Mercurial > hg > nginx
annotate src/os/unix/ngx_gcc_atomic_sparc64.h @ 7660:d33e17499088
Version bump.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Tue, 26 May 2020 22:03:00 +0300 |
| parents | 67653855682e |
| children |
| rev | line source |
|---|---|
| 561 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 561 | 5 */ |
| 6 | |
| 7 | |
| 8 /* | |
| 9 * "casa [r1] 0x80, r2, r0" and | |
| 10 * "casxa [r1] 0x80, r2, r0" do the following: | |
| 11 * | |
| 12 * if ([r1] == r2) { | |
| 13 * swap(r0, [r1]); | |
| 14 * } else { | |
| 15 * r0 = [r1]; | |
| 16 * } | |
| 17 * | |
|
4572
67653855682e
Fixed spelling in multiline C comments.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
|
18 * so "r0 == r2" means that the operation was successful. |
| 561 | 19 * |
| 20 * | |
| 21 * The "r" means the general register. | |
| 22 * The "+r" means the general register used for both input and output. | |
| 23 */ | |
| 24 | |
| 25 | |
| 26 #if (NGX_PTR_SIZE == 4) | |
| 27 #define NGX_CASA "casa" | |
| 28 #else | |
| 29 #define NGX_CASA "casxa" | |
| 30 #endif | |
| 31 | |
| 32 | |
| 33 static ngx_inline ngx_atomic_uint_t | |
| 34 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
| 35 ngx_atomic_uint_t set) | |
| 36 { | |
| 37 __asm__ volatile ( | |
| 38 | |
| 39 NGX_CASA " [%1] 0x80, %2, %0" | |
| 40 | |
| 41 : "+r" (set) : "r" (lock), "r" (old) : "memory"); | |
| 42 | |
| 43 return (set == old); | |
| 577 | 44 } |
| 561 | 45 |
| 46 | |
| 47 static ngx_inline ngx_atomic_int_t | |
| 48 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
| 49 { | |
| 50 ngx_atomic_uint_t old, res; | |
| 51 | |
| 52 old = *value; | |
| 53 | |
| 54 for ( ;; ) { | |
| 55 | |
| 56 res = old + add; | |
| 57 | |
| 58 __asm__ volatile ( | |
| 59 | |
| 60 NGX_CASA " [%1] 0x80, %2, %0" | |
| 61 | |
| 62 : "+r" (res) : "r" (value), "r" (old) : "memory"); | |
| 63 | |
| 64 if (res == old) { | |
| 65 return res; | |
| 66 } | |
| 67 | |
| 68 old = res; | |
| 69 } | |
| 70 } | |
| 563 | 71 |
| 72 | |
| 73 #if (NGX_SMP) | |
| 74 #define ngx_memory_barrier() \ | |
| 75 __asm__ volatile ( \ | |
| 76 "membar #LoadLoad | #LoadStore | #StoreStore | #StoreLoad" \ | |
| 77 ::: "memory") | |
| 78 #else | |
| 79 #define ngx_memory_barrier() __asm__ volatile ("" ::: "memory") | |
| 80 #endif | |
| 611 | 81 |
| 82 #define ngx_cpu_pause() |