Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_atomic.h @ 4311:45272aab5eea
Unlock of shared memory zones on process crash.
If process exited abnormally while holding lock on some shared memory zone -
unlock it. It may be not safe thing to do (as crash with lock held may
result in corrupted shared memory structure, and other processes will
subsequently crash while trying to access shared data), therefore complain
loudly if unlock succeeds.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Wed, 23 Nov 2011 14:09:19 +0000 |
| parents | 5d17022a1e88 |
| children | d620f497c50f |
| rev | line source |
|---|---|
|
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #ifndef _NGX_ATOMIC_H_INCLUDED_ |
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8 #define _NGX_ATOMIC_H_INCLUDED_ |
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11 #include <ngx_config.h> |
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12 #include <ngx_core.h> |
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| 3363 | 15 #if (NGX_HAVE_LIBATOMIC) |
| 16 | |
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17 #define AO_REQUIRE_CAS |
| 3363 | 18 #include <atomic_ops.h> |
| 19 | |
| 20 #define NGX_HAVE_ATOMIC_OPS 1 | |
| 21 | |
| 22 typedef long ngx_atomic_int_t; | |
| 23 typedef AO_t ngx_atomic_uint_t; | |
| 24 typedef volatile ngx_atomic_uint_t ngx_atomic_t; | |
| 25 | |
| 26 #if (NGX_PTR_SIZE == 8) | |
| 27 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) | |
| 28 #else | |
| 29 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) | |
| 30 #endif | |
| 31 | |
| 32 #define ngx_atomic_cmp_set(lock, old, new) \ | |
| 33 AO_compare_and_swap(lock, old, new) | |
| 34 #define ngx_atomic_fetch_add(value, add) \ | |
| 35 AO_fetch_and_add(value, add) | |
| 36 #define ngx_memory_barrier() AO_nop() | |
| 37 #define ngx_cpu_pause() | |
| 38 | |
| 39 | |
| 40 #elif (NGX_DARWIN_ATOMIC) | |
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42 /* |
| 940 | 43 * use Darwin 8 atomic(3) and barrier(3) operations |
| 44 * optimized at run-time for UP and SMP | |
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45 */ |
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46 |
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47 #include <libkern/OSAtomic.h> |
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48 |
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49 /* "bool" conflicts with perl's CORE/handy.h */ |
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50 #undef bool |
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51 |
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52 |
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53 #define NGX_HAVE_ATOMIC_OPS 1 |
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55 #if (NGX_PTR_SIZE == 8) |
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56 |
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57 typedef int64_t ngx_atomic_int_t; |
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58 typedef uint64_t ngx_atomic_uint_t; |
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59 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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61 #define ngx_atomic_cmp_set(lock, old, new) \ |
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62 OSAtomicCompareAndSwap64Barrier(old, new, (int64_t *) lock) |
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63 |
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64 #define ngx_atomic_fetch_add(value, add) \ |
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65 (OSAtomicAdd64(add, (int64_t *) value) - add) |
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66 |
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67 #else |
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68 |
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69 typedef int32_t ngx_atomic_int_t; |
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70 typedef uint32_t ngx_atomic_uint_t; |
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71 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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72 |
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73 #define ngx_atomic_cmp_set(lock, old, new) \ |
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74 OSAtomicCompareAndSwap32Barrier(old, new, (int32_t *) lock) |
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75 |
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76 #define ngx_atomic_fetch_add(value, add) \ |
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77 (OSAtomicAdd32(add, (int32_t *) value) - add) |
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78 |
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79 #endif |
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80 |
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81 #define ngx_memory_barrier() OSMemoryBarrier() |
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82 |
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83 #define ngx_cpu_pause() |
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84 |
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85 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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86 |
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87 |
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88 #elif (NGX_HAVE_GCC_ATOMIC) |
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89 |
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90 /* GCC 4.1 builtin atomic operations */ |
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91 |
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92 #define NGX_HAVE_ATOMIC_OPS 1 |
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93 |
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94 typedef long ngx_atomic_int_t; |
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95 typedef unsigned long ngx_atomic_uint_t; |
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96 |
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97 #if (NGX_PTR_SIZE == 8) |
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98 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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99 #else |
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100 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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101 #endif |
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102 |
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103 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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104 |
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106 #define ngx_atomic_cmp_set(lock, old, set) \ |
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107 __sync_bool_compare_and_swap(lock, old, set) |
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108 |
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109 #define ngx_atomic_fetch_add(value, add) \ |
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110 __sync_fetch_and_add(value, add) |
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111 |
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112 #define ngx_memory_barrier() __sync_synchronize() |
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113 |
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114 #if ( __i386__ || __i386 || __amd64__ || __amd64 ) |
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115 #define ngx_cpu_pause() __asm__ ("pause") |
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116 #else |
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117 #define ngx_cpu_pause() |
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118 #endif |
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119 |
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120 |
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121 #elif ( __i386__ || __i386 ) |
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122 |
| 561 | 123 typedef int32_t ngx_atomic_int_t; |
| 124 typedef uint32_t ngx_atomic_uint_t; | |
| 495 | 125 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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126 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
| 493 | 127 |
| 128 | |
| 561 | 129 #if ( __SUNPRO_C ) |
| 493 | 130 |
| 561 | 131 #define NGX_HAVE_ATOMIC_OPS 1 |
| 493 | 132 |
| 561 | 133 ngx_atomic_uint_t |
| 134 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
| 135 ngx_atomic_uint_t set); | |
| 493 | 136 |
| 561 | 137 ngx_atomic_int_t |
| 138 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add); | |
| 493 | 139 |
| 1309 | 140 /* |
| 141 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")', | |
| 142 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_x86.il | |
| 143 */ | |
| 144 | |
| 145 void | |
| 146 ngx_cpu_pause(void); | |
| 147 | |
| 561 | 148 /* the code in src/os/unix/ngx_sunpro_x86.il */ |
| 493 | 149 |
| 563 | 150 #define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile") |
| 151 | |
| 493 | 152 |
| 561 | 153 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
| 154 | |
| 155 #define NGX_HAVE_ATOMIC_OPS 1 | |
| 493 | 156 |
| 561 | 157 #include "ngx_gcc_atomic_x86.h" |
| 493 | 158 |
| 561 | 159 #endif |
| 493 | 160 |
| 161 | |
| 547 | 162 #elif ( __amd64__ || __amd64 ) |
| 493 | 163 |
| 561 | 164 typedef int64_t ngx_atomic_int_t; |
| 165 typedef uint64_t ngx_atomic_uint_t; | |
| 495 | 166 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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167 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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168 |
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169 |
| 561 | 170 #if ( __SUNPRO_C ) |
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171 |
| 561 | 172 #define NGX_HAVE_ATOMIC_OPS 1 |
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173 |
| 561 | 174 ngx_atomic_uint_t |
| 175 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
| 176 ngx_atomic_uint_t set); | |
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177 |
| 561 | 178 ngx_atomic_int_t |
| 179 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add); | |
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180 |
| 1309 | 181 /* |
| 182 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")', | |
| 183 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_amd64.il | |
| 184 */ | |
| 185 | |
| 186 void | |
| 187 ngx_cpu_pause(void); | |
| 188 | |
| 561 | 189 /* the code in src/os/unix/ngx_sunpro_amd64.il */ |
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190 |
| 563 | 191 #define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile") |
| 192 | |
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193 |
| 561 | 194 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
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195 |
| 561 | 196 #define NGX_HAVE_ATOMIC_OPS 1 |
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197 |
| 561 | 198 #include "ngx_gcc_atomic_amd64.h" |
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199 |
| 561 | 200 #endif |
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201 |
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301
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202 |
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203 #elif ( __sparc__ || __sparc || __sparcv9 ) |
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204 |
| 561 | 205 #if (NGX_PTR_SIZE == 8) |
| 206 | |
| 207 typedef int64_t ngx_atomic_int_t; | |
| 208 typedef uint64_t ngx_atomic_uint_t; | |
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209 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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210 |
| 493 | 211 #else |
| 561 | 212 |
| 213 typedef int32_t ngx_atomic_int_t; | |
| 214 typedef uint32_t ngx_atomic_uint_t; | |
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215 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
| 561 | 216 |
| 493 | 217 #endif |
| 218 | |
| 495 | 219 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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220 |
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221 |
| 561 | 222 #if ( __SUNPRO_C ) |
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223 |
| 561 | 224 #define NGX_HAVE_ATOMIC_OPS 1 |
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225 |
| 561 | 226 #include "ngx_sunpro_atomic_sparc64.h" |
| 493 | 227 |
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228 |
| 561 | 229 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
| 493 | 230 |
| 561 | 231 #define NGX_HAVE_ATOMIC_OPS 1 |
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232 |
| 561 | 233 #include "ngx_gcc_atomic_sparc64.h" |
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234 |
| 561 | 235 #endif |
| 493 | 236 |
| 237 | |
| 613 | 238 #elif ( __powerpc__ || __POWERPC__ ) |
| 493 | 239 |
| 240 #define NGX_HAVE_ATOMIC_OPS 1 | |
| 241 | |
| 242 #if (NGX_PTR_SIZE == 8) | |
| 561 | 243 |
| 244 typedef int64_t ngx_atomic_int_t; | |
| 245 typedef uint64_t ngx_atomic_uint_t; | |
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246 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
| 561 | 247 |
| 493 | 248 #else |
| 561 | 249 |
| 250 typedef int32_t ngx_atomic_int_t; | |
| 251 typedef uint32_t ngx_atomic_uint_t; | |
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252 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
| 561 | 253 |
| 493 | 254 #endif |
| 255 | |
| 495 | 256 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
| 493 | 257 |
| 258 | |
| 561 | 259 #include "ngx_gcc_atomic_ppc.h" |
| 493 | 260 |
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261 #endif |
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262 |
| 493 | 263 |
| 561 | 264 #if !(NGX_HAVE_ATOMIC_OPS) |
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265 |
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266 #define NGX_HAVE_ATOMIC_OPS 0 |
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267 |
| 561 | 268 typedef int32_t ngx_atomic_int_t; |
| 269 typedef uint32_t ngx_atomic_uint_t; | |
| 495 | 270 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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271 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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272 |
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273 |
| 495 | 274 static ngx_inline ngx_atomic_uint_t |
| 275 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
| 276 ngx_atomic_uint_t set) | |
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277 { |
| 571 | 278 if (*lock == old) { |
| 561 | 279 *lock = set; |
| 280 return 1; | |
| 281 } | |
| 282 | |
| 283 return 0; | |
| 284 } | |
| 285 | |
| 286 | |
| 287 static ngx_inline ngx_atomic_int_t | |
| 288 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
| 289 { | |
| 290 ngx_atomic_int_t old; | |
| 291 | |
| 292 old = *value; | |
| 293 *value += add; | |
| 294 | |
| 295 return old; | |
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296 } |
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297 |
| 571 | 298 #define ngx_memory_barrier() |
| 611 | 299 #define ngx_cpu_pause() |
| 571 | 300 |
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301 #endif |
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302 |
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303 |
| 611 | 304 void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin); |
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305 |
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306 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) |
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307 #define ngx_unlock(lock) *(lock) = 0 |
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308 |
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309 |
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310 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |