Mercurial > hg > nginx-quic
annotate src/core/ngx_atomic.h @ 297:ee394e997c77
nginx-0.0.3-2004-03-29-21:43:58 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Mon, 29 Mar 2004 17:43:58 +0000 |
parents | 0ba4821f4460 |
children | 4a3f18406832 |
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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 old = 1; |
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26 __asm__ volatile ( |
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28 NGX_SMP_LOCK |
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29 " xaddl %0, %1; " |
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31 : "=q" (old) : "m" (*value)); |
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32 |
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33 return old; |
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34 } |
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35 |
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36 |
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37 static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value) |
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38 { |
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39 uint32_t old; |
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41 old = (uint32_t) -1; |
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43 __asm__ volatile ( |
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45 NGX_SMP_LOCK |
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46 " xaddl %0, %1; " |
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48 : "=q" (old) : "m" (*value)); |
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49 |
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50 return old; |
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51 } |
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52 |
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53 |
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54 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, |
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55 ngx_atomic_t old, |
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56 ngx_atomic_t set) |
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57 { |
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58 uint32_t res; |
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60 __asm__ volatile ( |
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62 NGX_SMP_LOCK |
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63 " cmpxchgl %3, %1; " |
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64 " setz %%al; " |
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65 " movzbl %%al, %0; " |
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67 : "+a" (res) : "m" (*lock), "a" (old), "q" (set)); |
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68 |
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69 return res; |
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70 } |
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71 |
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72 #else |
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74 typedef volatile uint32_t ngx_atomic_t; |
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75 |
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76 /* STUB */ |
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77 #define ngx_atomic_inc(x) (*(x))++; |
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78 #define ngx_atomic_dec(x) (*(x))--; |
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79 #define ngx_atomic_cmp_set(lock, old, set) 1; |
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80 /**/ |
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81 |
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82 #endif |
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83 |
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85 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |