[apple/xnu.git] / bsd / kern / kern_synch.c

/*
 * Copyright (c) 2000-2016 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1987 Carnegie-Mellon University
 * All rights reserved.  The CMU software License Agreement specifies
 * the terms and conditions for use and redistribution.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc_internal.h>
#include <sys/user.h>
#include <sys/file_internal.h>
#include <sys/vnode.h>
#include <sys/kernel.h>

#include <kern/queue.h>
#include <sys/lock.h>
#include <kern/thread.h>
#include <kern/sched_prim.h>
#include <kern/ast.h>

#include <kern/cpu_number.h>
#include <vm/vm_kern.h>

#include <kern/task.h>
#include <mach/time_value.h>
#include <kern/locks.h>
#include <kern/policy_internal.h>

#include <sys/systm.h>			/* for unix_syscall_return() */
#include <libkern/OSAtomic.h>

extern void compute_averunnable(void *);	/* XXX */

__attribute__((noreturn))
static void
_sleep_continue( __unused void *parameter, wait_result_t wresult)
{
	struct proc *p = current_proc();
	thread_t self  = current_thread();
	struct uthread * ut;
	int sig, catch;
	int error = 0;
	int dropmutex, spinmutex;

	ut = get_bsdthread_info(self);
	catch     = ut->uu_pri & PCATCH;
	dropmutex = ut->uu_pri & PDROP;
	spinmutex = ut->uu_pri & PSPIN;

	switch (wresult) {
		case THREAD_TIMED_OUT:
			error = EWOULDBLOCK;
			break;
		case THREAD_AWAKENED:
			/*
			 * Posix implies any signal should be delivered
			 * first, regardless of whether awakened due
			 * to receiving event.
			 */
			if (!catch)
				break;
			/* else fall through */
		case THREAD_INTERRUPTED:
			if (catch) {
				if (thread_should_abort(self)) {
					error = EINTR;
				} else if (SHOULDissignal(p,ut)) {
					if ((sig = CURSIG(p)) != 0) {
						if (p->p_sigacts->ps_sigintr & sigmask(sig))
							error = EINTR;
						else
							error = ERESTART;
					}
					if (thread_should_abort(self)) {
						error = EINTR;
					}
				} else if( (ut->uu_flag & ( UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
                                        /* due to thread cancel */
                                        error = EINTR;
                                }
			}  else
				error = EINTR;
			break;
	}

	if (error == EINTR || error == ERESTART)
		act_set_astbsd(self);

	if (ut->uu_mtx && !dropmutex) {
		if (spinmutex)
			lck_mtx_lock_spin(ut->uu_mtx);
		else
			lck_mtx_lock(ut->uu_mtx);
	}
	ut->uu_wchan = NULL;
	ut->uu_wmesg = NULL;

	unix_syscall_return((*ut->uu_continuation)(error));
}

/*
 * Give up the processor till a wakeup occurs
 * on chan, at which time the process
 * enters the scheduling queue at priority pri.
 * The most important effect of pri is that when
 * pri<=PZERO a signal cannot disturb the sleep;
 * if pri>PZERO signals will be processed.
 * If pri&PCATCH is set, signals will cause sleep
 * to return 1, rather than longjmp.
 * Callers of this routine must be prepared for
 * premature return, and check that the reason for
 * sleeping has gone away.
 *
 * if msleep was the entry point, than we have a mutex to deal with
 *
 * The mutex is unlocked before the caller is blocked, and
 * relocked before msleep returns unless the priority includes the PDROP
 * flag... if PDROP is specified, _sleep returns with the mutex unlocked
 * regardless of whether it actually blocked or not.
 */

static int
_sleep(
	caddr_t		chan,
	int		pri,
	const char	*wmsg,
	u_int64_t	abstime,
	int		(*continuation)(int),
        lck_mtx_t	*mtx)
{
	struct proc *p;
	thread_t self = current_thread();
	struct uthread * ut;
	int sig, catch;
	int dropmutex  = pri & PDROP;
	int spinmutex  = pri & PSPIN;
	int wait_result;
	int error = 0;

	ut = get_bsdthread_info(self);

	p = current_proc();
	p->p_priority = pri & PRIMASK;
	/* It can still block in proc_exit() after the teardown. */
	if (p->p_stats != NULL)
		OSIncrementAtomicLong(&p->p_stats->p_ru.ru_nvcsw);
	
	if (pri & PCATCH)
		catch = THREAD_ABORTSAFE;
	else
		catch = THREAD_UNINT;

	/* set wait message & channel */
	ut->uu_wchan = chan;
	ut->uu_wmesg = wmsg ? wmsg : "unknown";

	if (mtx != NULL && chan != NULL && (thread_continue_t)continuation == THREAD_CONTINUE_NULL) {
		int	flags;

		if (dropmutex)
			flags = LCK_SLEEP_UNLOCK;
		else
			flags = LCK_SLEEP_DEFAULT;

		if (spinmutex)
			flags |= LCK_SLEEP_SPIN;

		if (abstime)
			wait_result = lck_mtx_sleep_deadline(mtx, flags, chan, catch, abstime);
		else
			wait_result = lck_mtx_sleep(mtx, flags, chan, catch);
	}
	else {
		if (chan != NULL)
			assert_wait_deadline(chan, catch, abstime);
		if (mtx)
			lck_mtx_unlock(mtx);

		if (catch == THREAD_ABORTSAFE) {
			if (SHOULDissignal(p,ut)) {
				if ((sig = CURSIG(p)) != 0) {
					if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE)
						goto block;
					if (p->p_sigacts->ps_sigintr & sigmask(sig))
						error = EINTR;
					else
						error = ERESTART;
					if (mtx && !dropmutex) {
						if (spinmutex)
							lck_mtx_lock_spin(mtx);
						else
							lck_mtx_lock(mtx);
					}
					goto out;
				}
			}
			if (thread_should_abort(self)) {
				if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE)
					goto block;
				error = EINTR;

				if (mtx && !dropmutex) {
					if (spinmutex)
						lck_mtx_lock_spin(mtx);
					else
						lck_mtx_lock(mtx);
				}
				goto out;
			}
		}		


block:
		if ((thread_continue_t)continuation != THREAD_CONTINUE_NULL) {
		        ut->uu_continuation = continuation;
			ut->uu_pri  = pri;
			ut->uu_timo = abstime? 1: 0;
			ut->uu_mtx  = mtx;
			(void) thread_block(_sleep_continue);
			/* NOTREACHED */
		}
		
		wait_result = thread_block(THREAD_CONTINUE_NULL);

		if (mtx && !dropmutex) {
			if (spinmutex)
				lck_mtx_lock_spin(mtx);
			else
				lck_mtx_lock(mtx);
		}
	}

	switch (wait_result) {
		case THREAD_TIMED_OUT:
			error = EWOULDBLOCK;
			break;
		case THREAD_AWAKENED:
		case THREAD_RESTART:
			/*
			 * Posix implies any signal should be delivered
			 * first, regardless of whether awakened due
			 * to receiving event.
			 */
			if (catch != THREAD_ABORTSAFE)
				break;
			/* else fall through */
		case THREAD_INTERRUPTED:
			if (catch == THREAD_ABORTSAFE) {
				if (thread_should_abort(self)) {
					error = EINTR;
				} else if (SHOULDissignal(p, ut)) {
					if ((sig = CURSIG(p)) != 0) {
						if (p->p_sigacts->ps_sigintr & sigmask(sig))
							error = EINTR;
						else
							error = ERESTART;
					}
					if (thread_should_abort(self)) {
						error = EINTR;
					}
				} else if( (ut->uu_flag & ( UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
                                        /* due to thread cancel */
                                        error = EINTR;
                                }
			}  else
				error = EINTR;
			break;
	}
out:
	if (error == EINTR || error == ERESTART)
		act_set_astbsd(self);
	ut->uu_wchan = NULL;
	ut->uu_wmesg = NULL;

	return (error);
}

int
sleep(
	void	*chan,
	int		pri)
{
	return _sleep((caddr_t)chan, pri, (char *)NULL, 0, (int (*)(int))0, (lck_mtx_t *)0);
}

int
msleep0(
	void		*chan,
	lck_mtx_t	*mtx,
	int		pri,
	const char	*wmsg,
	int		timo,
	int		(*continuation)(int))
{
	u_int64_t	abstime = 0;

	if (timo)
		clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);

	return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, mtx);
}

int
msleep(
	void		*chan,
	lck_mtx_t	*mtx,
	int		pri,
	const char	*wmsg,
	struct timespec		*ts)
{
	u_int64_t	abstime = 0;

	if (ts && (ts->tv_sec || ts->tv_nsec)) {
		nanoseconds_to_absolutetime((uint64_t)ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec,  &abstime );
		clock_absolutetime_interval_to_deadline( abstime, &abstime );
	}

	return _sleep((caddr_t)chan, pri, wmsg, abstime, (int (*)(int))0, mtx);
}

int
msleep1(
	void		*chan,
	lck_mtx_t	*mtx,
	int		pri,
	const char	*wmsg,
	u_int64_t	abstime)
{
	return _sleep((caddr_t)chan, pri, wmsg, abstime, (int (*)(int))0, mtx);
}

int
tsleep(
	void		*chan,
	int		pri,
	const char	*wmsg,
	int		timo)
{
	u_int64_t	abstime = 0;

	if (timo)
		clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
	return _sleep((caddr_t)chan, pri, wmsg, abstime, (int (*)(int))0, (lck_mtx_t *)0);
}

int
tsleep0(
	void		*chan,
	int		pri,
	const char	*wmsg,
	int		timo,
	int		(*continuation)(int))
{			
	u_int64_t	abstime = 0;

	if (timo)
		clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
	return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, (lck_mtx_t *)0);
}

int
tsleep1(
	void		*chan,
	int		pri,
	const char	*wmsg,
	u_int64_t	abstime,
	int		(*continuation)(int))
{			
	return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, (lck_mtx_t *)0);
}

/*
 * Wake up all processes sleeping on chan.
 */
void
wakeup(void *chan)
{
	thread_wakeup((caddr_t)chan);
}

/*
 * Wake up the first process sleeping on chan.
 *
 * Be very sure that the first process is really
 * the right one to wakeup.
 */
void
wakeup_one(caddr_t chan)
{
	thread_wakeup_one((caddr_t)chan);
}

/*
 * Compute the priority of a process when running in user mode.
 * Arrange to reschedule if the resulting priority is better
 * than that of the current process.
 */
void
resetpriority(struct proc *p)
{
	(void)task_importance(p->task, -p->p_nice);
}

struct loadavg averunnable =
	{ {0, 0, 0}, FSCALE };		/* load average, of runnable procs */
/*
 * Constants for averages over 1, 5, and 15 minutes
 * when sampling at 5 second intervals.
 */
static fixpt_t cexp[3] = {
    (fixpt_t)(0.9200444146293232 * FSCALE),    /* exp(-1/12) */
    (fixpt_t)(0.9834714538216174 * FSCALE),    /* exp(-1/60) */
    (fixpt_t)(0.9944598480048967 * FSCALE),    /* exp(-1/180) */
};

void
compute_averunnable(void *arg)
{
	unsigned int		nrun = *(unsigned int *)arg;
	struct loadavg		*avg = &averunnable;
	int		i;

    for (i = 0; i < 3; i++)
        avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
            nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
}
Commit	Line	Data
1c79356b	1	/*
39037602	2	* Copyright (c) 2000-2016 Apple Computer, Inc. All rights reserved.
1c79356b	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* Mach Operating System
	30	* Copyright (c) 1987 Carnegie-Mellon University
	31	* All rights reserved. The CMU software License Agreement specifies
	32	* the terms and conditions for use and redistribution.
	33	*/
	34
	35	#include <sys/param.h>
	36	#include <sys/systm.h>
91447636	37	#include <sys/proc_internal.h>
1c79356b	38	#include <sys/user.h>
91447636	39	#include <sys/file_internal.h>
1c79356b A	40	#include <sys/vnode.h>
1c79356b A	41	#include <sys/kernel.h>
1c79356b	42
1c79356b A	43	#include <kern/queue.h>
	44	#include <sys/lock.h>
	45	#include <kern/thread.h>
9bccf70c	46	#include <kern/sched_prim.h>
1c79356b A	47	#include <kern/ast.h>
	48
	49	#include <kern/cpu_number.h>
	50	#include <vm/vm_kern.h>
	51
	52	#include <kern/task.h>
	53	#include <mach/time_value.h>
fe8ab488	54	#include <kern/locks.h>
39037602	55	#include <kern/policy_internal.h>
91447636	56
2d21ac55 A	57	#include <sys/systm.h> /* for unix_syscall_return() */
	58	#include <libkern/OSAtomic.h>
	59
2d21ac55 A	60	extern void compute_averunnable(void ); / XXX */
2d21ac55 A	61
39037602	62	__attribute__((noreturn))
9bccf70c	63	static void
2d21ac55	64	_sleep_continue( __unused void *parameter, wait_result_t wresult)
1c79356b	65	{
2d21ac55 A	66	struct proc *p = current_proc();
2d21ac55 A	67	thread_t self = current_thread();
1c79356b A	68	struct uthread * ut;
	69	int sig, catch;
	70	int error = 0;
b0d623f7	71	int dropmutex, spinmutex;
1c79356b	72
55e303ae	73	ut = get_bsdthread_info(self);
91447636 A	74	catch = ut->uu_pri & PCATCH;
91447636 A	75	dropmutex = ut->uu_pri & PDROP;
b0d623f7	76	spinmutex = ut->uu_pri & PSPIN;
1c79356b	77
91447636	78	switch (wresult) {
1c79356b A	79	case THREAD_TIMED_OUT:
	80	error = EWOULDBLOCK;
	81	break;
	82	case THREAD_AWAKENED:
	83	/*
	84	* Posix implies any signal should be delivered
	85	* first, regardless of whether awakened due
	86	* to receiving event.
	87	*/
	88	if (!catch)
	89	break;
	90	/* else fall through */
	91	case THREAD_INTERRUPTED:
	92	if (catch) {
55e303ae	93	if (thread_should_abort(self)) {
1c79356b A	94	error = EINTR;
1c79356b A	95	} else if (SHOULDissignal(p,ut)) {
2d21ac55	96	if ((sig = CURSIG(p)) != 0) {
1c79356b A	97	if (p->p_sigacts->ps_sigintr & sigmask(sig))
	98	error = EINTR;
	99	else
	100	error = ERESTART;
	101	}
55e303ae	102	if (thread_should_abort(self)) {
1c79356b A	103	error = EINTR;
1c79356b A	104	}
91447636 A	105	} else if( (ut->uu_flag & ( UT_CANCELDISABLE \| UT_CANCEL \| UT_CANCELED)) == UT_CANCEL) {
	106	/* due to thread cancel */
	107	error = EINTR;
	108	}
1c79356b A	109	} else
	110	error = EINTR;
	111	break;
	112	}
	113
9bccf70c	114	if (error == EINTR \|\| error == ERESTART)
55e303ae	115	act_set_astbsd(self);
9bccf70c	116
b0d623f7 A	117	if (ut->uu_mtx && !dropmutex) {
	118	if (spinmutex)
	119	lck_mtx_lock_spin(ut->uu_mtx);
	120	else
	121	lck_mtx_lock(ut->uu_mtx);
	122	}
2d21ac55 A	123	ut->uu_wchan = NULL;
	124	ut->uu_wmesg = NULL;
	125
1c79356b A	126	unix_syscall_return((*ut->uu_continuation)(error));
	127	}
	128
	129	/*
	130	* Give up the processor till a wakeup occurs
	131	* on chan, at which time the process
	132	* enters the scheduling queue at priority pri.
	133	* The most important effect of pri is that when
	134	* pri<=PZERO a signal cannot disturb the sleep;
	135	* if pri>PZERO signals will be processed.
	136	* If pri&PCATCH is set, signals will cause sleep
	137	* to return 1, rather than longjmp.
	138	* Callers of this routine must be prepared for
	139	* premature return, and check that the reason for
	140	* sleeping has gone away.
91447636 A	141	*
	142	* if msleep was the entry point, than we have a mutex to deal with
	143	*
	144	* The mutex is unlocked before the caller is blocked, and
	145	* relocked before msleep returns unless the priority includes the PDROP
	146	* flag... if PDROP is specified, _sleep returns with the mutex unlocked
	147	* regardless of whether it actually blocked or not.
1c79356b A	148	*/
1c79356b A	149
9bccf70c A	150	static int
	151	_sleep(
	152	caddr_t chan,
91447636 A	153	int pri,
91447636 A	154	const char *wmsg,
9bccf70c	155	u_int64_t abstime,
91447636 A	156	int (*continuation)(int),
91447636 A	157	lck_mtx_t *mtx)
1c79356b	158	{
2d21ac55 A	159	struct proc *p;
2d21ac55 A	160	thread_t self = current_thread();
1c79356b	161	struct uthread * ut;
6d2010ae	162	int sig, catch;
91447636	163	int dropmutex = pri & PDROP;
b0d623f7	164	int spinmutex = pri & PSPIN;
9bccf70c	165	int wait_result;
1c79356b	166	int error = 0;
1c79356b	167
55e303ae	168	ut = get_bsdthread_info(self);
91447636	169
1c79356b	170	p = current_proc();
1c79356b	171	p->p_priority = pri & PRIMASK;
2d21ac55 A	172	/* It can still block in proc_exit() after the teardown. */
2d21ac55 A	173	if (p->p_stats != NULL)
b0d623f7	174	OSIncrementAtomicLong(&p->p_stats->p_ru.ru_nvcsw);
6d2010ae A	175
	176	if (pri & PCATCH)
	177	catch = THREAD_ABORTSAFE;
	178	else
	179	catch = THREAD_UNINT;
2d21ac55 A	180
	181	/* set wait message & channel */
	182	ut->uu_wchan = chan;
	183	ut->uu_wmesg = wmsg ? wmsg : "unknown";
91447636 A	184
91447636 A	185	if (mtx != NULL && chan != NULL && (thread_continue_t)continuation == THREAD_CONTINUE_NULL) {
6d2010ae A	186	int flags;
	187
	188	if (dropmutex)
	189	flags = LCK_SLEEP_UNLOCK;
	190	else
	191	flags = LCK_SLEEP_DEFAULT;
	192
	193	if (spinmutex)
	194	flags \|= LCK_SLEEP_SPIN;
91447636 A	195
91447636 A	196	if (abstime)
6d2010ae	197	wait_result = lck_mtx_sleep_deadline(mtx, flags, chan, catch, abstime);
91447636	198	else
6d2010ae	199	wait_result = lck_mtx_sleep(mtx, flags, chan, catch);
91447636 A	200	}
	201	else {
	202	if (chan != NULL)
6d2010ae	203	assert_wait_deadline(chan, catch, abstime);
91447636 A	204	if (mtx)
91447636 A	205	lck_mtx_unlock(mtx);
6d2010ae A	206
6d2010ae A	207	if (catch == THREAD_ABORTSAFE) {
91447636	208	if (SHOULDissignal(p,ut)) {
2d21ac55	209	if ((sig = CURSIG(p)) != 0) {
91447636 A	210	if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE)
91447636 A	211	goto block;
91447636 A	212	if (p->p_sigacts->ps_sigintr & sigmask(sig))
	213	error = EINTR;
	214	else
	215	error = ERESTART;
b0d623f7 A	216	if (mtx && !dropmutex) {
	217	if (spinmutex)
	218	lck_mtx_lock_spin(mtx);
	219	else
	220	lck_mtx_lock(mtx);
	221	}
1c79356b A	222	goto out;
1c79356b A	223	}
91447636 A	224	}
	225	if (thread_should_abort(self)) {
	226	if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE)
	227	goto block;
	228	error = EINTR;
	229
b0d623f7 A	230	if (mtx && !dropmutex) {
	231	if (spinmutex)
	232	lck_mtx_lock_spin(mtx);
	233	else
	234	lck_mtx_lock(mtx);
	235	}
1c79356b A	236	goto out;
1c79356b A	237	}
91447636	238	}
1c79356b	239
55e303ae	240
91447636 A	241	block:
	242	if ((thread_continue_t)continuation != THREAD_CONTINUE_NULL) {
	243	ut->uu_continuation = continuation;
	244	ut->uu_pri = pri;
	245	ut->uu_timo = abstime? 1: 0;
	246	ut->uu_mtx = mtx;
	247	(void) thread_block(_sleep_continue);
	248	/* NOTREACHED */
	249	}
	250
	251	wait_result = thread_block(THREAD_CONTINUE_NULL);
1c79356b	252
b0d623f7 A	253	if (mtx && !dropmutex) {
	254	if (spinmutex)
	255	lck_mtx_lock_spin(mtx);
	256	else
	257	lck_mtx_lock(mtx);
	258	}
1c79356b A	259	}
1c79356b A	260
9bccf70c	261	switch (wait_result) {
1c79356b A	262	case THREAD_TIMED_OUT:
	263	error = EWOULDBLOCK;
	264	break;
	265	case THREAD_AWAKENED:
39037602	266	case THREAD_RESTART:
1c79356b A	267	/*
	268	* Posix implies any signal should be delivered
	269	* first, regardless of whether awakened due
	270	* to receiving event.
	271	*/
6d2010ae	272	if (catch != THREAD_ABORTSAFE)
1c79356b A	273	break;
	274	/* else fall through */
	275	case THREAD_INTERRUPTED:
6d2010ae	276	if (catch == THREAD_ABORTSAFE) {
55e303ae	277	if (thread_should_abort(self)) {
1c79356b	278	error = EINTR;
91447636	279	} else if (SHOULDissignal(p, ut)) {
2d21ac55	280	if ((sig = CURSIG(p)) != 0) {
1c79356b A	281	if (p->p_sigacts->ps_sigintr & sigmask(sig))
	282	error = EINTR;
	283	else
	284	error = ERESTART;
	285	}
55e303ae	286	if (thread_should_abort(self)) {
1c79356b A	287	error = EINTR;
1c79356b A	288	}
b0d623f7 A	289	} else if( (ut->uu_flag & ( UT_CANCELDISABLE \| UT_CANCEL \| UT_CANCELED)) == UT_CANCEL) {
	290	/* due to thread cancel */
	291	error = EINTR;
	292	}
1c79356b A	293	} else
	294	error = EINTR;
	295	break;
	296	}
	297	out:
9bccf70c	298	if (error == EINTR \|\| error == ERESTART)
55e303ae	299	act_set_astbsd(self);
2d21ac55 A	300	ut->uu_wchan = NULL;
2d21ac55 A	301	ut->uu_wmesg = NULL;
91447636	302
1c79356b A	303	return (error);
	304	}
	305
9bccf70c A	306	int
	307	sleep(
	308	void *chan,
	309	int pri)
1c79356b	310	{
91447636 A	311	return _sleep((caddr_t)chan, pri, (char )NULL, 0, (int ()(int))0, (lck_mtx_t *)0);
	312	}
	313
	314	int
	315	msleep0(
	316	void *chan,
	317	lck_mtx_t *mtx,
	318	int pri,
	319	const char *wmsg,
	320	int timo,
	321	int (*continuation)(int))
	322	{
	323	u_int64_t abstime = 0;
	324
	325	if (timo)
	326	clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
	327
	328	return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, mtx);
	329	}
	330
	331	int
	332	msleep(
	333	void *chan,
	334	lck_mtx_t *mtx,
	335	int pri,
	336	const char *wmsg,
	337	struct timespec *ts)
	338	{
	339	u_int64_t abstime = 0;
	340
	341	if (ts && (ts->tv_sec \|\| ts->tv_nsec)) {
	342	nanoseconds_to_absolutetime((uint64_t)ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec, &abstime );
	343	clock_absolutetime_interval_to_deadline( abstime, &abstime );
	344	}
	345
	346	return _sleep((caddr_t)chan, pri, wmsg, abstime, (int (*)(int))0, mtx);
	347	}
	348
	349	int
	350	msleep1(
	351	void *chan,
	352	lck_mtx_t *mtx,
	353	int pri,
	354	const char *wmsg,
	355	u_int64_t abstime)
	356	{
	357	return _sleep((caddr_t)chan, pri, wmsg, abstime, (int (*)(int))0, mtx);
1c79356b A	358	}
1c79356b A	359
9bccf70c A	360	int
9bccf70c A	361	tsleep(
91447636	362	void *chan,
9bccf70c	363	int pri,
91447636	364	const char *wmsg,
9bccf70c A	365	int timo)
	366	{
	367	u_int64_t abstime = 0;
	368
	369	if (timo)
	370	clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
91447636	371	return _sleep((caddr_t)chan, pri, wmsg, abstime, (int ()(int))0, (lck_mtx_t )0);
1c79356b A	372	}
1c79356b A	373
9bccf70c A	374	int
9bccf70c A	375	tsleep0(
91447636	376	void *chan,
9bccf70c	377	int pri,
91447636	378	const char *wmsg,
9bccf70c A	379	int timo,
9bccf70c A	380	int (*continuation)(int))
1c79356b	381	{
9bccf70c A	382	u_int64_t abstime = 0;
	383
	384	if (timo)
	385	clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
91447636	386	return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, (lck_mtx_t *)0);
0b4e3aa0 A	387	}
0b4e3aa0 A	388
9bccf70c A	389	int
	390	tsleep1(
	391	void *chan,
91447636 A	392	int pri,
91447636 A	393	const char *wmsg,
9bccf70c	394	u_int64_t abstime,
91447636	395	int (*continuation)(int))
0b4e3aa0	396	{
91447636	397	return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, (lck_mtx_t *)0);
1c79356b A	398	}
	399
	400	/*
	401	* Wake up all processes sleeping on chan.
	402	*/
	403	void
2d21ac55	404	wakeup(void *chan)
1c79356b	405	{
6d2010ae	406	thread_wakeup((caddr_t)chan);
1c79356b A	407	}
	408
	409	/*
	410	* Wake up the first process sleeping on chan.
	411	*
	412	* Be very sure that the first process is really
	413	* the right one to wakeup.
	414	*/
9bccf70c	415	void
2d21ac55	416	wakeup_one(caddr_t chan)
1c79356b	417	{
6d2010ae	418	thread_wakeup_one((caddr_t)chan);
1c79356b A	419	}
	420
	421	/*
	422	* Compute the priority of a process when running in user mode.
	423	* Arrange to reschedule if the resulting priority is better
	424	* than that of the current process.
	425	*/
	426	void
2d21ac55	427	resetpriority(struct proc *p)
1c79356b	428	{
0b4e3aa0	429	(void)task_importance(p->task, -p->p_nice);
1c79356b	430	}
9bccf70c A	431
	432	struct loadavg averunnable =
	433	{ {0, 0, 0}, FSCALE }; /* load average, of runnable procs */
	434	/*
	435	* Constants for averages over 1, 5, and 15 minutes
	436	* when sampling at 5 second intervals.
	437	*/
	438	static fixpt_t cexp[3] = {
	439	(fixpt_t)(0.9200444146293232 * FSCALE), /* exp(-1/12) */
	440	(fixpt_t)(0.9834714538216174 * FSCALE), /* exp(-1/60) */
	441	(fixpt_t)(0.9944598480048967 * FSCALE), /* exp(-1/180) */
	442	};
	443
	444	void
2d21ac55	445	compute_averunnable(void *arg)
9bccf70c	446	{
91447636	447	unsigned int nrun = (unsigned int )arg;
9bccf70c	448	struct loadavg *avg = &averunnable;
2d21ac55	449	int i;
9bccf70c A	450
	451	for (i = 0; i < 3; i++)
	452	avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
	453	nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
	454	}