C语言内存池使用模型-2

static struct pfree *_pool_free(pool_t p, pool_cleanup_t f, void *arg)
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    struct pfree *ret;51Testing软件测试网v!s^J;rK[7j}
    while((ret = malloc(sizeof(struct pfree))) == NULL) sleep(1);51Testing软件测试网w?k!O;aiZ
    ret->f = f;
*rU$? ?cS5^0    ret->arg = arg;51Testing软件测试网kA H:`x7r*s'Qc
    ret->next = NULL;

\(s(sbp5Uj7P\2_0    return ret;
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static void _pool_cleanup_append(pool_t p, struct pfree *pf)51Testing软件测试网H`y;Y9CB5K
{51Testing软件测试网3Saf*R!TbT;s9Pv-^2k
    struct pfree *cur;51Testing软件测试网8pQ3kW:~V6[

[5U3|}P$MSTo0    if(p->cleanup == NULL)
.Fo7G6~_+BfhMl2?0    {51Testing软件测试网_}^#T5x+b+jX
        p->cleanup = pf;51Testing软件测试网h gHJ$mScAG
        p->cleanup_tail = pf;
TG{j]0        return;51Testing软件测试网'j2u3J{_
    }51Testing软件测试网;]euf;Y%sG

s6V!tTK;{tB#A0    cur = p->cleanup_tail;
/P'aBB6|+E0    cur->next = pf;51Testing软件测试网U8b\`(p Aq
    p->cleanup_tail = pf;
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y!V8a*Y2o@BO#L0void pool_free(pool_t p)51Testing软件测试网^+^rVdT}
{
^U3WJe4F7O;`2v(OS0    struct pfree *cur, *stub;

$K _'p!C(\7`0    if(p == NULL) return;51Testing软件测试网:W6[-x ejZ[

    cur = p->cleanup;51Testing软件测试网.@A)JsC;\7u`A
    while(cur != NULL)51Testing软件测试网3u/G
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    {51Testing软件测试网oF'\QK3^
        (*cur->f)(cur->arg); // 这会释放用malloc分配的内存块和struct pheap结构所占用的内存。这就是前文的_pool_heap_free函数51Testing软件测试网zV9w-oa5_
 stub = cur->next;51Testing软件测试网$G'B"Ko)UW
 free(cur);  // 释放pfree结构。
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E0 cur = stub;51Testing软件测试网*dJ/{]2`V
    }
N1w&w~:B]Y}s g0    free(p); //释放pool_struct结构所占用的内存。51Testing软件测试网&[[2c0u-f1\ _
}51Testing软件测试网1Y4E
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void *pool_malloc(pool_t p, int size)51Testing软件测试网'}\uA7]YG
{51Testing软件测试网)`K |!b}o
    void *block;

?)AA^w7h\0    if(p == NULL)
fn7~{4xj0    {51Testing软件测试网
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        fprintf(stderr,"Memory Leak! [pmalloc received NULL pool, unable to track allocation, exiting]\n");51Testing软件测试网e)?:Nfq.d}:`+YO7Q
        abort();51Testing软件测试网wn;TAc cV3T
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    }51Testing软件测试网Ct:J I2z)h8Pt:o S

"h!h:MmUWJ0    if(p->heap == NULL || size > (p->heap->size / 2))
"_5?2@gD,tpt0    {51Testing软件测试网DzGd4[b)^
        while((block = malloc(size)) == NULL) sleep(1);51Testing软件测试网$}5DJ)fc wEO
        p->size += size;51Testing软件测试网$iO^V1M5wQ
        _pool_cleanup_append(p, _pool_free(p, _pool__free, block));
a4N2q#^1|\%G8D0        return block;
VEDCP0{}0    }

    if(size >= 4)51Testing软件测试网TB4qtr0D%t"L6h hr
        while(p->heap->used&7) p->heap->used++; // 这一步是个对齐操作，如果已经使用的不是8的倍数，就会跳过，直到为8的倍数。51Testing软件测试网(|{:PgA8f*e1k6IP%K

    if(size > (p->heap->size - p->heap->used))51Testing软件测试网}1[#\G-`6^
        p->heap = _pool_heap(p, p->heap->size);

    block = (char *)p->heap->block + p->heap->used;
K TG0O"T$Qk0    p->heap->used += size; //已经使用部分增加，也会使得内存分配的偏移值指针增加。51Testing软件测试网6Yi;X'}$d_,H pq
    return block;51Testing软件测试网 V
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