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561
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #if (NGX_PTR_SIZE == 4)
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8 #define NGX_CASA ngx_casa
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9 #else
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10 #define NGX_CASA ngx_casxa
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11 #endif
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12
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13
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14 ngx_atomic_uint_t
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15 ngx_casa(ngx_atomic_uint_t set, ngx_atomic_uint_t old, ngx_atomic_t *lock);
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16
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17 ngx_atomic_uint_t
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18 ngx_casxa(ngx_atomic_uint_t set, ngx_atomic_uint_t old, ngx_atomic_t *lock);
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19
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20 /* the code in src/os/unix/ngx_sunpro_sparc64.il */
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21
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22
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23 static ngx_inline ngx_atomic_uint_t
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24 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
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25 ngx_atomic_uint_t set)
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26 {
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27 NGX_CASA(set, old, lock);
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28
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29 return (set == old);
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30 }
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31
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32
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33 static ngx_inline ngx_atomic_int_t
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34 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
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35 {
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36 ngx_atomic_uint_t old, res;
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37
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38 old = *value;
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39
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40 for ( ;; ) {
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41
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42 res = old + add;
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43
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44 NGX_CASA(res, old, value);
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45
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46 if (res == old) {
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47 return res;
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48 }
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49
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50 old = res;
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51 }
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52 }
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