Mercurial > hg > nginx-quic
view src/os/unix/ngx_atomic.h @ 484:60452f1c0c62
release-0.1.16 tag
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 25 Jan 2005 12:27:35 +0000 |
parents | 42d11f017717 |
children | 975f62e77f02 |
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/* * Copyright (C) Igor Sysoev */ #ifndef _NGX_ATOMIC_H_INCLUDED_ #define _NGX_ATOMIC_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #if ( __i386__ || __amd64__ ) #define NGX_HAVE_ATOMIC_OPS 1 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; __asm__ volatile ( NGX_SMP_LOCK " xaddl %0, %2; " " incl %0; " : "=q" (old) : "0" (1), "m" (*value)); return old; } #if 0 static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value) { uint32_t old; __asm__ volatile ( NGX_SMP_LOCK " xaddl %0, %1; " " decl %0; " : "=q" (old) : "0" (-1), "m" (*value)); return old; } #endif 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; } #elif ( __sparc__ ) #define NGX_HAVE_ATOMIC_OPS 1 typedef volatile uint32_t ngx_atomic_t; static ngx_inline uint32_t ngx_atomic_inc(ngx_atomic_t *value) { uint32_t old, new, res; old = *value; for ( ;; ) { new = old + 1; res = new; __asm__ volatile ( "casa [%1] 0x80, %2, %0" : "+r" (res) : "r" (value), "r" (old)); if (res == old) { return new; } old = res; } } static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_t old, ngx_atomic_t set) { uint32_t res = (uint32_t) set; __asm__ volatile ( "casa [%1] 0x80, %2, %0" : "+r" (res) : "r" (lock), "r" (old)); return (res == old); } #else #define NGX_HAVE_ATOMIC_OPS 0 typedef volatile uint32_t ngx_atomic_t; #define ngx_atomic_inc(x) ++(*(x)); static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_t old, ngx_atomic_t set) { return 1; } #endif void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin); #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) #define ngx_unlock(lock) *(lock) = 0 #endif /* _NGX_ATOMIC_H_INCLUDED_ */