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 

    30 static bool thread_inclusion_predicate(Thread* t) {

    31   assert(t != NULL, "invariant");

    32   return !t->jfr_thread_local()->is_dead();

    33 }

    34 

    35 static bool java_thread_inclusion_predicate(JavaThread* jt) {

    36   assert(jt != NULL, "invariant");

    37   return thread_inclusion_predicate(jt) && jt->thread_state() != _thread_new;

    38 }

    39 

    40 static JavaThread* next_java_thread(JavaThreadIteratorWithHandle& iter) {

    41   JavaThread* next = iter.next();

    42   while (next != NULL && !java_thread_inclusion_predicate(next)) {

    43     next = iter.next();

    44   }

    45   return next;

    46 }

    47 

    48 static NonJavaThread* next_non_java_thread(NonJavaThread::Iterator& iter) {

    49   NonJavaThread* next = NULL;

    50   while (!iter.end()) {

    51     next = iter.current();

    52     iter.step();

    53     assert(next != NULL, "invariant");

    54     if (!thread_inclusion_predicate(next)) {

    55       continue;

    56     }

    57   }

    58   return next;

    59 }

    60 

    61 JfrJavaThreadIteratorAdapter::JfrJavaThreadIteratorAdapter() : _iter(), _next(next_java_thread(_iter)) {}

    62 

    63 JavaThread* JfrJavaThreadIteratorAdapter::next() {

    64   assert(has_next(), "invariant");

    65   Type* const temp = _next;

    66   _next = next_java_thread(_iter);

    67   assert(temp != _next, "invariant");

    68   return temp;

    69 }

    70 

    71 JfrNonJavaThreadIteratorAdapter::JfrNonJavaThreadIteratorAdapter() : _iter(), _next(next_non_java_thread(_iter)) {}

    72 

    73 bool JfrNonJavaThreadIteratorAdapter::has_next() const {

    74   return _next != NULL;

    75 }

    76 

    77 NonJavaThread* JfrNonJavaThreadIteratorAdapter::next() {

    78   assert(has_next(), "invariant");

    79   Type* const temp = _next;

    80   _next = next_non_java_thread(_iter);

    81   assert(temp != _next, "invariant");

    82   return temp;

    83 }

    84 

    85 // explicit instantiations

    86 template class JfrThreadIterator<JfrJavaThreadIteratorAdapter, StackObj>;

    87 template class JfrThreadIterator<JfrNonJavaThreadIteratorAdapter, StackObj>;