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 void ShenandoahEvacOOMHandler::enter_evacuation(Thread* thr) { 34 jint threads_in_evac = Atomic::load_acquire(&_threads_in_evac); 35 36 uint8_t level = ShenandoahThreadLocalData::push_evac_oom_scope(thr); 37 if ((threads_in_evac & OOM_MARKER_MASK) != 0) { 38 wait_for_no_evac_threads(); 39 return; 40 } 41 42 // Nesting case, this thread already registered 43 if (level != 0) { 44 return; 45 } 46 // Entering top level scope, register this thread. 47 register_thread_to_protocol(thr); 48 } 49 50 void ShenandoahEvacOOMHandler::leave_evacuation(Thread* thr) { 51 uint8_t level = ShenandoahThreadLocalData::pop_evac_oom_scope(thr); 52 // Not top level, just return 53 if (level > 1) { 54 return; 55 } 56 57 // Leaving top level scope, unregister this thread. 58 unregister_thread_to_protocol(thr); 59 } 60 61 ShenandoahEvacOOMScope::ShenandoahEvacOOMScope() : 62 _thread(Thread::current()) { 63 ShenandoahHeap::heap()->enter_evacuation(_thread); 64 } 65 66 ShenandoahEvacOOMScope::ShenandoahEvacOOMScope(Thread* t) : 67 _thread(t) { 68 ShenandoahHeap::heap()->enter_evacuation(_thread); 69 } 70 71 ShenandoahEvacOOMScope::~ShenandoahEvacOOMScope() { 72 ShenandoahHeap::heap()->leave_evacuation(_thread); 73 } 74 75 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHEVACOOMHANDLER_INLINE_HPP