1 /*

     2  * Copyright 2000-2005 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 inline bool GC_locker::is_active() {

    26   return _lock_count > 0 || _jni_lock_count > 0;

    27 }

    28 

    29 inline bool GC_locker::check_active_before_gc() {

    30   if (is_active()) {

    31     set_needs_gc();

    32   }

    33   return is_active();

    34 }

    35 

    36 inline void GC_locker::lock() {

    37   // cast away volatile

    38   Atomic::inc(&_lock_count);

    39   CHECK_UNHANDLED_OOPS_ONLY(

    40     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })

    41   assert(Universe::heap() == NULL ||

    42          !Universe::heap()->is_gc_active(), "locking failed");

    43 }

    44 

    45 inline void GC_locker::unlock() {

    46   // cast away volatile

    47   Atomic::dec(&_lock_count);

    48   CHECK_UNHANDLED_OOPS_ONLY(

    49     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })

    50 }

    51 

    52 inline void GC_locker::lock_critical(JavaThread* thread) {

    53   if (!thread->in_critical()) {

    54     if (!needs_gc()) {

    55       jni_lock();

    56     } else {

    57       jni_lock_slow();

    58     }

    59   }

    60   thread->enter_critical();

    61 }

    62 

    63 inline void GC_locker::unlock_critical(JavaThread* thread) {

    64   thread->exit_critical();

    65   if (!thread->in_critical()) {

    66     if (!needs_gc()) {

    67       jni_unlock();

    68     } else {

    69       jni_unlock_slow();

    70     }

    71   }

    72 }