Mercurial > hg > nginx
annotate src/misc/ngx_google_perftools_module.c @ 8045: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 | a27e0c7e198c |
children |
rev | line source |
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1949 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
1949 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 /* | |
3478
eb8660fecc12
fix a comment and a style fix
Igor Sysoev <igor@sysoev.ru>
parents:
1949
diff
changeset
|
12 * declare Profiler interface here because |
1949 | 13 * <google/profiler.h> is C++ header file |
14 */ | |
15 | |
16 int ProfilerStart(u_char* fname); | |
17 void ProfilerStop(void); | |
18 void ProfilerRegisterThread(void); | |
19 | |
20 | |
21 static void *ngx_google_perftools_create_conf(ngx_cycle_t *cycle); | |
22 static ngx_int_t ngx_google_perftools_worker(ngx_cycle_t *cycle); | |
23 | |
24 | |
25 typedef struct { | |
26 ngx_str_t profiles; | |
27 } ngx_google_perftools_conf_t; | |
28 | |
29 | |
30 static ngx_command_t ngx_google_perftools_commands[] = { | |
31 | |
32 { ngx_string("google_perftools_profiles"), | |
33 NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1, | |
34 ngx_conf_set_str_slot, | |
35 0, | |
36 offsetof(ngx_google_perftools_conf_t, profiles), | |
37 NULL }, | |
38 | |
7066
a27e0c7e198c
Style: aligned ngx_null_command.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
|
39 ngx_null_command |
1949 | 40 }; |
41 | |
42 | |
43 static ngx_core_module_t ngx_google_perftools_module_ctx = { | |
44 ngx_string("google_perftools"), | |
45 ngx_google_perftools_create_conf, | |
46 NULL | |
47 }; | |
48 | |
49 | |
50 ngx_module_t ngx_google_perftools_module = { | |
51 NGX_MODULE_V1, | |
52 &ngx_google_perftools_module_ctx, /* module context */ | |
53 ngx_google_perftools_commands, /* module directives */ | |
54 NGX_CORE_MODULE, /* module type */ | |
55 NULL, /* init master */ | |
56 NULL, /* init module */ | |
57 ngx_google_perftools_worker, /* init process */ | |
58 NULL, /* init thread */ | |
59 NULL, /* exit thread */ | |
60 NULL, /* exit process */ | |
61 NULL, /* exit master */ | |
62 NGX_MODULE_V1_PADDING | |
63 }; | |
64 | |
65 | |
66 static void * | |
67 ngx_google_perftools_create_conf(ngx_cycle_t *cycle) | |
68 { | |
69 ngx_google_perftools_conf_t *gptcf; | |
70 | |
71 gptcf = ngx_pcalloc(cycle->pool, sizeof(ngx_google_perftools_conf_t)); | |
72 if (gptcf == NULL) { | |
73 return NULL; | |
74 } | |
75 | |
76 /* | |
3480 | 77 * set by ngx_pcalloc() |
1949 | 78 * |
79 * gptcf->profiles = { 0, NULL }; | |
80 */ | |
81 | |
82 return gptcf; | |
83 } | |
84 | |
85 | |
86 static ngx_int_t | |
87 ngx_google_perftools_worker(ngx_cycle_t *cycle) | |
88 { | |
89 u_char *profile; | |
90 ngx_google_perftools_conf_t *gptcf; | |
91 | |
92 gptcf = (ngx_google_perftools_conf_t *) | |
93 ngx_get_conf(cycle->conf_ctx, ngx_google_perftools_module); | |
94 | |
95 if (gptcf->profiles.len == 0) { | |
96 return NGX_OK; | |
97 } | |
98 | |
99 profile = ngx_alloc(gptcf->profiles.len + NGX_INT_T_LEN + 2, cycle->log); | |
100 if (profile == NULL) { | |
101 return NGX_OK; | |
102 } | |
103 | |
104 if (getenv("CPUPROFILE")) { | |
105 /* disable inherited Profiler enabled in master process */ | |
106 ProfilerStop(); | |
107 } | |
108 | |
109 ngx_sprintf(profile, "%V.%d%Z", &gptcf->profiles, ngx_pid); | |
110 | |
111 if (ProfilerStart(profile)) { | |
112 /* start ITIMER_PROF timer */ | |
113 ProfilerRegisterThread(); | |
114 | |
115 } else { | |
116 ngx_log_error(NGX_LOG_CRIT, cycle->log, ngx_errno, | |
117 "ProfilerStart(%s) failed", profile); | |
118 } | |
119 | |
120 ngx_free(profile); | |
121 | |
122 return NGX_OK; | |
123 } | |
124 | |
125 | |
126 /* ProfilerStop() is called on Profiler destruction */ |