Mercurial > hg > nginx-vendor-0-8
diff src/os/unix/ngx_atomic.h @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 41ccba1aba45 |
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new file mode 100644 --- /dev/null +++ b/src/os/unix/ngx_atomic.h @@ -0,0 +1,155 @@ + +/* + * 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_ */