author | mgronlun |
Tue, 08 Oct 2019 11:57:11 +0200 | |
branch | JEP-349-branch |
changeset 58495 | 465ba4fefe62 |
parent 53244 | 9807daeb47c4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_RUNTIME_HANDSHAKE_HPP |
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#define SHARE_RUNTIME_HANDSHAKE_HPP |
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#include "memory/allocation.hpp" |
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#include "runtime/flags/flagSetting.hpp" |
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#include "runtime/semaphore.hpp" |
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class ThreadClosure; |
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class JavaThread; |
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// A handshake operation is a callback that is executed for each JavaThread |
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// while that thread is in a safepoint safe state. The callback is executed |
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// either by the thread itself or by the VM thread while keeping the thread |
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// in a blocked state. A handshake can be performed with a single |
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// JavaThread as well. |
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class Handshake : public AllStatic { |
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public: |
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// Execution of handshake operation |
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static void execute(ThreadClosure* thread_cl); |
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static bool execute(ThreadClosure* thread_cl, JavaThread* target); |
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}; |
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class HandshakeOperation; |
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// The HandshakeState keep tracks of an ongoing handshake for one JavaThread. |
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// VM thread and JavaThread are serialized with the semaphore making sure |
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// the operation is only done by either VM thread on behalf of the JavaThread |
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// or the JavaThread itself. |
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class HandshakeState { |
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HandshakeOperation* volatile _operation; |
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Semaphore _semaphore; |
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bool _thread_in_process_handshake; |
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bool claim_handshake_for_vmthread(); |
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bool vmthread_can_process_handshake(JavaThread* target); |
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void clear_handshake(JavaThread* thread); |
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void process_self_inner(JavaThread* thread); |
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public: |
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HandshakeState(); |
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void set_operation(JavaThread* thread, HandshakeOperation* op); |
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bool has_operation() const { |
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return _operation != NULL; |
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} |
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void process_by_self(JavaThread* thread) { |
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if (!_thread_in_process_handshake) { |
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FlagSetting fs(_thread_in_process_handshake, true); |
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process_self_inner(thread); |
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} |
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} |
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void process_by_vmthread(JavaThread* target); |
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}; |
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#endif // SHARE_RUNTIME_HANDSHAKE_HPP |