2004-05-28 23:49:23 +08:00
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2004-09-28 16:34:51 +08:00
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/*
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2004-09-30 00:00:49 +08:00
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* Copyright (C) Igor Sysoev
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2004-09-28 16:34:51 +08:00
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*/
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2004-05-28 23:49:23 +08:00
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#include <ngx_config.h>
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#include <ngx_core.h>
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2005-03-04 22:06:57 +08:00
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ngx_buf_t *
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ngx_create_temp_buf(ngx_pool_t *pool, size_t size)
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2004-05-28 23:49:23 +08:00
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{
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ngx_buf_t *b;
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if (!(b = ngx_calloc_buf(pool))) {
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return NULL;
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}
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if (!(b->start = ngx_palloc(pool, size))) {
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return NULL;
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}
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2005-03-04 22:06:57 +08:00
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/*
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* set by ngx_calloc_buf():
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*
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* b->file_pos = 0;
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* b->file_last = 0;
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* b->file = NULL;
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* b->shadow = NULL;
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* b->tag = 0;
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*
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*/
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2004-05-28 23:49:23 +08:00
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b->pos = b->start;
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b->last = b->start;
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b->end = b->last + size;
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b->temporary = 1;
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return b;
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}
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2005-03-04 22:06:57 +08:00
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ngx_chain_t *
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ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs)
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2004-05-28 23:49:23 +08:00
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{
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u_char *p;
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ngx_int_t i;
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ngx_buf_t *b;
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ngx_chain_t *chain, *cl, **ll;
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if (!(p = ngx_palloc(pool, bufs->num * bufs->size))) {
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return NULL;
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}
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ll = &chain;
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for (i = 0; i < bufs->num; i++) {
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if (!(b = ngx_calloc_buf(pool))) {
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return NULL;
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}
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2005-03-04 22:06:57 +08:00
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/*
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* set by ngx_calloc_buf():
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*
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* b->file_pos = 0;
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* b->file_last = 0;
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* b->file = NULL;
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* b->shadow = NULL;
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* b->tag = 0;
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*
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*/
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2004-05-28 23:49:23 +08:00
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b->pos = p;
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b->last = p;
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b->temporary = 1;
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b->start = p;
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p += bufs->size;
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b->end = p;
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if (!(cl = ngx_alloc_chain_link(pool))) {
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return NULL;
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}
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cl->buf = b;
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*ll = cl;
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ll = &cl->next;
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}
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*ll = NULL;
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return chain;
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}
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2005-03-04 22:06:57 +08:00
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ngx_int_t
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ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in)
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2004-05-28 23:49:23 +08:00
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{
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ngx_chain_t *cl, **ll;
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ll = chain;
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for (cl = *chain; cl; cl = cl->next) {
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ll = &cl->next;
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}
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while (in) {
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ngx_test_null(cl, ngx_alloc_chain_link(pool), NGX_ERROR);
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cl->buf = in->buf;
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*ll = cl;
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ll = &cl->next;
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in = in->next;
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}
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*ll = NULL;
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return NGX_OK;
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}
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2005-03-04 22:06:57 +08:00
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void
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ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
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ngx_chain_t **out, ngx_buf_tag_t tag)
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2004-05-28 23:49:23 +08:00
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{
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2005-03-04 22:06:57 +08:00
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ngx_chain_t *cl;
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2004-05-28 23:49:23 +08:00
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if (*busy == NULL) {
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*busy = *out;
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} else {
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2005-03-04 22:06:57 +08:00
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for (cl = *busy; cl->next; cl = cl->next) { /* void */ }
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2004-10-21 23:34:38 +08:00
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2005-03-04 22:06:57 +08:00
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cl->next = *out;
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2004-05-28 23:49:23 +08:00
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}
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*out = NULL;
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while (*busy) {
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if (ngx_buf_size((*busy)->buf) != 0) {
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break;
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}
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2004-11-26 00:17:31 +08:00
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#if (NGX_HAVE_WRITE_ZEROCOPY)
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2004-05-28 23:49:23 +08:00
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if ((*busy)->buf->zerocopy_busy) {
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break;
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}
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#endif
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if ((*busy)->buf->tag != tag) {
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*busy = (*busy)->next;
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continue;
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}
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2004-10-11 23:07:03 +08:00
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(*busy)->buf->pos = (*busy)->buf->start;
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(*busy)->buf->last = (*busy)->buf->start;
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2004-05-28 23:49:23 +08:00
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2005-03-04 22:06:57 +08:00
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cl = *busy;
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*busy = cl->next;
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cl->next = *free;
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*free = cl;
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2004-05-28 23:49:23 +08:00
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}
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}
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