/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: hooks.c,v 1.26 2014/01/28 16:58:33 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004 - 2014
	by Michael Pounov <misho@elwix.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, 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.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#include "global.h"
#include "hooks.h"


/*
 * sched_hook_init() - Default INIT hook
 *
 * @root = root task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_init(void *root, void *arg __unused)
{
	sched_root_task_t *r = root;

	if (!r)
		return (void*) -1;

#ifndef KQ_DISABLE
	r->root_kq = kqueue();
	if (r->root_kq == -1) {
		LOGERR;
		return (void*) -1;
	}
#else
	r->root_kq ^= r->root_kq;
	FD_ZERO(&r->root_fds[0]);
	FD_ZERO(&r->root_fds[1]);
#endif

	return NULL;
}

/*
 * sched_hook_fini() - Default FINI hook
 *
 * @root = root task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_fini(void *root, void *arg __unused)
{
	sched_root_task_t *r = root;

	if (!r)
		return (void*) -1;

#ifndef KQ_DISABLE
	if (r->root_kq > 2) {
		close(r->root_kq);
		r->root_kq = 0;
	}
#else
	FD_ZERO(&r->root_fds[1]);
	FD_ZERO(&r->root_fds[0]);
	r->root_kq ^= r->root_kq;
#endif

	return NULL;
}

/*
 * sched_hook_cancel() - Default CANCEL hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_cancel(void *task, void *arg __unused)
{
	sched_task_t *t = task;
#ifndef KQ_DISABLE
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };
#else
	sched_root_task_t *r = NULL;
	register int i;
#endif
#ifdef AIO_SUPPORT
	struct aiocb *acb;
#ifdef EVFILT_LIO
	register int i = 0;
	struct aiocb **acbs;
#endif	/* EVFILT_LIO */
#endif	/* AIO_SUPPORT */

	if (!t || !TASK_ROOT(t))
		return (void*) -1;
#ifdef KQ_DISABLE
	r = TASK_ROOT(t);
#endif

	switch (TASK_TYPE(t)) {
		case taskREAD:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_FD(t), EVFILT_READ, EV_DELETE, 0, 0, (intptr_t) TASK_FD(t));
#else
			EV_SET(&chg[0], TASK_FD(t), EVFILT_READ, EV_DELETE, 0, 0, (void*) TASK_FD(t));
#endif
#else
			FD_CLR(TASK_FD(t), &r->root_fds[0]);

			/* optimize select */
			for (i = r->root_kq - 1; i > 2; i--)
				if (FD_ISSET(i, &r->root_fds[0]) || FD_ISSET(i, &r->root_fds[1]))
					break;
			if (i > 2)
				r->root_kq = i + 1;
#endif
			break;
		case taskWRITE:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_FD(t), EVFILT_WRITE, EV_DELETE, 0, 0, (intptr_t) TASK_FD(t));
#else
			EV_SET(&chg[0], TASK_FD(t), EVFILT_WRITE, EV_DELETE, 0, 0, (void*) TASK_FD(t));
#endif
#else
			FD_CLR(TASK_FD(t), &r->root_fds[1]);

			/* optimize select */
			for (i = r->root_kq - 1; i > 2; i--)
				if (FD_ISSET(i, &r->root_fds[0]) || FD_ISSET(i, &r->root_fds[1]))
					break;
			if (i > 2)
				r->root_kq = i + 1;
#endif
			break;
		case taskALARM:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], (uintptr_t) TASK_DATA(t), EVFILT_TIMER, EV_DELETE, 
					0, 0, (intptr_t) TASK_DATA(t));
#else
			EV_SET(&chg[0], (uintptr_t) TASK_DATA(t), EVFILT_TIMER, EV_DELETE, 
					0, 0, (void*) TASK_DATA(t));
#endif
#endif
			break;
		case taskNODE:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_FD(t), EVFILT_VNODE, EV_DELETE, 0, 0, (intptr_t) TASK_FD(t));
#else
			EV_SET(&chg[0], TASK_FD(t), EVFILT_VNODE, EV_DELETE, 0, 0, (void*) TASK_FD(t));
#endif
#endif
			break;
		case taskPROC:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_PROC, EV_DELETE, 0, 0, (intptr_t) TASK_VAL(t));
#else
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_PROC, EV_DELETE, 0, 0, (void*) TASK_VAL(t));
#endif
#endif
			break;
		case taskSIGNAL:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_SIGNAL, EV_DELETE, 0, 0, (intptr_t) TASK_VAL(t));
#else
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_SIGNAL, EV_DELETE, 0, 0, (void*) TASK_VAL(t));
#endif
			/* restore signal */
			signal(TASK_VAL(t), SIG_DFL);
#endif
			break;
#ifdef AIO_SUPPORT
		case taskAIO:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_AIO, EV_DELETE, 0, 0, (intptr_t) TASK_VAL(t));
#else
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_AIO, EV_DELETE, 0, 0, (void*) TASK_VAL(t));
#endif
			acb = (struct aiocb*) TASK_VAL(t);
			if (acb) {
				if (aio_cancel(acb->aio_fildes, acb) == AIO_CANCELED)
					aio_return(acb);
				free(acb);
				TASK_VAL(t) = 0;
			}
#endif
			break;
#ifdef EVFILT_LIO
		case taskLIO:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_LIO, EV_DELETE, 0, 0, (intptr_t) TASK_VAL(t));
#else
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_LIO, EV_DELETE, 0, 0, (void*) TASK_VAL(t));
#endif
			acbs = (struct aiocb**) TASK_VAL(t);
			if (acbs) {
				for (i = 0; i < TASK_DATLEN(t); i++) {
					if (aio_cancel(acbs[i]->aio_fildes, acbs[i]) == AIO_CANCELED)
						aio_return(acbs[i]);
					free(acbs[i]);
				}
				free(acbs);
				TASK_VAL(t) = 0;
			}
#endif
			break;
#endif	/* EVFILT_LIO */
#endif	/* AIO_SUPPORT */
#ifdef EVFILT_USER
		case taskUSER:
#ifndef KQ_DISABLE
#ifdef __NetBSD__
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_USER, EV_DELETE, 0, 0, (intptr_t) TASK_VAL(t));
#else
			EV_SET(&chg[0], TASK_VAL(t), EVFILT_USER, EV_DELETE, 0, 0, (void*) TASK_VAL(t));
#endif
#endif
			break;
#endif	/* EVFILT_USER */
		case taskTHREAD:
#ifdef HAVE_LIBPTHREAD
			pthread_cancel((pthread_t) TASK_VAL(t));
#endif
			return NULL;
#if defined(HAVE_TIMER_CREATE) && defined(HAVE_TIMER_SETTIME)
		case taskRTC:
			timer_delete((timer_t) TASK_FLAG(t));
			schedCancel((sched_task_t*) TASK_RET(t));
			return NULL;
#endif	/* HAVE_TIMER_CREATE */
		default:
			return NULL;
	}

#ifndef KQ_DISABLE
	kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout);
#endif
	return NULL;
}

#ifdef HAVE_LIBPTHREAD
/*
 * sched_hook_thread() - Default THREAD hook
 *
 * @task = current task
 * @arg = pthread attributes
 * return: <0 errors and 0 ok
 */
void *
sched_hook_thread(void *task, void *arg)
{
	sched_task_t *t = task;
	pthread_t tid;
	sigset_t s, o;

	if (!t || !TASK_ROOT(t))
		return (void*) -1;

	sigfillset(&s);
	pthread_sigmask(SIG_BLOCK, &s, &o);
	if ((errno = pthread_create(&tid, (pthread_attr_t*) arg, 
				(void *(*)(void*)) _sched_threadWrapper, t))) {
		LOGERR;
		pthread_sigmask(SIG_SETMASK, &o, NULL);
		return (void*) -1;
	} else
		TASK_VAL(t) = (u_long) tid;

	if (!TASK_ISLOCKED(t))
		TASK_LOCK(t);

	pthread_sigmask(SIG_SETMASK, &o, NULL);
	return NULL;
}
#endif

/*
 * sched_hook_read() - Default READ hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_read(void *task, void *arg __unused)
{
	sched_task_t *t = task;
#ifndef KQ_DISABLE
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };
#else
	sched_root_task_t *r = NULL;
#endif

	if (!t || !TASK_ROOT(t))
		return (void*) -1;
#ifdef KQ_DISABLE
	r = TASK_ROOT(t);
#endif

#ifndef KQ_DISABLE
#ifdef __NetBSD__
	EV_SET(&chg[0], TASK_FD(t), EVFILT_READ, EV_ADD | EV_CLEAR, 0, 0, (intptr_t) TASK_FD(t));
#else
	EV_SET(&chg[0], TASK_FD(t), EVFILT_READ, EV_ADD | EV_CLEAR, 0, 0, (void*) TASK_FD(t));
#endif
	if (kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}
#else
	FD_SET(TASK_FD(t), &r->root_fds[0]);
	if (TASK_FD(t) >= r->root_kq)
		r->root_kq = TASK_FD(t) + 1;
#endif

	return NULL;
}

/*
 * sched_hook_write() - Default WRITE hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_write(void *task, void *arg __unused)
{
	sched_task_t *t = task;
#ifndef KQ_DISABLE
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };
#else
	sched_root_task_t *r = NULL;
#endif

	if (!t || !TASK_ROOT(t))
		return (void*) -1;
#ifdef KQ_DISABLE
	r = TASK_ROOT(t);
#endif

#ifndef KQ_DISABLE
#ifdef __NetBSD__
	EV_SET(&chg[0], TASK_FD(t), EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, (intptr_t) TASK_FD(t));
#else
	EV_SET(&chg[0], TASK_FD(t), EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, (void*) TASK_FD(t));
#endif
	if (kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}
#else
	FD_SET(TASK_FD(t), &r->root_fds[1]);
	if (TASK_FD(t) >= r->root_kq)
		r->root_kq = TASK_FD(t) + 1;
#endif

	return NULL;
}

/*
 * sched_hook_alarm() - Default ALARM hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_alarm(void *task, void *arg __unused)
{
#ifndef KQ_DISABLE
	sched_task_t *t = task;
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };

	if (!t || !TASK_ROOT(t))
		return (void*) -1;

#ifdef __NetBSD__
	EV_SET(&chg[0], (uintptr_t) TASK_DATA(t), EVFILT_TIMER, EV_ADD | EV_CLEAR, 0, 
			t->task_val.ts.tv_sec * 1000 + t->task_val.ts.tv_nsec / 1000000, 
			(intptr_t) TASK_DATA(t));
#else
	EV_SET(&chg[0], (uintptr_t) TASK_DATA(t), EVFILT_TIMER, EV_ADD | EV_CLEAR, 0, 
			t->task_val.ts.tv_sec * 1000 + t->task_val.ts.tv_nsec / 1000000, 
			(void*) TASK_DATA(t));
#endif
	if (kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}

#endif
	return NULL;
}

/*
 * sched_hook_node() - Default NODE hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_node(void *task, void *arg __unused)
{
#ifndef KQ_DISABLE
	sched_task_t *t = task;
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };

	if (!t || !TASK_ROOT(t))
		return (void*) -1;

#ifdef __NetBSD__
	EV_SET(&chg[0], TASK_FD(t), EVFILT_VNODE, EV_ADD | EV_CLEAR, 
			NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB | 
			NOTE_LINK | NOTE_RENAME | NOTE_REVOKE, 0, (intptr_t) TASK_FD(t));
#else
	EV_SET(&chg[0], TASK_FD(t), EVFILT_VNODE, EV_ADD | EV_CLEAR, 
			NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB | 
			NOTE_LINK | NOTE_RENAME | NOTE_REVOKE, 0, (void*) TASK_FD(t));
#endif
	if (kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}

#endif
	return NULL;
}

/*
 * sched_hook_proc() - Default PROC hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_proc(void *task, void *arg __unused)
{
#ifndef KQ_DISABLE
	sched_task_t *t = task;
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };

	if (!t || !TASK_ROOT(t))
		return (void*) -1;

#ifdef __NetBSD__
	EV_SET(&chg[0], TASK_VAL(t), EVFILT_PROC, EV_ADD | EV_CLEAR, 
			NOTE_EXIT | NOTE_FORK | NOTE_EXEC | NOTE_TRACK, 0, (intptr_t) TASK_VAL(t));
#else
	EV_SET(&chg[0], TASK_VAL(t), EVFILT_PROC, EV_ADD | EV_CLEAR, 
			NOTE_EXIT | NOTE_FORK | NOTE_EXEC | NOTE_TRACK, 0, (void*) TASK_VAL(t));
#endif
	if (kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}

#endif
	return NULL;
}

/*
 * sched_hook_signal() - Default SIGNAL hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
void *
sched_hook_signal(void *task, void *arg __unused)
{
#ifndef KQ_DISABLE
	sched_task_t *t = task;
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };

	if (!t || !TASK_ROOT(t))
		return (void*) -1;

	/* ignore signal */
	signal(TASK_VAL(t), SIG_IGN);

#ifdef __NetBSD__
	EV_SET(&chg[0], TASK_VAL(t), EVFILT_SIGNAL, EV_ADD | EV_CLEAR, 0, 0, (intptr_t) TASK_VAL(t));
#else
	EV_SET(&chg[0], TASK_VAL(t), EVFILT_SIGNAL, EV_ADD | EV_CLEAR, 0, 0, (void*) TASK_VAL(t));
#endif
	if (kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}
#else
#if 0
	sched_task_t *t = task;
	struct sigaction sa;

	memset(&sa, 0, sizeof sa);
	sigemptyset(&sa.sa_mask);
	sa.sa_handler = _sched_sigHandler;
	sa.sa_flags = SA_RESETHAND | SA_RESTART;

	if (sigaction(TASK_VAL(t), &sa, NULL) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}
#endif	/* 0 */
#endif
	return NULL;
}

/*
 * sched_hook_user() - Default USER hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
#ifdef EVFILT_USER
void *
sched_hook_user(void *task, void *arg __unused)
{
#ifndef KQ_DISABLE
	sched_task_t *t = task;
	struct kevent chg[1];
	struct timespec timeout = { 0, 0 };

	if (!t || !TASK_ROOT(t))
		return (void*) -1;

#ifdef __NetBSD__
	EV_SET(&chg[0], TASK_VAL(t), EVFILT_USER, EV_ADD | EV_CLEAR, TASK_DATLEN(t), 
			0, (intptr_t) TASK_VAL(t));
#else
	EV_SET(&chg[0], TASK_VAL(t), EVFILT_USER, EV_ADD | EV_CLEAR, TASK_DATLEN(t), 
			0, (void*) TASK_VAL(t));
#endif
	if (kevent(TASK_ROOT(t)->root_kq, chg, 1, NULL, 0, &timeout) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	}

#endif
	return NULL;
}
#endif

/*
 * sched_hook_fetch() - Default FETCH hook
 *
 * @root = root task
 * @arg = unused
 * return: NULL error or !=NULL fetched task
 */
void *
sched_hook_fetch(void *root, void *arg __unused)
{
	sched_root_task_t *r = root;
	sched_task_t *task, *tmp;
	struct timespec now, m, mtmp;
#ifndef KQ_DISABLE
	struct kevent evt[1], res[KQ_EVENTS];
	struct timespec *timeout;
#else
	struct timeval *timeout, tv;
	fd_set rfd, wfd, xfd;
#endif
	register int i, flg;
	int en;
#ifdef AIO_SUPPORT
	int len, fd;
	struct aiocb *acb;
#ifdef EVFILT_LIO
	int l;
	register int j;
	off_t off;
	struct aiocb **acbs;
	struct iovec *iv;
#endif	/* EVFILT_LIO */
#endif	/* AIO_SUPPORT */

	if (!r)
		return NULL;

	/* get new task by queue priority */
	while ((task = TAILQ_FIRST(&r->root_event))) {
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_lock(&r->root_mtx[taskEVENT]);
#endif
		TAILQ_REMOVE(&r->root_event, task, task_node);
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_unlock(&r->root_mtx[taskEVENT]);
#endif
		task->task_type = taskUNUSE;
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_lock(&r->root_mtx[taskUNUSE]);
#endif
		TAILQ_INSERT_TAIL(&r->root_unuse, task, task_node);
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_unlock(&r->root_mtx[taskUNUSE]);
#endif
		return task;
	}
	while ((task = TAILQ_FIRST(&r->root_ready))) {
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
		TAILQ_REMOVE(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
		task->task_type = taskUNUSE;
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_lock(&r->root_mtx[taskUNUSE]);
#endif
		TAILQ_INSERT_TAIL(&r->root_unuse, task, task_node);
#ifdef HAVE_LIBPTHREAD
		pthread_mutex_unlock(&r->root_mtx[taskUNUSE]);
#endif
		return task;
	}

#ifdef TIMER_WITHOUT_SORT
	clock_gettime(CLOCK_MONOTONIC, &now);

	sched_timespecclear(&r->root_wait);
	TAILQ_FOREACH(task, &r->root_timer, task_node) {
		if (!sched_timespecisset(&r->root_wait))
			r->root_wait = TASK_TS(task);
		else if (sched_timespeccmp(&TASK_TS(task), &r->root_wait, -) < 0)
			r->root_wait = TASK_TS(task);
	}

	if (TAILQ_FIRST(&r->root_timer)) {
		m = r->root_wait;
		sched_timespecsub(&m, &now, &mtmp);
		r->root_wait = mtmp;
	} else {
		/* set wait INFTIM */
		sched_timespecinf(&r->root_wait);
	}
#else	/* ! TIMER_WITHOUT_SORT */
	if (!TAILQ_FIRST(&r->root_task) && (task = TAILQ_FIRST(&r->root_timer))) {
		clock_gettime(CLOCK_MONOTONIC, &now);

		m = TASK_TS(task);
		sched_timespecsub(&m, &now, &mtmp);
		r->root_wait = mtmp;
	} else {
		/* set wait INFTIM */
		sched_timespecinf(&r->root_wait);
	}
#endif	/* TIMER_WITHOUT_SORT */
	/* if present member of task, set NOWAIT */
	if (TAILQ_FIRST(&r->root_task))
		sched_timespecclear(&r->root_wait);

	if (r->root_wait.tv_sec != -1 && r->root_wait.tv_nsec != -1) {
#ifndef KQ_DISABLE
		timeout = &r->root_wait;
#else
		sched_timespec2val(&r->root_wait, &tv);
		timeout = &tv;
#endif	/* KQ_DISABLE */
	} else if (sched_timespecisinf(&r->root_poll))
		timeout = NULL;
	else {
#ifndef KQ_DISABLE
		timeout = &r->root_poll;
#else
		sched_timespec2val(&r->root_poll, &tv);
		timeout = &tv;
#endif	/* KQ_DISABLE */
	}

#ifndef KQ_DISABLE
	if ((en = kevent(r->root_kq, NULL, 0, res, KQ_EVENTS, timeout)) == -1) {
#else
	rfd = xfd = r->root_fds[0];
	wfd = r->root_fds[1];
	if ((en = select(r->root_kq, &rfd, &wfd, &xfd, timeout)) == -1) {
#endif	/* KQ_DISABLE */
		if (r->root_hooks.hook_exec.exception) {
			if (r->root_hooks.hook_exec.exception(r, NULL))
				return NULL;
		} else if (errno != EINTR)
			LOGERR;
		goto skip_event;
	}

	/* kevent dispatcher */
	now.tv_sec = now.tv_nsec = 0;
	/* Go and catch the cat into pipes ... */
#ifndef KQ_DISABLE
	for (i = 0; i < en; i++) {
		memcpy(evt, &res[i], sizeof evt);
		evt->flags = EV_DELETE;
		/* Put read/write task to ready queue */
		switch (res[i].filter) {
			case EVFILT_READ:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_read, task_node, tmp) {
					if (TASK_FD(task) != ((intptr_t) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove read handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREAD]);
#endif
					TAILQ_REMOVE(&r->root_read, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREAD]);
#endif
					if (r->root_hooks.hook_exec.exception && res[i].flags & EV_EOF) {
 						if (r->root_hooks.hook_exec.exception(r, (void*) EV_EOF)) {
							task->task_type = taskUNUSE;
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_lock(&r->root_mtx[taskUNUSE]);
#endif
							TAILQ_INSERT_TAIL(&r->root_unuse, task, task_node);
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_unlock(&r->root_mtx[taskUNUSE]);
#endif
						} else {
							task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
							TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
						}
					} else {
						task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
						TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
					}
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
			case EVFILT_WRITE:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_write, task_node, tmp) {
					if (TASK_FD(task) != ((intptr_t) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove write handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskWRITE]);
#endif
					TAILQ_REMOVE(&r->root_write, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskWRITE]);
#endif
					if (r->root_hooks.hook_exec.exception && res[i].flags & EV_EOF) {
 						if (r->root_hooks.hook_exec.exception(r, (void*) EV_EOF)) {
							task->task_type = taskUNUSE;
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_lock(&r->root_mtx[taskUNUSE]);
#endif
							TAILQ_INSERT_TAIL(&r->root_unuse, task, task_node);
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_unlock(&r->root_mtx[taskUNUSE]);
#endif
						} else {
							task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
							TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
							pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
						}
					} else {
						task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
						TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
					}
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
			case EVFILT_TIMER:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_alarm, task_node, tmp) {
					if ((uintptr_t) TASK_DATA(task) != ((uintptr_t) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove alarm handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskALARM]);
#endif
					TAILQ_REMOVE(&r->root_alarm, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskALARM]);
#endif
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
			case EVFILT_VNODE:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_node, task_node, tmp) {
					if (TASK_FD(task) != ((intptr_t) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove node handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskNODE]);
#endif
					TAILQ_REMOVE(&r->root_node, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskNODE]);
#endif
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
			case EVFILT_PROC:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_proc, task_node, tmp) {
					if (TASK_VAL(task) != ((uintptr_t) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove proc handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskPROC]);
#endif
					TAILQ_REMOVE(&r->root_proc, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskPROC]);
#endif
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
			case EVFILT_SIGNAL:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_signal, task_node, tmp) {
					if (TASK_VAL(task) != ((uintptr_t) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove signal handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskSIGNAL]);
#endif
					TAILQ_REMOVE(&r->root_signal, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskSIGNAL]);
#endif
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
#ifdef AIO_SUPPORT
			case EVFILT_AIO:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_aio, task_node, tmp) {
					acb = (struct aiocb*) TASK_VAL(task);
					if (acb != ((struct aiocb*) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove user handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskAIO]);
#endif
					TAILQ_REMOVE(&r->root_aio, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskAIO]);
#endif
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
					fd = acb->aio_fildes;
					if ((len = aio_return(acb)) != -1) {
						if (lseek(fd, acb->aio_offset + len, SEEK_CUR) == -1)
							LOGERR;
					} else
						LOGERR;
					free(acb);
					TASK_DATLEN(task) = (u_long) len;
					TASK_FD(task) = fd;
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
#ifdef EVFILT_LIO
			case EVFILT_LIO:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_lio, task_node, tmp) {
					acbs = (struct aiocb**) TASK_VAL(task);
					if (acbs != ((struct aiocb**) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove user handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskLIO]);
#endif
					TAILQ_REMOVE(&r->root_lio, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskLIO]);
#endif
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
					iv = (struct iovec*) TASK_DATA(task);
					fd = acbs[0]->aio_fildes;
					off = acbs[0]->aio_offset;
					for (j = len = 0; i < TASK_DATLEN(task); len += l, i++) {
						if ((iv[i].iov_len = aio_return(acbs[i])) == -1)
							l = 0;
						else
							l = iv[i].iov_len;
						free(acbs[i]);
					}
					free(acbs);
					TASK_DATLEN(task) = (u_long) len;
					TASK_FD(task) = fd;

					if (lseek(fd, off + len, SEEK_CUR) == -1)
						LOGERR;
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
#endif	/* EVFILT_LIO */
#endif	/* AIO_SUPPORT */
#ifdef EVFILT_USER
			case EVFILT_USER:
				flg = 0;
				TAILQ_FOREACH_SAFE(task, &r->root_user, task_node, tmp) {
					if (TASK_VAL(task) != ((uintptr_t) res[i].udata))
						continue;
					else {
						flg++;
						TASK_RET(task) = res[i].data;
						TASK_FLAG(task) = (u_long) res[i].fflags;
					}
					/* remove user handle */
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskUSER]);
#endif
					TAILQ_REMOVE(&r->root_user, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskUSER]);
#endif
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
				}
				/* if match at least 2, don't remove resouce of event */
				if (flg > 1)
					evt->flags ^= evt->flags;
				break;
#endif	/* EVFILT_USER */
		}
		if (kevent(r->root_kq, evt, 1, NULL, 0, &now) == -1) {
			if (r->root_hooks.hook_exec.exception) {
				if (r->root_hooks.hook_exec.exception(r, NULL))
					return NULL;
			} else
				LOGERR;
		}
	}
#else	/* end of kevent dispatcher */
	for (i = 0; i < r->root_kq; i++) {
		if (FD_ISSET(i, &rfd) || FD_ISSET(i, &xfd)) {
			flg = 0;
			TAILQ_FOREACH_SAFE(task, &r->root_read, task_node, tmp) {
				if (TASK_FD(task) != i)
					continue;
				else {
					flg++;
					TASK_FLAG(task) = ioctl(TASK_FD(task), 
							FIONREAD, &TASK_RET(task));
				}
				/* remove read handle */
#ifdef HAVE_LIBPTHREAD
				pthread_mutex_lock(&r->root_mtx[taskREAD]);
#endif
				TAILQ_REMOVE(&r->root_read, task, task_node);
#ifdef HAVE_LIBPTHREAD
				pthread_mutex_unlock(&r->root_mtx[taskREAD]);
#endif
				if (r->root_hooks.hook_exec.exception) {
 					if (r->root_hooks.hook_exec.exception(r, NULL)) {
						task->task_type = taskUNUSE;
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_lock(&r->root_mtx[taskUNUSE]);
#endif
						TAILQ_INSERT_TAIL(&r->root_unuse, task, task_node);
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_unlock(&r->root_mtx[taskUNUSE]);
#endif
					} else {
						task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
						TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
					}
				} else {
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
				}
			}
			/* if match equal to 1, remove resouce */
			if (flg == 1)
				FD_CLR(i, &r->root_fds[0]);
		}

		if (FD_ISSET(i, &wfd)) {
			flg = 0;
			TAILQ_FOREACH_SAFE(task, &r->root_write, task_node, tmp) {
				if (TASK_FD(task) != i)
					continue;
				else {
					flg++;
					TASK_FLAG(task) = ioctl(TASK_FD(task), 
							FIONWRITE, &TASK_RET(task));
				}
				/* remove write handle */
#ifdef HAVE_LIBPTHREAD
				pthread_mutex_lock(&r->root_mtx[taskWRITE]);
#endif
				TAILQ_REMOVE(&r->root_write, task, task_node);
#ifdef HAVE_LIBPTHREAD
				pthread_mutex_unlock(&r->root_mtx[taskWRITE]);
#endif
				if (r->root_hooks.hook_exec.exception) {
 					if (r->root_hooks.hook_exec.exception(r, NULL)) {
						task->task_type = taskUNUSE;
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_lock(&r->root_mtx[taskUNUSE]);
#endif
						TAILQ_INSERT_TAIL(&r->root_unuse, task, task_node);
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_unlock(&r->root_mtx[taskUNUSE]);
#endif
					} else {
						task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
						TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
						pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
					}
				} else {
					task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
					TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
					pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
				}
			}
			/* if match equal to 1, remove resouce */
			if (flg == 1)
				FD_CLR(i, &r->root_fds[1]);
		}
	}

	/* optimize select */
	for (i = r->root_kq - 1; i > 2; i--)
		if (FD_ISSET(i, &r->root_fds[0]) || FD_ISSET(i, &r->root_fds[1]))
			break;
	if (i > 2)
		r->root_kq = i + 1;
#endif	/* KQ_DISABLE */

skip_event:
	/* timer update & put in ready queue */
	clock_gettime(CLOCK_MONOTONIC, &now);

	TAILQ_FOREACH_SAFE(task, &r->root_timer, task_node, tmp)
		if (sched_timespeccmp(&now, &TASK_TS(task), -) >= 0) {
#ifdef HAVE_LIBPTHREAD
			pthread_mutex_lock(&r->root_mtx[taskTIMER]);
#endif
			TAILQ_REMOVE(&r->root_timer, task, task_node);
#ifdef HAVE_LIBPTHREAD
			pthread_mutex_unlock(&r->root_mtx[taskTIMER]);
#endif
			task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
			pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
			TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
			pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
		}

	/* put regular task priority task to ready queue, 
		if there is no ready task or reach max missing hit for regular task */
	if ((task = TAILQ_FIRST(&r->root_task))) {
		if (!TAILQ_FIRST(&r->root_ready) || r->root_miss >= TASK_VAL(task)) {
			r->root_miss ^= r->root_miss;

#ifdef HAVE_LIBPTHREAD
			pthread_mutex_lock(&r->root_mtx[taskTASK]);
#endif
			TAILQ_REMOVE(&r->root_task, task, task_node);
#ifdef HAVE_LIBPTHREAD
			pthread_mutex_unlock(&r->root_mtx[taskTASK]);
#endif
			task->task_type = taskREADY;
#ifdef HAVE_LIBPTHREAD
			pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
			TAILQ_INSERT_TAIL(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
			pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
		} else
			r->root_miss++;
	} else
		r->root_miss ^= r->root_miss;

	/* OK, lets get ready task !!! */
	task = TAILQ_FIRST(&r->root_ready);
	if (!(task))
		return NULL;

#ifdef HAVE_LIBPTHREAD
	pthread_mutex_lock(&r->root_mtx[taskREADY]);
#endif
	TAILQ_REMOVE(&r->root_ready, task, task_node);
#ifdef HAVE_LIBPTHREAD
	pthread_mutex_unlock(&r->root_mtx[taskREADY]);
#endif
	task->task_type = taskUNUSE;
#ifdef HAVE_LIBPTHREAD
	pthread_mutex_lock(&r->root_mtx[taskUNUSE]);
#endif
	TAILQ_INSERT_TAIL(&r->root_unuse, task, task_node);
#ifdef HAVE_LIBPTHREAD
	pthread_mutex_unlock(&r->root_mtx[taskUNUSE]);
#endif
	return task;
}

/*
 * sched_hook_exception() - Default EXCEPTION hook
 *
 * @root = root task
 * @arg = custom handling: if arg == EV_EOF or other value; default: arg == NULL log errno
 * return: <0 errors and 0 ok
 */
void *
sched_hook_exception(void *root, void *arg)
{
	sched_root_task_t *r = root;

	if (!r)
		return NULL;

	/* custom exception handling ... */
	if (arg) {
		if (arg == (void*) EV_EOF)
			return NULL;
		return (void*) -1;	/* raise scheduler error!!! */
	}

	/* if error hook exists */
	if (r->root_hooks.hook_root.error)
		return (r->root_hooks.hook_root.error(root, (void*) ((intptr_t) errno)));

	/* default case! */
	LOGERR;
	return NULL;
}

/*
 * sched_hook_condition() - Default CONDITION hook
 *
 * @root = root task
 * @arg = killState from schedRun()
 * return: NULL kill scheduler loop or !=NULL ok
 */
void *
sched_hook_condition(void *root, void *arg)
{
	sched_root_task_t *r = root;

	if (!r)
		return NULL;

	return (void*) (r->root_cond - *(intptr_t*) arg);
}

/*
 * sched_hook_rtc() - Default RTC hook
 *
 * @task = current task
 * @arg = unused
 * return: <0 errors and 0 ok
 */
#if defined(HAVE_TIMER_CREATE) && defined(HAVE_TIMER_SETTIME)
void *
sched_hook_rtc(void *task, void *arg __unused)
{
	sched_task_t *sigt = NULL, *t = task;
	struct itimerspec its;
	struct sigevent evt;
	timer_t tmr;

	if (!t || !TASK_ROOT(t))
		return (void*) -1;

	memset(&evt, 0, sizeof evt);
	evt.sigev_notify = SIGEV_SIGNAL;
	evt.sigev_signo = (intptr_t) TASK_DATA(t) + SIGRTMIN;
	evt.sigev_value.sival_ptr = TASK_DATA(t);

	if (timer_create(CLOCK_MONOTONIC, &evt, &tmr) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		return (void*) -1;
	} else
		TASK_FLAG(t) = (u_long) tmr;

	if (!(sigt = schedSignal(TASK_ROOT(t), _sched_rtcWrapper, TASK_ARG(t), evt.sigev_signo, 
				t, (size_t) tmr))) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		timer_delete(tmr);
		return (void*) -1;
	} else
		TASK_RET(t) = (uintptr_t) sigt;

	memset(&its, 0, sizeof its);
	its.it_value.tv_sec = t->task_val.ts.tv_sec;
	its.it_value.tv_nsec = t->task_val.ts.tv_nsec;

	if (timer_settime(tmr, TIMER_RELTIME, &its, NULL) == -1) {
		if (TASK_ROOT(t)->root_hooks.hook_exec.exception)
			TASK_ROOT(t)->root_hooks.hook_exec.exception(TASK_ROOT(t), NULL);
		else
			LOGERR;
		schedCancel(sigt);
		timer_delete(tmr);
		return (void*) -1;
	}

	return NULL;
}
#endif	/* HAVE_TIMER_CREATE */