Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_atomic.h @ 4500:9dfe02dd0f11
Added msleep() on reload to allow new processes to start.
This is expected to ensure smoother operation on reload (and with less
chance of listen queue overflows).
Prodded by Igor Sysoev.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 28 Feb 2012 11:40:18 +0000 |
parents | d620f497c50f |
children | 4c36e15651f7 |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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8 #ifndef _NGX_ATOMIC_H_INCLUDED_ |
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9 #define _NGX_ATOMIC_H_INCLUDED_ |
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10 |
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11 |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 |
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15 |
3363 | 16 #if (NGX_HAVE_LIBATOMIC) |
17 | |
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18 #define AO_REQUIRE_CAS |
3363 | 19 #include <atomic_ops.h> |
20 | |
21 #define NGX_HAVE_ATOMIC_OPS 1 | |
22 | |
23 typedef long ngx_atomic_int_t; | |
24 typedef AO_t ngx_atomic_uint_t; | |
25 typedef volatile ngx_atomic_uint_t ngx_atomic_t; | |
26 | |
27 #if (NGX_PTR_SIZE == 8) | |
28 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) | |
29 #else | |
30 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) | |
31 #endif | |
32 | |
33 #define ngx_atomic_cmp_set(lock, old, new) \ | |
34 AO_compare_and_swap(lock, old, new) | |
35 #define ngx_atomic_fetch_add(value, add) \ | |
36 AO_fetch_and_add(value, add) | |
37 #define ngx_memory_barrier() AO_nop() | |
38 #define ngx_cpu_pause() | |
39 | |
40 | |
41 #elif (NGX_DARWIN_ATOMIC) | |
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42 |
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43 /* |
940 | 44 * use Darwin 8 atomic(3) and barrier(3) operations |
45 * optimized at run-time for UP and SMP | |
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46 */ |
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47 |
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48 #include <libkern/OSAtomic.h> |
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49 |
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50 /* "bool" conflicts with perl's CORE/handy.h */ |
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51 #undef bool |
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52 |
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53 |
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54 #define NGX_HAVE_ATOMIC_OPS 1 |
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55 |
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56 #if (NGX_PTR_SIZE == 8) |
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57 |
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58 typedef int64_t ngx_atomic_int_t; |
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59 typedef uint64_t ngx_atomic_uint_t; |
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60 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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61 |
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62 #define ngx_atomic_cmp_set(lock, old, new) \ |
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63 OSAtomicCompareAndSwap64Barrier(old, new, (int64_t *) lock) |
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64 |
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65 #define ngx_atomic_fetch_add(value, add) \ |
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66 (OSAtomicAdd64(add, (int64_t *) value) - add) |
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67 |
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68 #else |
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69 |
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70 typedef int32_t ngx_atomic_int_t; |
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71 typedef uint32_t ngx_atomic_uint_t; |
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72 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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73 |
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74 #define ngx_atomic_cmp_set(lock, old, new) \ |
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75 OSAtomicCompareAndSwap32Barrier(old, new, (int32_t *) lock) |
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76 |
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77 #define ngx_atomic_fetch_add(value, add) \ |
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78 (OSAtomicAdd32(add, (int32_t *) value) - add) |
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79 |
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80 #endif |
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81 |
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82 #define ngx_memory_barrier() OSMemoryBarrier() |
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83 |
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84 #define ngx_cpu_pause() |
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85 |
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86 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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87 |
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88 |
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89 #elif (NGX_HAVE_GCC_ATOMIC) |
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90 |
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91 /* GCC 4.1 builtin atomic operations */ |
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92 |
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93 #define NGX_HAVE_ATOMIC_OPS 1 |
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94 |
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95 typedef long ngx_atomic_int_t; |
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96 typedef unsigned long ngx_atomic_uint_t; |
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97 |
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98 #if (NGX_PTR_SIZE == 8) |
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99 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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100 #else |
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101 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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102 #endif |
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103 |
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104 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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105 |
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106 |
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107 #define ngx_atomic_cmp_set(lock, old, set) \ |
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108 __sync_bool_compare_and_swap(lock, old, set) |
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109 |
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110 #define ngx_atomic_fetch_add(value, add) \ |
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111 __sync_fetch_and_add(value, add) |
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112 |
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113 #define ngx_memory_barrier() __sync_synchronize() |
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114 |
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115 #if ( __i386__ || __i386 || __amd64__ || __amd64 ) |
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116 #define ngx_cpu_pause() __asm__ ("pause") |
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117 #else |
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118 #define ngx_cpu_pause() |
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119 #endif |
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120 |
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121 |
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122 #elif ( __i386__ || __i386 ) |
266
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123 |
561 | 124 typedef int32_t ngx_atomic_int_t; |
125 typedef uint32_t ngx_atomic_uint_t; | |
495 | 126 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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127 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
493 | 128 |
129 | |
561 | 130 #if ( __SUNPRO_C ) |
493 | 131 |
561 | 132 #define NGX_HAVE_ATOMIC_OPS 1 |
493 | 133 |
561 | 134 ngx_atomic_uint_t |
135 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
136 ngx_atomic_uint_t set); | |
493 | 137 |
561 | 138 ngx_atomic_int_t |
139 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add); | |
493 | 140 |
1309 | 141 /* |
142 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")', | |
143 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_x86.il | |
144 */ | |
145 | |
146 void | |
147 ngx_cpu_pause(void); | |
148 | |
561 | 149 /* the code in src/os/unix/ngx_sunpro_x86.il */ |
493 | 150 |
563 | 151 #define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile") |
152 | |
493 | 153 |
561 | 154 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
155 | |
156 #define NGX_HAVE_ATOMIC_OPS 1 | |
493 | 157 |
561 | 158 #include "ngx_gcc_atomic_x86.h" |
493 | 159 |
561 | 160 #endif |
493 | 161 |
162 | |
547 | 163 #elif ( __amd64__ || __amd64 ) |
493 | 164 |
561 | 165 typedef int64_t ngx_atomic_int_t; |
166 typedef uint64_t ngx_atomic_uint_t; | |
495 | 167 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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168 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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169 |
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170 |
561 | 171 #if ( __SUNPRO_C ) |
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172 |
561 | 173 #define NGX_HAVE_ATOMIC_OPS 1 |
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174 |
561 | 175 ngx_atomic_uint_t |
176 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
177 ngx_atomic_uint_t set); | |
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178 |
561 | 179 ngx_atomic_int_t |
180 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add); | |
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181 |
1309 | 182 /* |
183 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")', | |
184 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_amd64.il | |
185 */ | |
186 | |
187 void | |
188 ngx_cpu_pause(void); | |
189 | |
561 | 190 /* the code in src/os/unix/ngx_sunpro_amd64.il */ |
266
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191 |
563 | 192 #define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile") |
193 | |
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194 |
561 | 195 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
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196 |
561 | 197 #define NGX_HAVE_ATOMIC_OPS 1 |
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198 |
561 | 199 #include "ngx_gcc_atomic_amd64.h" |
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200 |
561 | 201 #endif |
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202 |
301
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203 |
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204 #elif ( __sparc__ || __sparc || __sparcv9 ) |
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205 |
561 | 206 #if (NGX_PTR_SIZE == 8) |
207 | |
208 typedef int64_t ngx_atomic_int_t; | |
209 typedef uint64_t ngx_atomic_uint_t; | |
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210 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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211 |
493 | 212 #else |
561 | 213 |
214 typedef int32_t ngx_atomic_int_t; | |
215 typedef uint32_t ngx_atomic_uint_t; | |
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216 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
561 | 217 |
493 | 218 #endif |
219 | |
495 | 220 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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221 |
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222 |
561 | 223 #if ( __SUNPRO_C ) |
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224 |
561 | 225 #define NGX_HAVE_ATOMIC_OPS 1 |
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226 |
561 | 227 #include "ngx_sunpro_atomic_sparc64.h" |
493 | 228 |
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229 |
561 | 230 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
493 | 231 |
561 | 232 #define NGX_HAVE_ATOMIC_OPS 1 |
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233 |
561 | 234 #include "ngx_gcc_atomic_sparc64.h" |
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235 |
561 | 236 #endif |
493 | 237 |
238 | |
613 | 239 #elif ( __powerpc__ || __POWERPC__ ) |
493 | 240 |
241 #define NGX_HAVE_ATOMIC_OPS 1 | |
242 | |
243 #if (NGX_PTR_SIZE == 8) | |
561 | 244 |
245 typedef int64_t ngx_atomic_int_t; | |
246 typedef uint64_t ngx_atomic_uint_t; | |
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247 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
561 | 248 |
493 | 249 #else |
561 | 250 |
251 typedef int32_t ngx_atomic_int_t; | |
252 typedef uint32_t ngx_atomic_uint_t; | |
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253 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
561 | 254 |
493 | 255 #endif |
256 | |
495 | 257 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
493 | 258 |
259 | |
561 | 260 #include "ngx_gcc_atomic_ppc.h" |
493 | 261 |
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262 #endif |
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263 |
493 | 264 |
561 | 265 #if !(NGX_HAVE_ATOMIC_OPS) |
266
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266 |
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267 #define NGX_HAVE_ATOMIC_OPS 0 |
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268 |
561 | 269 typedef int32_t ngx_atomic_int_t; |
270 typedef uint32_t ngx_atomic_uint_t; | |
495 | 271 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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272 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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273 |
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274 |
495 | 275 static ngx_inline ngx_atomic_uint_t |
276 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
277 ngx_atomic_uint_t set) | |
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278 { |
571 | 279 if (*lock == old) { |
561 | 280 *lock = set; |
281 return 1; | |
282 } | |
283 | |
284 return 0; | |
285 } | |
286 | |
287 | |
288 static ngx_inline ngx_atomic_int_t | |
289 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
290 { | |
291 ngx_atomic_int_t old; | |
292 | |
293 old = *value; | |
294 *value += add; | |
295 | |
296 return old; | |
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297 } |
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298 |
571 | 299 #define ngx_memory_barrier() |
611 | 300 #define ngx_cpu_pause() |
571 | 301 |
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302 #endif |
212
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303 |
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304 |
611 | 305 void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin); |
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306 |
371
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307 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) |
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308 #define ngx_unlock(lock) *(lock) = 0 |
370
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309 |
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310 |
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311 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |