85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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* $FreeBSD$
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*/
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/*
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* DTrace Anonymous Enabling Functions
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*/
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static void
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dtrace_anon_init(void *dummy)
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{
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dtrace_state_t *state = NULL;
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dtrace_enabling_t *enab;
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mutex_enter(&cpu_lock);
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mutex_enter(&dtrace_provider_lock);
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mutex_enter(&dtrace_lock);
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dtrace_anon_property();
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mutex_exit(&cpu_lock);
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/*
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* If there are already providers, we must ask them to provide their
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* probes, and then match any anonymous enabling against them. Note
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* that there should be no other retained enablings at this time:
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* the only retained enablings at this time should be the anonymous
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* enabling.
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*/
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if (dtrace_anon.dta_enabling != NULL) {
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ASSERT(dtrace_retained == dtrace_anon.dta_enabling);
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dtrace_enabling_provide(NULL);
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state = dtrace_anon.dta_state;
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/*
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* We couldn't hold cpu_lock across the above call to
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* dtrace_enabling_provide(), but we must hold it to actually
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* enable the probes. We have to drop all of our locks, pick
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* up cpu_lock, and regain our locks before matching the
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* retained anonymous enabling.
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*/
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mutex_exit(&dtrace_lock);
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mutex_exit(&dtrace_provider_lock);
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mutex_enter(&cpu_lock);
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mutex_enter(&dtrace_provider_lock);
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mutex_enter(&dtrace_lock);
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if ((enab = dtrace_anon.dta_enabling) != NULL)
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(void) dtrace_enabling_match(enab, NULL);
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mutex_exit(&cpu_lock);
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}
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mutex_exit(&dtrace_provider_lock);
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mutex_exit(&dtrace_lock);
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if (state != NULL) {
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/*
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* If we created any anonymous state, set it going now.
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*/
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(void) dtrace_state_go(state, &dtrace_anon.dta_beganon);
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}
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}
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