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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 /*
     23  * Copyright 1997-2003 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include <sys/types.h>
     30 #include <sys/inttypes.h>
     31 #include <sys/time.h>
     32 #include <sys/thread.h>
     33 #include <sys/cpuvar.h>
     34 #include <sys/cyclic.h>
     35 #include <sys/lockstat.h>
     36 #include <sys/spl.h>
     37 
     38 /*
     39  * Resident support for the lockstat driver.
     40  */
     41 
     42 dtrace_id_t lockstat_probemap[LS_NPROBES];
     43 void (*lockstat_probe)(dtrace_id_t, uintptr_t, uintptr_t,
     44     uintptr_t, uintptr_t, uintptr_t);
     45 
     46 int
     47 lockstat_active_threads(void)
     48 {
     49 	kthread_t *tp;
     50 	int active = 0;
     51 
     52 	mutex_enter(&pidlock);
     53 	tp = curthread;
     54 	do {
     55 		if (tp->t_lockstat)
     56 			active++;
     57 	} while ((tp = tp->t_next) != curthread);
     58 	mutex_exit(&pidlock);
     59 	return (active);
     60 }
     61