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5ea39eaa96
Use a hierarchical bitmap in a routing table to assign ids to routes, and then use bitmaps (indexed by route id) in channels to keep track whether routes were exported. This avoids unreliable and inefficient re-evaluation of filters for old routes in order to determine whether they were exported.
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/*
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* BIRD Library -- Bitmaps
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*
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* (c) 2019 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2019 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_BITMAP_H_
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#define _BIRD_BITMAP_H_
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struct bmap
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{
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u32 size;
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u32 *data;
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};
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void bmap_init(struct bmap *b, pool *p, uint size);
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void bmap_reset(struct bmap *b, uint size);
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void bmap_grow(struct bmap *b, uint need);
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void bmap_free(struct bmap *b);
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static inline uint bmap_max(struct bmap *b)
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{ return 8 * b->size; }
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static inline int bmap_test(struct bmap *b, uint n)
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{ return (n < bmap_max(b)) && BIT32_TEST(b->data, n); }
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static inline void bmap_set(struct bmap *b, uint n)
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{
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if (n >= bmap_max(b)) bmap_grow(b, n/8 + 1);
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BIT32_SET(b->data, n);
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}
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static inline void bmap_clear(struct bmap *b, uint n)
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{
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if (n >= bmap_max(b)) return;
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BIT32_CLR(b->data, n);
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}
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struct hmap
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{
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u32 size[4];
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u32 *data[4];
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u32 root[8];
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};
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static inline uint hmap_max(struct hmap *b)
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{ return 8 * b->size[0]; }
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static inline int hmap_test(struct hmap *b, uint n)
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{ return (n < hmap_max(b)) && BIT32_TEST(b->data[0], n); }
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void hmap_init(struct hmap *b, pool *p, uint size);
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void hmap_free(struct hmap *b);
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void hmap_set(struct hmap *b, uint n);
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void hmap_clear(struct hmap *b, uint n);
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u32 hmap_first_zero(struct hmap *b);
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void hmap_check(struct hmap *b);
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#endif
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