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annotate src/core/ngx_atomic.h @ 302:1526e7686b20

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nginx-0.0.3-2004-04-01-10:21:13 import
author Igor Sysoev <igor@sysoev.ru>
date Thu, 01 Apr 2004 06:21:13 +0000
parents 744965ec6275
children 54f76b0b8dca
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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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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 __asm__ volatile (
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26 NGX_SMP_LOCK
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27 " xaddl %0, %2; "
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28 " incl %0; "
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30 : "=q" (old) : "0" (1), "m" (*value));
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31
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32 return old;
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33 }
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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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39
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40 __asm__ volatile (
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42 NGX_SMP_LOCK
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43 " xaddl %0, %1; "
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44 " decl %0; "
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46 : "=q" (old) : "0" (-1), "m" (*value));
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47
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48 return old;
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49 }
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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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57
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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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64
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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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71 #elif (WIN32)
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72
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73 #define ngx_atomic_inc(p) InterlockedIncrement((long *) p)
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74 #define ngx_atomic_dec(p) InterlockedDecrement((long *) p)
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75 /* STUB */
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76 #define ngx_atomic_cmp_set(lock, old, set) 1
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77 #if 0
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78 #define ngx_atomic_cmp_set(lock, old, set) \
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79 InterlockedCompareExchange(lock, set, old)
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80 #endif
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82
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83 #else
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84
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85 typedef volatile uint32_t ngx_atomic_t;
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86
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87 /* STUB */
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88 #define ngx_atomic_inc(x) (*(x))++;
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89 #define ngx_atomic_dec(x) (*(x))--;
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90 #define ngx_atomic_cmp_set(lock, old, set) 1
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91 /**/
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92
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93 #endif
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96 #endif /* _NGX_ATOMIC_H_INCLUDED_ */