1/*
2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "jni.h"
27#include "classfile/javaClasses.hpp"
28#include "classfile/symbolTable.hpp"
29#include "classfile/systemDictionary.hpp"
30#include "jfr/jni/jfrJavaSupport.hpp"
31#include "jfr/recorder/jfrRecorder.hpp"
32#include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"
33#include "jfr/recorder/service/jfrRecorderThread.hpp"
34#include "memory/resourceArea.hpp"
35#include "memory/universe.hpp"
36#include "runtime/handles.inline.hpp"
37#include "runtime/mutexLocker.hpp"
38#include "runtime/thread.inline.hpp"
39#include "utilities/preserveException.hpp"
40#include "utilities/macros.hpp"
41
42static Thread* start_thread(instanceHandle thread_oop, ThreadFunction proc, TRAPS) {
43 assert(thread_oop.not_null(), "invariant");
44 assert(proc != NULL, "invariant");
45
46 bool allocation_failed = false;
47 JavaThread* new_thread = NULL;
48 {
49 MutexLocker mu(Threads_lock);
50 new_thread = new JavaThread(proc);
51 // At this point it may be possible that no
52 // osthread was created for the JavaThread due to lack of memory.
53 if (new_thread == NULL || new_thread->osthread() == NULL) {
54 delete new_thread;
55 allocation_failed = true;
56 } else {
57 java_lang_Thread::set_thread(thread_oop(), new_thread);
58 java_lang_Thread::set_priority(thread_oop(), NormPriority);
59 java_lang_Thread::set_daemon(thread_oop());
60 new_thread->set_threadObj(thread_oop());
61 Threads::add(new_thread);
62 }
63 }
64 if (allocation_failed) {
65 JfrJavaSupport::throw_out_of_memory_error("Unable to create native recording thread for JFR", CHECK_NULL);
66 }
67
68 Thread::start(new_thread);
69 return new_thread;
70}
71
72JfrPostBox* JfrRecorderThread::_post_box = NULL;
73
74JfrPostBox& JfrRecorderThread::post_box() {
75 return *_post_box;
76}
77
78// defined in JfrRecorderThreadLoop.cpp
79void recorderthread_entry(JavaThread*, Thread*);
80
81bool JfrRecorderThread::start(JfrCheckpointManager* cp_manager, JfrPostBox* post_box, TRAPS) {
82 assert(cp_manager != NULL, "invariant");
83 assert(post_box != NULL, "invariant");
84 _post_box = post_box;
85
86 static const char klass[] = "jdk/jfr/internal/JVMUpcalls";
87 static const char method[] = "createRecorderThread";
88 static const char signature[] = "(Ljava/lang/ThreadGroup;Ljava/lang/ClassLoader;)Ljava/lang/Thread;";
89
90 JavaValue result(T_OBJECT);
91 JfrJavaArguments create_thread_args(&result, klass, method, signature, CHECK_false);
92
93 // arguments
94 create_thread_args.push_oop(Universe::system_thread_group());
95 create_thread_args.push_oop(SystemDictionary::java_system_loader());
96
97 JfrJavaSupport::call_static(&create_thread_args, CHECK_false);
98 instanceHandle h_thread_oop(THREAD, (instanceOop)result.get_jobject());
99 assert(h_thread_oop.not_null(), "invariant");
100 // attempt thread start
101 const Thread* const t = start_thread(h_thread_oop, recorderthread_entry,THREAD);
102 if (!HAS_PENDING_EXCEPTION) {
103 cp_manager->register_service_thread(t);
104 return true;
105 }
106 assert(HAS_PENDING_EXCEPTION, "invariant");
107 // Start failed, remove the thread from the system thread group
108 JavaValue void_result(T_VOID);
109 JfrJavaArguments remove_thread_args(&void_result);
110 remove_thread_args.set_klass(SystemDictionary::ThreadGroup_klass());
111 remove_thread_args.set_name(vmSymbols::remove_method_name());
112 remove_thread_args.set_signature(vmSymbols::thread_void_signature());
113 remove_thread_args.set_receiver(Universe::system_thread_group());
114 remove_thread_args.push_oop(h_thread_oop());
115 CautiouslyPreserveExceptionMark cpe(THREAD);
116 JfrJavaSupport::call_special(&remove_thread_args, THREAD);
117 return false;
118}
119