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/*
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* Copyright (c) 2016, 2019, 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/checkpoint/jfrCheckpointWriter.hpp"
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#include "jfr/recorder/checkpoint/types/jfrThreadGroup.hpp"
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#include "jfr/utilities/jfrTypes.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/jniHandles.inline.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/semaphore.hpp"
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#include "utilities/growableArray.hpp"
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static const int initial_array_size = 30;
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class ThreadGroupExclusiveAccess : public StackObj {
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private:
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static Semaphore _mutex_semaphore;
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public:
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ThreadGroupExclusiveAccess() { _mutex_semaphore.wait(); }
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~ThreadGroupExclusiveAccess() { _mutex_semaphore.signal(); }
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};
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Semaphore ThreadGroupExclusiveAccess::_mutex_semaphore(1);
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JfrThreadGroup* JfrThreadGroup::_instance = NULL;
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class JfrThreadGroupPointers : public ResourceObj {
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private:
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const Handle _thread_group_handle;
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jweak _thread_group_weak_ref;
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public:
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JfrThreadGroupPointers(Handle thread_group_handle, jweak thread_group_weak_ref);
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Handle thread_group_handle() const;
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jweak thread_group_weak_ref() const;
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oopDesc* const thread_group_oop() const;
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jweak transfer_weak_global_handle_ownership();
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void clear_weak_ref();
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};
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JfrThreadGroupPointers::JfrThreadGroupPointers(Handle thread_group_handle, jweak thread_group_weak_ref) :
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_thread_group_handle(thread_group_handle),
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_thread_group_weak_ref(thread_group_weak_ref) {}
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Handle JfrThreadGroupPointers::thread_group_handle() const {
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return _thread_group_handle;
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}
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jweak JfrThreadGroupPointers::thread_group_weak_ref() const {
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return _thread_group_weak_ref;
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}
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oopDesc* const JfrThreadGroupPointers::thread_group_oop() const {
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assert(_thread_group_weak_ref == NULL ||
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JNIHandles::resolve_non_null(_thread_group_weak_ref) == _thread_group_handle(), "invariant");
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return _thread_group_handle();
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}
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jweak JfrThreadGroupPointers::transfer_weak_global_handle_ownership() {
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jweak temp = _thread_group_weak_ref;
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_thread_group_weak_ref = NULL;
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return temp;
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}
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void JfrThreadGroupPointers::clear_weak_ref() {
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if (NULL != _thread_group_weak_ref) {
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JNIHandles::destroy_weak_global(_thread_group_weak_ref);
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}
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}
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class JfrThreadGroupsHelper : public ResourceObj {
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private:
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static const int invalid_iterator_pos = -1;
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GrowableArray<JfrThreadGroupPointers*>* _thread_group_hierarchy;
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int _current_iterator_pos;
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int populate_thread_group_hierarchy(const JavaThread* jt, Thread* current);
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JfrThreadGroupPointers& at(int index);
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public:
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JfrThreadGroupsHelper(const JavaThread* jt, Thread* current);
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~JfrThreadGroupsHelper();
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JfrThreadGroupPointers& next();
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bool is_valid() const;
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bool has_next() const;
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};
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JfrThreadGroupsHelper::JfrThreadGroupsHelper(const JavaThread* jt, Thread* current) {
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_thread_group_hierarchy = new GrowableArray<JfrThreadGroupPointers*>(10, false, mtTracing);
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_current_iterator_pos = populate_thread_group_hierarchy(jt, current) - 1;
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}
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JfrThreadGroupsHelper::~JfrThreadGroupsHelper() {
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assert(_current_iterator_pos == invalid_iterator_pos, "invariant");
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for (int i = 0; i < _thread_group_hierarchy->length(); ++i) {
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_thread_group_hierarchy->at(i)->clear_weak_ref();
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}
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}
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JfrThreadGroupPointers& JfrThreadGroupsHelper::at(int index) {
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assert(_thread_group_hierarchy != NULL, "invariant");
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assert(index > invalid_iterator_pos && index < _thread_group_hierarchy->length(), "invariant");
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return *(_thread_group_hierarchy->at(index));
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}
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bool JfrThreadGroupsHelper::has_next() const {
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return _current_iterator_pos > invalid_iterator_pos;
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}
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bool JfrThreadGroupsHelper::is_valid() const {
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return (_thread_group_hierarchy != NULL && _thread_group_hierarchy->length() > 0);
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}
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JfrThreadGroupPointers& JfrThreadGroupsHelper::next() {
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assert(is_valid(), "invariant");
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return at(_current_iterator_pos--);
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}
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/*
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* If not at a safepoint, we create global weak references for
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* all reachable threadgroups for this thread.
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* If we are at a safepoint, the caller is the VMThread during
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* JFR checkpointing. It can use naked oops, because nothing
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* will move before the list of threadgroups is cleared and
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* mutator threads restarted. The threadgroup list is cleared
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* later by the VMThread as one of the final steps in JFR checkpointing
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* (not here).
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*/
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int JfrThreadGroupsHelper::populate_thread_group_hierarchy(const JavaThread* jt, Thread* current) {
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assert(jt != NULL && jt->is_Java_thread(), "invariant");
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assert(current != NULL, "invariant");
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assert(_thread_group_hierarchy != NULL, "invariant");
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// immediate thread group
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Handle thread_group_handle(current, java_lang_Thread::threadGroup(jt->threadObj()));
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if (thread_group_handle == NULL) {
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return 0;
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}
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const bool use_weak_handles = !SafepointSynchronize::is_at_safepoint();
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jweak thread_group_weak_ref = use_weak_handles ? JNIHandles::make_weak_global(thread_group_handle) : NULL;
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JfrThreadGroupPointers* thread_group_pointers = new JfrThreadGroupPointers(thread_group_handle, thread_group_weak_ref);
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_thread_group_hierarchy->append(thread_group_pointers);
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// immediate parent thread group
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oop parent_thread_group_obj = java_lang_ThreadGroup::parent(thread_group_handle());
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Handle parent_thread_group_handle(current, parent_thread_group_obj);
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// and check parents parents...
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while (!(parent_thread_group_handle == NULL)) {
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const jweak parent_group_weak_ref = use_weak_handles ? JNIHandles::make_weak_global(parent_thread_group_handle) : NULL;
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thread_group_pointers = new JfrThreadGroupPointers(parent_thread_group_handle, parent_group_weak_ref);
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_thread_group_hierarchy->append(thread_group_pointers);
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parent_thread_group_obj = java_lang_ThreadGroup::parent(parent_thread_group_handle());
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parent_thread_group_handle = Handle(current, parent_thread_group_obj);
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}
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return _thread_group_hierarchy->length();
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}
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static traceid next_id() {
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static traceid _current_threadgroup_id = 0;
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return ++_current_threadgroup_id;
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}
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class JfrThreadGroup::JfrThreadGroupEntry : public JfrCHeapObj {
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friend class JfrThreadGroup;
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private:
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traceid _thread_group_id;
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traceid _parent_group_id;
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char* _thread_group_name; // utf8 format
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// If an entry is created during a safepoint, the
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// _thread_group_oop contains a direct oop to
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// the java.lang.ThreadGroup object.
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// If an entry is created on javathread exit time (not at safepoint),
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// _thread_group_weak_ref contains a JNI weak global handle
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// indirection to the java.lang.ThreadGroup object.
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// Note: we cannot use a union here since CHECK_UNHANDLED_OOPS makes oop have
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// a ctor which isn't allowed in a union by the SunStudio compiler
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oop _thread_group_oop;
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jweak _thread_group_weak_ref;
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JfrThreadGroupEntry(const char* tgstr, JfrThreadGroupPointers& ptrs);
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~JfrThreadGroupEntry();
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traceid thread_group_id() const { return _thread_group_id; }
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void set_thread_group_id(traceid tgid) { _thread_group_id = tgid; }
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const char* const thread_group_name() const { return _thread_group_name; }
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void set_thread_group_name(const char* tgname);
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traceid parent_group_id() const { return _parent_group_id; }
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void set_parent_group_id(traceid pgid) { _parent_group_id = pgid; }
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void set_thread_group(JfrThreadGroupPointers& ptrs);
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bool is_equal(const JfrThreadGroupPointers& ptrs) const;
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const oop thread_group() const;
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};
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JfrThreadGroup::JfrThreadGroupEntry::JfrThreadGroupEntry(const char* tgname, JfrThreadGroupPointers& ptrs) :
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_thread_group_id(0),
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_parent_group_id(0),
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_thread_group_name(NULL),
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_thread_group_oop(NULL),
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_thread_group_weak_ref(NULL) {
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set_thread_group_name(tgname);
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set_thread_group(ptrs);
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}
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JfrThreadGroup::JfrThreadGroupEntry::~JfrThreadGroupEntry() {
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if (_thread_group_name != NULL) {
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JfrCHeapObj::free(_thread_group_name, strlen(_thread_group_name) + 1);
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}
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if (_thread_group_weak_ref != NULL) {
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JNIHandles::destroy_weak_global(_thread_group_weak_ref);
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}
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}
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void JfrThreadGroup::JfrThreadGroupEntry::set_thread_group_name(const char* tgname) {
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assert(_thread_group_name == NULL, "invariant");
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if (tgname != NULL) {
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size_t len = strlen(tgname);
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_thread_group_name = JfrCHeapObj::new_array<char>(len + 1);
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strncpy(_thread_group_name, tgname, len + 1);
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}
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}
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const oop JfrThreadGroup::JfrThreadGroupEntry::thread_group() const {
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return _thread_group_weak_ref != NULL ? JNIHandles::resolve(_thread_group_weak_ref) : _thread_group_oop;
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}
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void JfrThreadGroup::JfrThreadGroupEntry::set_thread_group(JfrThreadGroupPointers& ptrs) {
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_thread_group_weak_ref = ptrs.transfer_weak_global_handle_ownership();
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if (_thread_group_weak_ref == NULL) {
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_thread_group_oop = ptrs.thread_group_oop();
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assert(_thread_group_oop != NULL, "invariant");
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} else {
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_thread_group_oop = NULL;
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}
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}
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JfrThreadGroup::JfrThreadGroup() :
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_list(new (ResourceObj::C_HEAP, mtTracing) GrowableArray<JfrThreadGroupEntry*>(initial_array_size, true, mtTracing)) {}
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JfrThreadGroup::~JfrThreadGroup() {
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if (_list != NULL) {
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for (int i = 0; i < _list->length(); i++) {
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JfrThreadGroupEntry* e = _list->at(i);
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delete e;
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}
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delete _list;
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}
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}
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JfrThreadGroup* JfrThreadGroup::instance() {
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return _instance;
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}
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void JfrThreadGroup::set_instance(JfrThreadGroup* new_instance) {
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_instance = new_instance;
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}
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traceid JfrThreadGroup::thread_group_id(const JavaThread* jt, Thread* current) {
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JfrThreadGroupsHelper helper(jt, current);
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return helper.is_valid() ? thread_group_id_internal(helper) : 0;
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}
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traceid JfrThreadGroup::thread_group_id(JavaThread* const jt) {
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return thread_group_id(jt, jt);
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}
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traceid JfrThreadGroup::thread_group_id_internal(JfrThreadGroupsHelper& helper) {
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ThreadGroupExclusiveAccess lock;
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JfrThreadGroup* tg_instance = instance();
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if (tg_instance == NULL) {
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tg_instance = new JfrThreadGroup();
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if (tg_instance == NULL) {
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return 0;
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}
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set_instance(tg_instance);
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}
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JfrThreadGroupEntry* tge = NULL;
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int parent_thread_group_id = 0;
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while (helper.has_next()) {
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JfrThreadGroupPointers& ptrs = helper.next();
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tge = tg_instance->find_entry(ptrs);
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if (NULL == tge) {
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tge = tg_instance->new_entry(ptrs);
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assert(tge != NULL, "invariant");
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tge->set_parent_group_id(parent_thread_group_id);
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}
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parent_thread_group_id = tge->thread_group_id();
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}
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// the last entry in the hierarchy is the immediate thread group
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return tge->thread_group_id();
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}
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bool JfrThreadGroup::JfrThreadGroupEntry::is_equal(const JfrThreadGroupPointers& ptrs) const {
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return ptrs.thread_group_oop() == thread_group();
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}
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JfrThreadGroup::JfrThreadGroupEntry*
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JfrThreadGroup::find_entry(const JfrThreadGroupPointers& ptrs) const {
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for (int index = 0; index < _list->length(); ++index) {
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JfrThreadGroupEntry* curtge = _list->at(index);
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if (curtge->is_equal(ptrs)) {
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return curtge;
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}
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}
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return (JfrThreadGroupEntry*) NULL;
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}
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// Assumes you already searched for the existence
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// of a corresponding entry in find_entry().
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JfrThreadGroup::JfrThreadGroupEntry*
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JfrThreadGroup::new_entry(JfrThreadGroupPointers& ptrs) {
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JfrThreadGroupEntry* const tge = new JfrThreadGroupEntry(java_lang_ThreadGroup::name(ptrs.thread_group_oop()), ptrs);
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add_entry(tge);
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return tge;
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}
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int JfrThreadGroup::add_entry(JfrThreadGroupEntry* tge) {
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assert(tge != NULL, "attempting to add a null entry!");
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assert(0 == tge->thread_group_id(), "id must be unassigned!");
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tge->set_thread_group_id(next_id());
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return _list->append(tge);
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}
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void JfrThreadGroup::write_thread_group_entries(JfrCheckpointWriter& writer) const {
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assert(_list != NULL && !_list->is_empty(), "should not need be here!");
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const int number_of_tg_entries = _list->length();
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writer.write_count(number_of_tg_entries);
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for (int index = 0; index < number_of_tg_entries; ++index) {
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const JfrThreadGroupEntry* const curtge = _list->at(index);
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writer.write_key(curtge->thread_group_id());
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writer.write(curtge->parent_group_id());
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writer.write(curtge->thread_group_name());
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}
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}
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void JfrThreadGroup::write_selective_thread_group(JfrCheckpointWriter* writer, traceid thread_group_id) const {
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assert(writer != NULL, "invariant");
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assert(_list != NULL && !_list->is_empty(), "should not need be here!");
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const int number_of_tg_entries = _list->length();
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// save context
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const JfrCheckpointContext ctx = writer->context();
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368 |
writer->write_type(TYPE_THREADGROUP);
|
|
369 |
const jlong count_offset = writer->reserve(sizeof(u4)); // Don't know how many yet
|
|
370 |
int number_of_entries_written = 0;
|
|
371 |
for (int index = number_of_tg_entries - 1; index >= 0; --index) {
|
|
372 |
const JfrThreadGroupEntry* const curtge = _list->at(index);
|
|
373 |
if (thread_group_id == curtge->thread_group_id()) {
|
|
374 |
writer->write_key(curtge->thread_group_id());
|
|
375 |
writer->write(curtge->parent_group_id());
|
|
376 |
writer->write(curtge->thread_group_name());
|
|
377 |
++number_of_entries_written;
|
|
378 |
thread_group_id = curtge->parent_group_id();
|
|
379 |
}
|
|
380 |
}
|
|
381 |
if (number_of_entries_written == 0) {
|
|
382 |
// nothing to write, restore context
|
|
383 |
writer->set_context(ctx);
|
|
384 |
return;
|
|
385 |
}
|
|
386 |
assert(number_of_entries_written > 0, "invariant");
|
|
387 |
writer->write_count(number_of_entries_written, count_offset);
|
|
388 |
}
|
|
389 |
|
|
390 |
// Write out JfrThreadGroup instance and then delete it
|
|
391 |
void JfrThreadGroup::serialize(JfrCheckpointWriter& writer) {
|
|
392 |
ThreadGroupExclusiveAccess lock;
|
|
393 |
JfrThreadGroup* tg_instance = instance();
|
|
394 |
assert(tg_instance != NULL, "invariant");
|
58863
|
395 |
tg_instance->write_thread_group_entries(writer);
|
50113
|
396 |
}
|
|
397 |
|
|
398 |
// for writing a particular thread group
|
|
399 |
void JfrThreadGroup::serialize(JfrCheckpointWriter* writer, traceid thread_group_id) {
|
|
400 |
assert(writer != NULL, "invariant");
|
|
401 |
ThreadGroupExclusiveAccess lock;
|
|
402 |
JfrThreadGroup* const tg_instance = instance();
|
|
403 |
assert(tg_instance != NULL, "invariant");
|
|
404 |
tg_instance->write_selective_thread_group(writer, thread_group_id);
|
|
405 |
}
|