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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
ngx_pool_t *ngx_create_pool(size_t size, ngx_log_t *log)
{
ngx_pool_t *p;
if (!(p = ngx_alloc(size, log))) {
return NULL;
}
p->last = (char *) p + sizeof(ngx_pool_t);
p->end = (char *) p + size;
p->next = NULL;
p->large = NULL;
p->log = log;
return p;
}
void ngx_destroy_pool(ngx_pool_t *pool)
{
ngx_pool_t *p, *n;
ngx_pool_large_t *l;
for (l = pool->large; l; l = l->next) {
ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p", l->alloc);
if (l->alloc) {
free(l->alloc);
}
}
#if (NGX_DEBUG)
/*
* we could allocate the pool->log from this pool
* so we can not use this log while the free()ing the pool
*/
for (p = pool, n = pool->next; /* void */; p = n, n = n->next) {
ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, pool->log, 0,
"free: %p, unused: %uz", p, p->end - p->last);
if (n == NULL) {
break;
}
}
#endif
for (p = pool, n = pool->next; /* void */; p = n, n = n->next) {
free(p);
if (n == NULL) {
break;
}
}
}
void *ngx_palloc(ngx_pool_t *pool, size_t size)
{
char *m;
ngx_pool_t *p, *n;
ngx_pool_large_t *large, *last;
if (size <= (size_t) NGX_MAX_ALLOC_FROM_POOL
&& size <= (size_t) (pool->end - (char *) pool)
- (size_t) ngx_align(sizeof(ngx_pool_t)))
{
for (p = pool, n = pool->next; /* void */; p = n, n = n->next) {
m = ngx_align(p->last);
if ((size_t) (p->end - m) >= size) {
p->last = m + size;
return m;
}
if (n == NULL) {
break;
}
}
/* allocate a new pool block */
if (!(n = ngx_create_pool((size_t) (p->end - (char *) p), p->log))) {
return NULL;
}
p->next = n;
m = ngx_align(n->last);
n->last = m + size;
return m;
}
/* allocate a large block */
large = NULL;
last = NULL;
if (pool->large) {
for (last = pool->large; /* void */ ; last = last->next) {
if (last->alloc == NULL) {
large = last;
last = NULL;
break;
}
if (last->next == NULL) {
break;
}
}
}
if (large == NULL) {
if (!(large = ngx_palloc(pool, sizeof(ngx_pool_large_t)))) {
return NULL;
}
large->next = NULL;
}
#if 0
if (!(p = ngx_memalign(ngx_pagesize, size, pool->log))) {
return NULL;
}
#else
if (!(p = ngx_alloc(size, pool->log))) {
return NULL;
}
#endif
if (pool->large == NULL) {
pool->large = large;
} else if (last) {
last->next = large;
}
large->alloc = p;
return p;
}
ngx_int_t ngx_pfree(ngx_pool_t *pool, void *p)
{
ngx_pool_large_t *l;
for (l = pool->large; l; l = l->next) {
if (p == l->alloc) {
ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0,
"free: %p", l->alloc);
free(l->alloc);
l->alloc = NULL;
return NGX_OK;
}
}
return NGX_DECLINED;
}
void *ngx_pcalloc(ngx_pool_t *pool, size_t size)
{
void *p;
p = ngx_palloc(pool, size);
if (p) {
ngx_memzero(p, size);
}
return p;
}
#if 0
static void *ngx_get_cached_block(size_t size)
{
void *p;
ngx_cached_block_slot_t *slot;
if (ngx_cycle->cache == NULL) {
return NULL;
}
slot = &ngx_cycle->cache[(size + ngx_pagesize - 1) / ngx_pagesize];
slot->tries++;
if (slot->number) {
p = slot->block;
slot->block = slot->block->next;
slot->number--;
return p;
}
return NULL;
}
#endif
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