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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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#if (NGX_TEST_BUILD_RTSIG)
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#if (NGX_DARWIN)
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#define SIGRTMIN 33
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#define si_fd __pad[0]
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#else
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#ifdef SIGRTMIN
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#define si_fd _reason.__spare__.__spare2__[0]
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#else
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#define SIGRTMIN 33
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#define si_fd __spare__[0]
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#endif
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#endif
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#define F_SETSIG 10
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#define KERN_RTSIGNR 30
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#define KERN_RTSIGMAX 31
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int sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec *timeout);
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int sigtimedwait(const sigset_t *set, siginfo_t *info,
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const struct timespec *timeout)
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{
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return -1;
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}
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int ngx_linux_rtsig_max;
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#endif
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typedef struct {
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ngx_uint_t signo;
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ngx_uint_t overflow_events;
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ngx_uint_t overflow_test;
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ngx_uint_t overflow_threshold;
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} ngx_rtsig_conf_t;
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extern ngx_event_module_t ngx_poll_module_ctx;
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static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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static void ngx_rtsig_done(ngx_cycle_t *cycle);
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static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
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static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c,
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ngx_uint_t flags);
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static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle,
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ngx_msec_t timer, ngx_uint_t flags);
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static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle,
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ngx_msec_t timer, ngx_uint_t flags);
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static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
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static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
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static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
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void *post, void *data);
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static sigset_t set;
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static ngx_uint_t overflow, overflow_current;
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static struct pollfd *overflow_list;
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static ngx_str_t rtsig_name = ngx_string("rtsig");
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static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
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ngx_check_ngx_overflow_threshold_bounds, 2, 10
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};
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| 85 | |
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static ngx_command_t ngx_rtsig_commands[] = {
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{ ngx_string("rtsig_signo"),
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NGX_EVENT_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_num_slot,
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0,
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offsetof(ngx_rtsig_conf_t, signo),
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NULL },
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{ ngx_string("rtsig_overflow_events"),
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NGX_EVENT_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_num_slot,
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0,
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offsetof(ngx_rtsig_conf_t, overflow_events),
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NULL },
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{ ngx_string("rtsig_overflow_test"),
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NGX_EVENT_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_num_slot,
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0,
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offsetof(ngx_rtsig_conf_t, overflow_test),
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NULL },
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{ ngx_string("rtsig_overflow_threshold"),
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NGX_EVENT_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_num_slot,
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0,
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offsetof(ngx_rtsig_conf_t, overflow_threshold),
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&ngx_overflow_threshold_bounds },
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ngx_null_command
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};
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ngx_event_module_t ngx_rtsig_module_ctx = {
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&rtsig_name,
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ngx_rtsig_create_conf, /* create configuration */
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ngx_rtsig_init_conf, /* init configuration */
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{
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NULL, /* add an event */
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NULL, /* delete an event */
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NULL, /* enable an event */
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NULL, /* disable an event */
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ngx_rtsig_add_connection, /* add an connection */
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ngx_rtsig_del_connection, /* delete an connection */
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NULL, /* trigger a notify */
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ngx_rtsig_process_events, /* process the events */
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ngx_rtsig_init, /* init the events */
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ngx_rtsig_done, /* done the events */
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}
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};
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ngx_module_t ngx_rtsig_module = {
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NGX_MODULE_V1,
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&ngx_rtsig_module_ctx, /* module context */
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ngx_rtsig_commands, /* module directives */
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NGX_EVENT_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_int_t
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ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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{
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ngx_rtsig_conf_t *rtscf;
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rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
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sigemptyset(&set);
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sigaddset(&set, (int) rtscf->signo);
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sigaddset(&set, (int) rtscf->signo + 1);
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sigaddset(&set, SIGIO);
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sigaddset(&set, SIGALRM);
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if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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"sigprocmask() failed");
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return NGX_ERROR;
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}
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if (overflow_list) {
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ngx_free(overflow_list);
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}
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overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
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cycle->log);
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if (overflow_list == NULL) {
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return NGX_ERROR;
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}
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ngx_io = ngx_os_io;
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ngx_event_actions = ngx_rtsig_module_ctx.actions;
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ngx_event_flags = NGX_USE_RTSIG_EVENT
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|NGX_USE_GREEDY_EVENT
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|NGX_USE_FD_EVENT;
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return NGX_OK;
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}
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static void
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ngx_rtsig_done(ngx_cycle_t *cycle)
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{
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ngx_free(overflow_list);
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overflow_list = NULL;
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}
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static ngx_int_t
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ngx_rtsig_add_connection(ngx_connection_t *c)
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{
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ngx_uint_t signo;
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ngx_rtsig_conf_t *rtscf;
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if (c->read->accept && c->read->disabled) {
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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"rtsig enable connection: fd:%d", c->fd);
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if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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"fcntl(F_SETOWN) failed");
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return NGX_ERROR;
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}
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| 222 | |
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c->read->active = 1;
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c->read->disabled = 0;
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}
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rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
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signo = rtscf->signo + c->read->instance;
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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"rtsig add connection: fd:%d signo:%ui", c->fd, signo);
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| 233 | |
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if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
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ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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"fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
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| 237 | |
return NGX_ERROR;
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}
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| 239 | |
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| 240 | |
if (fcntl(c->fd, F_SETSIG, (int) signo) == -1) {
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| 241 | |
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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| 242 | |
"fcntl(F_SETSIG) failed");
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| 243 | |
return NGX_ERROR;
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| 244 | |
}
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| 245 | |
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| 246 | |
if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
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| 247 | |
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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| 248 | |
"fcntl(F_SETOWN) failed");
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| 249 | |
return NGX_ERROR;
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| 250 | |
}
|
| 251 | |
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| 252 | |
#if (NGX_HAVE_ONESIGFD)
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| 253 | |
if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
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| 254 | |
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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| 255 | |
"fcntl(F_SETAUXFL) failed");
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| 256 | |
return NGX_ERROR;
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| 257 | |
}
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| 258 | |
#endif
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| 259 | |
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| 260 | |
c->read->active = 1;
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| 261 | |
c->write->active = 1;
|
| 262 | |
|
| 263 | |
return NGX_OK;
|
| 264 | |
}
|
| 265 | |
|
| 266 | |
|
| 267 | |
static ngx_int_t
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| 268 | |
ngx_rtsig_del_connection(ngx_connection_t *c, ngx_uint_t flags)
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| 269 | |
{
|
| 270 | |
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
| 271 | |
"rtsig del connection: fd:%d", c->fd);
|
| 272 | |
|
| 273 | |
if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
|
| 274 | |
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| 275 | |
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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| 276 | |
"rtsig disable connection: fd:%d", c->fd);
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| 277 | |
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| 278 | |
c->read->active = 0;
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| 279 | |
c->read->disabled = 1;
|
| 280 | |
return NGX_OK;
|
| 281 | |
}
|
| 282 | |
|
| 283 | |
if (flags & NGX_CLOSE_EVENT) {
|
| 284 | |
c->read->active = 0;
|
| 285 | |
c->write->active = 0;
|
| 286 | |
return NGX_OK;
|
| 287 | |
}
|
| 288 | |
|
| 289 | |
if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
|
| 290 | |
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
|
| 291 | |
"fcntl(O_RDWR|O_NONBLOCK) failed");
|
| 292 | |
return NGX_ERROR;
|
| 293 | |
}
|
| 294 | |
|
| 295 | |
c->read->active = 0;
|
| 296 | |
c->write->active = 0;
|
| 297 | |
|
| 298 | |
return NGX_OK;
|
| 299 | |
}
|
| 300 | |
|
| 301 | |
|
| 302 | |
static ngx_int_t
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| 303 | |
ngx_rtsig_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
|
| 304 | |
{
|
| 305 | |
int signo;
|
| 306 | |
ngx_int_t instance;
|
| 307 | |
ngx_err_t err;
|
| 308 | |
siginfo_t si;
|
| 309 | |
ngx_event_t *rev, *wev;
|
| 310 | |
ngx_queue_t *queue;
|
| 311 | |
struct timespec ts, *tp;
|
| 312 | |
struct sigaction sa;
|
| 313 | |
ngx_connection_t *c;
|
| 314 | |
ngx_rtsig_conf_t *rtscf;
|
| 315 | |
|
| 316 | |
if (timer == NGX_TIMER_INFINITE) {
|
| 317 | |
tp = NULL;
|
| 318 | |
|
| 319 | |
} else {
|
| 320 | |
ts.tv_sec = timer / 1000;
|
| 321 | |
ts.tv_nsec = (timer % 1000) * 1000000;
|
| 322 | |
tp = &ts;
|
| 323 | |
}
|
| 324 | |
|
| 325 | |
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
| 326 | |
"rtsig timer: %M", timer);
|
| 327 | |
|
| 328 | |
/* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
|
| 329 | |
|
| 330 | |
signo = sigtimedwait(&set, &si, tp);
|
| 331 | |
|
| 332 | |
if (signo == -1) {
|
| 333 | |
err = ngx_errno;
|
| 334 | |
|
| 335 | |
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
|
| 336 | |
"rtsig signo:%d", signo);
|
| 337 | |
|
| 338 | |
if (flags & NGX_UPDATE_TIME) {
|
| 339 | |
ngx_time_update();
|
| 340 | |
}
|
| 341 | |
|
| 342 | |
if (err == NGX_EAGAIN) {
|
| 343 | |
|
| 344 | |
/* timeout */
|
| 345 | |
|
| 346 | |
if (timer != NGX_TIMER_INFINITE) {
|
| 347 | |
return NGX_AGAIN;
|
| 348 | |
}
|
| 349 | |
|
| 350 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
| 351 | |
"sigtimedwait() returned EAGAIN without timeout");
|
| 352 | |
return NGX_ERROR;
|
| 353 | |
}
|
| 354 | |
|
| 355 | |
ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
| 356 | |
cycle->log, err, "sigtimedwait() failed");
|
| 357 | |
return NGX_ERROR;
|
| 358 | |
}
|
| 359 | |
|
| 360 | |
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
| 361 | |
"rtsig signo:%d fd:%d band:%04Xd",
|
| 362 | |
signo, si.si_fd, si.si_band);
|
| 363 | |
|
| 364 | |
if (flags & NGX_UPDATE_TIME) {
|
| 365 | |
ngx_time_update();
|
| 366 | |
}
|
| 367 | |
|
| 368 | |
rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
| 369 | |
|
| 370 | |
if (signo == (int) rtscf->signo || signo == (int) rtscf->signo + 1) {
|
| 371 | |
|
| 372 | |
if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
|
| 373 | |
return NGX_OK;
|
| 374 | |
}
|
| 375 | |
|
| 376 | |
c = ngx_cycle->files[si.si_fd];
|
| 377 | |
|
| 378 | |
if (c == NULL) {
|
| 379 | |
|
| 380 | |
/* the stale event */
|
| 381 | |
|
| 382 | |
return NGX_OK;
|
| 383 | |
}
|
| 384 | |
|
| 385 | |
instance = signo - (int) rtscf->signo;
|
| 386 | |
|
| 387 | |
rev = c->read;
|
| 388 | |
|
| 389 | |
if (rev->instance != instance) {
|
| 390 | |
|
| 391 | |
/*
|
| 392 | |
* the stale event from a file descriptor
|
| 393 | |
* that was just closed in this iteration
|
| 394 | |
*/
|
| 395 | |
|
| 396 | |
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
| 397 | |
"rtsig: stale event %p", c);
|
| 398 | |
|
| 399 | |
return NGX_OK;
|
| 400 | |
}
|
| 401 | |
|
| 402 | |
if ((si.si_band & (POLLIN|POLLHUP|POLLERR)) && rev->active) {
|
| 403 | |
|
| 404 | |
rev->ready = 1;
|
| 405 | |
|
| 406 | |
if (flags & NGX_POST_EVENTS) {
|
| 407 | |
queue = rev->accept ? &ngx_posted_accept_events
|
| 408 | |
: &ngx_posted_events;
|
| 409 | |
|
| 410 | |
ngx_post_event(rev, queue);
|
| 411 | |
|
| 412 | |
} else {
|
| 413 | |
rev->handler(rev);
|
| 414 | |
}
|
| 415 | |
}
|
| 416 | |
|
| 417 | |
wev = c->write;
|
| 418 | |
|
| 419 | |
if ((si.si_band & (POLLOUT|POLLHUP|POLLERR)) && wev->active) {
|
| 420 | |
|
| 421 | |
wev->ready = 1;
|
| 422 | |
|
| 423 | |
if (flags & NGX_POST_EVENTS) {
|
| 424 | |
ngx_post_event(wev, &ngx_posted_events);
|
| 425 | |
|
| 426 | |
} else {
|
| 427 | |
wev->handler(wev);
|
| 428 | |
}
|
| 429 | |
}
|
| 430 | |
|
| 431 | |
return NGX_OK;
|
| 432 | |
|
| 433 | |
} else if (signo == SIGALRM) {
|
| 434 | |
|
| 435 | |
ngx_time_update();
|
| 436 | |
|
| 437 | |
return NGX_OK;
|
| 438 | |
|
| 439 | |
} else if (signo == SIGIO) {
|
| 440 | |
|
| 441 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
| 442 | |
"rt signal queue overflowed");
|
| 443 | |
|
| 444 | |
/* flush the RT signal queue */
|
| 445 | |
|
| 446 | |
ngx_memzero(&sa, sizeof(struct sigaction));
|
| 447 | |
sa.sa_handler = SIG_DFL;
|
| 448 | |
sigemptyset(&sa.sa_mask);
|
| 449 | |
|
| 450 | |
if (sigaction(rtscf->signo, &sa, NULL) == -1) {
|
| 451 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
| 452 | |
"sigaction(%d, SIG_DFL) failed", rtscf->signo);
|
| 453 | |
}
|
| 454 | |
|
| 455 | |
if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
|
| 456 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
|
| 457 | |
"sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
|
| 458 | |
}
|
| 459 | |
|
| 460 | |
overflow = 1;
|
| 461 | |
overflow_current = 0;
|
| 462 | |
ngx_event_actions.process_events = ngx_rtsig_process_overflow;
|
| 463 | |
|
| 464 | |
return NGX_ERROR;
|
| 465 | |
|
| 466 | |
}
|
| 467 | |
|
| 468 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
| 469 | |
"sigtimedwait() returned unexpected signal: %d", signo);
|
| 470 | |
|
| 471 | |
return NGX_ERROR;
|
| 472 | |
}
|
| 473 | |
|
| 474 | |
|
| 475 | |
static ngx_int_t
|
| 476 | |
ngx_rtsig_process_overflow(ngx_cycle_t *cycle, ngx_msec_t timer,
|
| 477 | |
ngx_uint_t flags)
|
| 478 | |
{
|
| 479 | |
int name[2], rtsig_max, rtsig_nr, events, ready;
|
| 480 | |
size_t len;
|
| 481 | |
ngx_err_t err;
|
| 482 | |
ngx_uint_t tested, n, i;
|
| 483 | |
ngx_event_t *rev, *wev;
|
| 484 | |
ngx_queue_t *queue;
|
| 485 | |
ngx_connection_t *c;
|
| 486 | |
ngx_rtsig_conf_t *rtscf;
|
| 487 | |
|
| 488 | |
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
| 489 | |
"rtsig process overflow");
|
| 490 | |
|
| 491 | |
rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
|
| 492 | |
|
| 493 | |
tested = 0;
|
| 494 | |
|
| 495 | |
for ( ;; ) {
|
| 496 | |
|
| 497 | |
n = 0;
|
| 498 | |
while (n < rtscf->overflow_events) {
|
| 499 | |
|
| 500 | |
if (overflow_current == cycle->connection_n) {
|
| 501 | |
break;
|
| 502 | |
}
|
| 503 | |
|
| 504 | |
c = cycle->files[overflow_current++];
|
| 505 | |
|
| 506 | |
if (c == NULL || c->fd == -1) {
|
| 507 | |
continue;
|
| 508 | |
}
|
| 509 | |
|
| 510 | |
events = 0;
|
| 511 | |
|
| 512 | |
if (c->read->active && c->read->handler) {
|
| 513 | |
events |= POLLIN;
|
| 514 | |
}
|
| 515 | |
|
| 516 | |
if (c->write->active && c->write->handler) {
|
| 517 | |
events |= POLLOUT;
|
| 518 | |
}
|
| 519 | |
|
| 520 | |
if (events == 0) {
|
| 521 | |
continue;
|
| 522 | |
}
|
| 523 | |
|
| 524 | |
overflow_list[n].fd = c->fd;
|
| 525 | |
overflow_list[n].events = events;
|
| 526 | |
overflow_list[n].revents = 0;
|
| 527 | |
n++;
|
| 528 | |
}
|
| 529 | |
|
| 530 | |
if (n == 0) {
|
| 531 | |
break;
|
| 532 | |
}
|
| 533 | |
|
| 534 | |
for ( ;; ) {
|
| 535 | |
ready = poll(overflow_list, n, 0);
|
| 536 | |
|
| 537 | |
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
| 538 | |
"rtsig overflow poll:%d", ready);
|
| 539 | |
|
| 540 | |
if (ready == -1) {
|
| 541 | |
err = ngx_errno;
|
| 542 | |
ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
| 543 | |
cycle->log, 0,
|
| 544 | |
"poll() failed while the overflow recover");
|
| 545 | |
|
| 546 | |
if (err == NGX_EINTR) {
|
| 547 | |
continue;
|
| 548 | |
}
|
| 549 | |
}
|
| 550 | |
|
| 551 | |
break;
|
| 552 | |
}
|
| 553 | |
|
| 554 | |
if (ready <= 0) {
|
| 555 | |
continue;
|
| 556 | |
}
|
| 557 | |
|
| 558 | |
for (i = 0; i < n; i++) {
|
| 559 | |
c = cycle->files[overflow_list[i].fd];
|
| 560 | |
|
| 561 | |
if (c == NULL) {
|
| 562 | |
continue;
|
| 563 | |
}
|
| 564 | |
|
| 565 | |
rev = c->read;
|
| 566 | |
|
| 567 | |
if (rev->active
|
| 568 | |
&& !rev->closed
|
| 569 | |
&& rev->handler
|
| 570 | |
&& (overflow_list[i].revents
|
| 571 | |
& (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
|
| 572 | |
{
|
| 573 | |
tested++;
|
| 574 | |
|
| 575 | |
rev->ready = 1;
|
| 576 | |
|
| 577 | |
if (flags & NGX_POST_EVENTS) {
|
| 578 | |
queue = rev->accept ? &ngx_posted_accept_events
|
| 579 | |
: &ngx_posted_events;
|
| 580 | |
|
| 581 | |
ngx_post_event(rev, queue);
|
| 582 | |
|
| 583 | |
} else {
|
| 584 | |
rev->handler(rev);
|
| 585 | |
}
|
| 586 | |
}
|
| 587 | |
|
| 588 | |
wev = c->write;
|
| 589 | |
|
| 590 | |
if (wev->active
|
| 591 | |
&& !wev->closed
|
| 592 | |
&& wev->handler
|
| 593 | |
&& (overflow_list[i].revents
|
| 594 | |
& (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
|
| 595 | |
{
|
| 596 | |
tested++;
|
| 597 | |
|
| 598 | |
wev->ready = 1;
|
| 599 | |
|
| 600 | |
if (flags & NGX_POST_EVENTS) {
|
| 601 | |
ngx_post_event(wev, &ngx_posted_events);
|
| 602 | |
|
| 603 | |
} else {
|
| 604 | |
wev->handler(wev);
|
| 605 | |
}
|
| 606 | |
}
|
| 607 | |
}
|
| 608 | |
|
| 609 | |
if (tested >= rtscf->overflow_test) {
|
| 610 | |
|
| 611 | |
if (ngx_linux_rtsig_max) {
|
| 612 | |
|
| 613 | |
/*
|
| 614 | |
* Check the current rt queue length to prevent
|
| 615 | |
* the new overflow.
|
| 616 | |
*
|
| 617 | |
* learn the "/proc/sys/kernel/rtsig-max" value because
|
| 618 | |
* it can be changed since the last checking
|
| 619 | |
*/
|
| 620 | |
|
| 621 | |
name[0] = CTL_KERN;
|
| 622 | |
name[1] = KERN_RTSIGMAX;
|
| 623 | |
len = sizeof(rtsig_max);
|
| 624 | |
|
| 625 | |
if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
|
| 626 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
| 627 | |
"sysctl(KERN_RTSIGMAX) failed");
|
| 628 | |
return NGX_ERROR;
|
| 629 | |
}
|
| 630 | |
|
| 631 | |
/* name[0] = CTL_KERN; */
|
| 632 | |
name[1] = KERN_RTSIGNR;
|
| 633 | |
len = sizeof(rtsig_nr);
|
| 634 | |
|
| 635 | |
if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
|
| 636 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
|
| 637 | |
"sysctl(KERN_RTSIGNR) failed");
|
| 638 | |
return NGX_ERROR;
|
| 639 | |
}
|
| 640 | |
|
| 641 | |
/*
|
| 642 | |
* drain the rt signal queue if the /"proc/sys/kernel/rtsig-nr"
|
| 643 | |
* is bigger than
|
| 644 | |
* "/proc/sys/kernel/rtsig-max" / "rtsig_overflow_threshold"
|
| 645 | |
*/
|
| 646 | |
|
| 647 | |
if (rtsig_max / (int) rtscf->overflow_threshold < rtsig_nr) {
|
| 648 | |
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
| 649 | |
"rtsig queue state: %d/%d",
|
| 650 | |
rtsig_nr, rtsig_max);
|
| 651 | |
while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK)
|
| 652 | |
{
|
| 653 | |
/* void */
|
| 654 | |
}
|
| 655 | |
}
|
| 656 | |
|
| 657 | |
} else {
|
| 658 | |
|
| 659 | |
/*
|
| 660 | |
* Linux has not KERN_RTSIGMAX since 2.6.6-mm2
|
| 661 | |
* so drain the rt signal queue unconditionally
|
| 662 | |
*/
|
| 663 | |
|
| 664 | |
while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK) {
|
| 665 | |
/* void */
|
| 666 | |
}
|
| 667 | |
}
|
| 668 | |
|
| 669 | |
tested = 0;
|
| 670 | |
}
|
| 671 | |
}
|
| 672 | |
|
| 673 | |
if (flags & NGX_UPDATE_TIME) {
|
| 674 | |
ngx_time_update();
|
| 675 | |
}
|
| 676 | |
|
| 677 | |
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
| 678 | |
"rt signal queue overflow recovered");
|
| 679 | |
|
| 680 | |
overflow = 0;
|
| 681 | |
ngx_event_actions.process_events = ngx_rtsig_process_events;
|
| 682 | |
|
| 683 | |
return NGX_OK;
|
| 684 | |
}
|
| 685 | |
|
| 686 | |
|
| 687 | |
static void *
|
| 688 | |
ngx_rtsig_create_conf(ngx_cycle_t *cycle)
|
| 689 | |
{
|
| 690 | |
ngx_rtsig_conf_t *rtscf;
|
| 691 | |
|
| 692 | |
rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
|
| 693 | |
if (rtscf == NULL) {
|
| 694 | |
return NULL;
|
| 695 | |
}
|
| 696 | |
|
| 697 | |
rtscf->signo = NGX_CONF_UNSET;
|
| 698 | |
rtscf->overflow_events = NGX_CONF_UNSET;
|
| 699 | |
rtscf->overflow_test = NGX_CONF_UNSET;
|
| 700 | |
rtscf->overflow_threshold = NGX_CONF_UNSET;
|
| 701 | |
|
| 702 | |
return rtscf;
|
| 703 | |
}
|
| 704 | |
|
| 705 | |
|
| 706 | |
static char *
|
| 707 | |
ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
|
| 708 | |
{
|
| 709 | |
ngx_rtsig_conf_t *rtscf = conf;
|
| 710 | |
|
| 711 | |
/* LinuxThreads use the first 3 RT signals */
|
| 712 | |
ngx_conf_init_uint_value(rtscf->signo, SIGRTMIN + 10);
|
| 713 | |
|
| 714 | |
ngx_conf_init_uint_value(rtscf->overflow_events, 16);
|
| 715 | |
ngx_conf_init_uint_value(rtscf->overflow_test, 32);
|
| 716 | |
ngx_conf_init_uint_value(rtscf->overflow_threshold, 10);
|
| 717 | |
|
| 718 | |
return NGX_CONF_OK;
|
| 719 | |
}
|
| 720 | |
|
| 721 | |
|
| 722 | |
static char *
|
| 723 | |
ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf, void *post, void *data)
|
| 724 | |
{
|
| 725 | |
if (ngx_linux_rtsig_max) {
|
| 726 | |
return ngx_conf_check_num_bounds(cf, post, data);
|
| 727 | |
}
|
| 728 | |
|
| 729 | |
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
|
| 730 | |
"\"rtsig_overflow_threshold\" is not supported "
|
| 731 | |
"since Linux 2.6.6-mm2, ignored");
|
| 732 | |
|
| 733 | |
return NGX_CONF_OK;
|
| 734 | |
}
|