aed75f3d1d
Change-Id: I188e2dfd187d7b2ab7e0fbb11461f3db052f3224 Signed-off-by: Damjan Marion <damarion@cisco.com>
135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
/*
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* Copyright (c) 2018 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef included_ring_h
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#define included_ring_h
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#include <vppinfra/error.h>
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#include <vppinfra/format.h>
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#include <vppinfra/vec.h>
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#include <vppinfra/vector.h>
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typedef struct
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{
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u32 next, n_enq;
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} clib_ring_header_t;
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always_inline clib_ring_header_t *
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clib_ring_header (void *v)
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{
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return vec_aligned_header (v, sizeof (clib_ring_header_t), sizeof (void *));
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}
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always_inline void
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clib_ring_new_inline (void **p, u32 elt_bytes, u32 size, u32 align)
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{
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void *v;
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clib_ring_header_t *h;
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v = _vec_resize ((void *) 0,
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/* length increment */ size,
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/* data bytes */ elt_bytes * size,
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/* header bytes */ sizeof (h[0]),
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/* data align */ align);
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h = clib_ring_header (v);
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h->next = 0;
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h->n_enq = 0;
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p[0] = v;
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}
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#define clib_ring_new_aligned(ring, size, align) \
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{ clib_ring_new_inline ((void **)&(ring), sizeof(ring[0]), size, align); }
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#define clib_ring_new(ring, size) \
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{ clib_ring_new_inline ((void **)&(ring), sizeof(ring[0]), size, 0);}
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#define clib_ring_free(f) vec_free_h((f), sizeof(clib_ring_header_t))
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always_inline u32
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clib_ring_n_enq (void *v)
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{
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clib_ring_header_t *h = clib_ring_header (v);
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return h->n_enq;
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}
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always_inline void *
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clib_ring_get_last_inline (void *v, u32 elt_bytes, int enqueue)
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{
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clib_ring_header_t *h = clib_ring_header (v);
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u32 slot;
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if (enqueue)
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{
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if (h->n_enq == _vec_len (v))
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return 0;
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slot = h->next;
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h->n_enq++;
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h->next++;
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if (h->next == _vec_len (v))
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h->next = 0;
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}
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else
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{
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if (h->n_enq == 0)
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return 0;
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slot = h->next == 0 ? _vec_len (v) - 1 : h->next - 1;
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}
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return (void *) ((u8 *) v + elt_bytes * slot);
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}
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#define clib_ring_enq(ring) \
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clib_ring_get_last_inline (ring, sizeof(ring[0]), 1)
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#define clib_ring_get_last(ring) \
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clib_ring_get_last_inline (ring, sizeof(ring[0]), 0)
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always_inline void *
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clib_ring_get_first_inline (void *v, u32 elt_bytes, int dequeue)
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{
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clib_ring_header_t *h = clib_ring_header (v);
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u32 slot;
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if (h->n_enq == 0)
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return 0;
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if (h->n_enq > h->next)
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slot = _vec_len (v) + h->next - h->n_enq;
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else
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slot = h->next - h->n_enq;
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if (dequeue)
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h->n_enq--;
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return (void *) ((u8 *) v + elt_bytes * slot);
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}
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#define clib_ring_deq(ring) \
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clib_ring_get_first_inline (ring, sizeof(ring[0]), 1)
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#define clib_ring_get_first(ring) \
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clib_ring_get_first_inline (ring, sizeof(ring[0]), 0)
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#endif /* included_ring_h */
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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