1/*
2 * Copyright (c) 2017, 2019, 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.
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23 */
24
25#ifndef SHARE_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
26#define SHARE_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
27
28#include "runtime/safepointMechanism.hpp"
29#include "runtime/safepoint.hpp"
30#include "runtime/thread.inline.hpp"
31
32bool SafepointMechanism::local_poll_armed(JavaThread* thread) {
33 const intptr_t poll_word = reinterpret_cast<intptr_t>(thread->get_polling_page());
34 return mask_bits_are_true(poll_word, poll_bit());
35}
36
37bool SafepointMechanism::global_poll() {
38 return (SafepointSynchronize::_state != SafepointSynchronize::_not_synchronized);
39}
40
41bool SafepointMechanism::local_poll(Thread* thread) {
42 if (thread->is_Java_thread()) {
43 return local_poll_armed((JavaThread*)thread);
44 } else {
45 // If the poll is on a non-java thread we can only check the global state.
46 return global_poll();
47 }
48}
49
50bool SafepointMechanism::should_block(Thread* thread) {
51 if (uses_thread_local_poll()) {
52 return local_poll(thread);
53 } else {
54 return global_poll();
55 }
56}
57
58void SafepointMechanism::block_if_requested(JavaThread *thread) {
59 if (uses_thread_local_poll() && !local_poll_armed(thread)) {
60 return;
61 }
62 block_if_requested_slow(thread);
63}
64
65void SafepointMechanism::arm_local_poll(JavaThread* thread) {
66 thread->set_polling_page(poll_armed_value());
67}
68
69void SafepointMechanism::disarm_local_poll(JavaThread* thread) {
70 thread->set_polling_page(poll_disarmed_value());
71}
72
73void SafepointMechanism::disarm_if_needed(JavaThread* thread, bool memory_order_release) {
74 JavaThreadState jts = thread->thread_state();
75 if (jts == _thread_in_native || jts == _thread_in_native_trans) {
76 // JavaThread will disarm itself and execute cross_modify_fence() before continuing
77 return;
78 }
79 if (memory_order_release) {
80 thread->set_polling_page_release(poll_disarmed_value());
81 } else {
82 thread->set_polling_page(poll_disarmed_value());
83 }
84}
85
86void SafepointMechanism::arm_local_poll_release(JavaThread* thread) {
87 thread->set_polling_page_release(poll_armed_value());
88}
89
90void SafepointMechanism::disarm_local_poll_release(JavaThread* thread) {
91 thread->set_polling_page_release(poll_disarmed_value());
92}
93
94#endif // SHARE_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
95