Mercurial > hg > nginx-quic
annotate src/core/ngx_shmtx.h @ 7312:54683f650cbd
Resolver: retry sending queries on errors (ticket #1511).
Errors when sending UDP datagrams can happen, e.g., when local IP address
changes (see fa0e093b64d7), or an unavailable DNS server on the LAN can cause
send() to fail with EHOSTDOWN on BSD systems. If this happens during
initial query, retry sending immediately, to a different DNS server when
possible. If this is not enough, allow normal resend to happen by ignoring
the return code of the second ngx_resolver_send_query() call, much like we
do in ngx_resolver_resend().
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Thu, 05 Jul 2018 22:21:14 +0300 |
parents | 512c741fa841 |
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rev | line source |
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611 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
611 | 5 */ |
6 | |
7 | |
8 #ifndef _NGX_SHMTX_H_INCLUDED_ | |
9 #define _NGX_SHMTX_H_INCLUDED_ | |
10 | |
11 | |
12 #include <ngx_config.h> | |
13 #include <ngx_core.h> | |
14 | |
15 | |
16 typedef struct { | |
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17 ngx_atomic_t lock; |
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18 #if (NGX_HAVE_POSIX_SEM) |
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19 ngx_atomic_t wait; |
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20 #endif |
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parents:
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21 } ngx_shmtx_sh_t; |
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Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
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22 |
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Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3909
diff
changeset
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23 |
3f6040cd731e
Added shmtx interface to forcibly unlock mutexes.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3909
diff
changeset
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24 typedef struct { |
611 | 25 #if (NGX_HAVE_ATOMIC_OPS) |
26 ngx_atomic_t *lock; | |
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Igor Sysoev <igor@sysoev.ru>
parents:
2563
diff
changeset
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27 #if (NGX_HAVE_POSIX_SEM) |
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Maxim Dounin <mdounin@mdounin.ru>
parents:
3909
diff
changeset
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28 ngx_atomic_t *wait; |
3909
0daede16d68b
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Igor Sysoev <igor@sysoev.ru>
parents:
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29 ngx_uint_t semaphore; |
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parents:
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30 sem_t sem; |
0daede16d68b
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Igor Sysoev <igor@sysoev.ru>
parents:
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31 #endif |
611 | 32 #else |
33 ngx_fd_t fd; | |
34 u_char *name; | |
35 #endif | |
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Igor Sysoev <igor@sysoev.ru>
parents:
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36 ngx_uint_t spin; |
611 | 37 } ngx_shmtx_t; |
38 | |
39 | |
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40 ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, |
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Maxim Dounin <mdounin@mdounin.ru>
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41 u_char *name); |
4738
512c741fa841
Fixed typo in a function name.
Ruslan Ermilov <ru@nginx.com>
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42 void ngx_shmtx_destroy(ngx_shmtx_t *mtx); |
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Igor Sysoev <igor@sysoev.ru>
parents:
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43 ngx_uint_t ngx_shmtx_trylock(ngx_shmtx_t *mtx); |
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Igor Sysoev <igor@sysoev.ru>
parents:
2563
diff
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44 void ngx_shmtx_lock(ngx_shmtx_t *mtx); |
0daede16d68b
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Igor Sysoev <igor@sysoev.ru>
parents:
2563
diff
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45 void ngx_shmtx_unlock(ngx_shmtx_t *mtx); |
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Maxim Dounin <mdounin@mdounin.ru>
parents:
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46 ngx_uint_t ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid); |
611 | 47 |
48 | |
49 #endif /* _NGX_SHMTX_H_INCLUDED_ */ |