Mercurial > hg > nginx
annotate src/core/ngx_array.h @ 7142:b9d919b53593 stable-1.12
Stream: relaxed next upstream condition (ticket #1317).
When switching to a next upstream, some buffers could be stuck in the middle
of the filter chain. A condition existed that raised an error when this
happened. As it turned out, this condition prevented switching to a next
upstream if ssl preread was used with the TCP protocol (see the ticket).
In fact, the condition does not make sense for TCP, since after successful
connection to an upstream switching to another upstream never happens. As for
UDP, the issue with stuck buffers is unlikely to happen, but is still possible.
Specifically, if a filter delays sending data to upstream.
The condition can be relaxed to only check the "buffered" bitmask of the
upstream connection. The new condition is simpler and fixes the ticket issue
as well. Additionally, the upstream_out chain is now reset for UDP prior to
connecting to a new upstream to prevent repeating the client data twice.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Mon, 11 Sep 2017 15:32:31 +0300 |
parents | 65b895cd0dfa |
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rev | line source |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #ifndef _NGX_ARRAY_H_INCLUDED_ |
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9 #define _NGX_ARRAY_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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16 typedef struct { |
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17 void *elts; |
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18 ngx_uint_t nelts; |
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19 size_t size; |
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20 ngx_uint_t nalloc; |
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21 ngx_pool_t *pool; |
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22 } ngx_array_t; |
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485 | 25 ngx_array_t *ngx_array_create(ngx_pool_t *p, ngx_uint_t n, size_t size); |
26 void ngx_array_destroy(ngx_array_t *a); | |
27 void *ngx_array_push(ngx_array_t *a); | |
28 void *ngx_array_push_n(ngx_array_t *a, ngx_uint_t n); | |
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501 | 31 static ngx_inline ngx_int_t |
32 ngx_array_init(ngx_array_t *array, ngx_pool_t *pool, ngx_uint_t n, size_t size) | |
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33 { |
509 | 34 /* |
35 * set "array->nelts" before "array->elts", otherwise MSVC thinks | |
36 * that "array->nelts" may be used without having been initialized | |
37 */ | |
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38 |
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39 array->nelts = 0; |
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40 array->size = size; |
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41 array->nalloc = n; |
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42 array->pool = pool; |
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43 |
509 | 44 array->elts = ngx_palloc(pool, n * size); |
45 if (array->elts == NULL) { | |
46 return NGX_ERROR; | |
47 } | |
48 | |
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49 return NGX_OK; |
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50 } |
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53 #endif /* _NGX_ARRAY_H_INCLUDED_ */ |