Mercurial > hg > nginx
annotate src/os/unix/ngx_atomic.h @ 7690:8253424d1aff
Added size check to ngx_http_alloc_large_header_buffer().
This ensures that copying won't write more than the buffer size
even if the buffer comes from hc->free and it is smaller than the large
client header buffer size in the virtual host configuration. This might
happen if size of large client header buffers is different in name-based
virtual hosts, similarly to the problem with number of buffers fixed
in 6926:e662cbf1b932.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Thu, 06 Aug 2020 05:02:22 +0300 |
| parents | 2cd019520210 |
| children | 09d15a2dbc6b |
| 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. |
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5 */ |
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8 #ifndef _NGX_ATOMIC_H_INCLUDED_ |
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9 #define _NGX_ATOMIC_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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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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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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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 #if 0 |
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52 #undef bool |
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53 #endif |
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54 |
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56 #define NGX_HAVE_ATOMIC_OPS 1 |
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57 |
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58 #if (NGX_PTR_SIZE == 8) |
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60 typedef int64_t ngx_atomic_int_t; |
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61 typedef uint64_t ngx_atomic_uint_t; |
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62 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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63 |
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64 #define ngx_atomic_cmp_set(lock, old, new) \ |
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65 OSAtomicCompareAndSwap64Barrier(old, new, (int64_t *) lock) |
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66 |
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67 #define ngx_atomic_fetch_add(value, add) \ |
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68 (OSAtomicAdd64(add, (int64_t *) value) - add) |
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69 |
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70 #else |
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71 |
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72 typedef int32_t ngx_atomic_int_t; |
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73 typedef uint32_t ngx_atomic_uint_t; |
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74 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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75 |
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76 #define ngx_atomic_cmp_set(lock, old, new) \ |
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77 OSAtomicCompareAndSwap32Barrier(old, new, (int32_t *) lock) |
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78 |
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79 #define ngx_atomic_fetch_add(value, add) \ |
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80 (OSAtomicAdd32(add, (int32_t *) value) - add) |
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81 |
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82 #endif |
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83 |
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84 #define ngx_memory_barrier() OSMemoryBarrier() |
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85 |
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86 #define ngx_cpu_pause() |
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87 |
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88 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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89 |
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90 |
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91 #elif (NGX_HAVE_GCC_ATOMIC) |
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92 |
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93 /* GCC 4.1 builtin atomic operations */ |
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94 |
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95 #define NGX_HAVE_ATOMIC_OPS 1 |
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96 |
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97 typedef long ngx_atomic_int_t; |
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98 typedef unsigned long ngx_atomic_uint_t; |
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99 |
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100 #if (NGX_PTR_SIZE == 8) |
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101 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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102 #else |
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103 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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104 #endif |
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105 |
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106 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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107 |
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109 #define ngx_atomic_cmp_set(lock, old, set) \ |
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110 __sync_bool_compare_and_swap(lock, old, set) |
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111 |
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112 #define ngx_atomic_fetch_add(value, add) \ |
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113 __sync_fetch_and_add(value, add) |
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114 |
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115 #define ngx_memory_barrier() __sync_synchronize() |
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116 |
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117 #if ( __i386__ || __i386 || __amd64__ || __amd64 ) |
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118 #define ngx_cpu_pause() __asm__ ("pause") |
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119 #else |
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120 #define ngx_cpu_pause() |
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121 #endif |
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122 |
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123 |
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124 #elif ( __i386__ || __i386 ) |
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125 |
| 561 | 126 typedef int32_t ngx_atomic_int_t; |
| 127 typedef uint32_t ngx_atomic_uint_t; | |
| 495 | 128 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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129 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
| 493 | 130 |
| 131 | |
| 561 | 132 #if ( __SUNPRO_C ) |
| 493 | 133 |
| 561 | 134 #define NGX_HAVE_ATOMIC_OPS 1 |
| 493 | 135 |
| 561 | 136 ngx_atomic_uint_t |
| 137 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
| 138 ngx_atomic_uint_t set); | |
| 493 | 139 |
| 561 | 140 ngx_atomic_int_t |
| 141 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add); | |
| 493 | 142 |
| 1309 | 143 /* |
| 144 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")', | |
| 145 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_x86.il | |
| 146 */ | |
| 147 | |
| 148 void | |
| 149 ngx_cpu_pause(void); | |
| 150 | |
| 561 | 151 /* the code in src/os/unix/ngx_sunpro_x86.il */ |
| 493 | 152 |
| 563 | 153 #define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile") |
| 154 | |
| 493 | 155 |
| 561 | 156 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
| 157 | |
| 158 #define NGX_HAVE_ATOMIC_OPS 1 | |
| 493 | 159 |
| 561 | 160 #include "ngx_gcc_atomic_x86.h" |
| 493 | 161 |
| 561 | 162 #endif |
| 493 | 163 |
| 164 | |
| 547 | 165 #elif ( __amd64__ || __amd64 ) |
| 493 | 166 |
| 561 | 167 typedef int64_t ngx_atomic_int_t; |
| 168 typedef uint64_t ngx_atomic_uint_t; | |
| 495 | 169 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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170 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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171 |
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172 |
| 561 | 173 #if ( __SUNPRO_C ) |
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174 |
| 561 | 175 #define NGX_HAVE_ATOMIC_OPS 1 |
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176 |
| 561 | 177 ngx_atomic_uint_t |
| 178 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
| 179 ngx_atomic_uint_t set); | |
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180 |
| 561 | 181 ngx_atomic_int_t |
| 182 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add); | |
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183 |
| 1309 | 184 /* |
| 185 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")', | |
| 186 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_amd64.il | |
| 187 */ | |
| 188 | |
| 189 void | |
| 190 ngx_cpu_pause(void); | |
| 191 | |
| 561 | 192 /* the code in src/os/unix/ngx_sunpro_amd64.il */ |
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193 |
| 563 | 194 #define ngx_memory_barrier() __asm (".volatile"); __asm (".nonvolatile") |
| 195 | |
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196 |
| 561 | 197 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
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198 |
| 561 | 199 #define NGX_HAVE_ATOMIC_OPS 1 |
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200 |
| 561 | 201 #include "ngx_gcc_atomic_amd64.h" |
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202 |
| 561 | 203 #endif |
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204 |
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301
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205 |
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206 #elif ( __sparc__ || __sparc || __sparcv9 ) |
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207 |
| 561 | 208 #if (NGX_PTR_SIZE == 8) |
| 209 | |
| 210 typedef int64_t ngx_atomic_int_t; | |
| 211 typedef uint64_t ngx_atomic_uint_t; | |
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212 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
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213 |
| 493 | 214 #else |
| 561 | 215 |
| 216 typedef int32_t ngx_atomic_int_t; | |
| 217 typedef uint32_t ngx_atomic_uint_t; | |
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218 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
| 561 | 219 |
| 493 | 220 #endif |
| 221 | |
| 495 | 222 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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223 |
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224 |
| 561 | 225 #if ( __SUNPRO_C ) |
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226 |
| 561 | 227 #define NGX_HAVE_ATOMIC_OPS 1 |
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228 |
| 561 | 229 #include "ngx_sunpro_atomic_sparc64.h" |
| 493 | 230 |
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231 |
| 561 | 232 #else /* ( __GNUC__ || __INTEL_COMPILER ) */ |
| 493 | 233 |
| 561 | 234 #define NGX_HAVE_ATOMIC_OPS 1 |
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235 |
| 561 | 236 #include "ngx_gcc_atomic_sparc64.h" |
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237 |
| 561 | 238 #endif |
| 493 | 239 |
| 240 | |
| 613 | 241 #elif ( __powerpc__ || __POWERPC__ ) |
| 493 | 242 |
| 243 #define NGX_HAVE_ATOMIC_OPS 1 | |
| 244 | |
| 245 #if (NGX_PTR_SIZE == 8) | |
| 561 | 246 |
| 247 typedef int64_t ngx_atomic_int_t; | |
| 248 typedef uint64_t ngx_atomic_uint_t; | |
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249 #define NGX_ATOMIC_T_LEN (sizeof("-9223372036854775808") - 1) |
| 561 | 250 |
| 493 | 251 #else |
| 561 | 252 |
| 253 typedef int32_t ngx_atomic_int_t; | |
| 254 typedef uint32_t ngx_atomic_uint_t; | |
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255 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
| 561 | 256 |
| 493 | 257 #endif |
| 258 | |
| 495 | 259 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
| 493 | 260 |
| 261 | |
| 561 | 262 #include "ngx_gcc_atomic_ppc.h" |
| 493 | 263 |
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264 #endif |
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265 |
| 493 | 266 |
| 561 | 267 #if !(NGX_HAVE_ATOMIC_OPS) |
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268 |
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269 #define NGX_HAVE_ATOMIC_OPS 0 |
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270 |
| 561 | 271 typedef int32_t ngx_atomic_int_t; |
| 272 typedef uint32_t ngx_atomic_uint_t; | |
| 495 | 273 typedef volatile ngx_atomic_uint_t ngx_atomic_t; |
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274 #define NGX_ATOMIC_T_LEN (sizeof("-2147483648") - 1) |
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275 |
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276 |
| 495 | 277 static ngx_inline ngx_atomic_uint_t |
| 278 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, | |
| 6474 | 279 ngx_atomic_uint_t set) |
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280 { |
| 6474 | 281 if (*lock == old) { |
| 282 *lock = set; | |
| 283 return 1; | |
| 284 } | |
| 561 | 285 |
| 6474 | 286 return 0; |
| 561 | 287 } |
| 288 | |
| 289 | |
| 290 static ngx_inline ngx_atomic_int_t | |
| 291 ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add) | |
| 292 { | |
| 6474 | 293 ngx_atomic_int_t old; |
| 561 | 294 |
| 6474 | 295 old = *value; |
| 296 *value += add; | |
| 561 | 297 |
| 6474 | 298 return old; |
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299 } |
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300 |
| 571 | 301 #define ngx_memory_barrier() |
| 611 | 302 #define ngx_cpu_pause() |
| 571 | 303 |
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304 #endif |
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305 |
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306 |
| 611 | 307 void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin); |
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308 |
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309 #define ngx_trylock(lock) (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1)) |
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310 #define ngx_unlock(lock) *(lock) = 0 |
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311 |
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312 |
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313 #endif /* _NGX_ATOMIC_H_INCLUDED_ */ |