#include <sys/timerfd.h>
#include <sys/wait.h>
-#include "sd-id128.h"
#include "sd-daemon.h"
-#include "macro.h"
-#include "prioq.h"
+#include "sd-event.h"
+#include "sd-id128.h"
+
+#include "alloc-util.h"
+#include "fd-util.h"
#include "hashmap.h"
-#include "util.h"
-#include "time-util.h"
+#include "list.h"
+#include "macro.h"
#include "missing.h"
+#include "prioq.h"
+#include "process-util.h"
#include "set.h"
-#include "list.h"
#include "signal-util.h"
-
-#include "sd-event.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "time-util.h"
+#include "util.h"
#define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC)
_SOURCE_EVENT_SOURCE_TYPE_INVALID = -1
} EventSourceType;
+static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = {
+ [SOURCE_IO] = "io",
+ [SOURCE_TIME_REALTIME] = "realtime",
+ [SOURCE_TIME_BOOTTIME] = "bootime",
+ [SOURCE_TIME_MONOTONIC] = "monotonic",
+ [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm",
+ [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm",
+ [SOURCE_SIGNAL] = "signal",
+ [SOURCE_CHILD] = "child",
+ [SOURCE_DEFER] = "defer",
+ [SOURCE_POST] = "post",
+ [SOURCE_EXIT] = "exit",
+ [SOURCE_WATCHDOG] = "watchdog",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int);
+
+/* All objects we use in epoll events start with this value, so that
+ * we know how to dispatch it */
+typedef enum WakeupType {
+ WAKEUP_NONE,
+ WAKEUP_EVENT_SOURCE,
+ WAKEUP_CLOCK_DATA,
+ WAKEUP_SIGNAL_DATA,
+ _WAKEUP_TYPE_MAX,
+ _WAKEUP_TYPE_INVALID = -1,
+} WakeupType;
+
#define EVENT_SOURCE_IS_TIME(t) IN_SET((t), SOURCE_TIME_REALTIME, SOURCE_TIME_BOOTTIME, SOURCE_TIME_MONOTONIC, SOURCE_TIME_REALTIME_ALARM, SOURCE_TIME_BOOTTIME_ALARM)
struct sd_event_source {
+ WakeupType wakeup;
+
unsigned n_ref;
sd_event *event;
};
struct clock_data {
+ WakeupType wakeup;
int fd;
/* For all clocks we maintain two priority queues each, one
bool needs_rearm:1;
};
+struct signal_data {
+ WakeupType wakeup;
+
+ /* For each priority we maintain one signal fd, so that we
+ * only have to dequeue a single event per priority at a
+ * time. */
+
+ int fd;
+ int64_t priority;
+ sigset_t sigset;
+ sd_event_source *current;
+};
+
struct sd_event {
unsigned n_ref;
int epoll_fd;
- int signal_fd;
int watchdog_fd;
Prioq *pending;
usec_t perturb;
- sigset_t sigset;
- sd_event_source **signal_sources;
+ sd_event_source **signal_sources; /* indexed by signal number */
+ Hashmap *signal_data; /* indexed by priority */
Hashmap *child_sources;
unsigned n_enabled_child_sources;
bool exit_requested:1;
bool need_process_child:1;
bool watchdog:1;
+ bool profile_delays:1;
int exit_code;
unsigned n_sources;
LIST_HEAD(sd_event_source, sources);
+
+ usec_t last_run, last_log;
+ unsigned delays[sizeof(usec_t) * 8];
};
static void source_disconnect(sd_event_source *s);
if (x->pending_iteration > y->pending_iteration)
return 1;
- /* Stability for the rest */
- if (x < y)
- return -1;
- if (x > y)
- return 1;
-
return 0;
}
assert(x->prepare);
assert(y->prepare);
+ /* Enabled ones first */
+ if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF)
+ return -1;
+ if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF)
+ return 1;
+
/* Move most recently prepared ones last, so that we can stop
* preparing as soon as we hit one that has already been
* prepared in the current iteration */
if (x->prepare_iteration > y->prepare_iteration)
return 1;
- /* Enabled ones first */
- if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF)
- return -1;
- if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF)
- return 1;
-
/* Lower priority values first */
if (x->priority < y->priority)
return -1;
if (x->priority > y->priority)
return 1;
- /* Stability for the rest */
- if (x < y)
- return -1;
- if (x > y)
- return 1;
-
return 0;
}
if (x->time.next > y->time.next)
return 1;
- /* Stability for the rest */
- if (x < y)
- return -1;
- if (x > y)
- return 1;
-
return 0;
}
if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy)
return 1;
- /* Stability for the rest */
- if (x < y)
- return -1;
- if (x > y)
- return 1;
-
return 0;
}
if (x->priority > y->priority)
return 1;
- /* Stability for the rest */
- if (x < y)
- return -1;
- if (x > y)
- return 1;
-
return 0;
}
static void free_clock_data(struct clock_data *d) {
assert(d);
+ assert(d->wakeup == WAKEUP_CLOCK_DATA);
safe_close(d->fd);
prioq_free(d->earliest);
*(e->default_event_ptr) = NULL;
safe_close(e->epoll_fd);
- safe_close(e->signal_fd);
safe_close(e->watchdog_fd);
free_clock_data(&e->realtime);
prioq_free(e->exit);
free(e->signal_sources);
+ hashmap_free(e->signal_data);
hashmap_free(e->child_sources);
set_free(e->post_sources);
return -ENOMEM;
e->n_ref = 1;
- e->signal_fd = e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->boottime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1;
+ e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->boottime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1;
e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY;
+ e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA;
e->original_pid = getpid();
e->perturb = USEC_INFINITY;
- assert_se(sigemptyset(&e->sigset) == 0);
-
- e->pending = prioq_new(pending_prioq_compare);
- if (!e->pending) {
- r = -ENOMEM;
+ r = prioq_ensure_allocated(&e->pending, pending_prioq_compare);
+ if (r < 0)
goto fail;
- }
e->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
if (e->epoll_fd < 0) {
goto fail;
}
+ if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) {
+ log_debug("Event loop profiling enabled. Logarithmic histogram of event loop iterations in the range 2^0 ... 2^63 us will be logged every 5s.");
+ e->profile_delays = true;
+ }
+
*ret = e;
return 0;
r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL);
if (r < 0)
- log_debug_errno(errno, "Failed to remove source %s from epoll: %m", strna(s->description));
+ log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m",
+ strna(s->description), event_source_type_to_string(s->type));
s->io.registered = false;
}
r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev);
else
r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev);
-
if (r < 0)
return -errno;
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
static clockid_t event_source_type_to_clock(EventSourceType t) {
switch (t) {
}
}
-static bool need_signal(sd_event *e, int signal) {
- return (e->signal_sources && e->signal_sources[signal] &&
- e->signal_sources[signal]->enabled != SD_EVENT_OFF)
- ||
- (signal == SIGCHLD &&
- e->n_enabled_child_sources > 0);
-}
+static int event_make_signal_data(
+ sd_event *e,
+ int sig,
+ struct signal_data **ret) {
-static int event_update_signal_fd(sd_event *e) {
struct epoll_event ev = {};
- bool add_to_epoll;
+ struct signal_data *d;
+ bool added = false;
+ sigset_t ss_copy;
+ int64_t priority;
int r;
assert(e);
if (event_pid_changed(e))
+ return -ECHILD;
+
+ if (e->signal_sources && e->signal_sources[sig])
+ priority = e->signal_sources[sig]->priority;
+ else
+ priority = 0;
+
+ d = hashmap_get(e->signal_data, &priority);
+ if (d) {
+ if (sigismember(&d->sigset, sig) > 0) {
+ if (ret)
+ *ret = d;
return 0;
+ }
+ } else {
+ r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops);
+ if (r < 0)
+ return r;
- add_to_epoll = e->signal_fd < 0;
+ d = new0(struct signal_data, 1);
+ if (!d)
+ return -ENOMEM;
+
+ d->wakeup = WAKEUP_SIGNAL_DATA;
+ d->fd = -1;
+ d->priority = priority;
- r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC);
+ r = hashmap_put(e->signal_data, &d->priority, d);
if (r < 0)
- return -errno;
+ return r;
- e->signal_fd = r;
+ added = true;
+ }
+
+ ss_copy = d->sigset;
+ assert_se(sigaddset(&ss_copy, sig) >= 0);
- if (!add_to_epoll)
+ r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ d->sigset = ss_copy;
+
+ if (d->fd >= 0) {
+ if (ret)
+ *ret = d;
return 0;
+ }
+
+ d->fd = r;
ev.events = EPOLLIN;
- ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL);
+ ev.data.ptr = d;
- r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev);
+ r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev);
if (r < 0) {
- e->signal_fd = safe_close(e->signal_fd);
- return -errno;
+ r = -errno;
+ goto fail;
}
+ if (ret)
+ *ret = d;
+
return 0;
+
+fail:
+ if (added) {
+ d->fd = safe_close(d->fd);
+ hashmap_remove(e->signal_data, &d->priority);
+ free(d);
+ }
+
+ return r;
+}
+
+static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) {
+ assert(e);
+ assert(d);
+
+ /* Turns off the specified signal in the signal data
+ * object. If the signal mask of the object becomes empty that
+ * way removes it. */
+
+ if (sigismember(&d->sigset, sig) == 0)
+ return;
+
+ assert_se(sigdelset(&d->sigset, sig) >= 0);
+
+ if (sigisemptyset(&d->sigset)) {
+
+ /* If all the mask is all-zero we can get rid of the structure */
+ hashmap_remove(e->signal_data, &d->priority);
+ assert(!d->current);
+ safe_close(d->fd);
+ free(d);
+ return;
+ }
+
+ assert(d->fd >= 0);
+
+ if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0)
+ log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m");
+}
+
+static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) {
+ struct signal_data *d;
+ static const int64_t zero_priority = 0;
+
+ assert(e);
+
+ /* Rechecks if the specified signal is still something we are
+ * interested in. If not, we'll unmask it, and possibly drop
+ * the signalfd for it. */
+
+ if (sig == SIGCHLD &&
+ e->n_enabled_child_sources > 0)
+ return;
+
+ if (e->signal_sources &&
+ e->signal_sources[sig] &&
+ e->signal_sources[sig]->enabled != SD_EVENT_OFF)
+ return;
+
+ /*
+ * The specified signal might be enabled in three different queues:
+ *
+ * 1) the one that belongs to the priority passed (if it is non-NULL)
+ * 2) the one that belongs to the priority of the event source of the signal (if there is one)
+ * 3) the 0 priority (to cover the SIGCHLD case)
+ *
+ * Hence, let's remove it from all three here.
+ */
+
+ if (priority) {
+ d = hashmap_get(e->signal_data, priority);
+ if (d)
+ event_unmask_signal_data(e, d, sig);
+ }
+
+ if (e->signal_sources && e->signal_sources[sig]) {
+ d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority);
+ if (d)
+ event_unmask_signal_data(e, d, sig);
+ }
+
+ d = hashmap_get(e->signal_data, &zero_priority);
+ if (d)
+ event_unmask_signal_data(e, d, sig);
}
static void source_disconnect(sd_event_source *s) {
case SOURCE_SIGNAL:
if (s->signal.sig > 0) {
+
if (s->event->signal_sources)
s->event->signal_sources[s->signal.sig] = NULL;
- /* If the signal was on and now it is off... */
- if (s->enabled != SD_EVENT_OFF && !need_signal(s->event, s->signal.sig)) {
- assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0);
-
- (void) event_update_signal_fd(s->event);
- /* If disabling failed, we might get a spurious event,
- * but otherwise nothing bad should happen. */
- }
+ event_gc_signal_data(s->event, &s->priority, s->signal.sig);
}
break;
if (s->enabled != SD_EVENT_OFF) {
assert(s->event->n_enabled_child_sources > 0);
s->event->n_enabled_child_sources--;
-
- /* We know the signal was on, if it is off now... */
- if (!need_signal(s->event, SIGCHLD)) {
- assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0);
-
- (void) event_update_signal_fd(s->event);
- /* If disabling failed, we might get a spurious event,
- * but otherwise nothing bad should happen. */
- }
}
- hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid));
+ (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid));
+ event_gc_signal_data(s->event, &s->priority, SIGCHLD);
}
break;
d->needs_rearm = true;
}
+ if (s->type == SOURCE_SIGNAL && !b) {
+ struct signal_data *d;
+
+ d = hashmap_get(s->event->signal_data, &s->priority);
+ if (d && d->current == s)
+ d->current = NULL;
+ }
+
return 0;
}
if (!s)
return -ENOMEM;
+ s->wakeup = WAKEUP_EVENT_SOURCE;
s->io.fd = fd;
s->io.events = events;
s->io.callback = callback;
return -errno;
ev.events = EPOLLIN;
- ev.data.ptr = INT_TO_PTR(clock_to_event_source_type(clock));
+ ev.data.ptr = d;
r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev);
if (r < 0) {
d = event_get_clock_data(e, type);
assert(d);
- if (!d->earliest) {
- d->earliest = prioq_new(earliest_time_prioq_compare);
- if (!d->earliest)
- return -ENOMEM;
- }
+ r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare);
+ if (r < 0)
+ return r;
- if (!d->latest) {
- d->latest = prioq_new(latest_time_prioq_compare);
- if (!d->latest)
- return -ENOMEM;
- }
+ r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare);
+ if (r < 0)
+ return r;
if (d->fd < 0) {
r = event_setup_timer_fd(e, d, clock);
void *userdata) {
sd_event_source *s;
+ struct signal_data *d;
sigset_t ss;
int r;
- bool previous;
assert_return(e, -EINVAL);
assert_return(sig > 0, -EINVAL);
callback = signal_exit_callback;
r = pthread_sigmask(SIG_SETMASK, NULL, &ss);
- if (r < 0)
- return -errno;
+ if (r != 0)
+ return -r;
if (!sigismember(&ss, sig))
return -EBUSY;
} else if (e->signal_sources[sig])
return -EBUSY;
- previous = need_signal(e, sig);
-
s = source_new(e, !ret, SOURCE_SIGNAL);
if (!s)
return -ENOMEM;
e->signal_sources[sig] = s;
- if (!previous) {
- assert_se(sigaddset(&e->sigset, sig) == 0);
-
- r = event_update_signal_fd(e);
+ r = event_make_signal_data(e, sig, &d);
if (r < 0) {
source_free(s);
return r;
}
- }
/* Use the signal name as description for the event source by default */
(void) sd_event_source_set_description(s, signal_to_string(sig));
return 0;
}
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_add_child(
sd_event *e,
sd_event_source **ret,
sd_event_source *s;
int r;
- bool previous;
assert_return(e, -EINVAL);
assert_return(pid > 1, -EINVAL);
if (r < 0)
return r;
- if (hashmap_contains(e->child_sources, INT_TO_PTR(pid)))
+ if (hashmap_contains(e->child_sources, PID_TO_PTR(pid)))
return -EBUSY;
- previous = need_signal(e, SIGCHLD);
-
s = source_new(e, !ret, SOURCE_CHILD);
if (!s)
return -ENOMEM;
s->userdata = userdata;
s->enabled = SD_EVENT_ONESHOT;
- r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s);
+ r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s);
if (r < 0) {
source_free(s);
return r;
e->n_enabled_child_sources ++;
- if (!previous) {
- assert_se(sigaddset(&e->sigset, SIGCHLD) == 0);
-
- r = event_update_signal_fd(e);
+ r = event_make_signal_data(e, SIGCHLD, NULL);
if (r < 0) {
+ e->n_enabled_child_sources--;
source_free(s);
return r;
}
- }
e->need_process_child = true;
return 0;
}
+#endif // 0
_public_ int sd_event_add_post(
sd_event *e,
assert_return(e->state != SD_EVENT_FINISHED, -ESTALE);
assert_return(!event_pid_changed(e), -ECHILD);
- if (!e->exit) {
- e->exit = prioq_new(exit_prioq_compare);
- if (!e->exit)
- return -ENOMEM;
- }
+ r = prioq_ensure_allocated(&e->exit, exit_prioq_compare);
+ if (r < 0)
+ return r;
s = source_new(e, !ret, SOURCE_EXIT);
if (!s)
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ sd_event_source* sd_event_source_ref(sd_event_source *s) {
assert_return(s, NULL);
return free_and_strdup(&s->description, description);
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_source_get_description(sd_event_source *s, const char **description) {
assert_return(s, -EINVAL);
assert_return(description, -EINVAL);
return s->event;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_source_get_pending(sd_event_source *s) {
assert_return(s, -EINVAL);
assert_return(s->type != SOURCE_EXIT, -EDOM);
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) {
assert_return(s, -EINVAL);
assert_return(events, -EINVAL);
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) {
assert_return(s, -EINVAL);
assert_return(revents, -EINVAL);
#endif // 0
_public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) {
+ int r;
+
assert_return(s, -EINVAL);
assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE);
assert_return(!event_pid_changed(s->event), -ECHILD);
if (s->priority == priority)
return 0;
+ if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) {
+ struct signal_data *old, *d;
+
+ /* Move us from the signalfd belonging to the old
+ * priority to the signalfd of the new priority */
+
+ assert_se(old = hashmap_get(s->event->signal_data, &s->priority));
+
+ s->priority = priority;
+
+ r = event_make_signal_data(s->event, s->signal.sig, &d);
+ if (r < 0) {
+ s->priority = old->priority;
+ return r;
+ }
+
+ event_unmask_signal_data(s->event, old, s->signal.sig);
+ } else
s->priority = priority;
if (s->pending)
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) {
assert_return(s, -EINVAL);
assert_return(m, -EINVAL);
}
case SOURCE_SIGNAL:
- assert(need_signal(s->event, s->signal.sig));
-
s->enabled = m;
- if (!need_signal(s->event, s->signal.sig)) {
- assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0);
-
- (void) event_update_signal_fd(s->event);
- /* If disabling failed, we might get a spurious event,
- * but otherwise nothing bad should happen. */
- }
-
+ event_gc_signal_data(s->event, &s->priority, s->signal.sig);
break;
case SOURCE_CHILD:
- assert(need_signal(s->event, SIGCHLD));
-
s->enabled = m;
assert(s->event->n_enabled_child_sources > 0);
s->event->n_enabled_child_sources--;
- if (!need_signal(s->event, SIGCHLD)) {
- assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0);
-
- (void) event_update_signal_fd(s->event);
- }
-
+ event_gc_signal_data(s->event, &s->priority, SIGCHLD);
break;
case SOURCE_EXIT:
}
case SOURCE_SIGNAL:
- /* Check status before enabling. */
- if (!need_signal(s->event, s->signal.sig)) {
- assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0);
- r = event_update_signal_fd(s->event);
+ s->enabled = m;
+
+ r = event_make_signal_data(s->event, s->signal.sig, NULL);
if (r < 0) {
s->enabled = SD_EVENT_OFF;
+ event_gc_signal_data(s->event, &s->priority, s->signal.sig);
return r;
}
- }
- s->enabled = m;
break;
case SOURCE_CHILD:
- /* Check status before enabling. */
- if (s->enabled == SD_EVENT_OFF) {
- if (!need_signal(s->event, SIGCHLD)) {
- assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0);
- r = event_update_signal_fd(s->event);
+ if (s->enabled == SD_EVENT_OFF)
+ s->event->n_enabled_child_sources++;
+
+ s->enabled = m;
+
+ r = event_make_signal_data(s->event, SIGCHLD, NULL);
if (r < 0) {
s->enabled = SD_EVENT_OFF;
+ s->event->n_enabled_child_sources--;
+ event_gc_signal_data(s->event, &s->priority, SIGCHLD);
return r;
}
- }
-
- s->event->n_enabled_child_sources++;
- }
- s->enabled = m;
break;
case SOURCE_EXIT:
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) {
assert_return(s, -EINVAL);
assert_return(usec, -EINVAL);
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ void* sd_event_source_get_userdata(sd_event_source *s) {
assert_return(s, NULL);
return 0;
}
-static int process_signal(sd_event *e, uint32_t events) {
+static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) {
bool read_one = false;
int r;
assert(e);
-
assert_return(events == EPOLLIN, -EIO);
+ /* If there's a signal queued on this priority and SIGCHLD is
+ on this priority too, then make sure to recheck the
+ children we watch. This is because we only ever dequeue
+ the first signal per priority, and if we dequeue one, and
+ SIGCHLD might be enqueued later we wouldn't know, but we
+ might have higher priority children we care about hence we
+ need to check that explicitly. */
+
+ if (sigismember(&d->sigset, SIGCHLD))
+ e->need_process_child = true;
+
+ /* If there's already an event source pending for this
+ * priority we don't read another */
+ if (d->current)
+ return 0;
+
for (;;) {
struct signalfd_siginfo si;
ssize_t n;
sd_event_source *s = NULL;
- n = read(e->signal_fd, &si, sizeof(si));
+ n = read(d->fd, &si, sizeof(si));
if (n < 0) {
if (errno == EAGAIN || errno == EINTR)
return read_one;
read_one = true;
- if (si.ssi_signo == SIGCHLD) {
- r = process_child(e);
- if (r < 0)
- return r;
- if (r > 0)
- continue;
- }
-
if (e->signal_sources)
s = e->signal_sources[si.ssi_signo];
-
if (!s)
continue;
+ if (s->pending)
+ continue;
s->signal.siginfo = si;
+ d->current = s;
+
r = source_set_pending(s, true);
if (r < 0)
return r;
+
+ return 1;
}
}
s->dispatching = false;
- if (r < 0) {
- if (s->description)
- log_debug_errno(r, "Event source '%s' returned error, disabling: %m", s->description);
- else
- log_debug_errno(r, "Event source %p returned error, disabling: %m", s);
- }
+ if (r < 0)
+ log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m",
+ strna(s->description), event_source_type_to_string(s->type));
if (s->n_ref == 0)
source_free(s);
r = s->prepare(s, s->userdata);
s->dispatching = false;
- if (r < 0) {
- if (s->description)
- log_debug_errno(r, "Prepare callback of event source '%s' returned error, disabling: %m", s->description);
- else
- log_debug_errno(r, "Prepare callback of event source %p returned error, disabling: %m", s);
- }
+ if (r < 0)
+ log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m",
+ strna(s->description), event_source_type_to_string(s->type));
if (s->n_ref == 0)
source_free(s);
e->iteration++;
+ e->state = SD_EVENT_PREPARING;
r = event_prepare(e);
+ e->state = SD_EVENT_INITIAL;
if (r < 0)
return r;
for (i = 0; i < m; i++) {
- if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME))
- r = flush_timer(e, e->realtime.fd, ev_queue[i].events, &e->realtime.next);
- else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME))
- r = flush_timer(e, e->boottime.fd, ev_queue[i].events, &e->boottime.next);
- else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_MONOTONIC))
- r = flush_timer(e, e->monotonic.fd, ev_queue[i].events, &e->monotonic.next);
- else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME_ALARM))
- r = flush_timer(e, e->realtime_alarm.fd, ev_queue[i].events, &e->realtime_alarm.next);
- else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME_ALARM))
- r = flush_timer(e, e->boottime_alarm.fd, ev_queue[i].events, &e->boottime_alarm.next);
- else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL))
- r = process_signal(e, ev_queue[i].events);
- else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG))
+ if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG))
r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL);
- else
+ else {
+ WakeupType *t = ev_queue[i].data.ptr;
+
+ switch (*t) {
+
+ case WAKEUP_EVENT_SOURCE:
r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events);
+ break;
+ case WAKEUP_CLOCK_DATA: {
+ struct clock_data *d = ev_queue[i].data.ptr;
+ r = flush_timer(e, d->fd, ev_queue[i].events, &d->next);
+ break;
+ }
+
+ case WAKEUP_SIGNAL_DATA:
+ r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events);
+ break;
+
+ default:
+ assert_not_reached("Invalid wake-up pointer");
+ }
+ }
if (r < 0)
goto finish;
}
return 1;
}
+static void event_log_delays(sd_event *e) {
+ char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1];
+ unsigned i;
+ int o;
+
+ for (i = o = 0; i < ELEMENTSOF(e->delays); i++) {
+ o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]);
+ e->delays[i] = 0;
+ }
+ log_debug("Event loop iterations: %.*s", o, b);
+}
+
_public_ int sd_event_run(sd_event *e, uint64_t timeout) {
int r;
assert_return(e->state != SD_EVENT_FINISHED, -ESTALE);
assert_return(e->state == SD_EVENT_INITIAL, -EBUSY);
+ if (e->profile_delays && e->last_run) {
+ usec_t this_run;
+ unsigned l;
+
+ this_run = now(CLOCK_MONOTONIC);
+
+ l = u64log2(this_run - e->last_run);
+ assert(l < sizeof(e->delays));
+ e->delays[l]++;
+
+ if (this_run - e->last_log >= 5*USEC_PER_SEC) {
+ event_log_delays(e);
+ e->last_log = this_run;
+ }
+ }
+
r = sd_event_prepare(e);
if (r == 0)
/* There was nothing? Then wait... */
r = sd_event_wait(e, timeout);
+ if (e->profile_delays)
+ e->last_run = now(CLOCK_MONOTONIC);
+
if (r > 0) {
/* There's something now, then let's dispatch it */
r = sd_event_dispatch(e);
return r;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_loop(sd_event *e) {
int r;
return e->state;
}
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_get_exit_code(sd_event *e, int *code) {
assert_return(e, -EINVAL);
assert_return(code, -EINVAL);
*code = e->exit_code;
return 0;
}
+#endif // 0
_public_ int sd_event_exit(sd_event *e, int code) {
assert_return(e, -EINVAL);
return 0;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) {
assert_return(e, -EINVAL);
assert_return(usec, -EINVAL);
assert_return(!event_pid_changed(e), -ECHILD);
+ assert_return(IN_SET(clock,
+ CLOCK_REALTIME,
+ CLOCK_REALTIME_ALARM,
+ CLOCK_MONOTONIC,
+ CLOCK_BOOTTIME,
+ CLOCK_BOOTTIME_ALARM), -EOPNOTSUPP);
if (!dual_timestamp_is_set(&e->timestamp)) {
/* Implicitly fall back to now() if we never ran
*usec = e->timestamp.monotonic;
break;
- case CLOCK_BOOTTIME:
- case CLOCK_BOOTTIME_ALARM:
+ default:
*usec = e->timestamp_boottime;
break;
}
return 1;
}
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_get_tid(sd_event *e, pid_t *tid) {
assert_return(e, -EINVAL);
assert_return(tid, -EINVAL);
return -ENXIO;
}
+#endif // 0
_public_ int sd_event_set_watchdog(sd_event *e, int b) {
int r;
return r;
}
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
_public_ int sd_event_get_watchdog(sd_event *e) {
assert_return(e, -EINVAL);
assert_return(!event_pid_changed(e), -ECHILD);
~ianmdlvl / elogind.git / blobdiff