dtrace_anon.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License, Version 1.0 only
    6  * (the "License").  You may not use this file except in compliance
    7  * with the License.
    8  *
    9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   10  * or http://www.opensolaris.org/os/licensing.
   11  * See the License for the specific language governing permissions
   12  * and limitations under the License.
   13  *
   14  * When distributing Covered Code, include this CDDL HEADER in each
   15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   16  * If applicable, add the following below this CDDL HEADER, with the
   17  * fields enclosed by brackets "[]" replaced with your own identifying
   18  * information: Portions Copyright [yyyy] [name of copyright owner]
   19  *
   20  * CDDL HEADER END
   21  *
   22  * $FreeBSD$
   23  */
   24 
   25 /*
   26  * DTrace Anonymous Enabling Functions
   27  */
   28 static void
   29 dtrace_anon_init(void *dummy)
   30 {
   31         dtrace_state_t *state = NULL;
   32         dtrace_enabling_t *enab;
   33 
   34         mutex_enter(&cpu_lock);
   35         mutex_enter(&dtrace_provider_lock);
   36         mutex_enter(&dtrace_lock);
   37 
   38         dtrace_anon_property();
   39 
   40         mutex_exit(&cpu_lock);
   41 
   42         /*
   43          * If there are already providers, we must ask them to provide their
   44          * probes, and then match any anonymous enabling against them.  Note
   45          * that there should be no other retained enablings at this time:
   46          * the only retained enablings at this time should be the anonymous
   47          * enabling.
   48          */
   49         if (dtrace_anon.dta_enabling != NULL) {
   50                 ASSERT(dtrace_retained == dtrace_anon.dta_enabling);
   51 
   52                 dtrace_enabling_provide(NULL);
   53                 state = dtrace_anon.dta_state;
   54 
   55                 /*
   56                  * We couldn't hold cpu_lock across the above call to
   57                  * dtrace_enabling_provide(), but we must hold it to actually
   58                  * enable the probes.  We have to drop all of our locks, pick
   59                  * up cpu_lock, and regain our locks before matching the
   60                  * retained anonymous enabling.
   61                  */
   62                 mutex_exit(&dtrace_lock);
   63                 mutex_exit(&dtrace_provider_lock);
   64 
   65                 mutex_enter(&cpu_lock);
   66                 mutex_enter(&dtrace_provider_lock);
   67                 mutex_enter(&dtrace_lock);
   68 
   69                 if ((enab = dtrace_anon.dta_enabling) != NULL)
   70                         (void) dtrace_enabling_match(enab, NULL);
   71 
   72                 mutex_exit(&cpu_lock);
   73         }
   74 
   75         mutex_exit(&dtrace_provider_lock);
   76         mutex_exit(&dtrace_lock);
   77 
   78         if (state != NULL) {
   79                 /*
   80                  * If we created any anonymous state, set it going now.
   81                  */
   82                 (void) dtrace_state_go(state, &dtrace_anon.dta_beganon);
   83         }
   84 }

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FreeBSD/Linux Kernel Cross Reference sys/cddl/dev/dtrace/dtrace_anon.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/dev/dtrace/dtrace_anon.c