Mercurial > hg > nginx-vendor-0-5
view src/os/unix/ngx_gcc_atomic_x86.h @ 258:6ae1357b7b7c NGINX_0_4_14
nginx 0.4.14
*) Feature: the "proxy_pass_error_message" directive in IMAP/POP3 proxy.
*) Feature: now configure detects system PCRE library on FreeBSD,
Linux, and NetBSD.
*) Bugfix: ngx_http_perl_module did not work with perl built with the
threads support; bug appeared in 0.3.38.
*) Bugfix: ngx_http_perl_module did not work if perl was called
recursively.
*) Bugfix: nginx ignored a host name in an request line.
*) Bugfix: a worker process may got caught in an endless loop, if a
FastCGI server sent too many data to the stderr.
*) Bugfix: the $upstream_response_time variable may be negative if the
system time was changed backward.
*) Bugfix: the "Auth-Login-Attempt" parameter was not sent to IMAP/POP3
proxy authentication server when POP3 was used.
*) Bugfix: a segmentation fault might occur if connect to IMAP/POP3
proxy authentication server failed.
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Mon, 27 Nov 2006 00:00:00 +0300 |
parents | 73e8476f9142 |
children | 052a7b1d40e5 |
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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 "q" is any of the %eax, %ebx, %ecx, or %edx registers. * The "=a" and "a" are the %eax register. Although we can return result * in any register, we use %eax because it is used in cmpxchgl anyway. * 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) { ngx_atomic_uint_t res; __asm__ volatile ( NGX_SMP_LOCK " cmpxchgl %3, %1; " " setz %b0; " " movzbl %b0, %0; " : "=a" (res) : "m" (*lock), "a" (old), "q" (set) : "cc", "memory"); return res; } /* * "xaddl r, [m]": * * temp = [m]; * [m] += r; * r = temp; * * * The "+q" is any of the %eax, %ebx, %ecx, or %edx registers. * 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; " : "+q" (add) : "m" (*value) : "cc", "memory"); return add; } #else /* * gcc 2.7 does not support "+q", 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")