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srs/trunk/3rdparty/st-srs/event.c

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/* SPDX-License-Identifier: MPL-1.1 OR GPL-2.0-or-later */
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape Portable Runtime library.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1994-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s): Silicon Graphics, Inc.
* Yahoo! Inc.
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include "common.h"
#ifdef MD_HAVE_KQUEUE
#include <sys/event.h>
#endif
#ifdef MD_HAVE_EPOLL
#include <sys/epoll.h>
#endif
// Global stat.
#if defined(DEBUG) && defined(DEBUG_STATS)
__thread unsigned long long _st_stat_epoll = 0;
__thread unsigned long long _st_stat_epoll_zero = 0;
__thread unsigned long long _st_stat_epoll_shake = 0;
__thread unsigned long long _st_stat_epoll_spin = 0;
#endif
#if !defined(MD_HAVE_KQUEUE) && !defined(MD_HAVE_EPOLL) && !defined(MD_HAVE_SELECT)
#error Only support epoll(for Linux), kqueue(for Darwin) or select(for Cygwin)
#endif
#ifdef MD_HAVE_SELECT
static struct _st_seldata {
fd_set fd_read_set, fd_write_set, fd_exception_set;
int fd_ref_cnts[FD_SETSIZE][3];
int maxfd;
} *_st_select_data;
#define _ST_SELECT_MAX_OSFD (_st_select_data->maxfd)
#define _ST_SELECT_READ_SET (_st_select_data->fd_read_set)
#define _ST_SELECT_WRITE_SET (_st_select_data->fd_write_set)
#define _ST_SELECT_EXCEP_SET (_st_select_data->fd_exception_set)
#define _ST_SELECT_READ_CNT(fd) (_st_select_data->fd_ref_cnts[fd][0])
#define _ST_SELECT_WRITE_CNT(fd) (_st_select_data->fd_ref_cnts[fd][1])
#define _ST_SELECT_EXCEP_CNT(fd) (_st_select_data->fd_ref_cnts[fd][2])
#endif
#ifdef MD_HAVE_KQUEUE
typedef struct _kq_fd_data {
int rd_ref_cnt;
int wr_ref_cnt;
int revents;
} _kq_fd_data_t;
static __thread struct _st_kqdata {
_kq_fd_data_t *fd_data;
struct kevent *evtlist;
struct kevent *addlist;
struct kevent *dellist;
int fd_data_size;
int evtlist_size;
int addlist_size;
int addlist_cnt;
int dellist_size;
int dellist_cnt;
int kq;
pid_t pid;
} *_st_kq_data;
#ifndef ST_KQ_MIN_EVTLIST_SIZE
#define ST_KQ_MIN_EVTLIST_SIZE 64
#endif
#define _ST_KQ_READ_CNT(fd) (_st_kq_data->fd_data[fd].rd_ref_cnt)
#define _ST_KQ_WRITE_CNT(fd) (_st_kq_data->fd_data[fd].wr_ref_cnt)
#define _ST_KQ_REVENTS(fd) (_st_kq_data->fd_data[fd].revents)
#endif /* MD_HAVE_KQUEUE */
#ifdef MD_HAVE_EPOLL
typedef struct _epoll_fd_data {
int rd_ref_cnt;
int wr_ref_cnt;
int ex_ref_cnt;
int revents;
} _epoll_fd_data_t;
static __thread struct _st_epolldata {
_epoll_fd_data_t *fd_data;
struct epoll_event *evtlist;
int fd_data_size;
int evtlist_size;
int evtlist_cnt;
int fd_hint;
int epfd;
} *_st_epoll_data;
#ifndef ST_EPOLL_EVTLIST_SIZE
/* Not a limit, just a hint */
#define ST_EPOLL_EVTLIST_SIZE 4096
#endif
#define _ST_EPOLL_READ_CNT(fd) (_st_epoll_data->fd_data[fd].rd_ref_cnt)
#define _ST_EPOLL_WRITE_CNT(fd) (_st_epoll_data->fd_data[fd].wr_ref_cnt)
#define _ST_EPOLL_EXCEP_CNT(fd) (_st_epoll_data->fd_data[fd].ex_ref_cnt)
#define _ST_EPOLL_REVENTS(fd) (_st_epoll_data->fd_data[fd].revents)
#define _ST_EPOLL_READ_BIT(fd) (_ST_EPOLL_READ_CNT(fd) ? EPOLLIN : 0)
#define _ST_EPOLL_WRITE_BIT(fd) (_ST_EPOLL_WRITE_CNT(fd) ? EPOLLOUT : 0)
#define _ST_EPOLL_EXCEP_BIT(fd) (_ST_EPOLL_EXCEP_CNT(fd) ? EPOLLPRI : 0)
#define _ST_EPOLL_EVENTS(fd) \
(_ST_EPOLL_READ_BIT(fd)|_ST_EPOLL_WRITE_BIT(fd)|_ST_EPOLL_EXCEP_BIT(fd))
#endif /* MD_HAVE_EPOLL */
__thread _st_eventsys_t *_st_eventsys = NULL;
#ifdef MD_HAVE_SELECT
/*****************************************
* select event system
*/
ST_HIDDEN int _st_select_init(void)
{
_st_select_data = (struct _st_seldata *) malloc(sizeof(*_st_select_data));
if (!_st_select_data)
return -1;
memset(_st_select_data, 0, sizeof(*_st_select_data));
_st_select_data->maxfd = -1;
return 0;
}
ST_HIDDEN int _st_select_pollset_add(struct pollfd *pds, int npds)
{
struct pollfd *pd;
struct pollfd *epd = pds + npds;
/* Do checks up front */
for (pd = pds; pd < epd; pd++) {
if (pd->fd < 0 || pd->fd >= FD_SETSIZE || !pd->events ||
(pd->events & ~(POLLIN | POLLOUT | POLLPRI))) {
errno = EINVAL;
return -1;
}
}
for (pd = pds; pd < epd; pd++) {
if (pd->events & POLLIN) {
FD_SET(pd->fd, &_ST_SELECT_READ_SET);
_ST_SELECT_READ_CNT(pd->fd)++;
}
if (pd->events & POLLOUT) {
FD_SET(pd->fd, &_ST_SELECT_WRITE_SET);
_ST_SELECT_WRITE_CNT(pd->fd)++;
}
if (pd->events & POLLPRI) {
FD_SET(pd->fd, &_ST_SELECT_EXCEP_SET);
_ST_SELECT_EXCEP_CNT(pd->fd)++;
}
if (_ST_SELECT_MAX_OSFD < pd->fd)
_ST_SELECT_MAX_OSFD = pd->fd;
}
return 0;
}
ST_HIDDEN void _st_select_pollset_del(struct pollfd *pds, int npds)
{
struct pollfd *pd;
struct pollfd *epd = pds + npds;
for (pd = pds; pd < epd; pd++) {
if (pd->events & POLLIN) {
if (--_ST_SELECT_READ_CNT(pd->fd) == 0)
FD_CLR(pd->fd, &_ST_SELECT_READ_SET);
}
if (pd->events & POLLOUT) {
if (--_ST_SELECT_WRITE_CNT(pd->fd) == 0)
FD_CLR(pd->fd, &_ST_SELECT_WRITE_SET);
}
if (pd->events & POLLPRI) {
if (--_ST_SELECT_EXCEP_CNT(pd->fd) == 0)
FD_CLR(pd->fd, &_ST_SELECT_EXCEP_SET);
}
}
}
ST_HIDDEN void _st_select_find_bad_fd(void)
{
_st_clist_t *q;
_st_pollq_t *pq;
int notify;
struct pollfd *pds, *epds;
int pq_max_osfd, osfd;
short events;
_ST_SELECT_MAX_OSFD = -1;
for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
pq = _ST_POLLQUEUE_PTR(q);
notify = 0;
epds = pq->pds + pq->npds;
pq_max_osfd = -1;
for (pds = pq->pds; pds < epds; pds++) {
osfd = pds->fd;
pds->revents = 0;
if (pds->events == 0)
continue;
if (fcntl(osfd, F_GETFL, 0) < 0) {
pds->revents = POLLNVAL;
notify = 1;
}
if (osfd > pq_max_osfd) {
pq_max_osfd = osfd;
}
}
if (notify) {
ST_REMOVE_LINK(&pq->links);
pq->on_ioq = 0;
/*
* Decrement the count of descriptors for each descriptor/event
* because this I/O request is being removed from the ioq
*/
for (pds = pq->pds; pds < epds; pds++) {
osfd = pds->fd;
events = pds->events;
if (events & POLLIN) {
if (--_ST_SELECT_READ_CNT(osfd) == 0) {
FD_CLR(osfd, &_ST_SELECT_READ_SET);
}
}
if (events & POLLOUT) {
if (--_ST_SELECT_WRITE_CNT(osfd) == 0) {
FD_CLR(osfd, &_ST_SELECT_WRITE_SET);
}
}
if (events & POLLPRI) {
if (--_ST_SELECT_EXCEP_CNT(osfd) == 0) {
FD_CLR(osfd, &_ST_SELECT_EXCEP_SET);
}
}
}
if (pq->thread->flags & _ST_FL_ON_SLEEPQ)
_ST_DEL_SLEEPQ(pq->thread);
pq->thread->state = _ST_ST_RUNNABLE;
_ST_ADD_RUNQ(pq->thread);
} else {
if (_ST_SELECT_MAX_OSFD < pq_max_osfd)
_ST_SELECT_MAX_OSFD = pq_max_osfd;
}
}
}
ST_HIDDEN void _st_select_dispatch(void)
{
struct timeval timeout, *tvp;
fd_set r, w, e;
fd_set *rp, *wp, *ep;
int nfd, pq_max_osfd, osfd;
_st_clist_t *q;
st_utime_t min_timeout;
_st_pollq_t *pq;
int notify;
struct pollfd *pds, *epds;
short events, revents;
/*
* Assignment of fd_sets
*/
r = _ST_SELECT_READ_SET;
w = _ST_SELECT_WRITE_SET;
e = _ST_SELECT_EXCEP_SET;
rp = &r;
wp = &w;
ep = &e;
if (_ST_SLEEPQ == NULL) {
tvp = NULL;
} else {
min_timeout = (_ST_SLEEPQ->due <= _ST_LAST_CLOCK) ? 0 :
(_ST_SLEEPQ->due - _ST_LAST_CLOCK);
timeout.tv_sec = (int) (min_timeout / 1000000);
timeout.tv_usec = (int) (min_timeout % 1000000);
tvp = &timeout;
}
/* Check for I/O operations */
nfd = select(_ST_SELECT_MAX_OSFD + 1, rp, wp, ep, tvp);
/* Notify threads that are associated with the selected descriptors */
if (nfd > 0) {
_ST_SELECT_MAX_OSFD = -1;
for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
pq = _ST_POLLQUEUE_PTR(q);
notify = 0;
epds = pq->pds + pq->npds;
pq_max_osfd = -1;
for (pds = pq->pds; pds < epds; pds++) {
osfd = pds->fd;
events = pds->events;
revents = 0;
if ((events & POLLIN) && FD_ISSET(osfd, rp)) {
revents |= POLLIN;
}
if ((events & POLLOUT) && FD_ISSET(osfd, wp)) {
revents |= POLLOUT;
}
if ((events & POLLPRI) && FD_ISSET(osfd, ep)) {
revents |= POLLPRI;
}
pds->revents = revents;
if (revents) {
notify = 1;
}
if (osfd > pq_max_osfd) {
pq_max_osfd = osfd;
}
}
if (notify) {
ST_REMOVE_LINK(&pq->links);
pq->on_ioq = 0;
/*
* Decrement the count of descriptors for each descriptor/event
* because this I/O request is being removed from the ioq
*/
for (pds = pq->pds; pds < epds; pds++) {
osfd = pds->fd;
events = pds->events;
if (events & POLLIN) {
if (--_ST_SELECT_READ_CNT(osfd) == 0) {
FD_CLR(osfd, &_ST_SELECT_READ_SET);
}
}
if (events & POLLOUT) {
if (--_ST_SELECT_WRITE_CNT(osfd) == 0) {
FD_CLR(osfd, &_ST_SELECT_WRITE_SET);
}
}
if (events & POLLPRI) {
if (--_ST_SELECT_EXCEP_CNT(osfd) == 0) {
FD_CLR(osfd, &_ST_SELECT_EXCEP_SET);
}
}
}
if (pq->thread->flags & _ST_FL_ON_SLEEPQ)
_ST_DEL_SLEEPQ(pq->thread);
pq->thread->state = _ST_ST_RUNNABLE;
_ST_ADD_RUNQ(pq->thread);
} else {
if (_ST_SELECT_MAX_OSFD < pq_max_osfd)
_ST_SELECT_MAX_OSFD = pq_max_osfd;
}
}
} else if (nfd < 0) {
/*
* It can happen when a thread closes file descriptor
* that is being used by some other thread -- BAD!
*/
if (errno == EBADF)
_st_select_find_bad_fd();
}
}
ST_HIDDEN int _st_select_fd_new(int osfd)
{
if (osfd >= FD_SETSIZE) {
errno = EMFILE;
return -1;
}
return 0;
}
ST_HIDDEN int _st_select_fd_close(int osfd)
{
if (_ST_SELECT_READ_CNT(osfd) || _ST_SELECT_WRITE_CNT(osfd) ||
_ST_SELECT_EXCEP_CNT(osfd)) {
errno = EBUSY;
return -1;
}
return 0;
}
ST_HIDDEN int _st_select_fd_getlimit(void)
{
return FD_SETSIZE;
}
ST_HIDDEN void _st_select_destroy(void)
{
/* TODO: FIXME: Implements it */
}
static _st_eventsys_t _st_select_eventsys = {
"select",
ST_EVENTSYS_SELECT,
_st_select_init,
_st_select_dispatch,
_st_select_pollset_add,
_st_select_pollset_del,
_st_select_fd_new,
_st_select_fd_close,
_st_select_fd_getlimit,
_st_select_destroy
};
#endif
#ifdef MD_HAVE_KQUEUE
/*****************************************
* kqueue event system
*/
ST_HIDDEN int _st_kq_init(void)
{
int err = 0;
int rv = 0;
_st_kq_data = (struct _st_kqdata *) calloc(1, sizeof(*_st_kq_data));
if (!_st_kq_data)
return -1;
if ((_st_kq_data->kq = kqueue()) < 0) {
err = errno;
rv = -1;
goto cleanup_kq;
}
fcntl(_st_kq_data->kq, F_SETFD, FD_CLOEXEC);
_st_kq_data->pid = getpid();
/*
* Allocate file descriptor data array.
* FD_SETSIZE looks like good initial size.
*/
_st_kq_data->fd_data_size = FD_SETSIZE;
_st_kq_data->fd_data = (_kq_fd_data_t *)calloc(_st_kq_data->fd_data_size, sizeof(_kq_fd_data_t));
if (!_st_kq_data->fd_data) {
err = errno;
rv = -1;
goto cleanup_kq;
}
/* Allocate event lists */
_st_kq_data->evtlist_size = ST_KQ_MIN_EVTLIST_SIZE;
_st_kq_data->evtlist = (struct kevent *)malloc(_st_kq_data->evtlist_size * sizeof(struct kevent));
_st_kq_data->addlist_size = ST_KQ_MIN_EVTLIST_SIZE;
_st_kq_data->addlist = (struct kevent *)malloc(_st_kq_data->addlist_size * sizeof(struct kevent));
_st_kq_data->dellist_size = ST_KQ_MIN_EVTLIST_SIZE;
_st_kq_data->dellist = (struct kevent *)malloc(_st_kq_data->dellist_size * sizeof(struct kevent));
if (!_st_kq_data->evtlist || !_st_kq_data->addlist ||
!_st_kq_data->dellist) {
err = ENOMEM;
rv = -1;
}
cleanup_kq:
if (rv < 0) {
if (_st_kq_data->kq >= 0)
close(_st_kq_data->kq);
free(_st_kq_data->fd_data);
free(_st_kq_data->evtlist);
free(_st_kq_data->addlist);
free(_st_kq_data->dellist);
free(_st_kq_data);
_st_kq_data = NULL;
errno = err;
}
return rv;
}
ST_HIDDEN int _st_kq_fd_data_expand(int maxfd)
{
_kq_fd_data_t *ptr;
int n = _st_kq_data->fd_data_size;
while (maxfd >= n)
n <<= 1;
ptr = (_kq_fd_data_t *)realloc(_st_kq_data->fd_data, n * sizeof(_kq_fd_data_t));
if (!ptr)
return -1;
memset(ptr + _st_kq_data->fd_data_size, 0, (n - _st_kq_data->fd_data_size) * sizeof(_kq_fd_data_t));
_st_kq_data->fd_data = ptr;
_st_kq_data->fd_data_size = n;
return 0;
}
ST_HIDDEN int _st_kq_addlist_expand(int avail)
{
struct kevent *ptr;
int n = _st_kq_data->addlist_size;
while (avail > n - _st_kq_data->addlist_cnt)
n <<= 1;
ptr = (struct kevent *)realloc(_st_kq_data->addlist, n * sizeof(struct kevent));
if (!ptr)
return -1;
_st_kq_data->addlist = ptr;
_st_kq_data->addlist_size = n;
/*
* Try to expand the result event list too
* (although we don't have to do it).
*/
ptr = (struct kevent *)realloc(_st_kq_data->evtlist, n * sizeof(struct kevent));
if (ptr) {
_st_kq_data->evtlist = ptr;
_st_kq_data->evtlist_size = n;
}
return 0;
}
ST_HIDDEN void _st_kq_addlist_add(const struct kevent *kev)
{
ST_ASSERT(_st_kq_data->addlist_cnt < _st_kq_data->addlist_size);
memcpy(_st_kq_data->addlist + _st_kq_data->addlist_cnt, kev, sizeof(struct kevent));
_st_kq_data->addlist_cnt++;
}
ST_HIDDEN void _st_kq_dellist_add(const struct kevent *kev)
{
int n = _st_kq_data->dellist_size;
if (_st_kq_data->dellist_cnt >= n) {
struct kevent *ptr;
n <<= 1;
ptr = (struct kevent *)realloc(_st_kq_data->dellist, n * sizeof(struct kevent));
if (!ptr) {
/* See comment in _st_kq_pollset_del() */
return;
}
_st_kq_data->dellist = ptr;
_st_kq_data->dellist_size = n;
}
memcpy(_st_kq_data->dellist + _st_kq_data->dellist_cnt, kev, sizeof(struct kevent));
_st_kq_data->dellist_cnt++;
}
ST_HIDDEN int _st_kq_pollset_add(struct pollfd *pds, int npds)
{
struct kevent kev;
struct pollfd *pd;
struct pollfd *epd = pds + npds;
/*
* Pollset adding is "atomic". That is, either it succeeded for
* all descriptors in the set or it failed. It means that we
* need to do all the checks up front so we don't have to
* "unwind" if adding of one of the descriptors failed.
*/
for (pd = pds; pd < epd; pd++) {
/* POLLIN and/or POLLOUT must be set, but nothing else */
if (pd->fd < 0 || !pd->events || (pd->events & ~(POLLIN | POLLOUT))) {
errno = EINVAL;
return -1;
}
if (pd->fd >= _st_kq_data->fd_data_size &&
_st_kq_fd_data_expand(pd->fd) < 0)
return -1;
}
/*
* Make sure we have enough room in the addlist for twice as many
* descriptors as in the pollset (for both READ and WRITE filters).
*/
npds <<= 1;
if (npds > _st_kq_data->addlist_size - _st_kq_data->addlist_cnt && _st_kq_addlist_expand(npds) < 0)
return -1;
for (pd = pds; pd < epd; pd++) {
if ((pd->events & POLLIN) && (_ST_KQ_READ_CNT(pd->fd)++ == 0)) {
memset(&kev, 0, sizeof(kev));
kev.ident = pd->fd;
kev.filter = EVFILT_READ;
#ifdef NOTE_EOF
/* Make it behave like select() and poll() */
kev.fflags = NOTE_EOF;
#endif
kev.flags = (EV_ADD | EV_ONESHOT);
_st_kq_addlist_add(&kev);
}
if ((pd->events & POLLOUT) && (_ST_KQ_WRITE_CNT(pd->fd)++ == 0)) {
memset(&kev, 0, sizeof(kev));
kev.ident = pd->fd;
kev.filter = EVFILT_WRITE;
kev.flags = (EV_ADD | EV_ONESHOT);
_st_kq_addlist_add(&kev);
}
}
return 0;
}
ST_HIDDEN void _st_kq_pollset_del(struct pollfd *pds, int npds)
{
struct kevent kev;
struct pollfd *pd;
struct pollfd *epd = pds + npds;
/*
* It's OK if deleting fails because a descriptor will either be
* closed or fire only once (we set EV_ONESHOT flag).
*/
_st_kq_data->dellist_cnt = 0;
for (pd = pds; pd < epd; pd++) {
if ((pd->events & POLLIN) && (--_ST_KQ_READ_CNT(pd->fd) == 0)) {
memset(&kev, 0, sizeof(kev));
kev.ident = pd->fd;
kev.filter = EVFILT_READ;
kev.flags = EV_DELETE;
_st_kq_dellist_add(&kev);
}
if ((pd->events & POLLOUT) && (--_ST_KQ_WRITE_CNT(pd->fd) == 0)) {
memset(&kev, 0, sizeof(kev));
kev.ident = pd->fd;
kev.filter = EVFILT_WRITE;
kev.flags = EV_DELETE;
_st_kq_dellist_add(&kev);
}
}
if (_st_kq_data->dellist_cnt > 0) {
/*
* We do "synchronous" kqueue deletes to avoid deleting
* closed descriptors and other possible problems.
*/
int rv;
do {
/* This kevent() won't block since result list size is 0 */
rv = kevent(_st_kq_data->kq, _st_kq_data->dellist, _st_kq_data->dellist_cnt, NULL, 0, NULL);
} while (rv < 0 && errno == EINTR);
}
}
ST_HIDDEN void _st_kq_dispatch(void)
{
struct timespec timeout, *tsp;
struct kevent kev;
st_utime_t min_timeout;
_st_clist_t *q;
_st_pollq_t *pq;
struct pollfd *pds, *epds;
int nfd, i, osfd, notify, filter;
short events, revents;
if (_ST_SLEEPQ == NULL) {
tsp = NULL;
} else {
min_timeout = (_ST_SLEEPQ->due <= _ST_LAST_CLOCK) ? 0 : (_ST_SLEEPQ->due - _ST_LAST_CLOCK);
timeout.tv_sec = (time_t) (min_timeout / 1000000);
timeout.tv_nsec = (long) ((min_timeout % 1000000) * 1000);
tsp = &timeout;
}
retry_kevent:
/* Check for I/O operations */
nfd = kevent(_st_kq_data->kq,
_st_kq_data->addlist, _st_kq_data->addlist_cnt,
_st_kq_data->evtlist, _st_kq_data->evtlist_size, tsp);
_st_kq_data->addlist_cnt = 0;
if (nfd > 0) {
for (i = 0; i < nfd; i++) {
osfd = _st_kq_data->evtlist[i].ident;
filter = _st_kq_data->evtlist[i].filter;
if (filter == EVFILT_READ) {
_ST_KQ_REVENTS(osfd) |= POLLIN;
} else if (filter == EVFILT_WRITE) {
_ST_KQ_REVENTS(osfd) |= POLLOUT;
}
if (_st_kq_data->evtlist[i].flags & EV_ERROR) {
if (_st_kq_data->evtlist[i].data == EBADF) {
_ST_KQ_REVENTS(osfd) |= POLLNVAL;
} else {
_ST_KQ_REVENTS(osfd) |= POLLERR;
}
}
}
_st_kq_data->dellist_cnt = 0;
for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
pq = _ST_POLLQUEUE_PTR(q);
notify = 0;
epds = pq->pds + pq->npds;
for (pds = pq->pds; pds < epds; pds++) {
osfd = pds->fd;
events = pds->events;
revents = (short)(_ST_KQ_REVENTS(osfd) & ~(POLLIN | POLLOUT));
if ((events & POLLIN) && (_ST_KQ_REVENTS(osfd) & POLLIN)) {
revents |= POLLIN;
}
if ((events & POLLOUT) && (_ST_KQ_REVENTS(osfd) & POLLOUT)) {
revents |= POLLOUT;
}
pds->revents = revents;
if (revents) {
notify = 1;
}
}
if (notify) {
ST_REMOVE_LINK(&pq->links);
pq->on_ioq = 0;
for (pds = pq->pds; pds < epds; pds++) {
osfd = pds->fd;
events = pds->events;
/*
* We set EV_ONESHOT flag so we only need to delete
* descriptor if it didn't fire.
*/
if ((events & POLLIN) && (--_ST_KQ_READ_CNT(osfd) == 0) && ((_ST_KQ_REVENTS(osfd) & POLLIN) == 0)) {
memset(&kev, 0, sizeof(kev));
kev.ident = osfd;
kev.filter = EVFILT_READ;
kev.flags = EV_DELETE;
_st_kq_dellist_add(&kev);
}
if ((events & POLLOUT) && (--_ST_KQ_WRITE_CNT(osfd) == 0) && ((_ST_KQ_REVENTS(osfd) & POLLOUT) == 0)) {
memset(&kev, 0, sizeof(kev));
kev.ident = osfd;
kev.filter = EVFILT_WRITE;
kev.flags = EV_DELETE;
_st_kq_dellist_add(&kev);
}
}
if (pq->thread->flags & _ST_FL_ON_SLEEPQ)
_ST_DEL_SLEEPQ(pq->thread);
pq->thread->state = _ST_ST_RUNNABLE;
_ST_ADD_RUNQ(pq->thread);
}
}
if (_st_kq_data->dellist_cnt > 0) {
int rv;
do {
/* This kevent() won't block since result list size is 0 */
rv = kevent(_st_kq_data->kq, _st_kq_data->dellist, _st_kq_data->dellist_cnt, NULL, 0, NULL);
} while (rv < 0 && errno == EINTR);
}
for (i = 0; i < nfd; i++) {
osfd = _st_kq_data->evtlist[i].ident;
_ST_KQ_REVENTS(osfd) = 0;
}
} else if (nfd < 0) {
if (errno == EBADF && _st_kq_data->pid != getpid()) {
/* We probably forked, reinitialize kqueue */
if ((_st_kq_data->kq = kqueue()) < 0) {
/* There is nothing we can do here, will retry later */
return;
}
fcntl(_st_kq_data->kq, F_SETFD, FD_CLOEXEC);
_st_kq_data->pid = getpid();
/* Re-register all descriptors on ioq with new kqueue */
memset(_st_kq_data->fd_data, 0, _st_kq_data->fd_data_size * sizeof(_kq_fd_data_t));
for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
pq = _ST_POLLQUEUE_PTR(q);
_st_kq_pollset_add(pq->pds, pq->npds);
}
goto retry_kevent;
}
}
}
ST_HIDDEN int _st_kq_fd_new(int osfd)
{
if (osfd >= _st_kq_data->fd_data_size && _st_kq_fd_data_expand(osfd) < 0)
return -1;
return 0;
}
ST_HIDDEN int _st_kq_fd_close(int osfd)
{
if (_ST_KQ_READ_CNT(osfd) || _ST_KQ_WRITE_CNT(osfd)) {
errno = EBUSY;
return -1;
}
return 0;
}
ST_HIDDEN int _st_kq_fd_getlimit(void)
{
/* zero means no specific limit */
return 0;
}
ST_HIDDEN void _st_kq_destroy(void)
{
/* TODO: FIXME: Implements it */
}
static _st_eventsys_t _st_kq_eventsys = {
"kqueue",
ST_EVENTSYS_ALT,
_st_kq_init,
_st_kq_dispatch,
_st_kq_pollset_add,
_st_kq_pollset_del,
_st_kq_fd_new,
_st_kq_fd_close,
_st_kq_fd_getlimit,
_st_kq_destroy
};
#endif /* MD_HAVE_KQUEUE */
#ifdef MD_HAVE_EPOLL
/*****************************************
* epoll event system
*/
ST_HIDDEN int _st_epoll_init(void)
{
int fdlim;
int err = 0;
int rv = 0;
_st_epoll_data = (struct _st_epolldata *) calloc(1, sizeof(*_st_epoll_data));
if (!_st_epoll_data)
return -1;
fdlim = st_getfdlimit();
_st_epoll_data->fd_hint = (fdlim > 0 && fdlim < ST_EPOLL_EVTLIST_SIZE) ? fdlim : ST_EPOLL_EVTLIST_SIZE;
if ((_st_epoll_data->epfd = epoll_create(_st_epoll_data->fd_hint)) < 0) {
err = errno;
rv = -1;
goto cleanup_epoll;
}
fcntl(_st_epoll_data->epfd, F_SETFD, FD_CLOEXEC);
/* Allocate file descriptor data array */
_st_epoll_data->fd_data_size = _st_epoll_data->fd_hint;
_st_epoll_data->fd_data = (_epoll_fd_data_t *)calloc(_st_epoll_data->fd_data_size, sizeof(_epoll_fd_data_t));
if (!_st_epoll_data->fd_data) {
err = errno;
rv = -1;
goto cleanup_epoll;
}
/* Allocate event lists */
_st_epoll_data->evtlist_size = _st_epoll_data->fd_hint;
_st_epoll_data->evtlist = (struct epoll_event *)malloc(_st_epoll_data->evtlist_size * sizeof(struct epoll_event));
if (!_st_epoll_data->evtlist) {
err = errno;
rv = -1;
}
cleanup_epoll:
if (rv < 0) {
if (_st_epoll_data->epfd >= 0)
close(_st_epoll_data->epfd);
free(_st_epoll_data->fd_data);
free(_st_epoll_data->evtlist);
free(_st_epoll_data);
_st_epoll_data = NULL;
errno = err;
}
return rv;
}
ST_HIDDEN int _st_epoll_fd_data_expand(int maxfd)
{
_epoll_fd_data_t *ptr;
int n = _st_epoll_data->fd_data_size;
while (maxfd >= n)
n <<= 1;
ptr = (_epoll_fd_data_t *)realloc(_st_epoll_data->fd_data, n * sizeof(_epoll_fd_data_t));
if (!ptr)
return -1;
memset(ptr + _st_epoll_data->fd_data_size, 0, (n - _st_epoll_data->fd_data_size) * sizeof(_epoll_fd_data_t));
_st_epoll_data->fd_data = ptr;
_st_epoll_data->fd_data_size = n;
return 0;
}
ST_HIDDEN void _st_epoll_evtlist_expand(void)
{
struct epoll_event *ptr;
int n = _st_epoll_data->evtlist_size;
while (_st_epoll_data->evtlist_cnt > n)
n <<= 1;
ptr = (struct epoll_event *)realloc(_st_epoll_data->evtlist, n * sizeof(struct epoll_event));
if (ptr) {
_st_epoll_data->evtlist = ptr;
_st_epoll_data->evtlist_size = n;
}
}
ST_HIDDEN void _st_epoll_pollset_del(struct pollfd *pds, int npds)
{
struct epoll_event ev;
struct pollfd *pd;
struct pollfd *epd = pds + npds;
int old_events, events, op;
/*
* It's more or less OK if deleting fails because a descriptor
* will either be closed or deleted in dispatch function after
* it fires.
*/
for (pd = pds; pd < epd; pd++) {
old_events = _ST_EPOLL_EVENTS(pd->fd);
if (pd->events & POLLIN)
_ST_EPOLL_READ_CNT(pd->fd)--;
if (pd->events & POLLOUT)
_ST_EPOLL_WRITE_CNT(pd->fd)--;
if (pd->events & POLLPRI)
_ST_EPOLL_EXCEP_CNT(pd->fd)--;
events = _ST_EPOLL_EVENTS(pd->fd);
/*
* The _ST_EPOLL_REVENTS check below is needed so we can use
* this function inside dispatch(). Outside of dispatch()
* _ST_EPOLL_REVENTS is always zero for all descriptors.
*/
if (events != old_events && _ST_EPOLL_REVENTS(pd->fd) == 0) {
op = events ? EPOLL_CTL_MOD : EPOLL_CTL_DEL;
ev.events = events;
ev.data.fd = pd->fd;
if (epoll_ctl(_st_epoll_data->epfd, op, pd->fd, &ev) == 0 && op == EPOLL_CTL_DEL) {
_st_epoll_data->evtlist_cnt--;
}
}
}
}
ST_HIDDEN int _st_epoll_pollset_add(struct pollfd *pds, int npds)
{
struct epoll_event ev;
int i, fd;
int old_events, events, op;
/* Do as many checks as possible up front */
for (i = 0; i < npds; i++) {
fd = pds[i].fd;
if (fd < 0 || !pds[i].events ||
(pds[i].events & ~(POLLIN | POLLOUT | POLLPRI))) {
errno = EINVAL;
return -1;
}
if (fd >= _st_epoll_data->fd_data_size && _st_epoll_fd_data_expand(fd) < 0)
return -1;
}
for (i = 0; i < npds; i++) {
fd = pds[i].fd;
old_events = _ST_EPOLL_EVENTS(fd);
if (pds[i].events & POLLIN)
_ST_EPOLL_READ_CNT(fd)++;
if (pds[i].events & POLLOUT)
_ST_EPOLL_WRITE_CNT(fd)++;
if (pds[i].events & POLLPRI)
_ST_EPOLL_EXCEP_CNT(fd)++;
events = _ST_EPOLL_EVENTS(fd);
if (events != old_events) {
op = old_events ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
ev.events = events;
ev.data.fd = fd;
if (epoll_ctl(_st_epoll_data->epfd, op, fd, &ev) < 0 && (op != EPOLL_CTL_ADD || errno != EEXIST))
break;
if (op == EPOLL_CTL_ADD) {
_st_epoll_data->evtlist_cnt++;
if (_st_epoll_data->evtlist_cnt > _st_epoll_data->evtlist_size)
_st_epoll_evtlist_expand();
}
}
}
if (i < npds) {
/* Error */
int err = errno;
/* Unroll the state */
_st_epoll_pollset_del(pds, i + 1);
errno = err;
return -1;
}
return 0;
}
ST_HIDDEN void _st_epoll_dispatch(void)
{
st_utime_t min_timeout;
_st_clist_t *q;
_st_pollq_t *pq;
struct pollfd *pds, *epds;
struct epoll_event ev;
int timeout, nfd, i, osfd, notify;
int events, op;
short revents;
#if defined(DEBUG) && defined(DEBUG_STATS)
++_st_stat_epoll;
#endif
if (_ST_SLEEPQ == NULL) {
timeout = -1;
} else {
min_timeout = (_ST_SLEEPQ->due <= _ST_LAST_CLOCK) ? 0 : (_ST_SLEEPQ->due - _ST_LAST_CLOCK);
timeout = (int) (min_timeout / 1000);
// At least wait 1ms when <1ms, to avoid epoll_wait spin loop.
if (timeout == 0) {
#if defined(DEBUG) && defined(DEBUG_STATS)
++_st_stat_epoll_zero;
#endif
if (min_timeout > 0) {
#if defined(DEBUG) && defined(DEBUG_STATS)
++_st_stat_epoll_shake;
#endif
timeout = 1;
}
}
}
/* Check for I/O operations */
nfd = epoll_wait(_st_epoll_data->epfd, _st_epoll_data->evtlist, _st_epoll_data->evtlist_size, timeout);
#if defined(DEBUG) && defined(DEBUG_STATS)
if (nfd <= 0) {
++_st_stat_epoll_spin;
}
#endif
if (nfd > 0) {
for (i = 0; i < nfd; i++) {
osfd = _st_epoll_data->evtlist[i].data.fd;
_ST_EPOLL_REVENTS(osfd) = _st_epoll_data->evtlist[i].events;
if (_ST_EPOLL_REVENTS(osfd) & (EPOLLERR | EPOLLHUP)) {
/* Also set I/O bits on error */
_ST_EPOLL_REVENTS(osfd) |= _ST_EPOLL_EVENTS(osfd);
}
}
for (q = _ST_IOQ.next; q != &_ST_IOQ; q = q->next) {
pq = _ST_POLLQUEUE_PTR(q);
notify = 0;
epds = pq->pds + pq->npds;
for (pds = pq->pds; pds < epds; pds++) {
if (_ST_EPOLL_REVENTS(pds->fd) == 0) {
pds->revents = 0;
continue;
}
osfd = pds->fd;
events = pds->events;
revents = 0;
if ((events & POLLIN) && (_ST_EPOLL_REVENTS(osfd) & EPOLLIN))
revents |= POLLIN;
if ((events & POLLOUT) && (_ST_EPOLL_REVENTS(osfd) & EPOLLOUT))
revents |= POLLOUT;
if ((events & POLLPRI) && (_ST_EPOLL_REVENTS(osfd) & EPOLLPRI))
revents |= POLLPRI;
if (_ST_EPOLL_REVENTS(osfd) & EPOLLERR)
revents |= POLLERR;
if (_ST_EPOLL_REVENTS(osfd) & EPOLLHUP)
revents |= POLLHUP;
pds->revents = revents;
if (revents) {
notify = 1;
}
}
if (notify) {
ST_REMOVE_LINK(&pq->links);
pq->on_ioq = 0;
/*
* Here we will only delete/modify descriptors that
* didn't fire (see comments in _st_epoll_pollset_del()).
*/
_st_epoll_pollset_del(pq->pds, pq->npds);
if (pq->thread->flags & _ST_FL_ON_SLEEPQ)
_ST_DEL_SLEEPQ(pq->thread);
pq->thread->state = _ST_ST_RUNNABLE;
_ST_ADD_RUNQ(pq->thread);
}
}
for (i = 0; i < nfd; i++) {
/* Delete/modify descriptors that fired */
osfd = _st_epoll_data->evtlist[i].data.fd;
_ST_EPOLL_REVENTS(osfd) = 0;
events = _ST_EPOLL_EVENTS(osfd);
op = events ? EPOLL_CTL_MOD : EPOLL_CTL_DEL;
ev.events = events;
ev.data.fd = osfd;
if (epoll_ctl(_st_epoll_data->epfd, op, osfd, &ev) == 0 && op == EPOLL_CTL_DEL) {
_st_epoll_data->evtlist_cnt--;
}
}
}
}
ST_HIDDEN int _st_epoll_fd_new(int osfd)
{
if (osfd >= _st_epoll_data->fd_data_size && _st_epoll_fd_data_expand(osfd) < 0)
return -1;
return 0;
}
ST_HIDDEN int _st_epoll_fd_close(int osfd)
{
if (_ST_EPOLL_READ_CNT(osfd) || _ST_EPOLL_WRITE_CNT(osfd) || _ST_EPOLL_EXCEP_CNT(osfd)) {
errno = EBUSY;
return -1;
}
return 0;
}
ST_HIDDEN int _st_epoll_fd_getlimit(void)
{
/* zero means no specific limit */
return 0;
}
/*
* Check if epoll functions are just stubs.
*/
ST_HIDDEN int _st_epoll_is_supported(void)
{
struct epoll_event ev;
ev.events = EPOLLIN;
ev.data.ptr = NULL;
/* Guaranteed to fail */
epoll_ctl(-1, EPOLL_CTL_ADD, -1, &ev);
return (errno != ENOSYS);
}
ST_HIDDEN void _st_epoll_destroy(void)
{
if (_st_epoll_data->epfd >= 0) {
close(_st_epoll_data->epfd);
}
free(_st_epoll_data->fd_data);
free(_st_epoll_data->evtlist);
free(_st_epoll_data);
_st_epoll_data = NULL;
}
static _st_eventsys_t _st_epoll_eventsys = {
"epoll",
ST_EVENTSYS_ALT,
_st_epoll_init,
_st_epoll_dispatch,
_st_epoll_pollset_add,
_st_epoll_pollset_del,
_st_epoll_fd_new,
_st_epoll_fd_close,
_st_epoll_fd_getlimit,
_st_epoll_destroy
};
#endif /* MD_HAVE_EPOLL */
/*****************************************
* Public functions
*/
int st_set_eventsys(int eventsys)
{
if (_st_eventsys) {
errno = EBUSY;
return -1;
}
if (eventsys == ST_EVENTSYS_SELECT || eventsys == ST_EVENTSYS_DEFAULT) {
#if defined (MD_HAVE_SELECT)
_st_eventsys = &_st_select_eventsys;
return 0;
#endif
}
if (eventsys == ST_EVENTSYS_ALT) {
#if defined (MD_HAVE_KQUEUE)
_st_eventsys = &_st_kq_eventsys;
return 0;
#elif defined (MD_HAVE_EPOLL)
if (_st_epoll_is_supported()) {
_st_eventsys = &_st_epoll_eventsys;
return 0;
}
#endif
}
errno = EINVAL;
return -1;
}
int st_get_eventsys(void)
{
return _st_eventsys ? _st_eventsys->val : -1;
}
const char *st_get_eventsys_name(void)
{
return _st_eventsys ? _st_eventsys->name : "";
}
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