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136 lines
4.6 KiB
136 lines
4.6 KiB
/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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#ifndef ZABBIX_SHMEM_H
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#define ZABBIX_SHMEM_H
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#include "zbxtypes.h"
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#define SHMEM_MIN_ALLOC 24 /* should be a multiple of 8 and at least (2 * ZBX_PTR_SIZE) */
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#define ZBX_SHMEM_MIN_BUCKET_SIZE SHMEM_MIN_ALLOC
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#define SHMEM_MAX_BUCKET_SIZE 256 /* starting from this size all free chunks are put into the same bucket */
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#define ZBX_SHMEM_BUCKET_COUNT ((SHMEM_MAX_BUCKET_SIZE - ZBX_SHMEM_MIN_BUCKET_SIZE) / 8 + 1)
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typedef struct
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{
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void *base;
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void **buckets;
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void *lo_bound;
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void *hi_bound;
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zbx_uint64_t free_size;
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zbx_uint64_t used_size;
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zbx_uint64_t orig_size;
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zbx_uint64_t total_size;
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int shm_id;
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/* Continue execution in out of memory situation. */
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/* Normally allocator forces exit when it runs out of allocatable memory. */
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/* Set this flag to 1 to allow execution in out of memory situations. */
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char allow_oom;
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const char *mem_descr;
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const char *mem_param;
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}
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zbx_shmem_info_t;
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typedef struct
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{
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zbx_uint64_t free_size;
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zbx_uint64_t used_size;
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zbx_uint64_t min_chunk_size;
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zbx_uint64_t max_chunk_size;
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zbx_uint64_t overhead;
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unsigned int chunks_num[ZBX_SHMEM_BUCKET_COUNT];
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unsigned int free_chunks;
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unsigned int used_chunks;
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}
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zbx_shmem_stats_t;
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int zbx_shmem_create(zbx_shmem_info_t **info, zbx_uint64_t size, const char *descr, const char *param,
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int allow_oom, char **error);
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int zbx_shmem_create_min(zbx_shmem_info_t **info, zbx_uint64_t size, const char *descr, const char *param,
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int allow_oom, char **error);
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void zbx_shmem_destroy(zbx_shmem_info_t *info);
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#define zbx_shmem_malloc(info, old, size) __zbx_shmem_malloc(__FILE__, __LINE__, info, old, size)
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#define zbx_shmem_realloc(info, old, size) __zbx_shmem_realloc(__FILE__, __LINE__, info, old, size)
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#define zbx_shmem_free(info, ptr) \
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\
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do \
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{ \
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__zbx_shmem_free(__FILE__, __LINE__, info, ptr);\
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ptr = NULL; \
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} \
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while (0)
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void *__zbx_shmem_malloc(const char *file, int line, zbx_shmem_info_t *info, const void *old, size_t size);
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void *__zbx_shmem_realloc(const char *file, int line, zbx_shmem_info_t *info, void *old, size_t size);
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void __zbx_shmem_free(const char *file, int line, zbx_shmem_info_t *info, void *ptr);
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void zbx_shmem_clear(zbx_shmem_info_t *info);
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void zbx_shmem_get_stats(const zbx_shmem_info_t *info, zbx_shmem_stats_t *stats);
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void zbx_shmem_dump_stats(int level, zbx_shmem_info_t *info);
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size_t zbx_shmem_required_size(int chunks_num, const char *descr, const char *param);
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zbx_uint64_t zbx_shmem_required_chunk_size(zbx_uint64_t size);
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#define ZBX_SHMEM_FUNC1_DECL_MALLOC(__prefix) \
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static void *__prefix ## _shmem_malloc_func(void *old, size_t size)
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#define ZBX_SHMEM_FUNC1_DECL_REALLOC(__prefix) \
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static void *__prefix ## _shmem_realloc_func(void *old, size_t size)
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#define ZBX_SHMEM_FUNC1_DECL_FREE(__prefix) \
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static void __prefix ## _shmem_free_func(void *ptr)
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#define ZBX_SHMEM_FUNC1_IMPL_MALLOC(__prefix, __info) \
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\
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static void *__prefix ## _shmem_malloc_func(void *old, size_t size) \
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{ \
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return zbx_shmem_malloc(__info, old, size); \
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}
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#define ZBX_SHMEM_FUNC1_IMPL_REALLOC(__prefix, __info) \
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\
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static void *__prefix ## _shmem_realloc_func(void *old, size_t size)\
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{ \
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return zbx_shmem_realloc(__info, old, size); \
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}
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#define ZBX_SHMEM_FUNC1_IMPL_FREE(__prefix, __info) \
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\
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static void __prefix ## _shmem_free_func(void *ptr) \
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{ \
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zbx_shmem_free(__info, ptr); \
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}
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#define ZBX_SHMEM_FUNC_DECL(__prefix) \
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\
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ZBX_SHMEM_FUNC1_DECL_MALLOC(__prefix); \
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ZBX_SHMEM_FUNC1_DECL_REALLOC(__prefix); \
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ZBX_SHMEM_FUNC1_DECL_FREE(__prefix);
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#define ZBX_SHMEM_FUNC_IMPL(__prefix, __info) \
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\
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ZBX_SHMEM_FUNC1_IMPL_MALLOC(__prefix, __info) \
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ZBX_SHMEM_FUNC1_IMPL_REALLOC(__prefix, __info) \
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ZBX_SHMEM_FUNC1_IMPL_FREE(__prefix, __info)
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#endif /* ZABBIX_SHMEM_H */
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