/*

 * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved.

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

 *

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

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

 * published by the Free Software Foundation.

 *

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

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

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

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

 * accompanied this code).

 *

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

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

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

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

inline bool GC_locker::is_active() {

  return _lock_count > 0 || _jni_lock_count > 0;

}

inline bool GC_locker::check_active_before_gc() {

  if (is_active()) {

    set_needs_gc();

  }

  return is_active();

}

inline void GC_locker::lock() {

  // cast away volatile

  Atomic::inc(&_lock_count);

  CHECK_UNHANDLED_OOPS_ONLY(

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

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

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

}

inline void GC_locker::unlock() {

  // cast away volatile

  Atomic::dec(&_lock_count);

  CHECK_UNHANDLED_OOPS_ONLY(

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

}

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

  if (!thread->in_critical()) {

    if (!needs_gc()) {

      jni_lock();

    } else {

      jni_lock_slow();

    }

  }

  thread->enter_critical();

}

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

  thread->exit_critical();

  if (!thread->in_critical()) {

    if (!needs_gc()) {

      jni_unlock();

    } else {

      jni_unlock_slow();

    }

  }

}