зеркало из https://github.com/microsoft/git.git
56 строки
1.2 KiB
C
56 строки
1.2 KiB
C
/*
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* Memory Pool implementation logic.
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*/
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#include "cache.h"
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#include "mem-pool.h"
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static struct mp_block *mem_pool_alloc_block(struct mem_pool *mem_pool, size_t block_alloc)
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{
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struct mp_block *p;
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mem_pool->pool_alloc += sizeof(struct mp_block) + block_alloc;
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p = xmalloc(st_add(sizeof(struct mp_block), block_alloc));
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p->next_block = mem_pool->mp_block;
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p->next_free = (char *)p->space;
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p->end = p->next_free + block_alloc;
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mem_pool->mp_block = p;
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return p;
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}
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void *mem_pool_alloc(struct mem_pool *mem_pool, size_t len)
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{
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struct mp_block *p;
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void *r;
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/* round up to a 'uintmax_t' alignment */
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if (len & (sizeof(uintmax_t) - 1))
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len += sizeof(uintmax_t) - (len & (sizeof(uintmax_t) - 1));
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for (p = mem_pool->mp_block; p; p = p->next_block)
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if (p->end - p->next_free >= len)
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break;
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if (!p) {
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if (len >= (mem_pool->block_alloc / 2)) {
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mem_pool->pool_alloc += len;
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return xmalloc(len);
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}
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p = mem_pool_alloc_block(mem_pool, mem_pool->block_alloc);
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}
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r = p->next_free;
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p->next_free += len;
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return r;
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}
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void *mem_pool_calloc(struct mem_pool *mem_pool, size_t count, size_t size)
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{
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size_t len = st_mult(count, size);
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void *r = mem_pool_alloc(mem_pool, len);
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memset(r, 0, len);
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return r;
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}
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