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annotate src/core/ngx_shmtx.c @ 7660:d33e17499088

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Version bump.
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 26 May 2020 22:03:00 +0300
parents 860a1c37f3b2
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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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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12 #if (NGX_HAVE_ATOMIC_OPS)
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14
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15 static void ngx_shmtx_wakeup(ngx_shmtx_t *mtx);
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16
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17
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18 ngx_int_t
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19 ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name)
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20 {
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21 mtx->lock = &addr->lock;
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22
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23 if (mtx->spin == (ngx_uint_t) -1) {
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24 return NGX_OK;
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25 }
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26
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27 mtx->spin = 2048;
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28
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29 #if (NGX_HAVE_POSIX_SEM)
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30
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31 mtx->wait = &addr->wait;
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32
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33 if (sem_init(&mtx->sem, 1, 0) == -1) {
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34 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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35 "sem_init() failed");
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36 } else {
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37 mtx->semaphore = 1;
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38 }
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39
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40 #endif
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41
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42 return NGX_OK;
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43 }
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44
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46 void
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47 ngx_shmtx_destroy(ngx_shmtx_t *mtx)
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48 {
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49 #if (NGX_HAVE_POSIX_SEM)
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50
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51 if (mtx->semaphore) {
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52 if (sem_destroy(&mtx->sem) == -1) {
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53 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno,
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54 "sem_destroy() failed");
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55 }
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56 }
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57
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58 #endif
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59 }
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60
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61
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62 ngx_uint_t
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63 ngx_shmtx_trylock(ngx_shmtx_t *mtx)
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64 {
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65 return (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid));
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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
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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 if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) {
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79 return;
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80 }
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81
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82 if (ngx_ncpu > 1) {
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83
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84 for (n = 1; n < mtx->spin; n <<= 1) {
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85
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86 for (i = 0; i < n; i++) {
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87 ngx_cpu_pause();
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88 }
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89
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90 if (*mtx->lock == 0
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91 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid))
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92 {
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93 return;
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94 }
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95 }
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96 }
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97
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98 #if (NGX_HAVE_POSIX_SEM)
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99
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100 if (mtx->semaphore) {
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101 (void) ngx_atomic_fetch_add(mtx->wait, 1);
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102
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103 if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) {
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104 (void) ngx_atomic_fetch_add(mtx->wait, -1);
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105 return;
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106 }
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107
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108 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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109 "shmtx wait %uA", *mtx->wait);
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110
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111 while (sem_wait(&mtx->sem) == -1) {
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112 ngx_err_t err;
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113
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114 err = ngx_errno;
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115
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116 if (err != NGX_EINTR) {
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117 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
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118 "sem_wait() failed while waiting on shmtx");
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119 break;
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120 }
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121 }
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122
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123 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
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124 "shmtx awoke");
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125
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126 continue;
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127 }
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128
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129 #endif
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Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
130
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
131 ngx_sched_yield();
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
132 }
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
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
136 void
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
137 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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 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
140 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx unlock");
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
4309
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
143 if (ngx_atomic_cmp_set(mtx->lock, ngx_pid, 0)) {
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
144 ngx_shmtx_wakeup(mtx);
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
145 }
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
146 }
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
147
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
148
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
149 ngx_uint_t
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
150 ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid)
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
151 {
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
152 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
153 "shmtx forced unlock");
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
154
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
155 if (ngx_atomic_cmp_set(mtx->lock, pid, 0)) {
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
156 ngx_shmtx_wakeup(mtx);
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
157 return 1;
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
158 }
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
159
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
160 return 0;
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
161 }
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
162
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
163
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
164 static void
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
165 ngx_shmtx_wakeup(ngx_shmtx_t *mtx)
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
166 {
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
167 #if (NGX_HAVE_POSIX_SEM)
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
168 ngx_atomic_uint_t wait;
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
169
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
170 if (!mtx->semaphore) {
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
171 return;
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
172 }
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
173
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
174 for ( ;; ) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
175
4309
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
176 wait = *mtx->wait;
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
177
5970
74edc0ccf27a Core: fixed a race resulting in extra sem_post()'s.
Roman Arutyunyan <arut@nginx.com>
parents: 4932
diff changeset
178 if ((ngx_atomic_int_t) wait <= 0) {
4309
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
179 return;
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
180 }
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
181
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
182 if (ngx_atomic_cmp_set(mtx->wait, wait, wait - 1)) {
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
183 break;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
184 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
185 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
186
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
187 ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
4309
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
188 "shmtx wake %uA", wait);
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
189
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
190 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
191 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
192 "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
193 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
194
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
195 #endif
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
196 }
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
197
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
198
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
199 #else
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
200
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
201
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
202 ngx_int_t
4309
3f6040cd731e Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents: 3909
diff changeset
203 ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name)
611
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 (mtx->name) {
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
206
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
207 if (ngx_strcmp(name, mtx->name) == 0) {
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
208 mtx->name = name;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
209 return NGX_OK;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
210 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
211
4738
512c741fa841 Fixed typo in a function name.
Ruslan Ermilov <ru@nginx.com>
parents: 4412
diff changeset
212 ngx_shmtx_destroy(mtx);
611
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
1100
01884449985f fix building on platforms with non-supported atomic operations
Igor Sysoev <igor@sysoev.ru>
parents: 860
diff changeset
215 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
216 NGX_FILE_DEFAULT_ACCESS);
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
217
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
218 if (mtx->fd == NGX_INVALID_FILE) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 611
diff changeset
219 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
220 ngx_open_file_n " \"%s\" failed", name);
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
221 return NGX_ERROR;
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 if (ngx_delete_file(name) == NGX_FILE_ERROR) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 611
diff changeset
225 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
226 ngx_delete_file_n " \"%s\" failed", name);
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
227 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
228
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
229 mtx->name = name;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
230
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
231 return NGX_OK;
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
232 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
233
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
234
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
235 void
4738
512c741fa841 Fixed typo in a function name.
Ruslan Ermilov <ru@nginx.com>
parents: 4412
diff changeset
236 ngx_shmtx_destroy(ngx_shmtx_t *mtx)
611
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
237 {
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
238 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
239 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
240 ngx_close_file_n " \"%s\" failed", mtx->name);
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
241 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
242 }
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
243
3f8a2132b93d nginx-0.3.27-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
244
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
245 ngx_uint_t
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
246 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
247 {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
248 ngx_err_t err;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
249
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
250 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
251
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
252 if (err == 0) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
253 return 1;
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
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
256 if (err == NGX_EAGAIN) {
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
257 return 0;
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
258 }
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 #if __osf__ /* Tru64 UNIX */
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
261
5972
860a1c37f3b2 Core: fixed build on Tru64 UNIX.
Sergey Kandaurov <pluknet@nginx.com>
parents: 5970
diff changeset
262 if (err == NGX_EACCES) {
3909
0daede16d68b use POSIX semaphores in shmtx instead of sched_yield()
Igor Sysoev <igor@sysoev.ru>
parents: 1100
diff changeset
263 return 0;
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264 }
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265
611
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266 #endif
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267
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268 ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name);
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269
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270 return 0;
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271 }
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272
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273
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274 void
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275 ngx_shmtx_lock(ngx_shmtx_t *mtx)
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276 {
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277 ngx_err_t err;
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278
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279 err = ngx_lock_fd(mtx->fd);
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280
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281 if (err == 0) {
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282 return;
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283 }
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284
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285 ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name);
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286 }
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287
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288
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289 void
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290 ngx_shmtx_unlock(ngx_shmtx_t *mtx)
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291 {
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292 ngx_err_t err;
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293
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294 err = ngx_unlock_fd(mtx->fd);
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295
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296 if (err == 0) {
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297 return;
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298 }
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299
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300 ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name);
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301 }
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302
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303
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304 ngx_uint_t
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305 ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid)
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306 {
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307 return 0;
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308 }
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309
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310 #endif