is default and caller does not require dedicated thread. timer needs a dedicated thread to maintain overrun count correctly in notification context. mqueue and aio can use thread pool to do notification concurrently, the thread pool has lifecycle control, some threads will exit if they have idled for a while.
183 lines
4.6 KiB
C
183 lines
4.6 KiB
C
/*
|
|
* Copyright (c) 2006 David Xu <davidxu@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <sys/types.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include "namespace.h"
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
#include <stddef.h>
|
|
#include <signal.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include "sigev_thread.h"
|
|
#include "un-namespace.h"
|
|
|
|
extern int __sys_ktimer_create(clockid_t, struct sigevent *__restrict,
|
|
int *__restrict);
|
|
extern int __sys_ktimer_delete(int);
|
|
extern int __sys_ktimer_gettime(int, struct itimerspec *);
|
|
extern int __sys_ktimer_getoverrun(int);
|
|
extern int __sys_ktimer_settime(int, int,
|
|
const struct itimerspec *__restrict, struct itimerspec *__restrict);
|
|
|
|
struct __timer {
|
|
int oshandle;
|
|
struct sigev_node *node;
|
|
};
|
|
|
|
__weak_reference(__timer_create, timer_create);
|
|
__weak_reference(__timer_create, _timer_create);
|
|
__weak_reference(__timer_delete, timer_delete);
|
|
__weak_reference(__timer_delete, _timer_delete);
|
|
__weak_reference(__timer_gettime, timer_gettime);
|
|
__weak_reference(__timer_gettime, _timer_gettime);
|
|
__weak_reference(__timer_settime, timer_settime);
|
|
__weak_reference(__timer_settime, _timer_settime);
|
|
__weak_reference(__timer_getoverrun, timer_getoverrun);
|
|
__weak_reference(__timer_getoverrun, _timer_getoverrun);
|
|
|
|
typedef void (*timer_func)(union sigval val, int overrun);
|
|
|
|
static void
|
|
timer_dispatch(struct sigev_node *sn)
|
|
{
|
|
timer_func f = sn->sn_func;
|
|
|
|
/* I want to avoid expired notification. */
|
|
if (sn->sn_info.si_value.sival_int == sn->sn_gen)
|
|
f(sn->sn_value, sn->sn_info.si_overrun);
|
|
}
|
|
|
|
int
|
|
__timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
|
|
{
|
|
struct __timer *timer;
|
|
struct sigevent ev;
|
|
struct sigev_node *sn;
|
|
int ret, err;
|
|
|
|
timer = malloc(sizeof(struct __timer));
|
|
if (timer == NULL)
|
|
return (-1);
|
|
|
|
if (evp == NULL || evp->sigev_notify != SIGEV_THREAD) {
|
|
ret = __sys_ktimer_create(clockid, evp, &timer->oshandle);
|
|
if (ret == -1) {
|
|
err = errno;
|
|
free(timer);
|
|
errno = err;
|
|
return (ret);
|
|
}
|
|
timer->node = NULL;
|
|
*timerid = timer;
|
|
return (0);
|
|
}
|
|
|
|
if (__sigev_check_init()) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
sn = __sigev_alloc(SI_TIMER, evp, NULL, 0);
|
|
if (sn == NULL) {
|
|
errno = EAGAIN;
|
|
return (-1);
|
|
}
|
|
|
|
__sigev_get_sigevent(sn, &ev, sn->sn_gen);
|
|
ret = __sys_ktimer_create(clockid, &ev, &timer->oshandle);
|
|
if (ret != 0) {
|
|
err = errno;
|
|
__sigev_free(sn);
|
|
free(timer);
|
|
errno = err;
|
|
return (-1);
|
|
}
|
|
sn->sn_dispatch = timer_dispatch;
|
|
sn->sn_id = timer->oshandle;
|
|
timer->node = sn;
|
|
__sigev_list_lock();
|
|
__sigev_register(sn);
|
|
__sigev_list_unlock();
|
|
*timerid = timer;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
__timer_delete(timer_t timerid)
|
|
{
|
|
int ret, err;
|
|
|
|
if (timerid->node != NULL) {
|
|
__sigev_list_lock();
|
|
__sigev_delete_node(timerid->node);
|
|
__sigev_list_unlock();
|
|
}
|
|
ret = __sys_ktimer_delete(timerid->oshandle);
|
|
err = errno;
|
|
free(timerid);
|
|
errno = err;
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
__timer_gettime(timer_t timerid, struct itimerspec *value)
|
|
{
|
|
|
|
return __sys_ktimer_gettime(timerid->oshandle, value);
|
|
}
|
|
|
|
int
|
|
__timer_getoverrun(timer_t timerid)
|
|
{
|
|
|
|
return __sys_ktimer_getoverrun(timerid->oshandle);
|
|
}
|
|
|
|
int
|
|
__timer_settime(timer_t timerid, int flags,
|
|
const struct itimerspec *__restrict value,
|
|
struct itimerspec *__restrict ovalue)
|
|
{
|
|
|
|
return __sys_ktimer_settime(timerid->oshandle,
|
|
flags, value, ovalue);
|
|
}
|
|
|
|
int
|
|
__timer_oshandle(timer_t timerid)
|
|
{
|
|
|
|
return (timerid->oshandle);
|
|
}
|