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Diffstat (limited to '')
-rw-r--r-- | contrib/mempattern.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/contrib/mempattern.h b/contrib/mempattern.h new file mode 100644 index 0000000..0b9957b --- /dev/null +++ b/contrib/mempattern.h @@ -0,0 +1,83 @@ +/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +/*! + * \brief Memory allocation related functions. + */ + +#pragma once + +#include <libknot/mm_ctx.h> +#include "lib/defines.h" +#include <assert.h> +#include <stdint.h> + +/*! \brief Default memory block size. */ +#define MM_DEFAULT_BLKSIZE 4096 + +/*! \brief Allocs using 'mm' if any, uses system malloc() otherwise. */ +KR_EXPORT +void *mm_alloc(knot_mm_t *mm, size_t size); + +/*! \brief Callocs using 'mm' if any, uses system calloc() otherwise. */ +void *mm_calloc(knot_mm_t *mm, size_t nmemb, size_t size); + +/*! \brief Reallocs using 'mm' if any, uses system realloc() otherwise. */ +KR_EXPORT +void *mm_realloc(knot_mm_t *mm, void *what, size_t size, size_t prev_size); + +/*! \brief Strdups using 'mm' if any, uses system strdup() otherwise. */ +char *mm_strdup(knot_mm_t *mm, const char *s); + +/*! \brief Free using 'mm' if any, uses system free() otherwise. */ +KR_EXPORT +void mm_free(knot_mm_t *mm, void *what); + +/*! \brief Initialize default memory allocation context. */ +void mm_ctx_init(knot_mm_t *mm); + +/*! \brief Memory pool context. */ +void mm_ctx_mempool(knot_mm_t *mm, size_t chunk_size); + + +/* API in addition to Knot's mempattern. */ + +/*! \brief Readability: avoid const-casts in code. */ +static inline void free_const(const void *what) +{ + free((void *)what); +} + +/*! \brief posix_memalign() wrapper. */ +void *mm_malloc_aligned(void *ctx, size_t n); + +/*! \brief Initialize mm with malloc+free with specified alignment (a power of two). */ +static inline void mm_ctx_init_aligned(knot_mm_t *mm, size_t alignment) +{ + assert(__builtin_popcount(alignment) == 1); + mm_ctx_init(mm); + mm->ctx = (uint8_t *)NULL + alignment; /*< roundabout to satisfy linters */ + /* posix_memalign() doesn't allow alignment < sizeof(void*), + * and there's no point in using it for small values anyway, + * as plain malloc() guarantees at least max_align_t. */ + if (alignment > sizeof(max_align_t)) { + mm->alloc = mm_malloc_aligned; + } +} + +/*! \brief New memory pool context, allocated on itself. */ +KR_EXPORT knot_mm_t * mm_ctx_mempool2(size_t chunk_size); + |