src/share/vm/memory/gcLocker.inline.hpp

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   1 /*
   2  * Copyright (c) 2000, 2005, 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 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 


  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 }


   1 /*
   2  * Copyright (c) 2000, 2010, 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 bool GC_locker::is_active() {
  31   return _lock_count > 0 || _jni_lock_count > 0;
  32 }
  33 
  34 inline bool GC_locker::check_active_before_gc() {
  35   if (is_active()) {
  36     set_needs_gc();
  37   }
  38   return is_active();
  39 }
  40 
  41 inline void GC_locker::lock() {
  42   // cast away volatile
  43   Atomic::inc(&_lock_count);
  44   CHECK_UNHANDLED_OOPS_ONLY(
  45     if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
  46   assert(Universe::heap() == NULL ||
  47          !Universe::heap()->is_gc_active(), "locking failed");
  48 }
  49 


  58   if (!thread->in_critical()) {
  59     if (!needs_gc()) {
  60       jni_lock();
  61     } else {
  62       jni_lock_slow();
  63     }
  64   }
  65   thread->enter_critical();
  66 }
  67 
  68 inline void GC_locker::unlock_critical(JavaThread* thread) {
  69   thread->exit_critical();
  70   if (!thread->in_critical()) {
  71     if (!needs_gc()) {
  72       jni_unlock();
  73     } else {
  74       jni_unlock_slow();
  75     }
  76   }
  77 }
  78 
  79 #endif // SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP