1 /* 2 * Copyright (c) 2020, Red Hat, Inc. 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_GC_SHENANDOAH_SHENANDOAHEVACOOMHANDLER_INLINE_HPP 26 #define SHARE_GC_SHENANDOAH_SHENANDOAHEVACOOMHANDLER_INLINE_HPP 27 28 #include "gc/shenandoah/shenandoahEvacOOMHandler.hpp" 29 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 30 #include "gc/shenandoah/shenandoahThreadLocalData.hpp" 31 #include "runtime/atomic.hpp" 32 33 jint ShenandoahEvacOOMCounter::load_acquire() { 34 return Atomic::load_acquire(&_bits); 35 } 36 37 jint ShenandoahEvacOOMCounter::unmasked_count() { 38 return Atomic::load_acquire(&_bits) & ~OOM_MARKER_MASK; 39 } 40 41 void ShenandoahEvacOOMHandler::enter_evacuation(Thread* thr) { 42 uint8_t level = ShenandoahThreadLocalData::push_evac_oom_scope(thr); 43 if (level == 0) { 44 // Entering top level scope, register this thread. 45 register_thread(thr); 46 } else if (!ShenandoahThreadLocalData::is_oom_during_evac(thr)) { 47 ShenandoahEvacOOMCounter* counter = counter_for_thread(thr); 48 jint threads_in_evac = counter->load_acquire(); 49 // If OOM is in progress, handle it. 50 if ((threads_in_evac & ShenandoahEvacOOMCounter::OOM_MARKER_MASK) != 0) { 51 counter->decrement(); 52 wait_for_no_evac_threads(); 53 } 54 } 55 } 56 57 void ShenandoahEvacOOMHandler::leave_evacuation(Thread* thr) { 58 uint8_t level = ShenandoahThreadLocalData::pop_evac_oom_scope(thr); 59 // Not top level, just return 60 if (level > 1) { 61 return; 62 } 63 64 // Leaving top level scope, unregister this thread. 65 unregister_thread(thr); 66 } 67 68 ShenandoahEvacOOMScope::ShenandoahEvacOOMScope() : 69 _thread(Thread::current()) { 70 ShenandoahHeap::heap()->enter_evacuation(_thread); 71 } 72 73 ShenandoahEvacOOMScope::ShenandoahEvacOOMScope(Thread* t) : 74 _thread(t) { 75 ShenandoahHeap::heap()->enter_evacuation(_thread); 76 } 77 78 ShenandoahEvacOOMScope::~ShenandoahEvacOOMScope() { 79 ShenandoahHeap::heap()->leave_evacuation(_thread); 80 } 81 82 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHEVACOOMHANDLER_INLINE_HPP