1 /*
2 * Copyright (c) 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 #include "precompiled.hpp"
26 #include "jfr/support/jfrThreadLocal.hpp"
27 #include "jfr/utilities/jfrThreadIterator.hpp"
28 #include "runtime/thread.inline.hpp"
29
thread_inclusion_predicate(Thread * t)30 static bool thread_inclusion_predicate(Thread* t) {
31 assert(t != NULL, "invariant");
32 return !t->jfr_thread_local()->is_dead();
33 }
34
java_thread_inclusion_predicate(JavaThread * jt,bool live_only)35 static bool java_thread_inclusion_predicate(JavaThread* jt, bool live_only) {
36 assert(jt != NULL, "invariant");
37 if (live_only && jt->thread_state() == _thread_new) {
38 return false;
39 }
40 return thread_inclusion_predicate(jt);
41 }
42
next_java_thread(JavaThreadIteratorWithHandle & iter,bool live_only)43 static JavaThread* next_java_thread(JavaThreadIteratorWithHandle& iter, bool live_only) {
44 JavaThread* next = iter.next();
45 while (next != NULL && !java_thread_inclusion_predicate(next, live_only)) {
46 next = iter.next();
47 }
48 return next;
49 }
50
next_non_java_thread(NonJavaThread::Iterator & iter)51 static NonJavaThread* next_non_java_thread(NonJavaThread::Iterator& iter) {
52 while (!iter.end()) {
53 NonJavaThread* next = iter.current();
54 iter.step();
55 assert(next != NULL, "invariant");
56 if (thread_inclusion_predicate(next)) {
57 return next;
58 }
59 }
60 return NULL;
61 }
62
JfrJavaThreadIteratorAdapter(bool live_only)63 JfrJavaThreadIteratorAdapter::JfrJavaThreadIteratorAdapter(bool live_only /* true */) : _iter(),
64 _next(next_java_thread(_iter, live_only)),
65 _live_only(live_only) {}
66
next()67 JavaThread* JfrJavaThreadIteratorAdapter::next() {
68 assert(has_next(), "invariant");
69 Type* const temp = _next;
70 _next = next_java_thread(_iter, _live_only);
71 assert(temp != _next, "invariant");
72 return temp;
73 }
74
JfrNonJavaThreadIteratorAdapter(bool live_only)75 JfrNonJavaThreadIteratorAdapter::JfrNonJavaThreadIteratorAdapter(bool live_only /* true */) : _iter(), _next(next_non_java_thread(_iter)) {}
76
has_next() const77 bool JfrNonJavaThreadIteratorAdapter::has_next() const {
78 return _next != NULL;
79 }
80
next()81 NonJavaThread* JfrNonJavaThreadIteratorAdapter::next() {
82 assert(has_next(), "invariant");
83 Type* const temp = _next;
84 _next = next_non_java_thread(_iter);
85 assert(temp != _next, "invariant");
86 return temp;
87 }
88
89 // explicit instantiations
90 template class JfrThreadIterator<JfrJavaThreadIteratorAdapter, StackObj>;
91 template class JfrThreadIterator<JfrNonJavaThreadIteratorAdapter, StackObj>;
92