Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_atomic.h @ 433:9a97dcdd2421
nginx-0.0.11-2004-09-21-19:47:05 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 21 Sep 2004 15:47:05 +0000 |
parents | 5e73d0ea4dab |
children | 5cdc4838d4e8 |
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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23 |
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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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29 |
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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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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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39 |
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40 __asm__ volatile ( |
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41 |
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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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45 |
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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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50 |
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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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57 |
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58 __asm__ volatile ( |
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59 |
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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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69 |
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70 |
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71 #elif ( __sparc__ ) |
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72 |
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73 typedef volatile uint32_t ngx_atomic_t; |
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74 |
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75 |
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76 static ngx_inline uint32_t ngx_atomic_inc(ngx_atomic_t *value) |
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77 { |
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78 uint32_t old, new, res; |
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79 |
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80 old = *value; |
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81 |
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82 for ( ;; ) { |
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83 |
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84 new = old + 1; |
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85 res = new; |
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86 |
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87 __asm__ volatile ( |
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88 |
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89 "casa [%1] 0x80, %2, %0" |
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90 |
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91 : "+r" (res) : "r" (value), "r" (old)); |
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92 |
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93 if (res == old) { |
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94 return new; |
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95 } |
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96 |
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97 old = res; |
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98 } |
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99 } |
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100 |
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101 |
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102 /* STUB */ |
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103 #define ngx_atomic_dec(x) (*(x))--; |
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104 /**/ |
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105 |
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106 |
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107 static ngx_inline uint32_t ngx_atomic_cmp_set(ngx_atomic_t *lock, |
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108 ngx_atomic_t old, |
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109 ngx_atomic_t set) |
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110 { |
428
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111 uint32_t res = (uint32_t) set; |
425
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112 |
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113 __asm__ volatile ( |
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114 |
433
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115 "casa [%1] 0x80, %2, %0" |
425
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116 |
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117 : "+r" (res) : "r" (lock), "r" (old)); |
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118 |
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119 return (res == old); |
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120 } |
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121 |
266
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122 #else |
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123 |
267
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124 typedef volatile uint32_t ngx_atomic_t; |
266
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125 |
213
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126 /* STUB */ |
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127 #define ngx_atomic_inc(x) ++(*(x)); |
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128 #define ngx_atomic_dec(x) --(*(x)); |
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129 #define ngx_atomic_cmp_set(lock, old, set) 1 |
266
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130 /**/ |
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131 |
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132 #endif |
212
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133 |
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134 |
373
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135 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin); |
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136 |
371
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137 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) |
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138 #define ngx_unlock(lock) *(lock) = 0 |
370
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139 |
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140 |
212
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141 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |