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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
* $FreeBSD: release/9.1.0/sys/cddl/dev/dtrace/dtrace_vtime.c 179237 2008-05-23 05:59:42Z jb $
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
void
dtrace_vtime_enable(void)
{
dtrace_vtime_state_t state, nstate = 0;
do {
state = dtrace_vtime_active;
switch (state) {
case DTRACE_VTIME_INACTIVE:
nstate = DTRACE_VTIME_ACTIVE;
break;
case DTRACE_VTIME_INACTIVE_TNF:
nstate = DTRACE_VTIME_ACTIVE_TNF;
break;
case DTRACE_VTIME_ACTIVE:
case DTRACE_VTIME_ACTIVE_TNF:
panic("DTrace virtual time already enabled");
/*NOTREACHED*/
}
} while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
state, nstate) != state);
}
void
dtrace_vtime_disable(void)
{
dtrace_vtime_state_t state, nstate = 0;
do {
state = dtrace_vtime_active;
switch (state) {
case DTRACE_VTIME_ACTIVE:
nstate = DTRACE_VTIME_INACTIVE;
break;
case DTRACE_VTIME_ACTIVE_TNF:
nstate = DTRACE_VTIME_INACTIVE_TNF;
break;
case DTRACE_VTIME_INACTIVE:
case DTRACE_VTIME_INACTIVE_TNF:
panic("DTrace virtual time already disabled");
/*NOTREACHED*/
}
} while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
state, nstate) != state);
}
void
dtrace_vtime_switch(kthread_t *next)
{
dtrace_icookie_t cookie;
hrtime_t ts;
cookie = dtrace_interrupt_disable();
ts = dtrace_gethrtime();
if (curthread->t_dtrace_start != 0) {
curthread->t_dtrace_vtime += ts - curthread->t_dtrace_start;
curthread->t_dtrace_start = 0;
}
if (next != NULL)
next->t_dtrace_start = ts;
dtrace_interrupt_enable(cookie);
}