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 bool GC_locker::is_active() { 31 assert(_needs_gc || SafepointSynchronize::is_at_safepoint(), "only read at safepoint"); 32 verify_critical_count(); 33 return _lock_count > 0 || _jni_lock_count > 0; 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 call calls enter_critical under the lock so that the 56 // global lock count and per thread count are in agreement. 57 jni_lock(thread); 58 return; 59 } 60 increment_debug_jni_lock_count(); 61 } 62 thread->enter_critical(); 63 } 64 65 inline void GC_locker::unlock_critical(JavaThread* thread) { 66 if (thread->in_last_critical()) { 67 if (needs_gc()) { 68 // jni_unlock call calls exit_critical under the lock so that 69 // the global lock count and per thread count are in agreement. 70 jni_unlock(thread); 71 return; 72 } 73 decrement_debug_jni_lock_count(); 74 } 75 thread->exit_critical(); 76 } 77 78 #endif // SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP