Mercurial > hg > nginx
annotate src/core/ngx_atomic.h @ 300:502b03d9d2a3
nginx-0.0.3-2004-03-31-00:31:58 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 30 Mar 2004 20:31:58 +0000 |
parents | 46b7eeb8a116 |
children | 744965ec6275 |
rev | line source |
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1 #ifndef _NGX_ATOMIC_H_INCLUDED_ |
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2 #define _NGX_ATOMIC_H_INCLUDED_ |
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3 |
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4 |
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5 #include <ngx_config.h> |
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6 #include <ngx_core.h> |
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7 |
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9 #if ( __i386__ || __amd64__ ) |
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11 typedef volatile uint32_t ngx_atomic_t; |
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12 |
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13 #if (NGX_SMP) |
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14 #define NGX_SMP_LOCK "lock;" |
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15 #else |
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16 #define NGX_SMP_LOCK |
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17 #endif |
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18 |
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19 |
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20 static ngx_inline uint32_t ngx_atomic_inc(ngx_atomic_t *value) |
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21 { |
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22 uint32_t old; |
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24 __asm__ volatile ( |
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26 NGX_SMP_LOCK |
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27 " xaddl %0, %2; " |
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28 |
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29 : "=q" (old) : "0" (1), "m" (*value)); |
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30 |
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31 return old; |
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32 } |
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33 |
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34 |
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35 static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value) |
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36 { |
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37 uint32_t old; |
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38 |
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39 __asm__ volatile ( |
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41 NGX_SMP_LOCK |
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42 " xaddl %0, %1; " |
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44 : "=q" (old) : "0" (-1), "m" (*value)); |
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45 |
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46 return old; |
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47 } |
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48 |
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49 |
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50 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, |
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51 ngx_atomic_t old, |
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52 ngx_atomic_t set) |
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53 { |
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54 uint32_t res; |
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56 __asm__ volatile ( |
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58 NGX_SMP_LOCK |
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59 " cmpxchgl %3, %1; " |
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60 " setz %%al; " |
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61 " movzbl %%al, %0; " |
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63 : "=a" (res) : "m" (*lock), "a" (old), "q" (set)); |
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64 |
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65 return res; |
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66 } |
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67 |
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68 #else |
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70 typedef volatile uint32_t ngx_atomic_t; |
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71 |
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72 /* STUB */ |
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73 #define ngx_atomic_inc(x) (*(x))++; |
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74 #define ngx_atomic_dec(x) (*(x))--; |
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75 #define ngx_atomic_cmp_set(lock, old, set) 1; |
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76 /**/ |
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77 |
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78 #endif |
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81 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |