Mercurial > hg > nginx-quic
annotate auto/feature @ 8896:aa28c802409f
Resolver: make TCP write timer event cancelable.
Similar to 70e65bf8dfd7, the change is made to ensure that the ability to
cancel resolver tasks is fully controlled by the caller. As mentioned in the
referenced commit, it is safe to make this timer cancelable because resolve
tasks can have their own timeouts that are not cancelable.
The scenario where this may become a problem is a periodic background resolve
task (not tied to a specific request or a client connection), which receives a
response with short TTL, large enough to warrant fallback to a TCP query.
With each event loop wakeup, we either have a previously set write timer
instance or schedule a new one. The non-cancelable write timer can delay or
block graceful shutdown of a worker even if the ngx_resolver_ctx_t->cancelable
flag is set by the API user, and there are no other tasks or connections.
We use the resolver API in this way to maintain the list of upstream server
addresses specified with the 'resolve' parameter, and there could be third-party
modules implementing similar logic.
author | Aleksei Bavshin <a.bavshin@f5.com> |
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date | Wed, 01 Jun 2022 20:17:23 -0700 |
parents | e3faa5fb7772 |
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rev | line source |
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2 # Copyright (C) Igor Sysoev |
4412 | 3 # Copyright (C) Nginx, Inc. |
444
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5 |
455 | 6 echo $ngx_n "checking for $ngx_feature ...$ngx_c" |
7 | |
8 cat << END >> $NGX_AUTOCONF_ERR | |
9 | |
10 ---------------------------------------- | |
11 checking for $ngx_feature | |
12 | |
13 END | |
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15 ngx_found=no |
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16 |
455 | 17 if test -n "$ngx_feature_name"; then |
645 | 18 ngx_have_feature=`echo $ngx_feature_name \ |
19 | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ` | |
455 | 20 fi |
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21 |
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22 if test -n "$ngx_feature_path"; then |
2139 | 23 for ngx_temp in $ngx_feature_path; do |
24 ngx_feature_inc_path="$ngx_feature_inc_path -I $ngx_temp" | |
25 done | |
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26 fi |
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27 |
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28 cat << END > $NGX_AUTOTEST.c |
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29 |
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30 #include <sys/types.h> |
455 | 31 $NGX_INCLUDE_UNISTD_H |
32 $ngx_feature_incs | |
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34 int main(void) { |
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35 $ngx_feature_test; |
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36 return 0; |
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37 } |
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38 |
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39 END |
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40 |
455 | 41 |
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42 ngx_test="$CC $CC_TEST_FLAGS $CC_AUX_FLAGS $ngx_feature_inc_path \ |
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43 -o $NGX_AUTOTEST $NGX_AUTOTEST.c $NGX_TEST_LD_OPT $ngx_feature_libs" |
461 | 44 |
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45 ngx_feature_inc_path= |
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46 |
946 | 47 eval "/bin/sh -c \"$ngx_test\" >> $NGX_AUTOCONF_ERR 2>&1" |
455 | 48 |
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49 |
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50 if [ -x $NGX_AUTOTEST ]; then |
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51 |
619 | 52 case "$ngx_feature_run" in |
53 | |
54 yes) | |
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55 # /bin/sh is used to intercept "Killed" or "Abort trap" messages |
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56 if /bin/sh -c $NGX_AUTOTEST >> $NGX_AUTOCONF_ERR 2>&1; then |
619 | 57 echo " found" |
58 ngx_found=yes | |
455 | 59 |
619 | 60 if test -n "$ngx_feature_name"; then |
61 have=$ngx_have_feature . auto/have | |
62 fi | |
455 | 63 |
619 | 64 else |
65 echo " found but is not working" | |
66 fi | |
67 ;; | |
68 | |
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69 value) |
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70 # /bin/sh is used to intercept "Killed" or "Abort trap" messages |
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71 if /bin/sh -c $NGX_AUTOTEST >> $NGX_AUTOCONF_ERR 2>&1; then |
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72 echo " found" |
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73 ngx_found=yes |
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74 |
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75 cat << END >> $NGX_AUTO_CONFIG_H |
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76 |
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77 #ifndef $ngx_feature_name |
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78 #define $ngx_feature_name `$NGX_AUTOTEST` |
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79 #endif |
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80 |
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81 END |
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82 else |
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83 echo " found but is not working" |
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84 fi |
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85 ;; |
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86 |
619 | 87 bug) |
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88 # /bin/sh is used to intercept "Killed" or "Abort trap" messages |
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89 if /bin/sh -c $NGX_AUTOTEST >> $NGX_AUTOCONF_ERR 2>&1; then |
619 | 90 echo " not found" |
455 | 91 |
619 | 92 else |
93 echo " found" | |
94 ngx_found=yes | |
95 | |
96 if test -n "$ngx_feature_name"; then | |
97 have=$ngx_have_feature . auto/have | |
98 fi | |
99 fi | |
100 ;; | |
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101 |
619 | 102 *) |
103 echo " found" | |
104 ngx_found=yes | |
455 | 105 |
619 | 106 if test -n "$ngx_feature_name"; then |
107 have=$ngx_have_feature . auto/have | |
108 fi | |
109 ;; | |
455 | 110 |
619 | 111 esac |
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112 |
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113 else |
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114 echo " not found" |
455 | 115 |
116 echo "----------" >> $NGX_AUTOCONF_ERR | |
117 cat $NGX_AUTOTEST.c >> $NGX_AUTOCONF_ERR | |
118 echo "----------" >> $NGX_AUTOCONF_ERR | |
119 echo $ngx_test >> $NGX_AUTOCONF_ERR | |
120 echo "----------" >> $NGX_AUTOCONF_ERR | |
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121 fi |
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122 |
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123 rm -rf $NGX_AUTOTEST* |