mirror of
https://github.com/nginx/nginx.git
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701 lines
18 KiB
C
701 lines
18 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#define NGX_SLAB_PAGE_MASK 3
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#define NGX_SLAB_PAGE 0
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#define NGX_SLAB_BIG 1
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#define NGX_SLAB_EXACT 2
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#define NGX_SLAB_SMALL 3
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#if (NGX_PTR_SIZE == 4)
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#define NGX_SLAB_PAGE_FREE 0
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#define NGX_SLAB_PAGE_BUSY 0xffffffff
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#define NGX_SLAB_PAGE_START 0x80000000
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#define NGX_SLAB_SHIFT_MASK 0x0000000f
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#define NGX_SLAB_MAP_MASK 0xffff0000
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#define NGX_SLAB_MAP_SHIFT 16
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#define NGX_SLAB_BUSY 0xffffffff
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#else /* (NGX_PTR_SIZE == 8) */
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#define NGX_SLAB_PAGE_FREE 0
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#define NGX_SLAB_PAGE_BUSY 0xffffffffffffffff
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#define NGX_SLAB_PAGE_START 0x8000000000000000
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#define NGX_SLAB_SHIFT_MASK 0x000000000000000f
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#define NGX_SLAB_MAP_MASK 0xffffffff00000000
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#define NGX_SLAB_MAP_SHIFT 32
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#define NGX_SLAB_BUSY 0xffffffffffffffff
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#endif
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#if (NGX_DEBUG_MALLOC)
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#define ngx_slab_junk(p, size) ngx_memset(p, 0xD0, size)
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#else
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#if (NGX_FREEBSD)
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#define ngx_slab_junk(p, size) \
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if (ngx_freebsd_debug_malloc) ngx_memset(p, 0xD0, size)
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#else
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#define ngx_slab_junk(p, size)
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#endif
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#endif
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static ngx_slab_page_t *ngx_slab_alloc_pages(ngx_slab_pool_t *pool,
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ngx_uint_t pages);
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static void ngx_slab_free_pages(ngx_slab_pool_t *pool, ngx_slab_page_t *page,
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ngx_uint_t pages);
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static void ngx_slab_error(ngx_slab_pool_t *pool, ngx_uint_t level,
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char *text);
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static ngx_uint_t ngx_slab_max_size;
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static ngx_uint_t ngx_slab_exact_size;
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static ngx_uint_t ngx_slab_exact_shift;
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void
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ngx_slab_init(ngx_slab_pool_t *pool)
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{
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u_char *p;
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size_t size;
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ngx_int_t m;
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ngx_uint_t i, n, pages;
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ngx_slab_page_t *slots;
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/* STUB */
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if (ngx_slab_max_size == 0) {
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ngx_slab_max_size = ngx_pagesize / 2;
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ngx_slab_exact_size = ngx_pagesize / (8 * sizeof(uintptr_t));
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for (n = ngx_slab_exact_size; n >>= 1; ngx_slab_exact_shift++) {
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/* void */
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}
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}
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/**/
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pool->min_size = 1 << pool->min_shift;
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p = (u_char *) pool + sizeof(ngx_slab_pool_t);
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size = pool->end - p;
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ngx_slab_junk(p, size);
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slots = (ngx_slab_page_t *) p;
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n = ngx_pagesize_shift - pool->min_shift;
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for (i = 0; i < n; i++) {
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slots[i].slab = 0;
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slots[i].next = &slots[i];
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slots[i].prev = 0;
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}
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p += n * sizeof(ngx_slab_page_t);
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pages = (ngx_uint_t) (size / (ngx_pagesize + sizeof(ngx_slab_page_t)));
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ngx_memzero(p, pages * sizeof(ngx_slab_page_t));
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pool->pages = (ngx_slab_page_t *) p;
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pool->free.prev = 0;
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pool->free.next = (ngx_slab_page_t *) p;
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pool->pages->slab = pages;
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pool->pages->next = &pool->free;
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pool->pages->prev = (uintptr_t) &pool->free;
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pool->start = (u_char *)
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ngx_align_ptr((uintptr_t) p + pages * sizeof(ngx_slab_page_t),
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ngx_pagesize);
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m = pages - (pool->end - pool->start) / ngx_pagesize;
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if (m > 0) {
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pages -= m;
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pool->pages->slab = pages;
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}
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pool->log_ctx = &pool->zero;
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pool->zero = '\0';
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}
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void *
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ngx_slab_alloc(ngx_slab_pool_t *pool, size_t size)
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{
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void *p;
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ngx_shmtx_lock(&pool->mutex);
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p = ngx_slab_alloc_locked(pool, size);
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ngx_shmtx_unlock(&pool->mutex);
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return p;
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}
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void *
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ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
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{
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size_t s;
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uintptr_t p, n, m, mask, *bitmap;
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ngx_uint_t i, slot, shift, map;
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ngx_slab_page_t *page, *prev, *slots;
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if (size >= ngx_slab_max_size) {
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ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0,
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"slab alloc: %uz", size);
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page = ngx_slab_alloc_pages(pool, (size + ngx_pagesize - 1)
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>> ngx_pagesize_shift);
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if (page) {
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p = (page - pool->pages) << ngx_pagesize_shift;
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p += (uintptr_t) pool->start;
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} else {
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p = 0;
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}
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goto done;
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}
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if (size > pool->min_size) {
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shift = 1;
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for (s = size - 1; s >>= 1; shift++) { /* void */ }
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slot = shift - pool->min_shift;
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} else {
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size = pool->min_size;
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shift = pool->min_shift;
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slot = 0;
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}
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ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0,
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"slab alloc: %uz slot: %ui", size, slot);
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slots = (ngx_slab_page_t *) ((u_char *) pool + sizeof(ngx_slab_pool_t));
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page = slots[slot].next;
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if (page->next != page) {
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if (shift < ngx_slab_exact_shift) {
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do {
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p = (page - pool->pages) << ngx_pagesize_shift;
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bitmap = (uintptr_t *) (pool->start + p);
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map = (1 << (ngx_pagesize_shift - shift))
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/ (sizeof(uintptr_t) * 8);
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for (n = 0; n < map; n++) {
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if (bitmap[n] != NGX_SLAB_BUSY) {
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for (m = 1, i = 0; m; m <<= 1, i++) {
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if ((bitmap[n] & m)) {
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continue;
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}
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bitmap[n] |= m;
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i = ((n * sizeof(uintptr_t) * 8) << shift)
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+ (i << shift);
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if (bitmap[n] == NGX_SLAB_BUSY) {
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for (n = n + 1; n < map; n++) {
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if (bitmap[n] != NGX_SLAB_BUSY) {
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p = (uintptr_t) bitmap + i;
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goto done;
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}
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}
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prev = (ngx_slab_page_t *)
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(page->prev & ~NGX_SLAB_PAGE_MASK);
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prev->next = page->next;
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page->next->prev = page->prev;
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page->next = NULL;
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page->prev = NGX_SLAB_SMALL;
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}
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p = (uintptr_t) bitmap + i;
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goto done;
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}
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}
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}
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page = page->next;
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} while (page);
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} else if (shift == ngx_slab_exact_shift) {
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do {
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if (page->slab != NGX_SLAB_BUSY) {
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for (m = 1, i = 0; m; m <<= 1, i++) {
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if ((page->slab & m)) {
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continue;
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}
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page->slab |= m;
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if (page->slab == NGX_SLAB_BUSY) {
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prev = (ngx_slab_page_t *)
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(page->prev & ~NGX_SLAB_PAGE_MASK);
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prev->next = page->next;
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page->next->prev = page->prev;
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page->next = NULL;
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page->prev = NGX_SLAB_EXACT;
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}
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p = (page - pool->pages) << ngx_pagesize_shift;
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p += i << shift;
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p += (uintptr_t) pool->start;
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goto done;
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}
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}
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page = page->next;
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} while (page);
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} else { /* shift > ngx_slab_exact_shift */
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n = ngx_pagesize_shift - (page->slab & NGX_SLAB_SHIFT_MASK);
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n = 1 << n;
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n = ((uintptr_t) 1 << n) - 1;
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mask = n << NGX_SLAB_MAP_SHIFT;
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do {
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if ((page->slab & NGX_SLAB_MAP_MASK) != mask) {
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for (m = (uintptr_t) 1 << NGX_SLAB_MAP_SHIFT, i = 0;
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m & mask;
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m <<= 1, i++)
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{
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if ((page->slab & m)) {
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continue;
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}
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page->slab |= m;
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if ((page->slab & NGX_SLAB_MAP_MASK) == mask) {
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prev = (ngx_slab_page_t *)
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(page->prev & ~NGX_SLAB_PAGE_MASK);
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prev->next = page->next;
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page->next->prev = page->prev;
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page->next = NULL;
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page->prev = NGX_SLAB_BIG;
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}
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p = (page - pool->pages) << ngx_pagesize_shift;
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p += i << shift;
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p += (uintptr_t) pool->start;
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goto done;
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}
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}
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page = page->next;
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} while (page);
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}
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}
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page = ngx_slab_alloc_pages(pool, 1);
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if (page) {
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if (shift < ngx_slab_exact_shift) {
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p = (page - pool->pages) << ngx_pagesize_shift;
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bitmap = (uintptr_t *) (pool->start + p);
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s = 1 << shift;
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n = (1 << (ngx_pagesize_shift - shift)) / 8 / s;
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if (n == 0) {
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n = 1;
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}
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bitmap[0] = (2 << n) - 1;
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map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8);
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for (i = 1; i < map; i++) {
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bitmap[i] = 0;
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}
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page->slab = shift;
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page->next = &slots[slot];
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page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_SMALL;
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slots[slot].next = page;
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p = ((page - pool->pages) << ngx_pagesize_shift) + s * n;
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p += (uintptr_t) pool->start;
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goto done;
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} else if (shift == ngx_slab_exact_shift) {
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page->slab = 1;
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page->next = &slots[slot];
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page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_EXACT;
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slots[slot].next = page;
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p = (page - pool->pages) << ngx_pagesize_shift;
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p += (uintptr_t) pool->start;
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goto done;
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} else { /* shift > ngx_slab_exact_shift */
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page->slab = ((uintptr_t) 1 << NGX_SLAB_MAP_SHIFT) | shift;
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page->next = &slots[slot];
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page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_BIG;
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slots[slot].next = page;
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p = (page - pool->pages) << ngx_pagesize_shift;
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p += (uintptr_t) pool->start;
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goto done;
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}
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}
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p = 0;
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done:
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ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0, "slab alloc: %p", p);
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return (void *) p;
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}
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void
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ngx_slab_free(ngx_slab_pool_t *pool, void *p)
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{
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ngx_shmtx_lock(&pool->mutex);
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ngx_slab_free_locked(pool, p);
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ngx_shmtx_unlock(&pool->mutex);
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}
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void
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ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
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{
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size_t size;
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uintptr_t slab, m, *bitmap;
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ngx_uint_t n, type, slot, shift, map;
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ngx_slab_page_t *slots, *page;
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ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0, "slab free: %p", p);
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if ((u_char *) p < pool->start || (u_char *) p > pool->end) {
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ngx_slab_error(pool, NGX_LOG_ALERT, "ngx_slab_free(): outside of pool");
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goto fail;
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}
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n = ((u_char *) p - pool->start) >> ngx_pagesize_shift;
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page = &pool->pages[n];
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slab = page->slab;
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type = page->prev & NGX_SLAB_PAGE_MASK;
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switch (type) {
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case NGX_SLAB_SMALL:
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shift = slab & NGX_SLAB_SHIFT_MASK;
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size = 1 << shift;
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if ((uintptr_t) p & (size - 1)) {
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goto wrong_chunk;
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}
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n = ((uintptr_t) p & (ngx_pagesize - 1)) >> shift;
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m = (uintptr_t) 1 << (n & (sizeof(uintptr_t) * 8 - 1));
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n /= (sizeof(uintptr_t) * 8);
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bitmap = (uintptr_t *) ((uintptr_t) p & ~(ngx_pagesize - 1));
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if (bitmap[n] & m) {
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if (page->next == NULL) {
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slots = (ngx_slab_page_t *)
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((u_char *) pool + sizeof(ngx_slab_pool_t));
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slot = shift - pool->min_shift;
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page->next = slots[slot].next;
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slots[slot].next = page;
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page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_SMALL;
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page->next->prev = (uintptr_t) page | NGX_SLAB_SMALL;
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}
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bitmap[n] &= ~m;
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n = (1 << (ngx_pagesize_shift - shift)) / 8 / (1 << shift);
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if (n == 0) {
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n = 1;
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}
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if (bitmap[0] & ~(((uintptr_t) 1 << n) - 1)) {
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goto done;
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}
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map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8);
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for (n = 1; n < map; n++) {
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if (bitmap[n]) {
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goto done;
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}
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}
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ngx_slab_free_pages(pool, page, 1);
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goto done;
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}
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goto chunk_already_free;
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case NGX_SLAB_EXACT:
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m = (uintptr_t) 1 <<
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(((uintptr_t) p & (ngx_pagesize - 1)) >> ngx_slab_exact_shift);
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size = ngx_slab_exact_size;
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if ((uintptr_t) p & (size - 1)) {
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goto wrong_chunk;
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}
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if (slab & m) {
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if (slab == NGX_SLAB_BUSY) {
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slots = (ngx_slab_page_t *)
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((u_char *) pool + sizeof(ngx_slab_pool_t));
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slot = ngx_slab_exact_shift - pool->min_shift;
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page->next = slots[slot].next;
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slots[slot].next = page;
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page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_EXACT;
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page->next->prev = (uintptr_t) page | NGX_SLAB_EXACT;
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}
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page->slab &= ~m;
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if (page->slab) {
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goto done;
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}
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ngx_slab_free_pages(pool, page, 1);
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goto done;
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}
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goto chunk_already_free;
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case NGX_SLAB_BIG:
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shift = slab & NGX_SLAB_SHIFT_MASK;
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size = 1 << shift;
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if ((uintptr_t) p & (size - 1)) {
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goto wrong_chunk;
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}
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m = (uintptr_t) 1 << ((((uintptr_t) p & (ngx_pagesize - 1)) >> shift)
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+ NGX_SLAB_MAP_SHIFT);
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if (slab & m) {
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if (page->next == NULL) {
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slots = (ngx_slab_page_t *)
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((u_char *) pool + sizeof(ngx_slab_pool_t));
|
|
slot = shift - pool->min_shift;
|
|
|
|
page->next = slots[slot].next;
|
|
slots[slot].next = page;
|
|
|
|
page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_BIG;
|
|
page->next->prev = (uintptr_t) page | NGX_SLAB_BIG;
|
|
}
|
|
|
|
page->slab &= ~m;
|
|
|
|
if (page->slab & NGX_SLAB_MAP_MASK) {
|
|
goto done;
|
|
}
|
|
|
|
ngx_slab_free_pages(pool, page, 1);
|
|
|
|
goto done;
|
|
}
|
|
|
|
goto chunk_already_free;
|
|
|
|
case NGX_SLAB_PAGE:
|
|
|
|
if ((uintptr_t) p & (ngx_pagesize - 1)) {
|
|
goto wrong_chunk;
|
|
}
|
|
|
|
if (slab == NGX_SLAB_PAGE_FREE) {
|
|
ngx_slab_error(pool, NGX_LOG_ALERT,
|
|
"ngx_slab_free(): page is already free");
|
|
goto fail;
|
|
}
|
|
|
|
if (slab == NGX_SLAB_PAGE_BUSY) {
|
|
ngx_slab_error(pool, NGX_LOG_ALERT,
|
|
"ngx_slab_free(): pointer to wrong page");
|
|
goto fail;
|
|
}
|
|
|
|
n = ((u_char *) p - pool->start) >> ngx_pagesize_shift;
|
|
size = slab & ~NGX_SLAB_PAGE_START;
|
|
|
|
ngx_slab_free_pages(pool, &pool->pages[n], size);
|
|
|
|
ngx_slab_junk(p, size << ngx_pagesize_shift);
|
|
|
|
return;
|
|
}
|
|
|
|
/* not reached */
|
|
|
|
return;
|
|
|
|
done:
|
|
|
|
ngx_slab_junk(p, size);
|
|
|
|
return;
|
|
|
|
wrong_chunk:
|
|
|
|
ngx_slab_error(pool, NGX_LOG_ALERT,
|
|
"ngx_slab_free(): pointer to wrong chunk");
|
|
|
|
goto fail;
|
|
|
|
chunk_already_free:
|
|
|
|
ngx_slab_error(pool, NGX_LOG_ALERT,
|
|
"ngx_slab_free(): chunk is already free");
|
|
|
|
fail:
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
static ngx_slab_page_t *
|
|
ngx_slab_alloc_pages(ngx_slab_pool_t *pool, ngx_uint_t pages)
|
|
{
|
|
ngx_slab_page_t *page, *p;
|
|
|
|
for (page = pool->free.next; page != &pool->free; page = page->next) {
|
|
|
|
if (page->slab >= pages) {
|
|
|
|
if (page->slab > pages) {
|
|
page[pages].slab = page->slab - pages;
|
|
page[pages].next = page->next;
|
|
page[pages].prev = page->prev;
|
|
|
|
p = (ngx_slab_page_t *) page->prev;
|
|
p->next = &page[pages];
|
|
page->next->prev = (uintptr_t) &page[pages];
|
|
|
|
} else {
|
|
p = (ngx_slab_page_t *) page->prev;
|
|
p->next = page->next;
|
|
page->next->prev = page->prev;
|
|
}
|
|
|
|
page->slab = pages | NGX_SLAB_PAGE_START;
|
|
page->next = NULL;
|
|
page->prev = NGX_SLAB_PAGE;
|
|
|
|
if (--pages == 0) {
|
|
return page;
|
|
}
|
|
|
|
for (p = page + 1; pages; pages--) {
|
|
p->slab = NGX_SLAB_PAGE_BUSY;
|
|
p->next = NULL;
|
|
p->prev = NGX_SLAB_PAGE;
|
|
p++;
|
|
}
|
|
|
|
return page;
|
|
}
|
|
}
|
|
|
|
ngx_slab_error(pool, NGX_LOG_CRIT, "ngx_slab_alloc() failed: no memory");
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static void
|
|
ngx_slab_free_pages(ngx_slab_pool_t *pool, ngx_slab_page_t *page,
|
|
ngx_uint_t pages)
|
|
{
|
|
ngx_slab_page_t *prev;
|
|
|
|
page->slab = pages--;
|
|
|
|
if (pages) {
|
|
ngx_memzero(&page[1], pages * sizeof(ngx_slab_page_t));
|
|
}
|
|
|
|
if (page->next) {
|
|
prev = (ngx_slab_page_t *) (page->prev & ~NGX_SLAB_PAGE_MASK);
|
|
prev->next = page->next;
|
|
page->next->prev = page->prev;
|
|
}
|
|
|
|
page->prev = (uintptr_t) &pool->free;
|
|
page->next = pool->free.next;
|
|
|
|
page->next->prev = (uintptr_t) page;
|
|
|
|
pool->free.next = page;
|
|
}
|
|
|
|
|
|
static void
|
|
ngx_slab_error(ngx_slab_pool_t *pool, ngx_uint_t level, char *text)
|
|
{
|
|
ngx_log_error(level, ngx_cycle->log, 0, "%s%s", text, pool->log_ctx);
|
|
}
|