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 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(); 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 }