Mercurial > hg > nginx-quic
annotate src/core/ngx_shmtx.c @ 4251:cc7ea429170d stable-1.0
Merging r4190, r4232:
MP4 related fixes:
*) Fixing mp4 module seeking on 32-bit platforms.
*) Adding m4a and m4v MIME types (ticket #42).
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 01 Nov 2011 14:02:07 +0000 |
parents | 0daede16d68b |
children | 3f6040cd731e 4919fb357a5d |
rev | line source |
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611 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 #if (NGX_HAVE_ATOMIC_OPS) | |
12 | |
13 | |
14 ngx_int_t | |
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15 ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name) |
611 | 16 { |
17 mtx->lock = addr; | |
18 | |
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19 if (mtx->spin == (ngx_uint_t) -1) { |
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20 return NGX_OK; |
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21 } |
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22 |
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23 mtx->spin = 2048; |
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24 |
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25 #if (NGX_HAVE_POSIX_SEM) |
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26 |
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27 if (sem_init(&mtx->sem, 1, 0) == -1) { |
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28 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
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29 "sem_init() failed"); |
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30 } else { |
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31 mtx->semaphore = 1; |
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32 } |
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33 |
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34 #endif |
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35 |
611 | 36 return NGX_OK; |
37 } | |
38 | |
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39 |
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40 void |
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41 ngx_shmtx_destory(ngx_shmtx_t *mtx) |
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42 { |
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43 #if (NGX_HAVE_POSIX_SEM) |
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44 |
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45 if (mtx->semaphore) { |
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46 if (sem_destroy(&mtx->sem) == -1) { |
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47 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
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48 "sem_destroy() failed"); |
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49 } |
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50 } |
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51 |
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52 #endif |
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53 } |
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54 |
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55 |
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56 ngx_uint_t |
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57 ngx_shmtx_trylock(ngx_shmtx_t *mtx) |
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58 { |
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59 ngx_atomic_uint_t val; |
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60 |
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61 val = *mtx->lock; |
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62 |
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63 return ((val & 0x80000000) == 0 |
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64 && ngx_atomic_cmp_set(mtx->lock, val, val | 0x80000000)); |
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65 } |
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66 |
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67 |
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68 void |
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69 ngx_shmtx_lock(ngx_shmtx_t *mtx) |
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70 { |
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71 ngx_uint_t i, n; |
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72 ngx_atomic_uint_t val; |
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73 |
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74 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx lock"); |
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75 |
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76 for ( ;; ) { |
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77 |
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78 val = *mtx->lock; |
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79 |
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80 if ((val & 0x80000000) == 0 |
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81 && ngx_atomic_cmp_set(mtx->lock, val, val | 0x80000000)) |
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82 { |
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83 return; |
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84 } |
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85 |
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86 if (ngx_ncpu > 1) { |
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87 |
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88 for (n = 1; n < mtx->spin; n <<= 1) { |
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89 |
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90 for (i = 0; i < n; i++) { |
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91 ngx_cpu_pause(); |
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92 } |
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93 |
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94 val = *mtx->lock; |
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95 |
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96 if ((val & 0x80000000) == 0 |
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97 && ngx_atomic_cmp_set(mtx->lock, val, val | 0x80000000)) |
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98 { |
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99 return; |
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100 } |
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101 } |
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102 } |
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103 |
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104 #if (NGX_HAVE_POSIX_SEM) |
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105 |
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106 if (mtx->semaphore) { |
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107 val = *mtx->lock; |
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108 |
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109 if ((val & 0x80000000) |
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110 && ngx_atomic_cmp_set(mtx->lock, val, val + 1)) |
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111 { |
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112 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, |
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113 "shmtx wait %XA", val); |
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114 |
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115 while (sem_wait(&mtx->sem) == -1) { |
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116 ngx_err_t err; |
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117 |
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118 err = ngx_errno; |
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119 |
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120 if (err != NGX_EINTR) { |
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121 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err, |
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122 "sem_wait() failed while waiting on shmtx"); |
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123 break; |
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124 } |
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125 } |
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126 |
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127 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, |
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128 "shmtx awoke"); |
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129 } |
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130 |
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131 continue; |
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132 } |
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133 |
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134 #endif |
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135 |
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136 ngx_sched_yield(); |
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137 } |
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138 } |
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139 |
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140 |
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141 void |
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142 ngx_shmtx_unlock(ngx_shmtx_t *mtx) |
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143 { |
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144 ngx_atomic_uint_t val, old, wait; |
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145 |
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146 if (mtx->spin != (ngx_uint_t) -1) { |
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147 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx unlock"); |
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148 } |
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149 |
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150 for ( ;; ) { |
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151 |
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152 old = *mtx->lock; |
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153 wait = old & 0x7fffffff; |
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154 val = wait ? wait - 1 : 0; |
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155 |
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156 if (ngx_atomic_cmp_set(mtx->lock, old, val)) { |
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157 break; |
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158 } |
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159 } |
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160 |
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161 #if (NGX_HAVE_POSIX_SEM) |
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162 |
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163 if (wait == 0 || !mtx->semaphore) { |
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164 return; |
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165 } |
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166 |
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167 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, |
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168 "shmtx wake %XA", old); |
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169 |
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170 if (sem_post(&mtx->sem) == -1) { |
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171 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
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172 "sem_post() failed while wake shmtx"); |
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173 } |
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174 |
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175 #endif |
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176 } |
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177 |
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178 |
611 | 179 #else |
180 | |
181 | |
182 ngx_int_t | |
860
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183 ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name) |
611 | 184 { |
185 if (mtx->name) { | |
186 | |
187 if (ngx_strcmp(name, mtx->name) == 0) { | |
188 mtx->name = name; | |
189 return NGX_OK; | |
190 } | |
191 | |
192 ngx_shmtx_destory(mtx); | |
193 } | |
194 | |
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195 mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN, |
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196 NGX_FILE_DEFAULT_ACCESS); |
611 | 197 |
198 if (mtx->fd == NGX_INVALID_FILE) { | |
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199 ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, ngx_errno, |
611 | 200 ngx_open_file_n " \"%s\" failed", name); |
201 return NGX_ERROR; | |
202 } | |
203 | |
204 if (ngx_delete_file(name) == NGX_FILE_ERROR) { | |
860
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205 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
611 | 206 ngx_delete_file_n " \"%s\" failed", name); |
207 } | |
208 | |
209 mtx->name = name; | |
210 | |
211 return NGX_OK; | |
212 } | |
213 | |
214 | |
215 void | |
216 ngx_shmtx_destory(ngx_shmtx_t *mtx) | |
217 { | |
218 if (ngx_close_file(mtx->fd) == NGX_FILE_ERROR) { | |
860
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219 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, |
611 | 220 ngx_close_file_n " \"%s\" failed", mtx->name); |
221 } | |
222 } | |
223 | |
224 | |
3909
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225 ngx_uint_t |
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226 ngx_shmtx_trylock(ngx_shmtx_t *mtx) |
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227 { |
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228 ngx_err_t err; |
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229 |
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230 err = ngx_trylock_fd(mtx->fd); |
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231 |
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232 if (err == 0) { |
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233 return 1; |
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234 } |
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235 |
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236 if (err == NGX_EAGAIN) { |
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237 return 0; |
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238 } |
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239 |
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240 #if __osf__ /* Tru64 UNIX */ |
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241 |
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242 if (err == NGX_EACCESS) { |
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243 return 0; |
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244 } |
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245 |
611 | 246 #endif |
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247 |
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248 ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name); |
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249 |
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250 return 0; |
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251 } |
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252 |
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253 |
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254 void |
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255 ngx_shmtx_lock(ngx_shmtx_t *mtx) |
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256 { |
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257 ngx_err_t err; |
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258 |
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259 err = ngx_lock_fd(mtx->fd); |
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260 |
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261 if (err == 0) { |
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262 return; |
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263 } |
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264 |
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265 ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name); |
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266 } |
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267 |
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268 |
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269 void |
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270 ngx_shmtx_unlock(ngx_shmtx_t *mtx) |
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271 { |
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272 ngx_err_t err; |
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273 |
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274 err = ngx_unlock_fd(mtx->fd); |
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275 |
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276 if (err == 0) { |
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277 return; |
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use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents:
1100
diff
changeset
|
278 } |
0daede16d68b
use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents:
1100
diff
changeset
|
279 |
0daede16d68b
use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents:
1100
diff
changeset
|
280 ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name); |
0daede16d68b
use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents:
1100
diff
changeset
|
281 } |
0daede16d68b
use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents:
1100
diff
changeset
|
282 |
0daede16d68b
use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents:
1100
diff
changeset
|
283 #endif |