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/*
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* Copyright (c) 2013, 2018, 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_VM_JFR_RECORDER_SERVICE_JFRPOSTBOX_HPP
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#define SHARE_VM_JFR_RECORDER_SERVICE_JFRPOSTBOX_HPP
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#include "jfr/utilities/jfrAllocation.hpp"
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#define MSGBIT(e) (1<<(e))
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enum JFR_Msg {
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MSG_ALL_MSGS = -1,
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MSG_CLONE_IN_MEMORY = 0,
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MSG_START,
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MSG_STOP,
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MSG_ROTATE,
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MSG_FULLBUFFER,
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MSG_CHECKPOINT,
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MSG_WAKEUP,
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MSG_SHUTDOWN,
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MSG_VM_ERROR,
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MSG_DEADBUFFER,
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MSG_NO_OF_MSGS
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};
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/**
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* Jfr messaging.
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*
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* Synchronous messages (posting thread waits for message completion):
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*
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* MSG_CLONE_IN_MEMORY (0) ; MSGBIT(MSG_CLONE_IN_MEMORY) == (1 << 0) == 0x1
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* MSG_START(1) ; MSGBIT(MSG_START) == (1 << 0x1) == 0x2
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* MSG_STOP (2) ; MSGBIT(MSG_STOP) == (1 << 0x2) == 0x4
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* MSG_ROTATE (3) ; MSGBIT(MSG_ROTATE) == (1 << 0x3) == 0x8
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* MSG_VM_ERROR (8) ; MSGBIT(MSG_VM_ERROR) == (1 << 8) == 0x100
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*
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* Asynchronous messages (posting thread returns immediately upon deposit):
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*
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* MSG_FULLBUFFER (4) ; MSGBIT(MSG_FULLBUFFER) == (1 << 0x4) == 0x10
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* MSG_CHECKPOINT (5) ; MSGBIT(CHECKPOINT) == (1 << 5) == 0x20
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* MSG_WAKEUP (6) ; MSGBIT(WAKEUP) == (1 << 6) == 0x40
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* MSG_SHUTDOWN (7) ; MSGBIT(MSG_SHUTDOWN) == (1 << 7) == 0x80
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* MSG_DEADBUFFER (9) ; MSGBIT(MSG_DEADBUFFER) == (1 << 9) == 0x200
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*/
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class JfrPostBox : public JfrCHeapObj {
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friend class JfrRecorder;
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public:
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void post(JFR_Msg msg);
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private:
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uintptr_t _msg_read_serial;
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uintptr_t _msg_handled_serial;
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volatile int _messages;
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bool _has_waiters;
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JfrPostBox();
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static JfrPostBox& instance();
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static JfrPostBox* create();
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static void destroy();
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void asynchronous_post(int msg);
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void synchronous_post(int msg);
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void deposit(int new_messages);
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bool is_message_processed(uintptr_t serial_id) const;
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friend void recorderthread_entry(JavaThread*, Thread*);
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// for the friend declaration above
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bool is_empty() const;
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int collect();
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bool check_waiters(int messages) const;
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void notify_waiters();
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void notify_collection_stop();
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};
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#endif // SHARE_VM_JFR_RECORDER_SERVICE_JFRPOSTBOX_HPP
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