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Diffstat (limited to 'storage/mroonga/vendor/groonga/vendor/nginx-1.7.4/src/event/modules/ngx_rtsig_module.c')
-rw-r--r--storage/mroonga/vendor/groonga/vendor/nginx-1.7.4/src/event/modules/ngx_rtsig_module.c747
1 files changed, 747 insertions, 0 deletions
diff --git a/storage/mroonga/vendor/groonga/vendor/nginx-1.7.4/src/event/modules/ngx_rtsig_module.c b/storage/mroonga/vendor/groonga/vendor/nginx-1.7.4/src/event/modules/ngx_rtsig_module.c
new file mode 100644
index 00000000000..b36230c7650
--- /dev/null
+++ b/storage/mroonga/vendor/groonga/vendor/nginx-1.7.4/src/event/modules/ngx_rtsig_module.c
@@ -0,0 +1,747 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#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, /* create configuration */
+ ngx_rtsig_init_conf, /* init configuration */
+
+ {
+ NULL, /* add an event */
+ NULL, /* delete an event */
+ NULL, /* enable an event */
+ NULL, /* disable an event */
+ ngx_rtsig_add_connection, /* add an connection */
+ ngx_rtsig_del_connection, /* delete an connection */
+ NULL, /* process the changes */
+ ngx_rtsig_process_events, /* process the events */
+ ngx_rtsig_init, /* init the events */
+ ngx_rtsig_done, /* done the events */
+ }
+
+};
+
+ngx_module_t ngx_rtsig_module = {
+ NGX_MODULE_V1,
+ &ngx_rtsig_module_ctx, /* module context */
+ ngx_rtsig_commands, /* module directives */
+ NGX_EVENT_MODULE, /* module type */
+ NULL, /* init master */
+ NULL, /* init module */
+ NULL, /* init process */
+ NULL, /* init thread */
+ NULL, /* exit thread */
+ NULL, /* exit process */
+ NULL, /* exit master */
+ 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, **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);
+
+ /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
+
+ 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) {
+
+ /* timeout */
+
+ 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) {
+
+ /* the stale event */
+
+ return NGX_OK;
+ }
+
+ instance = signo - (int) rtscf->signo;
+
+ rev = c->read;
+
+ if (rev->instance != instance) {
+
+ /*
+ * the stale event from a file descriptor
+ * that was just closed in this iteration
+ */
+
+ 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 = (ngx_event_t **) (rev->accept ?
+ &ngx_posted_accept_events : &ngx_posted_events);
+
+ ngx_locked_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_locked_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");
+
+ /* flush the RT signal queue */
+
+ 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, **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;
+ }
+
+ ngx_mutex_lock(ngx_posted_events_mutex);
+
+ 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++;
+
+ if ((flags & NGX_POST_THREAD_EVENTS) && !rev->accept) {
+ rev->posted_ready = 1;
+
+ } else {
+ rev->ready = 1;
+ }
+
+ if (flags & NGX_POST_EVENTS) {
+ queue = (ngx_event_t **) (rev->accept ?
+ &ngx_posted_accept_events : &ngx_posted_events);
+
+ ngx_locked_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++;
+
+ if (flags & NGX_POST_THREAD_EVENTS) {
+ wev->posted_ready = 1;
+
+ } else {
+ wev->ready = 1;
+ }
+
+ if (flags & NGX_POST_EVENTS) {
+ ngx_locked_post_event(wev, &ngx_posted_events);
+
+ } else {
+ wev->handler(wev);
+ }
+ }
+ }
+
+ ngx_mutex_unlock(ngx_posted_events_mutex);
+
+ if (tested >= rtscf->overflow_test) {
+
+ if (ngx_linux_rtsig_max) {
+
+ /*
+ * Check the current rt queue length to prevent
+ * the new overflow.
+ *
+ * learn the "/proc/sys/kernel/rtsig-max" value because
+ * it can be changed since the last checking
+ */
+
+ 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[0] = CTL_KERN; */
+ 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;
+ }
+
+ /*
+ * drain the rt signal queue if the /"proc/sys/kernel/rtsig-nr"
+ * is bigger than
+ * "/proc/sys/kernel/rtsig-max" / "rtsig_overflow_threshold"
+ */
+
+ 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)
+ {
+ /* void */
+ }
+ }
+
+ } else {
+
+ /*
+ * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
+ * so drain the rt signal queue unconditionally
+ */
+
+ while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK) {
+ /* void */
+ }
+ }
+
+ 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;
+
+ /* LinuxThreads use the first 3 RT signals */
+ 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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