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#ifndef _NGX_ATOMIC_H_INCLUDED_
#define _NGX_ATOMIC_H_INCLUDED_
#include <ngx_config.h>
#include <ngx_core.h>
#ifdef __i386__
typedef 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 ("
movl $1, %0
" NGX_SMP_LOCK
" xaddl %0, %1
": "=a" (old) : "m" (*value));
return old;
}
static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value)
{
uint32_t old;
__asm__ __volatile ("
movl $-1, %0
" NGX_SMP_LOCK
" xaddl %0, %1
": "=a" (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
setzb %%al
movzbl %%al, %0
": "=a" (res) : "m" (*lock), "a" (old), "q" (set));
return res;
}
#else
typedef 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_ */
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