Mercurial > hg > nginx
annotate src/os/unix/ngx_atomic.h @ 435:5cdc4838d4e8
nginx-0.0.11-2004-09-22-20:18:21 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 22 Sep 2004 16:18:21 +0000 |
parents | 9a97dcdd2421 |
children | da8c5707af39 |
rev | line source |
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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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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 #define NGX_HAVE_ATOMIC_OPS 1 |
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13 typedef volatile uint32_t ngx_atomic_t; |
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14 |
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15 #if (NGX_SMP) |
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16 #define NGX_SMP_LOCK "lock;" |
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17 #else |
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18 #define NGX_SMP_LOCK |
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19 #endif |
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20 |
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21 |
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22 static ngx_inline uint32_t ngx_atomic_inc(ngx_atomic_t *value) |
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23 { |
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24 uint32_t old; |
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25 |
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26 __asm__ volatile ( |
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27 |
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28 NGX_SMP_LOCK |
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29 " xaddl %0, %2; " |
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30 " incl %0; " |
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31 |
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32 : "=q" (old) : "0" (1), "m" (*value)); |
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33 |
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34 return old; |
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35 } |
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36 |
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37 |
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38 #if 0 |
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39 |
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40 static ngx_inline uint32_t ngx_atomic_dec(ngx_atomic_t *value) |
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41 { |
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42 uint32_t old; |
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43 |
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44 __asm__ volatile ( |
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45 |
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46 NGX_SMP_LOCK |
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47 " xaddl %0, %1; " |
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48 " decl %0; " |
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49 |
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50 : "=q" (old) : "0" (-1), "m" (*value)); |
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51 |
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52 return old; |
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53 } |
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54 |
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55 #endif |
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56 |
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57 |
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58 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, |
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59 ngx_atomic_t old, |
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60 ngx_atomic_t set) |
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61 { |
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62 uint32_t res; |
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63 |
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64 __asm__ volatile ( |
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65 |
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66 NGX_SMP_LOCK |
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67 " cmpxchgl %3, %1; " |
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68 " setz %%al; " |
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69 " movzbl %%al, %0; " |
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70 |
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71 : "=a" (res) : "m" (*lock), "a" (old), "q" (set)); |
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72 |
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73 return res; |
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74 } |
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75 |
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76 |
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77 #elif ( __sparc__ ) |
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78 |
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79 #define NGX_HAVE_ATOMIC_OPS 1 |
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80 |
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81 typedef volatile uint32_t ngx_atomic_t; |
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82 |
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83 |
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84 static ngx_inline uint32_t ngx_atomic_inc(ngx_atomic_t *value) |
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85 { |
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86 uint32_t old, new, res; |
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87 |
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88 old = *value; |
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89 |
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90 for ( ;; ) { |
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91 |
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92 new = old + 1; |
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93 res = new; |
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94 |
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95 __asm__ volatile ( |
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96 |
433
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97 "casa [%1] 0x80, %2, %0" |
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98 |
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99 : "+r" (res) : "r" (value), "r" (old)); |
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100 |
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101 if (res == old) { |
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102 return new; |
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103 } |
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104 |
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105 old = res; |
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106 } |
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107 } |
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108 |
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109 |
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110 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, |
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111 ngx_atomic_t old, |
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112 ngx_atomic_t set) |
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113 { |
428
5e73d0ea4dab
nginx-0.0.11-2004-09-16-20:10:13 import
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425
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114 uint32_t res = (uint32_t) set; |
425
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115 |
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116 __asm__ volatile ( |
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117 |
433
9a97dcdd2421
nginx-0.0.11-2004-09-21-19:47:05 import
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428
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118 "casa [%1] 0x80, %2, %0" |
425
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119 |
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120 : "+r" (res) : "r" (lock), "r" (old)); |
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121 |
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122 return (res == old); |
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123 } |
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124 |
266
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nginx-0.0.2-2004-02-23-23:57:12 import
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125 #else |
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126 |
435
5cdc4838d4e8
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127 #define NGX_HAVE_ATOMIC_OPS 0 |
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128 |
267
83205e0b5522
nginx-0.0.2-2004-02-24-20:31:46 import
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266
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129 typedef volatile uint32_t ngx_atomic_t; |
266
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130 |
435
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131 #define ngx_atomic_inc(x) ++(*(x)); |
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132 |
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133 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, |
5cdc4838d4e8
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134 ngx_atomic_t old, |
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135 ngx_atomic_t set) |
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136 { |
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137 return 1; |
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138 } |
266
5238e93961a1
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139 |
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140 #endif |
212
679f60139863
nginx-0.0.1-2003-12-19-11:15:11 import
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141 |
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142 |
373
018569a8f09c
nginx-0.0.7-2004-06-30-19:30:41 import
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371
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143 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin); |
018569a8f09c
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144 |
371
780e93985b93
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145 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) |
780e93985b93
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146 #define ngx_unlock(lock) *(lock) = 0 |
370
54f76b0b8dca
nginx-0.0.7-2004-06-27-22:01:57 import
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parents:
302
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147 |
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148 |
212
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149 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |