| /* |
| * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_JFR_RECORDER_SERVICE_JFRPOSTBOX_HPP |
| #define SHARE_JFR_RECORDER_SERVICE_JFRPOSTBOX_HPP |
| |
| #include "jfr/utilities/jfrAllocation.hpp" |
| |
| #define MSGBIT(e) (1<<(e)) |
| |
| enum JFR_Msg { |
| MSG_ALL_MSGS = -1, |
| MSG_CLONE_IN_MEMORY = 0, |
| MSG_START, |
| MSG_STOP, |
| MSG_ROTATE, |
| MSG_FULLBUFFER, |
| MSG_CHECKPOINT, |
| MSG_WAKEUP, |
| MSG_SHUTDOWN, |
| MSG_VM_ERROR, |
| MSG_DEADBUFFER, |
| MSG_FLUSHPOINT, |
| MSG_NO_OF_MSGS |
| }; |
| |
| /** |
| * Jfr messaging. |
| * |
| * Synchronous messages (posting thread waits for message completion): |
| * |
| * MSG_CLONE_IN_MEMORY (0) ; MSGBIT(MSG_CLONE_IN_MEMORY) == (1 << 0) == 0x1 |
| * MSG_START(1) ; MSGBIT(MSG_START) == (1 << 0x1) == 0x2 |
| * MSG_STOP (2) ; MSGBIT(MSG_STOP) == (1 << 0x2) == 0x4 |
| * MSG_ROTATE (3) ; MSGBIT(MSG_ROTATE) == (1 << 0x3) == 0x8 |
| * MSG_VM_ERROR (8) ; MSGBIT(MSG_VM_ERROR) == (1 << 0x8) == 0x100 |
| * MSG_FLUSHPOINT (10) ; MSGBIT(MSG_FLUSHPOINT) == (1 << 0xa) == 0x400 |
| * |
| * Asynchronous messages (posting thread returns immediately upon deposit): |
| * |
| * MSG_FULLBUFFER (4) ; MSGBIT(MSG_FULLBUFFER) == (1 << 0x4) == 0x10 |
| * MSG_CHECKPOINT (5) ; MSGBIT(CHECKPOINT) == (1 << 0x5) == 0x20 |
| * MSG_WAKEUP (6) ; MSGBIT(WAKEUP) == (1 << 0x6) == 0x40 |
| * MSG_SHUTDOWN (7) ; MSGBIT(MSG_SHUTDOWN) == (1 << 0x7) == 0x80 |
| * MSG_DEADBUFFER (9) ; MSGBIT(MSG_DEADBUFFER) == (1 << 0x9) == 0x200 |
| */ |
| |
| class JfrPostBox : public JfrCHeapObj { |
| friend class JfrRecorder; |
| public: |
| void post(JFR_Msg msg); |
| |
| private: |
| uintptr_t _msg_read_serial; |
| uintptr_t _msg_handled_serial; |
| volatile int _messages; |
| bool _has_waiters; |
| |
| JfrPostBox(); |
| static JfrPostBox& instance(); |
| static JfrPostBox* create(); |
| static void destroy(); |
| |
| void asynchronous_post(int msg); |
| void synchronous_post(int msg); |
| void deposit(int new_messages); |
| bool is_message_processed(uintptr_t serial_id) const; |
| |
| friend void recorderthread_entry(JavaThread*, Thread*); |
| // for the friend declaration above |
| bool is_empty() const; |
| int collect(); |
| bool check_waiters(int messages) const; |
| void notify_waiters(); |
| void notify_collection_stop(); |
| }; |
| |
| #endif // SHARE_JFR_RECORDER_SERVICE_JFRPOSTBOX_HPP |