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