--- /dev/null 2017-11-09 09:38:01.297999907 +0100 +++ new/src/hotspot/share/jfr/recorder/service/jfrRecorderThreadLoop.cpp 2018-04-09 15:13:43.224181577 +0200 @@ -0,0 +1,95 @@ +/* + * Copyright (c) 2012, 2018, 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. + * + */ + +#include "precompiled.hpp" +#include "jfr/recorder/jfrRecorder.hpp" +#include "jfr/recorder/service/jfrPostBox.hpp" +#include "jfr/recorder/service/jfrRecorderService.hpp" +#include "jfr/recorder/service/jfrRecorderThread.hpp" +#include "logging/log.hpp" +#include "runtime/mutexLocker.hpp" +#include "runtime/thread.inline.hpp" + +// +// Entry point for "JFR Recorder Thread" message loop. +// The recorder thread executes service requests collected from the message system. +// +void recorderthread_entry(JavaThread* thread, Thread* unused) { + assert(thread != NULL, "invariant"); + #define START (msgs & (MSGBIT(MSG_START))) + #define SHUTDOWN (msgs & MSGBIT(MSG_SHUTDOWN)) + #define ROTATE (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP))) + #define PROCESS_FULL_BUFFERS (msgs & (MSGBIT(MSG_ROTATE)|MSGBIT(MSG_STOP)|MSGBIT(MSG_FULLBUFFER))) + #define SCAVENGE (msgs & (MSGBIT(MSG_DEADBUFFER))) + + JfrPostBox& post_box = JfrRecorderThread::post_box(); + log_debug(jfr, system)("Recorder thread STARTED"); + + { + bool done = false; + int msgs = 0; + JfrRecorderService service; + MutexLockerEx msg_lock(JfrMsg_lock); + + // JFR MESSAGE LOOP PROCESSING - BEGIN + while (!done) { + if (post_box.is_empty()) { + JfrMsg_lock->wait(false); + } + msgs = post_box.collect(); + JfrMsg_lock->unlock(); + if (PROCESS_FULL_BUFFERS) { + service.process_full_buffers(); + } + if (SCAVENGE) { + service.scavenge(); + } + // Check amount of data written to chunk already + // if it warrants asking for a new chunk + service.evaluate_chunk_size_for_rotation(); + if (START) { + service.start(); + } else if (ROTATE) { + service.rotate(msgs); + } + JfrMsg_lock->lock(); + post_box.notify_waiters(); + if (SHUTDOWN) { + log_debug(jfr, system)("Request to STOP recorder"); + done = true; + } + } // JFR MESSAGE LOOP PROCESSING - END + + } // JfrMsg_lock scope + + assert(!JfrMsg_lock->owned_by_self(), "invariant"); + post_box.notify_collection_stop(); + JfrRecorder::on_recorder_thread_exit(); + + #undef START + #undef SHUTDOWN + #undef ROTATE + #undef PROCESS_FULL_BUFFERS + #undef SCAVENGE +}