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annotate src/core/ngx_atomic.h @ 299:46b7eeb8a116

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nginx-0.0.3-2004-03-30-19:59:50 import
author Igor Sysoev <igor@sysoev.ru>
date Tue, 30 Mar 2004 15:59:50 +0000
parents 4a3f18406832
children 502b03d9d2a3
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679f60139863 nginx-0.0.1-2003-12-19-11:15:11 import
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1 #ifndef _NGX_ATOMIC_H_INCLUDED_
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2 #define _NGX_ATOMIC_H_INCLUDED_
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679f60139863 nginx-0.0.1-2003-12-19-11:15:11 import
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5 #include <ngx_config.h>
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6 #include <ngx_core.h>
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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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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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25
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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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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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42
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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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47
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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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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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59
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60 __asm__ volatile (
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62 NGX_SMP_LOCK
83205e0b5522 nginx-0.0.2-2004-02-24-20:31:46 import
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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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66
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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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73
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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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85 #endif /* _NGX_ATOMIC_H_INCLUDED_ */