/
void
hg_atomic_queue_free(struct hg_atomic_queue *hg_atomic_queue)
{
free(hg_atomic_queue);
}
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