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src/event/modules/ngx_rtsig_module.c - nginx-1.7.10
Global variables defined
Data types defined
Functions defined
Macros defined
Source code
- #include <ngx_config.h>
- #include <ngx_core.h>
- #include <ngx_event.h>
- #if (NGX_TEST_BUILD_RTSIG)
- #if (NGX_DARWIN)
- #define SIGRTMIN 33
- #define si_fd __pad[0]
- #else
- #ifdef SIGRTMIN
- #define si_fd _reason.__spare__.__spare2__[0]
- #else
- #define SIGRTMIN 33
- #define si_fd __spare__[0]
- #endif
- #endif
- #define F_SETSIG 10
- #define KERN_RTSIGNR 30
- #define KERN_RTSIGMAX 31
- int sigtimedwait(const sigset_t *set, siginfo_t *info,
- const struct timespec *timeout);
- int sigtimedwait(const sigset_t *set, siginfo_t *info,
- const struct timespec *timeout)
- {
- return -1;
- }
- int ngx_linux_rtsig_max;
- #endif
- typedef struct {
- ngx_uint_t signo;
- ngx_uint_t overflow_events;
- ngx_uint_t overflow_test;
- ngx_uint_t overflow_threshold;
- } ngx_rtsig_conf_t;
- extern ngx_event_module_t ngx_poll_module_ctx;
- static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer);
- static void ngx_rtsig_done(ngx_cycle_t *cycle);
- static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
- static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c,
- ngx_uint_t flags);
- static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle,
- ngx_msec_t timer, ngx_uint_t flags);
- static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle,
- ngx_msec_t timer, ngx_uint_t flags);
- static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
- static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
- static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
- void *post, void *data);
- static sigset_t set;
- static ngx_uint_t overflow, overflow_current;
- static struct pollfd *overflow_list;
- static ngx_str_t rtsig_name = ngx_string("rtsig");
- static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
- ngx_check_ngx_overflow_threshold_bounds, 2, 10
- };
- static ngx_command_t ngx_rtsig_commands[] = {
- { ngx_string("rtsig_signo"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, signo),
- NULL },
- { ngx_string("rtsig_overflow_events"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, overflow_events),
- NULL },
- { ngx_string("rtsig_overflow_test"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, overflow_test),
- NULL },
- { ngx_string("rtsig_overflow_threshold"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, overflow_threshold),
- &ngx_overflow_threshold_bounds },
- ngx_null_command
- };
- ngx_event_module_t ngx_rtsig_module_ctx = {
- &rtsig_name,
- ngx_rtsig_create_conf,
- ngx_rtsig_init_conf,
- {
- NULL,
- NULL,
- NULL,
- NULL,
- ngx_rtsig_add_connection,
- ngx_rtsig_del_connection,
- NULL,
- ngx_rtsig_process_events,
- ngx_rtsig_init,
- ngx_rtsig_done,
- }
- };
- ngx_module_t ngx_rtsig_module = {
- NGX_MODULE_V1,
- &ngx_rtsig_module_ctx,
- ngx_rtsig_commands,
- NGX_EVENT_MODULE,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NGX_MODULE_V1_PADDING
- };
- static ngx_int_t
- ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer)
- {
- ngx_rtsig_conf_t *rtscf;
- rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
- sigemptyset(&set);
- sigaddset(&set, (int) rtscf->signo);
- sigaddset(&set, (int) rtscf->signo + 1);
- sigaddset(&set, SIGIO);
- sigaddset(&set, SIGALRM);
- if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
- ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
- "sigprocmask() failed");
- return NGX_ERROR;
- }
- if (overflow_list) {
- ngx_free(overflow_list);
- }
- overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
- cycle->log);
- if (overflow_list == NULL) {
- return NGX_ERROR;
- }
- ngx_io = ngx_os_io;
- ngx_event_actions = ngx_rtsig_module_ctx.actions;
- ngx_event_flags = NGX_USE_RTSIG_EVENT
- |NGX_USE_GREEDY_EVENT
- |NGX_USE_FD_EVENT;
- return NGX_OK;
- }
- static void
- ngx_rtsig_done(ngx_cycle_t *cycle)
- {
- ngx_free(overflow_list);
- overflow_list = NULL;
- }
- static ngx_int_t
- ngx_rtsig_add_connection(ngx_connection_t *c)
- {
- ngx_uint_t signo;
- ngx_rtsig_conf_t *rtscf;
- if (c->read->accept && c->read->disabled) {
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig enable connection: fd:%d", c->fd);
- if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETOWN) failed");
- return NGX_ERROR;
- }
- c->read->active = 1;
- c->read->disabled = 0;
- }
- rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
- signo = rtscf->signo + c->read->instance;
- ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig add connection: fd:%d signo:%ui", c->fd, signo);
- if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
- return NGX_ERROR;
- }
- if (fcntl(c->fd, F_SETSIG, (int) signo) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETSIG) failed");
- return NGX_ERROR;
- }
- if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETOWN) failed");
- return NGX_ERROR;
- }
- #if (NGX_HAVE_ONESIGFD)
- if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETAUXFL) failed");
- return NGX_ERROR;
- }
- #endif
- c->read->active = 1;
- c->write->active = 1;
- return NGX_OK;
- }
- static ngx_int_t
- ngx_rtsig_del_connection(ngx_connection_t *c, ngx_uint_t flags)
- {
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig del connection: fd:%d", c->fd);
- if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig disable connection: fd:%d", c->fd);
- c->read->active = 0;
- c->read->disabled = 1;
- return NGX_OK;
- }
- if (flags & NGX_CLOSE_EVENT) {
- c->read->active = 0;
- c->write->active = 0;
- return NGX_OK;
- }
- if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(O_RDWR|O_NONBLOCK) failed");
- return NGX_ERROR;
- }
- c->read->active = 0;
- c->write->active = 0;
- return NGX_OK;
- }
- static ngx_int_t
- ngx_rtsig_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
- {
- int signo;
- ngx_int_t instance;
- ngx_err_t err;
- siginfo_t si;
- ngx_event_t *rev, *wev;
- ngx_queue_t *queue;
- struct timespec ts, *tp;
- struct sigaction sa;
- ngx_connection_t *c;
- ngx_rtsig_conf_t *rtscf;
- if (timer == NGX_TIMER_INFINITE) {
- tp = NULL;
- } else {
- ts.tv_sec = timer / 1000;
- ts.tv_nsec = (timer % 1000) * 1000000;
- tp = &ts;
- }
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig timer: %M", timer);
-
- signo = sigtimedwait(&set, &si, tp);
- if (signo == -1) {
- err = ngx_errno;
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
- "rtsig signo:%d", signo);
- if (flags & NGX_UPDATE_TIME) {
- ngx_time_update();
- }
- if (err == NGX_EAGAIN) {
-
- if (timer != NGX_TIMER_INFINITE) {
- return NGX_AGAIN;
- }
- ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
- "sigtimedwait() returned EAGAIN without timeout");
- return NGX_ERROR;
- }
- ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
- cycle->log, err, "sigtimedwait() failed");
- return NGX_ERROR;
- }
- ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig signo:%d fd:%d band:%04Xd",
- signo, si.si_fd, si.si_band);
- if (flags & NGX_UPDATE_TIME) {
- ngx_time_update();
- }
- rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
- if (signo == (int) rtscf->signo || signo == (int) rtscf->signo + 1) {
- if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
- return NGX_OK;
- }
- c = ngx_cycle->files[si.si_fd];
- if (c == NULL) {
-
- return NGX_OK;
- }
- instance = signo - (int) rtscf->signo;
- rev = c->read;
- if (rev->instance != instance) {
-
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig: stale event %p", c);
- return NGX_OK;
- }
- if ((si.si_band & (POLLIN|POLLHUP|POLLERR)) && rev->active) {
- rev->ready = 1;
- if (flags & NGX_POST_EVENTS) {
- queue = rev->accept ? &ngx_posted_accept_events
- : &ngx_posted_events;
- ngx_post_event(rev, queue);
- } else {
- rev->handler(rev);
- }
- }
- wev = c->write;
- if ((si.si_band & (POLLOUT|POLLHUP|POLLERR)) && wev->active) {
- wev->ready = 1;
- if (flags & NGX_POST_EVENTS) {
- ngx_post_event(wev, &ngx_posted_events);
- } else {
- wev->handler(wev);
- }
- }
- return NGX_OK;
- } else if (signo == SIGALRM) {
- ngx_time_update();
- return NGX_OK;
- } else if (signo == SIGIO) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
- "rt signal queue overflowed");
-
- ngx_memzero(&sa, sizeof(struct sigaction));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(rtscf->signo, &sa, NULL) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
- "sigaction(%d, SIG_DFL) failed", rtscf->signo);
- }
- if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
- "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
- }
- overflow = 1;
- overflow_current = 0;
- ngx_event_actions.process_events = ngx_rtsig_process_overflow;
- return NGX_ERROR;
- }
- ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
- "sigtimedwait() returned unexpected signal: %d", signo);
- return NGX_ERROR;
- }
- static ngx_int_t
- ngx_rtsig_process_overflow(ngx_cycle_t *cycle, ngx_msec_t timer,
- ngx_uint_t flags)
- {
- int name[2], rtsig_max, rtsig_nr, events, ready;
- size_t len;
- ngx_err_t err;
- ngx_uint_t tested, n, i;
- ngx_event_t *rev, *wev;
- ngx_queue_t *queue;
- ngx_connection_t *c;
- ngx_rtsig_conf_t *rtscf;
- ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig process overflow");
- rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
- tested = 0;
- for ( ;; ) {
- n = 0;
- while (n < rtscf->overflow_events) {
- if (overflow_current == cycle->connection_n) {
- break;
- }
- c = cycle->files[overflow_current++];
- if (c == NULL || c->fd == -1) {
- continue;
- }
- events = 0;
- if (c->read->active && c->read->handler) {
- events |= POLLIN;
- }
- if (c->write->active && c->write->handler) {
- events |= POLLOUT;
- }
- if (events == 0) {
- continue;
- }
- overflow_list[n].fd = c->fd;
- overflow_list[n].events = events;
- overflow_list[n].revents = 0;
- n++;
- }
- if (n == 0) {
- break;
- }
- for ( ;; ) {
- ready = poll(overflow_list, n, 0);
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig overflow poll:%d", ready);
- if (ready == -1) {
- err = ngx_errno;
- ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
- cycle->log, 0,
- "poll() failed while the overflow recover");
- if (err == NGX_EINTR) {
- continue;
- }
- }
- break;
- }
- if (ready <= 0) {
- continue;
- }
- for (i = 0; i < n; i++) {
- c = cycle->files[overflow_list[i].fd];
- if (c == NULL) {
- continue;
- }
- rev = c->read;
- if (rev->active
- && !rev->closed
- && rev->handler
- && (overflow_list[i].revents
- & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
- {
- tested++;
- rev->ready = 1;
- if (flags & NGX_POST_EVENTS) {
- queue = rev->accept ? &ngx_posted_accept_events
- : &ngx_posted_events;
- ngx_post_event(rev, queue);
- } else {
- rev->handler(rev);
- }
- }
- wev = c->write;
- if (wev->active
- && !wev->closed
- && wev->handler
- && (overflow_list[i].revents
- & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
- {
- tested++;
- wev->ready = 1;
- if (flags & NGX_POST_EVENTS) {
- ngx_post_event(wev, &ngx_posted_events);
- } else {
- wev->handler(wev);
- }
- }
- }
- if (tested >= rtscf->overflow_test) {
- if (ngx_linux_rtsig_max) {
-
- name[0] = CTL_KERN;
- name[1] = KERN_RTSIGMAX;
- len = sizeof(rtsig_max);
- if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
- "sysctl(KERN_RTSIGMAX) failed");
- return NGX_ERROR;
- }
-
- name[1] = KERN_RTSIGNR;
- len = sizeof(rtsig_nr);
- if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
- "sysctl(KERN_RTSIGNR) failed");
- return NGX_ERROR;
- }
-
- if (rtsig_max / (int) rtscf->overflow_threshold < rtsig_nr) {
- ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig queue state: %d/%d",
- rtsig_nr, rtsig_max);
- while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK)
- {
-
- }
- }
- } else {
-
- while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK) {
-
- }
- }
- tested = 0;
- }
- }
- if (flags & NGX_UPDATE_TIME) {
- ngx_time_update();
- }
- ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
- "rt signal queue overflow recovered");
- overflow = 0;
- ngx_event_actions.process_events = ngx_rtsig_process_events;
- return NGX_OK;
- }
- static void *
- ngx_rtsig_create_conf(ngx_cycle_t *cycle)
- {
- ngx_rtsig_conf_t *rtscf;
- rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
- if (rtscf == NULL) {
- return NULL;
- }
- rtscf->signo = NGX_CONF_UNSET;
- rtscf->overflow_events = NGX_CONF_UNSET;
- rtscf->overflow_test = NGX_CONF_UNSET;
- rtscf->overflow_threshold = NGX_CONF_UNSET;
- return rtscf;
- }
- static char *
- ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
- {
- ngx_rtsig_conf_t *rtscf = conf;
-
- ngx_conf_init_uint_value(rtscf->signo, SIGRTMIN + 10);
- ngx_conf_init_uint_value(rtscf->overflow_events, 16);
- ngx_conf_init_uint_value(rtscf->overflow_test, 32);
- ngx_conf_init_uint_value(rtscf->overflow_threshold, 10);
- return NGX_CONF_OK;
- }
- static char *
- ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf, void *post, void *data)
- {
- if (ngx_linux_rtsig_max) {
- return ngx_conf_check_num_bounds(cf, post, data);
- }
- ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
- "\"rtsig_overflow_threshold\" is not supported "
- "since Linux 2.6.6-mm2, ignored");
- return NGX_CONF_OK;
- }
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