kernel/os/lockstat_subr.c

   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 }