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https://git.proxmox.com/git/mirror_frr
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acddc0ed3c
Done with a combination of regex'ing and banging my head against a wall. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* FRR ID Number Allocator
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* Copyright (C) 2018 Amazon.com, Inc. or its affiliates
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*/
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#ifndef _ZEBRA_ID_ALLOC_H
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#define _ZEBRA_ID_ALLOC_H
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#include <strings.h>
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#include <limits.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define IDALLOC_INVALID 0
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#define IDALLOC_DIR_BITS 8
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#define IDALLOC_SUBDIR_BITS 7
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#define IDALLOC_PAGE_BITS 7
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#define IDALLOC_WORD_BITS 5
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#define IDALLOC_OFFSET_BITS 5
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#define IDALLOC_DIR_COUNT (1 << IDALLOC_DIR_BITS)
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#define IDALLOC_SUBDIR_COUNT (1 << IDALLOC_SUBDIR_BITS)
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#define IDALLOC_PAGE_COUNT (1 << IDALLOC_PAGE_BITS)
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#define IDALLOC_WORD_COUNT (1 << IDALLOC_WORD_BITS)
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struct id_alloc_page {
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/* Bitmask of allocations. 1s indicates the ID is already allocated. */
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uint32_t allocated_mask[IDALLOC_WORD_COUNT];
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/* Bitmask for free space in allocated_mask. 1s indicate whole 32 bit
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* section is full.
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*/
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uint32_t full_word_mask;
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/* The ID that bit 0 in allocated_mask corresponds to. */
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uint32_t base_value;
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struct id_alloc_page
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*next_has_free; /* Next page with at least one bit open */
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};
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struct id_alloc_subdir {
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struct id_alloc_page *sublevels[IDALLOC_PAGE_COUNT];
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};
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struct id_alloc_dir {
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struct id_alloc_subdir *sublevels[IDALLOC_SUBDIR_COUNT];
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};
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struct id_alloc {
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struct id_alloc_dir *sublevels[IDALLOC_DIR_COUNT];
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struct id_alloc_page *has_free;
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char *name;
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uint32_t allocated, capacity;
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};
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struct id_alloc_pool {
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struct id_alloc_pool *next;
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uint32_t id;
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};
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void idalloc_free(struct id_alloc *alloc, uint32_t id);
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void idalloc_free_to_pool(struct id_alloc_pool **pool_ptr, uint32_t id);
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void idalloc_drain_pool(struct id_alloc *alloc,
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struct id_alloc_pool **pool_ptr);
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uint32_t idalloc_allocate(struct id_alloc *alloc);
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uint32_t idalloc_allocate_prefer_pool(struct id_alloc *alloc,
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struct id_alloc_pool **pool_ptr);
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uint32_t idalloc_reserve(struct id_alloc *alloc, uint32_t id);
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struct id_alloc *idalloc_new(const char *name);
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void idalloc_destroy(struct id_alloc *alloc);
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#ifdef __cplusplus
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}
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#endif
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#endif
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