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view src/os/unix/ngx_atomic.h @ 379:73688d5d7fc3
nginx-0.0.7-2004-07-06-20:12:16 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 06 Jul 2004 16:12:16 +0000 |
parents | 018569a8f09c |
children | bd39260a1383 |
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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; __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_ */