annotate src/os/unix/ngx_gcc_atomic_amd64.h @ 506:b9fdcaf2062b NGINX_0_7_65

nginx 0.7.65 *) Security: now nginx/Windows ignores trailing spaces in URI. Thanks to Dan Crowley, Core Security Technologies. *) Security: now nginx/Windows ignores short files names. Thanks to Dan Crowley, Core Security Technologies. *) Change: now the "009" status code is written to an access log for proxied HTTP/0.9 responses. *) Change: now the default buffer size of the "large_client_header_buffers" directive is 8K. Thanks to Andrew Cholakian. *) Change: now default SSL ciphers are "HIGH:!ADH:!MD5". *) Change: now SSLv2 protocol is disabled by default. *) Change: now $host variable value is always low case. *) Feature: the conf/fastcgi.conf for simple FastCGI configurations. *) Feature: now URI part is not required a "proxy_pass" directive if variables are used. *) Feature: the $ssl_session_id variable. *) Bugfix: if a proxied or FastCGI request was internally redirected to another proxied or FastCGI location, then $upstream_response_time variable may have abnormally large value; the bug had appeared in 0.7.63. *) Bugfix: if the "expires modified" set date in the past, then a negative number was set in the "Cache-Control" response header line. Thanks to Alex Kapranoff. *) Bugfix: nginx closed a connection if a cached response had an empty body. Thanks to Piotr Sikora. *) Bugfix: nginx cached a 304 response if there was the "If-None-Match" header line in a proxied request. Thanks to Tim Dettrick and David Kostal. *) Bugfix: nginx did not treat a comma as separator in the "Cache-Control" backend response header line. *) Bugfix: cached HTTP/0.9 responses were handled incorrectly. *) Bugfix: nginx sent gzipped responses to clients those do not support gzip, if "gzip_static on" and "gzip_vary off"; the bug had appeared in 0.8.16. *) Bugfix: nginx always added "Content-Encoding: gzip" response header line in 304 responses sent by ngx_http_gzip_static_module. *) Bugfix: the "!-x" operator did not work. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault might occur in a worker process, if limit_rate was used in HTTPS server. Thanks to Maxim Dounin. *) Bugfix: a segmentation fault might occur in a worker process while $limit_rate logging. Thanks to Maxim Dounin. *) Bugfix: nginx did not support dates in 2038 year on 32-bit platforms; *) Bugfix: nginx/Windows tried to delete a temporary file twice if the file should replace an already existent file. *) Bugfix: nginx/Windows tried to rename a temporary file twice if the file should replace an already existent file. *) Bugfix: nginx/Windows might not create temporary file, a cache file, or "proxy/fastcgi_store"d file if a worker had no enough access rights for top level directories. *) Bugfix: in UTF-8 encoding support by "try_files" directive in nginx/Windows. *) Bugfix: UTF-8 encoding usage in the ngx_http_autoindex_module. Thanks to Maxim Dounin. *) Bugfix: the ngx_http_autoindex_module did not show the trailing slash in links to a directory; the bug had appeared in 0.7.15. *) Bugfix: nginx did not close a log file set by the --error-log-path configuration option; the bug had appeared in 0.7.53. *) Bugfix: "addition_types" directive was incorrectly named "addtion_types". *) Bugfix: invalid request line in $request variable was written in access_log only if error_log was set to "info" or "debug" level.
author Igor Sysoev <http://sysoev.ru>
date Mon, 01 Feb 2010 00:00:00 +0000
parents 052a7b1d40e5
children
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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7 #if (NGX_SMP)
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8 #define NGX_SMP_LOCK "lock;"
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9 #else
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10 #define NGX_SMP_LOCK
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11 #endif
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12
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14 /*
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15 * "cmpxchgq r, [m]":
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16 *
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17 * if (rax == [m]) {
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18 * zf = 1;
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19 * [m] = r;
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20 * } else {
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21 * zf = 0;
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22 * rax = [m];
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23 * }
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24 *
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25 *
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26 * The "r" is any register, %rax (%r0) - %r16.
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27 * The "=a" and "a" are the %rax register.
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28 * Although we can return result in any register, we use "a" because it is
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29 * used in cmpxchgq anyway. The result is actually in %al but not in $rax,
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30 * however as the code is inlined gcc can test %al as well as %rax.
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31 *
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32 * The "cc" means that flags were changed.
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33 */
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34
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35 static ngx_inline ngx_atomic_uint_t
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36 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
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37 ngx_atomic_uint_t set)
126
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38 {
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39 u_char res;
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40
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41 __asm__ volatile (
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42
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43 NGX_SMP_LOCK
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44 " cmpxchgq %3, %1; "
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45 " sete %0; "
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47 : "=a" (res) : "m" (*lock), "a" (old), "r" (set) : "cc", "memory");
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48
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49 return res;
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50 }
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53 /*
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54 * "xaddq r, [m]":
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55 *
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56 * temp = [m];
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57 * [m] += r;
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58 * r = temp;
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59 *
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60 *
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61 * The "+r" is any register, %rax (%r0) - %r16.
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62 * The "cc" means that flags were changed.
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63 */
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64
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65 static ngx_inline ngx_atomic_int_t
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66 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
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67 {
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68 __asm__ volatile (
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69
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70 NGX_SMP_LOCK
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71 " xaddq %0, %1; "
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72
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73 : "+r" (add) : "m" (*value) : "cc", "memory");
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75 return add;
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76 }
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79 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory")
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80
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81 #define ngx_cpu_pause() __asm__ ("pause")