Mercurial > hg > nginx-quic
view src/core/ngx_atomic.h @ 297:ee394e997c77
nginx-0.0.3-2004-03-29-21:43:58 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Mon, 29 Mar 2004 17:43:58 +0000 |
parents | 0ba4821f4460 |
children | 4a3f18406832 |
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#ifndef _NGX_ATOMIC_H_INCLUDED_ #define _NGX_ATOMIC_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #if ( __i386__ || __amd64__ ) typedef volatile uint32_t ngx_atomic_t; #if (NGX_SMP) #define NGX_SMP_LOCK "lock" #else #define NGX_SMP_LOCK #endif static ngx_inline uint32_t ngx_atomic_inc(ngx_atomic_t *value) { uint32_t old; old = 1; __asm__ volatile ( NGX_SMP_LOCK " xaddl %0, %1; " : "=q" (old) : "m" (*value)); return old; } static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value) { uint32_t old; old = (uint32_t) -1; __asm__ volatile ( NGX_SMP_LOCK " xaddl %0, %1; " : "=q" (old) : "m" (*value)); return old; } static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_t old, ngx_atomic_t set) { uint32_t res; __asm__ volatile ( NGX_SMP_LOCK " cmpxchgl %3, %1; " " setz %%al; " " movzbl %%al, %0; " : "+a" (res) : "m" (*lock), "a" (old), "q" (set)); return res; } #else typedef volatile uint32_t ngx_atomic_t; /* STUB */ #define ngx_atomic_inc(x) (*(x))++; #define ngx_atomic_dec(x) (*(x))--; #define ngx_atomic_cmp_set(lock, old, set) 1; /**/ #endif #endif /* _NGX_ATOMIC_H_INCLUDED_ */