This source file includes following definitions.
- ngx_atomic_cmp_set
- ngx_atomic_fetch_add
#if (NGX_SMP)
#define NGX_SMP_LOCK "lock;"
#else
#define NGX_SMP_LOCK
#endif
static ngx_inline ngx_atomic_uint_t
ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
ngx_atomic_uint_t set)
{
u_char res;
__asm__ volatile (
NGX_SMP_LOCK
" cmpxchgq %3, %1; "
" sete %0; "
: "=a" (res) : "m" (*lock), "a" (old), "r" (set) : "cc", "memory");
return res;
}
static ngx_inline ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
{
__asm__ volatile (
NGX_SMP_LOCK
" xaddq %0, %1; "
: "+r" (add) : "m" (*value) : "cc", "memory");
return add;
}
#define ngx_memory_barrier() __asm__ volatile ("" ::: "memory")
#define ngx_cpu_pause() __asm__ ("pause")