1 /*
   2  * Copyright (c) 2000, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP
  26 #define SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP
  27 
  28 #include "memory/gcLocker.hpp"
  29 
  30 inline void GC_locker::lock() {
  31   // cast away volatile
  32   Atomic::inc(&_lock_count);
  33   CHECK_UNHANDLED_OOPS_ONLY(
  34     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
  35   assert(Universe::heap() == NULL ||
  36          !Universe::heap()->is_gc_active(), "locking failed");
  37 }
  38 
  39 inline void GC_locker::unlock() {
  40   // cast away volatile
  41   Atomic::dec(&_lock_count);
  42   CHECK_UNHANDLED_OOPS_ONLY(
  43     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })
  44 }
  45 
  46 inline void GC_locker::lock_critical(JavaThread* thread) {
  47   if (!thread->in_critical()) {
  48     if (needs_gc()) {
  49       // jni_lock call calls enter_critical under the lock so that the
  50       // global lock count and per thread count are in agreement.
  51       jni_lock(thread);
  52       return;
  53     }
  54     increment_debug_jni_lock_count();
  55   }
  56   thread->enter_critical();
  57 }
  58 
  59 inline void GC_locker::unlock_critical(JavaThread* thread) {
  60   if (thread->in_last_critical()) {
  61     if (needs_gc()) {
  62       // jni_unlock call calls exit_critical under the lock so that
  63       // the global lock count and per thread count are in agreement.
  64       jni_unlock(thread);
  65       return;
  66     }
  67     decrement_debug_jni_lock_count();
  68   }
  69   thread->exit_critical();
  70 }
  71 
  72 #endif // SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP
--- EOF ---