1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #if (NGX_PTR_SIZE == 4)
9 #define NGX_CASA ngx_casa
10 #else
11 #define NGX_CASA ngx_casxa
12 #endif
13
14
15 ngx_atomic_uint_t
16 ngx_casa(ngx_atomic_uint_t set, ngx_atomic_uint_t old, ngx_atomic_t *lock);
17
18 ngx_atomic_uint_t
19 ngx_casxa(ngx_atomic_uint_t set, ngx_atomic_uint_t old, ngx_atomic_t *lock);
20
21 /* the code in src/os/unix/ngx_sunpro_sparc64.il */
22
23
24 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)25 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
26 ngx_atomic_uint_t set)
27 {
28 set = NGX_CASA(set, old, lock);
29
30 return (set == old);
31 }
32
33
34 static ngx_inline ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t * value,ngx_atomic_int_t add)35 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
36 {
37 ngx_atomic_uint_t old, res;
38
39 old = *value;
40
41 for ( ;; ) {
42
43 res = old + add;
44
45 res = NGX_CASA(res, old, value);
46
47 if (res == old) {
48 return res;
49 }
50
51 old = res;
52 }
53 }
54
55
56 #define ngx_memory_barrier() \
57 __asm (".volatile"); \
58 __asm ("membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad"); \
59 __asm (".nonvolatile")
60
61 #define ngx_cpu_pause()
62