mirror of
https://github.com/nginx/nginx.git
synced 2025-01-10 03:58:28 +08:00
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
|
|
/*
|
|
* Copyright (C) Igor Sysoev
|
|
* Copyright (C) Nginx, Inc.
|
|
*/
|
|
|
|
|
|
#if (NGX_PTR_SIZE == 4)
|
|
#define NGX_CASA ngx_casa
|
|
#else
|
|
#define NGX_CASA ngx_casxa
|
|
#endif
|
|
|
|
|
|
ngx_atomic_uint_t
|
|
ngx_casa(ngx_atomic_uint_t set, ngx_atomic_uint_t old, ngx_atomic_t *lock);
|
|
|
|
ngx_atomic_uint_t
|
|
ngx_casxa(ngx_atomic_uint_t set, ngx_atomic_uint_t old, ngx_atomic_t *lock);
|
|
|
|
/* the code in src/os/unix/ngx_sunpro_sparc64.il */
|
|
|
|
|
|
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)
|
|
{
|
|
set = NGX_CASA(set, old, lock);
|
|
|
|
return (set == old);
|
|
}
|
|
|
|
|
|
static ngx_inline ngx_atomic_int_t
|
|
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
|
|
{
|
|
ngx_atomic_uint_t old, res;
|
|
|
|
old = *value;
|
|
|
|
for ( ;; ) {
|
|
|
|
res = old + add;
|
|
|
|
res = NGX_CASA(res, old, value);
|
|
|
|
if (res == old) {
|
|
return res;
|
|
}
|
|
|
|
old = res;
|
|
}
|
|
}
|
|
|
|
|
|
#define ngx_memory_barrier() \
|
|
__asm (".volatile"); \
|
|
__asm ("membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad"); \
|
|
__asm (".nonvolatile")
|
|
|
|
#define ngx_cpu_pause()
|