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/*
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* Copyright (c) 2012, 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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#include "precompiled.hpp"
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#include "jfr/recorder/jfrRecorder.hpp"
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#include "jfr/recorder/service/jfrPostBox.hpp"
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#include "jfr/recorder/service/jfrRecorderService.hpp"
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#include "jfr/recorder/service/jfrRecorderThread.hpp"
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#include "logging/log.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/thread.inline.hpp"
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//
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// Entry point for "JFR Recorder Thread" message loop.
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// The recorder thread executes service requests collected from the message system.
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//
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void recorderthread_entry(JavaThread* thread, Thread* unused) {
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assert(thread != NULL, "invariant");
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#define START (msgs & (MSGBIT(MSG_START)))
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#define SHUTDOWN (msgs & MSGBIT(MSG_SHUTDOWN))
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#define ROTATE (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP)))
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#define PROCESS_FULL_BUFFERS (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP)|MSGBIT(MSG_FULLBUFFER)))
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#define SCAVENGE (msgs & (MSGBIT(MSG_DEADBUFFER)))
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JfrPostBox& post_box = JfrRecorderThread::post_box();
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log_debug(jfr, system)("Recorder thread STARTED");
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{
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bool done = false;
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int msgs = 0;
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JfrRecorderService service;
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MutexLockerEx msg_lock(JfrMsg_lock);
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// JFR MESSAGE LOOP PROCESSING - BEGIN
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while (!done) {
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if (post_box.is_empty()) {
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JfrMsg_lock->wait(false);
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}
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msgs = post_box.collect();
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JfrMsg_lock->unlock();
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if (PROCESS_FULL_BUFFERS) {
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service.process_full_buffers();
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}
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if (SCAVENGE) {
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service.scavenge();
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}
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// Check amount of data written to chunk already
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// if it warrants asking for a new chunk
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service.evaluate_chunk_size_for_rotation();
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if (START) {
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service.start();
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} else if (ROTATE) {
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service.rotate(msgs);
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}
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JfrMsg_lock->lock();
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post_box.notify_waiters();
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if (SHUTDOWN) {
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log_debug(jfr, system)("Request to STOP recorder");
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done = true;
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}
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} // JFR MESSAGE LOOP PROCESSING - END
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} // JfrMsg_lock scope
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assert(!JfrMsg_lock->owned_by_self(), "invariant");
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post_box.notify_collection_stop();
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JfrRecorder::on_recorder_thread_exit();
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#undef START
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#undef SHUTDOWN
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#undef ROTATE
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#undef PROCESS_FULL_BUFFERS
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#undef SCAVENGE
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}
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