69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
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/**************************************************************************
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*
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* Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. The name of Kip Macy nor the names of other
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*
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***************************************************************************/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/ktr.h>
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#include <sys/buf_ring.h>
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struct buf_ring *
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buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock)
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{
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struct buf_ring *br;
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KASSERT(powerof2(count), ("buf ring must be size power of 2"));
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br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t),
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type, flags|M_ZERO);
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if (br == NULL)
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return (NULL);
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#ifdef DEBUG_BUFRING
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br->br_lock = lock;
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#endif
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br->br_prod_size = br->br_cons_size = count;
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br->br_prod_mask = br->br_cons_mask = count-1;
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br->br_prod_head = br->br_cons_head = 0;
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br->br_prod_tail = br->br_cons_tail = 0;
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return (br);
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}
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void
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buf_ring_free(struct buf_ring *br, struct malloc_type *type)
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{
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free(br, type);
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}
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