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5e2444690b
These are necessary to use functions defined in these headers from C++. Signed-off-by: David Lamparter <equinox@diac24.net> Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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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