duke@435: /*
duke@435:  * Copyright 2000-2005 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: inline bool GC_locker::is_active() {
duke@435:   return _lock_count > 0 || _jni_lock_count > 0;
duke@435: }
duke@435: 
duke@435: inline bool GC_locker::check_active_before_gc() {
duke@435:   if (is_active()) {
duke@435:     set_needs_gc();
duke@435:   }
duke@435:   return is_active();
duke@435: }
duke@435: 
duke@435: inline void GC_locker::lock() {
duke@435:   // cast away volatile
duke@435:   Atomic::inc(&_lock_count);
duke@435:   CHECK_UNHANDLED_OOPS_ONLY(
duke@435:     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
duke@435:   assert(Universe::heap() == NULL ||
duke@435:          !Universe::heap()->is_gc_active(), "locking failed");
duke@435: }
duke@435: 
duke@435: inline void GC_locker::unlock() {
duke@435:   // cast away volatile
duke@435:   Atomic::dec(&_lock_count);
duke@435:   CHECK_UNHANDLED_OOPS_ONLY(
duke@435:     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })
duke@435: }
duke@435: 
duke@435: inline void GC_locker::lock_critical(JavaThread* thread) {
duke@435:   if (!thread->in_critical()) {
duke@435:     if (!needs_gc()) {
duke@435:       jni_lock();
duke@435:     } else {
duke@435:       jni_lock_slow();
duke@435:     }
duke@435:   }
duke@435:   thread->enter_critical();
duke@435: }
duke@435: 
duke@435: inline void GC_locker::unlock_critical(JavaThread* thread) {
duke@435:   thread->exit_critical();
duke@435:   if (!thread->in_critical()) {
duke@435:     if (!needs_gc()) {
duke@435:       jni_unlock();
duke@435:     } else {
duke@435:       jni_unlock_slow();
duke@435:     }
duke@435:   }
duke@435: }