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.
22 *
23 */
24
25 #ifndef SHARE_RUNTIME_THREADSMR_INLINE_HPP
26 #define SHARE_RUNTIME_THREADSMR_INLINE_HPP
27
28 #include "runtime/atomic.hpp"
29 #include "memory/iterator.hpp"
30 #include "runtime/prefetch.inline.hpp"
31 #include "runtime/thread.inline.hpp"
32 #include "runtime/threadSMR.hpp"
33
34 // Devirtualize known thread closure types.
35 template <class T>
threads_do_dispatch(T * cl,JavaThread * const thread) const36 inline void ThreadsList::threads_do_dispatch(T *cl, JavaThread *const thread) const {
37 cl->T::do_thread(thread);
38 }
39
40 template <>
threads_do_dispatch(ThreadClosure * cl,JavaThread * const thread) const41 inline void ThreadsList::threads_do_dispatch<ThreadClosure>(ThreadClosure *cl, JavaThread *const thread) const {
42 cl->do_thread(thread);
43 }
44
45 template <class T>
threads_do(T * cl) const46 inline void ThreadsList::threads_do(T *cl) const {
47 const intx scan_interval = PrefetchScanIntervalInBytes;
48 JavaThread *const *const end = _threads + _length;
49 for (JavaThread *const *current_p = _threads; current_p != end; current_p++) {
50 Prefetch::read((void*)current_p, scan_interval);
51 JavaThread *const current = *current_p;
52 threads_do_dispatch(cl, current);
53 }
54 }
55
56 // These three inlines are private to ThreadsSMRSupport, but
57 // they are called by public inline update_tlh_stats() below:
58
add_tlh_times(uint add_value)59 inline void ThreadsSMRSupport::add_tlh_times(uint add_value) {
60 Atomic::add(&_tlh_times, add_value);
61 }
62
inc_tlh_cnt()63 inline void ThreadsSMRSupport::inc_tlh_cnt() {
64 Atomic::inc(&_tlh_cnt);
65 }
66
update_tlh_time_max(uint new_value)67 inline void ThreadsSMRSupport::update_tlh_time_max(uint new_value) {
68 while (true) {
69 uint cur_value = _tlh_time_max;
70 if (new_value <= cur_value) {
71 // No need to update max value so we're done.
72 break;
73 }
74 if (Atomic::cmpxchg(&_tlh_time_max, cur_value, new_value) == cur_value) {
75 // Updated max value so we're done. Otherwise try it all again.
76 break;
77 }
78 }
79 }
80
get_java_thread_list()81 inline ThreadsList* ThreadsSMRSupport::get_java_thread_list() {
82 return (ThreadsList*)Atomic::load_acquire(&_java_thread_list);
83 }
84
is_a_protected_JavaThread_with_lock(JavaThread * thread)85 inline bool ThreadsSMRSupport::is_a_protected_JavaThread_with_lock(JavaThread *thread) {
86 MutexLocker ml(Threads_lock->owned_by_self() ? NULL : Threads_lock);
87 return is_a_protected_JavaThread(thread);
88 }
89
update_tlh_stats(uint millis)90 inline void ThreadsSMRSupport::update_tlh_stats(uint millis) {
91 ThreadsSMRSupport::inc_tlh_cnt();
92 ThreadsSMRSupport::add_tlh_times(millis);
93 ThreadsSMRSupport::update_tlh_time_max(millis);
94 }
95
96 #endif // SHARE_RUNTIME_THREADSMR_INLINE_HPP
97