freebsd-dev/sys/cddl/dev/dtrace/dtrace_anon.c

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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
*
* $FreeBSD$
*/
/*
* DTrace Anonymous Enabling Functions
*/
static void
dtrace_anon_init(void *dummy)
{
dtrace_state_t *state = NULL;
dtrace_enabling_t *enab;
mutex_enter(&cpu_lock);
mutex_enter(&dtrace_provider_lock);
mutex_enter(&dtrace_lock);
dtrace_anon_property();
mutex_exit(&cpu_lock);
/*
* If there are already providers, we must ask them to provide their
* probes, and then match any anonymous enabling against them. Note
* that there should be no other retained enablings at this time:
* the only retained enablings at this time should be the anonymous
* enabling.
*/
if (dtrace_anon.dta_enabling != NULL) {
ASSERT(dtrace_retained == dtrace_anon.dta_enabling);
dtrace_enabling_provide(NULL);
state = dtrace_anon.dta_state;
/*
* We couldn't hold cpu_lock across the above call to
* dtrace_enabling_provide(), but we must hold it to actually
* enable the probes. We have to drop all of our locks, pick
* up cpu_lock, and regain our locks before matching the
* retained anonymous enabling.
*/
mutex_exit(&dtrace_lock);
mutex_exit(&dtrace_provider_lock);
mutex_enter(&cpu_lock);
mutex_enter(&dtrace_provider_lock);
mutex_enter(&dtrace_lock);
if ((enab = dtrace_anon.dta_enabling) != NULL)
(void) dtrace_enabling_match(enab, NULL);
mutex_exit(&cpu_lock);
}
mutex_exit(&dtrace_provider_lock);
mutex_exit(&dtrace_lock);
if (state != NULL) {
/*
* If we created any anonymous state, set it going now.
*/
(void) dtrace_state_go(state, &dtrace_anon.dta_beganon);
}
}