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 #ifndef SHARE_VM_JFR_UTILITIES_JFRTHREADITERATOR_HPP

    26 #define SHARE_VM_JFR_UTILITIES_JFRTHREADITERATOR_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 #include "runtime/thread.hpp"

    30 #include "runtime/threadSMR.hpp"

    31 

    32 template <typename Adapter, typename AP = StackObj>

    33 class JfrThreadIterator : public AP {

    34  private:

    35   Adapter _adapter;

    36  public:

    37   JfrThreadIterator() : _adapter() {}

    38   typename Adapter::Type* next() {

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

    40     return _adapter.next();

    41   }

    42   bool has_next() const {

    43     return _adapter.has_next();

    44   }

    45 };

    46 

    47 class JfrJavaThreadIteratorAdapter {

    48  private:

    49   JavaThreadIteratorWithHandle _iter;

    50   JavaThread* _next;

    51  public:

    52   typedef JavaThread Type;

    53   JfrJavaThreadIteratorAdapter();

    54   bool has_next() const {

    55     return _next != NULL;

    56   }

    57   Type* next();

    58 };

    59 

    60 class JfrNonJavaThreadIteratorAdapter {

    61  private:

    62   NonJavaThread::Iterator _iter;

    63   NonJavaThread* _next;

    64  public:

    65   typedef NonJavaThread Type;

    66   JfrNonJavaThreadIteratorAdapter();

    67   bool has_next() const;

    68   Type* next();

    69 };

    70 

    71 typedef JfrThreadIterator<JfrJavaThreadIteratorAdapter, StackObj> JfrJavaThreadIterator;

    72 typedef JfrThreadIterator<JfrNonJavaThreadIteratorAdapter, StackObj> JfrNonJavaThreadIterator;

    73 

    74 #endif // SHARE_VM_JFR_UTILITIES_JFRTHREADITERATOR_HPP