blob: af916759317b17a1f9a5709e3bb65aec897793f1 [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_kqueue_module.h>
typedef struct {
int changes;
int events;
} ngx_kqueue_conf_t;
static ngx_int_t ngx_kqueue_init(ngx_cycle_t *cycle, ngx_msec_t timer);
static void ngx_kqueue_done(ngx_cycle_t *cycle);
static ngx_int_t ngx_kqueue_add_event(ngx_event_t *ev, int event, u_int flags);
static ngx_int_t ngx_kqueue_del_event(ngx_event_t *ev, int event, u_int flags);
static ngx_int_t ngx_kqueue_set_event(ngx_event_t *ev, int filter, u_int flags);
static ngx_int_t ngx_kqueue_process_changes(ngx_cycle_t *cycle, ngx_uint_t try);
static ngx_int_t ngx_kqueue_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
ngx_uint_t flags);
static ngx_inline void ngx_kqueue_dump_event(ngx_log_t *log,
struct kevent *kev);
static void *ngx_kqueue_create_conf(ngx_cycle_t *cycle);
static char *ngx_kqueue_init_conf(ngx_cycle_t *cycle, void *conf);
int ngx_kqueue = -1;
/*
* The "change_list" should be declared as ngx_thread_volatile.
* However, the use of the change_list is localized in kqueue functions and
* is protected by the mutex so even the "icc -ipo" should not build the code
* with the race condition. Thus we avoid the declaration to make a more
* readable code.
*/
static struct kevent *change_list, *change_list0, *change_list1;
static struct kevent *event_list;
static int max_changes, nchanges, nevents;
#if (NGX_THREADS)
static ngx_mutex_t *list_mutex;
static ngx_mutex_t *kevent_mutex;
#endif
static ngx_str_t kqueue_name = ngx_string("kqueue");
static ngx_command_t ngx_kqueue_commands[] = {
{ ngx_string("kqueue_changes"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
0,
offsetof(ngx_kqueue_conf_t, changes),
NULL },
{ ngx_string("kqueue_events"),
NGX_EVENT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
0,
offsetof(ngx_kqueue_conf_t, events),
NULL },
ngx_null_command
};
ngx_event_module_t ngx_kqueue_module_ctx = {
&kqueue_name,
ngx_kqueue_create_conf, /* create configuration */
ngx_kqueue_init_conf, /* init configuration */
{
ngx_kqueue_add_event, /* add an event */
ngx_kqueue_del_event, /* delete an event */
ngx_kqueue_add_event, /* enable an event */
ngx_kqueue_del_event, /* disable an event */
NULL, /* add an connection */
NULL, /* delete an connection */
ngx_kqueue_process_changes, /* process the changes */
ngx_kqueue_process_events, /* process the events */
ngx_kqueue_init, /* init the events */
ngx_kqueue_done /* done the events */
}
};
ngx_module_t ngx_kqueue_module = {
NGX_MODULE_V1,
&ngx_kqueue_module_ctx, /* module context */
ngx_kqueue_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_kqueue_init(ngx_cycle_t *cycle, ngx_msec_t timer)
{
ngx_kqueue_conf_t *kcf;
struct timespec ts;
#if (NGX_HAVE_TIMER_EVENT)
struct kevent kev;
#endif
kcf = ngx_event_get_conf(cycle->conf_ctx, ngx_kqueue_module);
if (ngx_kqueue == -1) {
ngx_kqueue = kqueue();
if (ngx_kqueue == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
"kqueue() failed");
return NGX_ERROR;
}
#if (NGX_THREADS)
list_mutex = ngx_mutex_init(cycle->log, 0);
if (list_mutex == NULL) {
return NGX_ERROR;
}
kevent_mutex = ngx_mutex_init(cycle->log, 0);
if (kevent_mutex == NULL) {
return NGX_ERROR;
}
#endif
}
if (max_changes < kcf->changes) {
if (nchanges) {
ts.tv_sec = 0;
ts.tv_nsec = 0;
if (kevent(ngx_kqueue, change_list, nchanges, NULL, 0, &ts) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"kevent() failed");
return NGX_ERROR;
}
nchanges = 0;
}
if (change_list0) {
ngx_free(change_list0);
}
change_list0 = ngx_alloc(kcf->changes * sizeof(struct kevent),
cycle->log);
if (change_list0 == NULL) {
return NGX_ERROR;
}
if (change_list1) {
ngx_free(change_list1);
}
change_list1 = ngx_alloc(kcf->changes * sizeof(struct kevent),
cycle->log);
if (change_list1 == NULL) {
return NGX_ERROR;
}
change_list = change_list0;
}
max_changes = kcf->changes;
if (nevents < kcf->events) {
if (event_list) {
ngx_free(event_list);
}
event_list = ngx_alloc(kcf->events * sizeof(struct kevent), cycle->log);
if (event_list == NULL) {
return NGX_ERROR;
}
}
ngx_event_flags = 0;
#if (NGX_HAVE_TIMER_EVENT)
if (timer) {
kev.ident = 0;
kev.filter = EVFILT_TIMER;
kev.flags = EV_ADD|EV_ENABLE;
kev.fflags = 0;
kev.data = timer;
kev.udata = 0;
ts.tv_sec = 0;
ts.tv_nsec = 0;
if (kevent(ngx_kqueue, &kev, 1, NULL, 0, &ts) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"kevent(EVFILT_TIMER) failed");
return NGX_ERROR;
}
ngx_event_flags |= NGX_USE_TIMER_EVENT;
}
#endif
ngx_event_flags |= NGX_USE_ONESHOT_EVENT|NGX_USE_KQUEUE_EVENT;
#if (NGX_HAVE_CLEAR_EVENT)
ngx_event_flags |= NGX_USE_CLEAR_EVENT;
#else
ngx_event_flags |= NGX_USE_LEVEL_EVENT;
#endif
#if (NGX_HAVE_LOWAT_EVENT)
ngx_event_flags |= NGX_USE_LOWAT_EVENT;
#endif
nevents = kcf->events;
ngx_io = ngx_os_io;
ngx_event_actions = ngx_kqueue_module_ctx.actions;
return NGX_OK;
}
static void
ngx_kqueue_done(ngx_cycle_t *cycle)
{
if (close(ngx_kqueue) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"kqueue close() failed");
}
ngx_kqueue = -1;
#if (NGX_THREADS)
ngx_mutex_destroy(kevent_mutex);
ngx_mutex_destroy(list_mutex);
#endif
ngx_free(change_list1);
ngx_free(change_list0);
ngx_free(event_list);
change_list1 = NULL;
change_list0 = NULL;
change_list = NULL;
event_list = NULL;
max_changes = 0;
nchanges = 0;
nevents = 0;
}
static ngx_int_t
ngx_kqueue_add_event(ngx_event_t *ev, int event, u_int flags)
{
ngx_int_t rc;
#if 0
ngx_event_t *e;
ngx_connection_t *c;
#endif
ev->active = 1;
ev->disabled = 0;
ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
ngx_mutex_lock(list_mutex);
#if 0
if (ev->index < (u_int) nchanges
&& ((uintptr_t) change_list[ev->index].udata & (uintptr_t) ~1)
== (uintptr_t) ev)
{
if (change_list[ev->index].flags == EV_DISABLE) {
/*
* if the EV_DISABLE is still not passed to a kernel
* we will not pass it
*/
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"kevent activated: %d: ft:%d",
ngx_event_ident(ev->data), event);
if (ev->index < (u_int) --nchanges) {
e = (ngx_event_t *)
((uintptr_t) change_list[nchanges].udata & (uintptr_t) ~1);
change_list[ev->index] = change_list[nchanges];
e->index = ev->index;
}
ngx_mutex_unlock(list_mutex);
return NGX_OK;
}
c = ev->data;
ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
"previous event on #%d were not passed in kernel", c->fd);
ngx_mutex_unlock(list_mutex);
return NGX_ERROR;
}
#endif
rc = ngx_kqueue_set_event(ev, event, EV_ADD|EV_ENABLE|flags);
ngx_mutex_unlock(list_mutex);
return rc;
}
static ngx_int_t
ngx_kqueue_del_event(ngx_event_t *ev, int event, u_int flags)
{
ngx_int_t rc;
ngx_event_t *e;
ev->active = 0;
ev->disabled = 0;
ngx_mutex_lock(list_mutex);
if (ev->index < (u_int) nchanges
&& ((uintptr_t) change_list[ev->index].udata & (uintptr_t) ~1)
== (uintptr_t) ev)
{
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"kevent deleted: %d: ft:%d",
ngx_event_ident(ev->data), event);
/* if the event is still not passed to a kernel we will not pass it */
nchanges--;
if (ev->index < (u_int) nchanges) {
e = (ngx_event_t *)
((uintptr_t) change_list[nchanges].udata & (uintptr_t) ~1);
change_list[ev->index] = change_list[nchanges];
e->index = ev->index;
}
ngx_mutex_unlock(list_mutex);
return NGX_OK;
}
/*
* when the file descriptor is closed the kqueue automatically deletes
* its filters so we do not need to delete explicity the event
* before the closing the file descriptor.
*/
if (flags & NGX_CLOSE_EVENT) {
ngx_mutex_unlock(list_mutex);
return NGX_OK;
}
if (flags & NGX_DISABLE_EVENT) {
ev->disabled = 1;
}
rc = ngx_kqueue_set_event(ev, event,
flags & NGX_DISABLE_EVENT ? EV_DISABLE : EV_DELETE);
ngx_mutex_unlock(list_mutex);
return rc;
}
static ngx_int_t
ngx_kqueue_set_event(ngx_event_t *ev, int filter, u_int flags)
{
struct kevent *kev;
struct timespec ts;
ngx_connection_t *c;
c = ev->data;
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"kevent set event: %d: ft:%d fl:%04Xd",
c->fd, filter, flags);
if (nchanges >= max_changes) {
ngx_log_error(NGX_LOG_WARN, ev->log, 0,
"kqueue change list is filled up");
ts.tv_sec = 0;
ts.tv_nsec = 0;
if (kevent(ngx_kqueue, change_list, nchanges, NULL, 0, &ts) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "kevent() failed");
return NGX_ERROR;
}
nchanges = 0;
}
kev = &change_list[nchanges];
kev->ident = c->fd;
kev->filter = filter;
kev->flags = flags;
kev->udata = NGX_KQUEUE_UDATA_T ((uintptr_t) ev | ev->instance);
if (filter == EVFILT_VNODE) {
kev->fflags = NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND
|NOTE_ATTRIB|NOTE_RENAME
#if (__FreeBSD__ == 4 && __FreeBSD_version >= 430000) \
|| __FreeBSD_version >= 500018
|NOTE_REVOKE
#endif
;
kev->data = 0;
} else {
#if (NGX_HAVE_LOWAT_EVENT)
if (flags & NGX_LOWAT_EVENT) {
kev->fflags = NOTE_LOWAT;
kev->data = ev->available;
} else {
kev->fflags = 0;
kev->data = 0;
}
#else
kev->fflags = 0;
kev->data = 0;
#endif
}
ev->index = nchanges;
nchanges++;
return NGX_OK;
}
static ngx_int_t
ngx_kqueue_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
ngx_uint_t flags)
{
int events, n;
ngx_int_t i, instance;
ngx_uint_t level;
ngx_err_t err;
ngx_event_t *ev, **queue;
struct timespec ts, *tp;
if (ngx_threaded) {
if (ngx_kqueue_process_changes(cycle, 0) == NGX_ERROR) {
return NGX_ERROR;
}
n = 0;
} else {
n = nchanges;
nchanges = 0;
}
if (timer == NGX_TIMER_INFINITE) {
tp = NULL;
} else {
ts.tv_sec = timer / 1000;
ts.tv_nsec = (timer % 1000) * 1000000;
/*
* 64-bit Darwin kernel has the bug: kernel level ts.tv_nsec is
* the int32_t while user level ts.tv_nsec is the long (64-bit),
* so on the big endian PowerPC all nanoseconds are lost.
*/
#if (NGX_DARWIN_KEVENT_BUG)
ts.tv_nsec <<= 32;
#endif
tp = &ts;
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"kevent timer: %M, changes: %d", timer, n);
events = kevent(ngx_kqueue, change_list, n, event_list, nevents, tp);
if (events == -1) {
err = ngx_errno;
} else {
err = 0;
}
if (flags & NGX_UPDATE_TIME) {
ngx_time_update(0, 0);
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"kevent events: %d", events);
if (err) {
if (err == NGX_EINTR) {
if (ngx_event_timer_alarm) {
ngx_event_timer_alarm = 0;
return NGX_OK;
}
level = NGX_LOG_INFO;
} else {
level = NGX_LOG_ALERT;
}
ngx_log_error(level, cycle->log, err, "kevent() failed");
return NGX_ERROR;
}
if (events == 0) {
if (timer != NGX_TIMER_INFINITE) {
return NGX_OK;
}
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"kevent() returned no events without timeout");
return NGX_ERROR;
}
ngx_mutex_lock(ngx_posted_events_mutex);
for (i = 0; i < events; i++) {
ngx_kqueue_dump_event(cycle->log, &event_list[i]);
if (event_list[i].flags & EV_ERROR) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, event_list[i].data,
"kevent() error on %d filter:%d flags:%04Xd",
event_list[i].ident, event_list[i].filter,
event_list[i].flags);
continue;
}
#if (NGX_HAVE_TIMER_EVENT)
if (event_list[i].filter == EVFILT_TIMER) {
ngx_time_update(0, 0);
continue;
}
#endif
ev = (ngx_event_t *) event_list[i].udata;
switch (event_list[i].filter) {
case EVFILT_READ:
case EVFILT_WRITE:
instance = (uintptr_t) ev & 1;
ev = (ngx_event_t *) ((uintptr_t) ev & (uintptr_t) ~1);
if (ev->closed || ev->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,
"kevent: stale event %p", ev);
continue;
}
if (ev->log && (ev->log->log_level & NGX_LOG_DEBUG_CONNECTION)) {
ngx_kqueue_dump_event(ev->log, &event_list[i]);
}
if (ev->oneshot) {
ev->active = 0;
}
#if (NGX_THREADS)
if ((flags & NGX_POST_THREAD_EVENTS) && !ev->accept) {
ev->posted_ready = 1;
ev->posted_available = event_list[i].data;
if (event_list[i].flags & EV_EOF) {
ev->posted_eof = 1;
ev->posted_errno = event_list[i].fflags;
}
ngx_locked_post_event(ev, &ngx_posted_events);
continue;
}
#endif
ev->available = event_list[i].data;
if (event_list[i].flags & EV_EOF) {
ev->pending_eof = 1;
ev->kq_errno = event_list[i].fflags;
}
ev->ready = 1;
break;
case EVFILT_VNODE:
ev->kq_vnode = 1;
break;
case EVFILT_AIO:
ev->complete = 1;
ev->ready = 1;
break;
default:
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"unexpected kevent() filter %d",
event_list[i].filter);
continue;
}
if (flags & NGX_POST_EVENTS) {
queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
&ngx_posted_events);
ngx_locked_post_event(ev, queue);
continue;
}
ev->handler(ev);
}
ngx_mutex_unlock(ngx_posted_events_mutex);
return NGX_OK;
}
static ngx_int_t
ngx_kqueue_process_changes(ngx_cycle_t *cycle, ngx_uint_t try)
{
int n;
ngx_int_t rc;
ngx_err_t err;
struct timespec ts;
struct kevent *changes;
ngx_mutex_lock(kevent_mutex);
ngx_mutex_lock(list_mutex);
if (nchanges == 0) {
ngx_mutex_unlock(list_mutex);
ngx_mutex_unlock(kevent_mutex);
return NGX_OK;
}
changes = change_list;
if (change_list == change_list0) {
change_list = change_list1;
} else {
change_list = change_list0;
}
n = nchanges;
nchanges = 0;
ngx_mutex_unlock(list_mutex);
ts.tv_sec = 0;
ts.tv_nsec = 0;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"kevent changes: %d", n);
if (kevent(ngx_kqueue, changes, n, NULL, 0, &ts) == -1) {
err = ngx_errno;
ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
cycle->log, err, "kevent() failed");
rc = NGX_ERROR;
} else {
rc = NGX_OK;
}
ngx_mutex_unlock(kevent_mutex);
return rc;
}
static ngx_inline void
ngx_kqueue_dump_event(ngx_log_t *log, struct kevent *kev)
{
ngx_log_debug6(NGX_LOG_DEBUG_EVENT, log, 0,
(kev->ident > 0x8000000 && kev->ident != (unsigned) -1) ?
"kevent: %p: ft:%d fl:%04Xd ff:%08Xd d:%d ud:%p":
"kevent: %d: ft:%d fl:%04Xd ff:%08Xd d:%d ud:%p",
kev->ident, kev->filter,
kev->flags, kev->fflags,
kev->data, kev->udata);
}
static void *
ngx_kqueue_create_conf(ngx_cycle_t *cycle)
{
ngx_kqueue_conf_t *kcf;
kcf = ngx_palloc(cycle->pool, sizeof(ngx_kqueue_conf_t));
if (kcf == NULL) {
return NGX_CONF_ERROR;
}
kcf->changes = NGX_CONF_UNSET;
kcf->events = NGX_CONF_UNSET;
return kcf;
}
static char *
ngx_kqueue_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_kqueue_conf_t *kcf = conf;
ngx_conf_init_value(kcf->changes, 512);
ngx_conf_init_value(kcf->events, 512);
return NGX_CONF_OK;
}