Mercurial > hg > nginx-vendor-current
view src/os/unix/ngx_gcc_atomic_amd64.h @ 372:6639b93e81b2 NGINX_0_6_30
nginx 0.6.30
*) Change: now if an "include" directive pattern does not match any
file, then nginx does not issue an error.
*) Feature: now the time in directives may be specified without spaces,
for example, "1h50m".
*) Bugfix: memory leaks if the "ssl_verify_client" directive was on.
Thanks to Chavelle Vincent.
*) Bugfix: the "sub_filter" directive might set text to change into
output.
*) Bugfix: the "error_page" directive did not take into account
arguments in redirected URI.
*) Bugfix: now nginx always opens files in binary mode under Cygwin.
*) Bugfix: nginx could not be built on OpenBSD; bug appeared in 0.6.15.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Tue, 29 Apr 2008 00:00:00 +0400 |
parents | 052a7b1d40e5 |
children | d0f7a625f27c |
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/* * Copyright (C) Igor Sysoev */ #if (NGX_SMP) #define NGX_SMP_LOCK "lock;" #else #define NGX_SMP_LOCK #endif /* * "cmpxchgq r, [m]": * * if (rax == [m]) { * zf = 1; * [m] = r; * } else { * zf = 0; * rax = [m]; * } * * * The "r" is any register, %rax (%r0) - %r16. * The "=a" and "a" are the %rax register. * Although we can return result in any register, we use "a" because it is * used in cmpxchgq anyway. The result is actually in %al but not in $rax, * however as the code is inlined gcc can test %al as well as %rax. * * 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 " cmpxchgq %3, %1; " " sete %0; " : "=a" (res) : "m" (*lock), "a" (old), "r" (set) : "cc", "memory"); return res; } /* * "xaddq r, [m]": * * temp = [m]; * [m] += r; * r = temp; * * * The "+r" is any register, %rax (%r0) - %r16. * The "cc" means that flags were changed. */ 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 " xaddq %0, %1; " : "+r" (add) : "m" (*value) : "cc", "memory"); return add; } #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") #define ngx_cpu_pause() __asm__ ("pause")