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annotate src/core/ngx_shmtx.c @ 4450:4919fb357a5d stable-1.0

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Merge of r4406, r4413: copyrights updated.
author Maxim Dounin <mdounin@mdounin.ru>
date Sun, 05 Feb 2012 20:02:59 +0000
parents 0daede16d68b
children
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10
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11
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12 #if (NGX_HAVE_ATOMIC_OPS)
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13
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14
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15 ngx_int_t
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16 ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name)
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17 {
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18 mtx->lock = addr;
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19
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20 if (mtx->spin == (ngx_uint_t) -1) {
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21 return NGX_OK;
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22 }
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23
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24 mtx->spin = 2048;
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25
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26 #if (NGX_HAVE_POSIX_SEM)
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27
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28 if (sem_init(&mtx->sem, 1, 0) == -1) {
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29 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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30 "sem_init() failed");
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31 } else {
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32 mtx->semaphore = 1;
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33 }
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34
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35 #endif
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36
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37 return NGX_OK;
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38 }
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39
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40
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41 void
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42 ngx_shmtx_destory(ngx_shmtx_t *mtx)
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43 {
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44 #if (NGX_HAVE_POSIX_SEM)
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45
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46 if (mtx->semaphore) {
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47 if (sem_destroy(&mtx->sem) == -1) {
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48 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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49 "sem_destroy() failed");
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50 }
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51 }
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52
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53 #endif
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54 }
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55
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56
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57 ngx_uint_t
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58 ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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59 {
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60 ngx_atomic_uint_t val;
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61
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62 val = *mtx->lock;
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63
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64 return ((val & 0x80000000) == 0
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65 && ngx_atomic_cmp_set(mtx->lock, val, val | 0x80000000));
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66 }
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67
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68
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69 void
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70 ngx_shmtx_lock(ngx_shmtx_t *mtx)
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71 {
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72 ngx_uint_t i, n;
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73 ngx_atomic_uint_t val;
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74
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75 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx lock");
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76
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77 for ( ;; ) {
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78
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79 val = *mtx->lock;
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80
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81 if ((val & 0x80000000) == 0
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82 && ngx_atomic_cmp_set(mtx->lock, val, val | 0x80000000))
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83 {
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84 return;
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85 }
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86
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87 if (ngx_ncpu > 1) {
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88
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89 for (n = 1; n < mtx->spin; n <<= 1) {
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90
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91 for (i = 0; i < n; i++) {
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92 ngx_cpu_pause();
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93 }
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94
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95 val = *mtx->lock;
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96
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97 if ((val & 0x80000000) == 0
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98 && ngx_atomic_cmp_set(mtx->lock, val, val | 0x80000000))
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99 {
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100 return;
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101 }
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102 }
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103 }
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104
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105 #if (NGX_HAVE_POSIX_SEM)
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106
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107 if (mtx->semaphore) {
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108 val = *mtx->lock;
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109
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110 if ((val & 0x80000000)
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111 && ngx_atomic_cmp_set(mtx->lock, val, val + 1))
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112 {
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113 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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114 "shmtx wait %XA", val);
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115
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116 while (sem_wait(&mtx->sem) == -1) {
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117 ngx_err_t err;
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118
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119 err = ngx_errno;
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120
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121 if (err != NGX_EINTR) {
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122 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
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123 "sem_wait() failed while waiting on shmtx");
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124 break;
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125 }
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126 }
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127
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128 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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129 "shmtx awoke");
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130 }
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131
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parents: 1100
diff changeset
132 continue;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
133 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
134
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
135 #endif
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
136
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
137 ngx_sched_yield();
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
138 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
139 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
140
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
141
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
142 void
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
143 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
144 {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
145 ngx_atomic_uint_t val, old, wait;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
146
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
147 if (mtx->spin != (ngx_uint_t) -1) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
148 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx unlock");
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Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
149 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
150
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
151 for ( ;; ) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
152
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
153 old = *mtx->lock;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
154 wait = old & 0x7fffffff;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
155 val = wait ? wait - 1 : 0;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
156
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
157 if (ngx_atomic_cmp_set(mtx->lock, old, val)) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
158 break;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
159 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
160 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
161
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
162 #if (NGX_HAVE_POSIX_SEM)
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parents: 1100
diff changeset
163
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
164 if (wait == 0 || !mtx->semaphore) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
165 return;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
166 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
167
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
168 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
169 "shmtx wake %XA", old);
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
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parents: 1100
diff changeset
170
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
171 if (sem_post(&mtx->sem) == -1) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
172 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
173 "sem_post() failed while wake shmtx");
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
174 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
175
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
176 #endif
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
177 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
178
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
179
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
180 #else
3f8a2132b93d nginx-0.3.27-RELEASE import
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parents:
diff changeset
181
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
182
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
183 ngx_int_t
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 611
diff changeset
184 ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name)
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
185 {
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
186 if (mtx->name) {
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
187
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
188 if (ngx_strcmp(name, mtx->name) == 0) {
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
189 mtx->name = name;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
190 return NGX_OK;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
191 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
192
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
193 ngx_shmtx_destory(mtx);
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
194 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
195
1100
01884449985f fix building on platforms with non-supported atomic operations
Igor Sysoev <igor@sysoev.ru>
parents: 860
diff changeset
196 mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN,
01884449985f fix building on platforms with non-supported atomic operations
Igor Sysoev <igor@sysoev.ru>
parents: 860
diff changeset
197 NGX_FILE_DEFAULT_ACCESS);
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
198
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
199 if (mtx->fd == NGX_INVALID_FILE) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 611
diff changeset
200 ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, ngx_errno,
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
201 ngx_open_file_n " \"%s\" failed", name);
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
202 return NGX_ERROR;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
203 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
204
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
205 if (ngx_delete_file(name) == NGX_FILE_ERROR) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 611
diff changeset
206 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
207 ngx_delete_file_n " \"%s\" failed", name);
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
208 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
209
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
210 mtx->name = name;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
211
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
212 return NGX_OK;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
213 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
214
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
215
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
216 void
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
217 ngx_shmtx_destory(ngx_shmtx_t *mtx)
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
218 {
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
219 if (ngx_close_file(mtx->fd) == NGX_FILE_ERROR) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 611
diff changeset
220 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
221 ngx_close_file_n " \"%s\" failed", mtx->name);
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
222 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
223 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
224
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
225
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
226 ngx_uint_t
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
227 ngx_shmtx_trylock(ngx_shmtx_t *mtx)
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
228 {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
229 ngx_err_t err;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
230
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
231 err = ngx_trylock_fd(mtx->fd);
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
232
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
233 if (err == 0) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
234 return 1;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
235 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
236
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
237 if (err == NGX_EAGAIN) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
238 return 0;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
239 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
240
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
241 #if __osf__ /* Tru64 UNIX */
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
242
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
243 if (err == NGX_EACCESS) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
244 return 0;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
245 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
246
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
247 #endif
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
248
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
249 ngx_log_abort(err, ngx_trylock_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
250
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
251 return 0;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
252 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
253
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
254
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
255 void
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
256 ngx_shmtx_lock(ngx_shmtx_t *mtx)
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
257 {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
258 ngx_err_t err;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
259
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
260 err = ngx_lock_fd(mtx->fd);
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
261
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
262 if (err == 0) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
263 return;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
264 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
265
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
266 ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name);
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
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parents: 1100
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267 }
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268
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269
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270 void
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271 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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272 {
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273 ngx_err_t err;
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274
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275 err = ngx_unlock_fd(mtx->fd);
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276
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277 if (err == 0) {
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278 return;
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279 }
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280
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281 ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name);
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282 }
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283
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284 #endif