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mem-pool: fill out functionality 

Add functions for:

    - combining two memory pools

    - determining if a memory address is within the range managed by a
      memory pool

These functions will be used by future commits.

Signed-off-by: Jameson Miller <jamill@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jameson Miller 2018-07-02 19:49:35 +00:00 committed by Junio C Hamano
parent 158dfeff3d
commit 0e58301d81
2 changed files with 55 additions and 0 deletions
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42
mem-pool.c
View File

@ -96,3 +96,45 @@ void *mem_pool_calloc(struct mem_pool *mem_pool, size_t count, size_t size)
memset(r, 0, len);
return r;
}
int mem_pool_contains(struct mem_pool *mem_pool, void *mem)
{
struct mp_block *p;
/* Check if memory is allocated in a block */
for (p = mem_pool->mp_block; p; p = p->next_block)
if ((mem >= ((void *)p->space)) &&
(mem < ((void *)p->end)))
return 1;
return 0;
}
void mem_pool_combine(struct mem_pool *dst, struct mem_pool *src)
{
struct mp_block *p;
/* Append the blocks from src to dst */
if (dst->mp_block && src->mp_block) {
/*
* src and dst have blocks, append
* blocks from src to dst.
*/
p = dst->mp_block;
while (p->next_block)
p = p->next_block;
p->next_block = src->mp_block;
} else if (src->mp_block) {
/*
* src has blocks, dst is empty.
*/
dst->mp_block = src->mp_block;
} else {
/* src is empty, nothing to do. */
}
dst->pool_alloc += src->pool_alloc;
src->pool_alloc = 0;
src->mp_block = NULL;
}

13
mem-pool.h
View File

@ -41,4 +41,17 @@ void *mem_pool_alloc(struct mem_pool *pool, size_t len);
*/
void *mem_pool_calloc(struct mem_pool *pool, size_t count, size_t size);
/*
* Move the memory associated with the 'src' pool to the 'dst' pool. The 'src'
* pool will be empty and not contain any memory. It still needs to be free'd
* with a call to `mem_pool_discard`.
*/
void mem_pool_combine(struct mem_pool *dst, struct mem_pool *src);
/*
* Check if a memory pointed at by 'mem' is part of the range of
* memory managed by the specified mem_pool.
*/
int mem_pool_contains(struct mem_pool *mem_pool, void *mem);
#endif