Mercurial > hg > nginx
annotate src/core/ngx_atomic.h @ 272:d4e65d74db9f
nginx-0.0.2-2004-03-01-00:03:02 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Sun, 29 Feb 2004 21:03:02 +0000 |
parents | 83205e0b5522 |
children | 0ba4821f4460 |
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 " movl $1, %0; " |
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27 NGX_SMP_LOCK |
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28 " xaddl %0, %1; " |
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29 |
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30 : "=a" (old) : "m" (*value)); |
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31 |
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32 return old; |
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33 } |
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34 |
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35 |
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36 static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value) |
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37 { |
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38 uint32_t old; |
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40 __asm__ volatile ( |
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42 " movl $-1, %0; " |
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43 NGX_SMP_LOCK |
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44 " xaddl %0, %1; " |
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46 : "=a" (old) : "m" (*value)); |
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47 |
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48 return old; |
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49 } |
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51 |
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52 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, |
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53 ngx_atomic_t old, |
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54 ngx_atomic_t set) |
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55 { |
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56 uint32_t res; |
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58 __asm__ volatile ( |
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60 NGX_SMP_LOCK |
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61 " cmpxchgl %3, %1; " |
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62 " setz %%al; " |
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63 " movzbl %%al, %0; " |
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65 : "=a" (res) : "m" (*lock), "a" (old), "q" (set)); |
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66 |
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67 return res; |
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68 } |
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69 |
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70 #else |
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72 typedef volatile uint32_t ngx_atomic_t; |
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73 |
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74 /* STUB */ |
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75 #define ngx_atomic_inc(x) x++; |
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76 #define ngx_atomic_dec(x) x--; |
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77 #define ngx_atomic_cmp_set(lock, old, set) 1; |
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78 /**/ |
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79 |
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80 #endif |
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81 |
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82 |
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83 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |