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