Mercurial > hg > nginx
diff src/os/unix/ngx_atomic.h @ 373:018569a8f09c
nginx-0.0.7-2004-06-30-19:30:41 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 30 Jun 2004 15:30:41 +0000 |
parents | src/core/ngx_atomic.h@780e93985b93 |
children | bd39260a1383 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os/unix/ngx_atomic.h Wed Jun 30 15:30:41 2004 +0000 @@ -0,0 +1,90 @@ +#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; + + __asm__ volatile ( + + NGX_SMP_LOCK + " xaddl %0, %2; " + " incl %0; " + + : "=q" (old) : "0" (1), "m" (*value)); + + return old; +} + + +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; +} + + +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 + + +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_ */