annotate src/core/ngx_spinlock.c @ 28:7ca9bdc82b3f NGINX_0_1_14

nginx 0.1.14 *) Feature: the autoconfiguration directives: --http-client-body-temp-path=PATH, --http-proxy-temp-path=PATH, and --http-fastcgi-temp-path=PATH *) Change: the directory name for the temporary files with the client request body is specified by directive client_body_temp_path, by default it is <prefix>/client_body_temp. *) Feature: the ngx_http_fastcgi_module and the directives: fastcgi_pass, fastcgi_root, fastcgi_index, fastcgi_params, fastcgi_connect_timeout, fastcgi_send_timeout, fastcgi_read_timeout, fastcgi_send_lowat, fastcgi_header_buffer_size, fastcgi_buffers, fastcgi_busy_buffers_size, fastcgi_temp_path, fastcgi_max_temp_file_size, fastcgi_temp_file_write_size, fastcgi_next_upstream, and fastcgi_x_powered_by. *) Bugfix: the "[alert] zero size buf" error; bug appeared in 0.1.3. *) Change: the URI must be specified after the host name in the proxy_pass directive. *) Change: the %3F symbol in the URI was considered as the argument string start. *) Feature: the unix domain sockets support in the ngx_http_proxy_module. *) Feature: the ssl_engine and ssl_ciphers directives. Thanks to Sergey Skvortsov for SSL-accelerator.
author Igor Sysoev <http://sysoev.ru>
date Tue, 18 Jan 2005 00:00:00 +0300
parents f0b350454894
children 41ccba1aba45
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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11 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
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12 {
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14 #if (NGX_HAVE_ATOMIC_OPS)
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16 ngx_uint_t tries;
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18 tries = 0;
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20 for ( ;; ) {
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22 if (*lock) {
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23 if (ngx_ncpu > 1 && tries++ < spin) {
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24 continue;
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25 }
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27 ngx_sched_yield();
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29 tries = 0;
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31 } else {
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32 if (ngx_atomic_cmp_set(lock, 0, 1)) {
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33 return;
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34 }
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35 }
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36 }
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38 #else
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39
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40 #if (NGX_THREADS)
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42 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !
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44 #endif
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46 #endif
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48 }