86 строки
2.3 KiB
C
86 строки
2.3 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; -*- */
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/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2007 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 2010 Cisco Systems, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "opal_config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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#include "opal/constants.h"
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#include "opal/class/opal_ring_buffer.h"
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#include "opal/util/output.h"
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static void opal_ring_buffer_construct(opal_ring_buffer_t *);
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static void opal_ring_buffer_destruct(opal_ring_buffer_t *);
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OBJ_CLASS_INSTANCE(opal_ring_buffer_t, opal_object_t,
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opal_ring_buffer_construct,
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opal_ring_buffer_destruct);
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/*
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* opal_ring_buffer constructor
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*/
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static void opal_ring_buffer_construct(opal_ring_buffer_t *ring)
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{
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OBJ_CONSTRUCT(&ring->lock, opal_mutex_t);
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ring->head = NULL;
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ring->tail = NULL;
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ring->size = 0;
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ring->addr = NULL;
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}
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/*
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* opal_ring_buffer destructor
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*/
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static void opal_ring_buffer_destruct(opal_ring_buffer_t *ring)
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{
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if( NULL != ring->addr) {
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free(ring->addr);
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ring->addr = NULL;
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}
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ring->size = 0;
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OBJ_DESTRUCT(&ring->lock);
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}
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/**
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* initialize a ring object
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*/
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int opal_ring_buffer_init(opal_ring_buffer_t* ring, int size)
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{
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/* check for errors */
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if (NULL == ring) {
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return OPAL_ERR_BAD_PARAM;
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}
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/* Allocate and set the ring to NULL */
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ring->addr = (char **)calloc(size * sizeof(char*), 1);
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if (NULL == ring->addr) { /* out of memory */
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return OPAL_ERR_OUT_OF_RESOURCE;
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}
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ring->size = size;
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/* point the head to the first location */
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ring->head = &ring->addr[0];
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return OPAL_SUCCESS;
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}
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