109 lines
4.7 KiB
C++
109 lines
4.7 KiB
C++
/* Copyright (C) 2017 The Android Open Source Project
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This file implements interfaces from the file jvmti.h. This implementation
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* is licensed under the same terms as the file jvmti.h. The
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* copyright and license information for the file jvmti.h follows.
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*
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* Copyright (c) 2003, 2011, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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#ifndef ART_RUNTIME_OPENJDKJVMTI_TI_THREAD_H_
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#define ART_RUNTIME_OPENJDKJVMTI_TI_THREAD_H_
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#include "jni.h"
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#include "jvmti.h"
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#include "base/mutex.h"
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namespace art {
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class ArtField;
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class Thread;
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} // namespace art
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namespace openjdkjvmti {
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class EventHandler;
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class ThreadUtil {
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public:
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static void Register(EventHandler* event_handler);
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static void Unregister();
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// To be called when it is safe to cache data.
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static void CacheData();
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// Handle a jvmtiEnv going away.
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static void RemoveEnvironment(jvmtiEnv* env);
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static jvmtiError GetAllThreads(jvmtiEnv* env, jint* threads_count_ptr, jthread** threads_ptr);
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static jvmtiError GetCurrentThread(jvmtiEnv* env, jthread* thread_ptr);
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static jvmtiError GetThreadInfo(jvmtiEnv* env, jthread thread, jvmtiThreadInfo* info_ptr);
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static jvmtiError GetThreadState(jvmtiEnv* env, jthread thread, jint* thread_state_ptr);
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static jvmtiError SetThreadLocalStorage(jvmtiEnv* env, jthread thread, const void* data);
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static jvmtiError GetThreadLocalStorage(jvmtiEnv* env, jthread thread, void** data_ptr);
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static jvmtiError RunAgentThread(jvmtiEnv* env,
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jthread thread,
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jvmtiStartFunction proc,
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const void* arg,
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jint priority);
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static jvmtiError SuspendThread(jvmtiEnv* env, jthread thread);
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static jvmtiError ResumeThread(jvmtiEnv* env, jthread thread);
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static jvmtiError SuspendThreadList(jvmtiEnv* env,
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jint request_count,
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const jthread* threads,
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jvmtiError* results);
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static jvmtiError ResumeThreadList(jvmtiEnv* env,
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jint request_count,
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const jthread* threads,
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jvmtiError* results);
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private:
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// We need to make sure only one thread tries to suspend threads at a time so we can get the
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// 'suspend-only-once' behavior the spec requires. Internally, ART considers suspension to be a
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// counted state, allowing a single thread to be suspended multiple times by different users. This
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// makes mapping into the JVMTI idea of thread suspension difficult. We have decided to split the
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// difference and ensure that JVMTI tries to treat suspension as the boolean flag as much as
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// possible with the suspend/resume methods but only do best effort. On the other hand
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// GetThreadState will be totally accurate as much as possible. This means that calling
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// ResumeThread on a thread that has state JVMTI_THREAD_STATE_SUSPENDED will not necessarily
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// cause the thread to wake up if the thread is suspended for the debugger or gc or something.
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static jvmtiError SuspendSelf(art::Thread* self)
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REQUIRES(!art::Locks::mutator_lock_, !art::Locks::user_code_suspension_lock_);
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static jvmtiError SuspendOther(art::Thread* self, jthread target_jthread, art::Thread* target)
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REQUIRES(!art::Locks::mutator_lock_, !art::Locks::user_code_suspension_lock_);
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static art::ArtField* context_class_loader_;
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};
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} // namespace openjdkjvmti
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#endif // ART_RUNTIME_OPENJDKJVMTI_TI_THREAD_H_
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