Mercurial > hg > nginx-vendor-0-8
view src/os/unix/ngx_gcc_atomic_x86.h @ 394:05981f639d21 NGINX_0_7_9
nginx 0.7.9
*) Change: now ngx_http_charset_module works by default with following
MIME types: text/html, text/css, text/xml, text/plain,
text/vnd.wap.wml, application/x-javascript, and application/rss+xml.
*) Feature: the "charset_types" and "addition_types" directives.
*) Feature: now the "gzip_types", "ssi_types", and "sub_filter_types"
directives use hash.
*) Feature: the ngx_cpp_test_module.
*) Feature: the "expires" directive supports daily time.
*) Feature: the ngx_http_xslt_module improvements and bug fixing.
Thanks to Denis F. Latypoff and Maxim Dounin.
*) Bugfix: the "log_not_found" directive did not work for index files
tests.
*) Bugfix: HTTPS connections might hang, if kqueue, epoll, rtsig, or
eventport methods were used; the bug had appeared in 0.7.7.
*) Bugfix: if the "server_name", "valid_referers", and "map" directives
used an "*.domain.tld" wildcard and exact name "domain.tld" was not
set, then the exact name was matched by the wildcard; the bugs had
appeared in 0.3.18.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Tue, 12 Aug 2008 00:00:00 +0400 |
parents | 052a7b1d40e5 |
children | 5c576ea5dbd9 |
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/* * Copyright (C) Igor Sysoev */ #if (NGX_SMP) #define NGX_SMP_LOCK "lock;" #else #define NGX_SMP_LOCK #endif /* * "cmpxchgl r, [m]": * * if (eax == [m]) { * zf = 1; * [m] = r; * } else { * zf = 0; * eax = [m]; * } * * * The "r" means the general register. * The "=a" and "a" are the %eax register. * Although we can return result in any register, we use "a" because it is * used in cmpxchgl anyway. The result is actually in %al but not in %eax, * however, as the code is inlined gcc can test %al as well as %eax, * and icc adds "movzbl %al, %eax" by itself. * * The "cc" means that flags were changed. */ static ngx_inline ngx_atomic_uint_t ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, ngx_atomic_uint_t set) { u_char res; __asm__ volatile ( NGX_SMP_LOCK " cmpxchgl %3, %1; " " sete %0; " : "=a" (res) : "m" (*lock), "a" (old), "r" (set) : "cc", "memory"); return res; } /* * "xaddl r, [m]": * * temp = [m]; * [m] += r; * r = temp; * * * The "+r" means the general register. * The "cc" means that flags were changed. */ #if !(( __GNUC__ == 2 && __GNUC_MINOR__ <= 7 ) || ( __INTEL_COMPILER >= 800 )) /* * icc 8.1 and 9.0 compile broken code with -march=pentium4 option: * ngx_atomic_fetch_add() always return the input "add" value, * so we use the gcc 2.7 version. * * icc 8.1 and 9.0 with -march=pentiumpro option or icc 7.1 compile * correct code. */ static ngx_inline ngx_atomic_int_t ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) { __asm__ volatile ( NGX_SMP_LOCK " xaddl %0, %1; " : "+r" (add) : "m" (*value) : "cc", "memory"); return add; } #else /* * gcc 2.7 does not support "+r", so we have to use the fixed * %eax ("=a" and "a") and this adds two superfluous instructions in the end * of code, something like this: "mov %eax, %edx / mov %edx, %eax". */ static ngx_inline ngx_atomic_int_t ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) { ngx_atomic_uint_t old; __asm__ volatile ( NGX_SMP_LOCK " xaddl %2, %1; " : "=a" (old) : "m" (*value), "a" (add) : "cc", "memory"); return old; } #endif /* * on x86 the write operations go in a program order, so we need only * to disable the gcc reorder optimizations */ #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") /* old as does not support "pause" opcode */ #define ngx_cpu_pause() __asm__ (".byte 0xf3, 0x90")