94 lines
2.7 KiB
Java
94 lines
2.7 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dalvik.system;
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import static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
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import android.annotation.SystemApi;
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import libcore.util.NonNull;
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import libcore.util.Nullable;
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/**
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* A class encapsulating a StackTraceElement and lock state. This adds
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* critical thread state to the standard stack trace information, which
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* can be used to detect deadlocks at the Java level.
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*
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* @hide
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*/
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@SystemApi(client = MODULE_LIBRARIES)
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public final class AnnotatedStackTraceElement {
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/**
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* The traditional StackTraceElement describing the Java stack frame.
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*/
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private StackTraceElement stackTraceElement;
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/**
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* An array containing objects that are locked in this frame. May be null.
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*/
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private Object[] heldLocks;
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/**
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* If this frame denotes the top of stack, {@code blockedOn} will hold
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* the object this thread is waiting to lock, or waiting on, if any. May be
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* null.
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*/
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private Object blockedOn;
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// Internal allocation, only.
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private AnnotatedStackTraceElement() {
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}
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/**
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* Returns the {@link StackTraceElement} describing the Java stack frame.
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*
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* @return {@link StackTraceElement} describing the Java stack frame.
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*
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* @hide
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*/
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@SystemApi(client = MODULE_LIBRARIES)
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@NonNull public StackTraceElement getStackTraceElement() {
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return stackTraceElement;
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}
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/**
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* Returns the objects this stack frame is synchronized on.
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* May be {@code null}.
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*
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* @return array of objects current frame is syncronized on.
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*
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* @hide
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*/
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@SystemApi(client = MODULE_LIBRARIES)
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@Nullable public Object[] getHeldLocks() {
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return heldLocks;
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}
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/**
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* Returns the object this stack frame is waiting on for synchronization.
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* May be {@code null}.
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*
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* @return object this thread is waiting to lock, or waiting on, if any,
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* or {@code null}, if none.
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*
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* @hide
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*/
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@SystemApi(client = MODULE_LIBRARIES)
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@Nullable public Object getBlockedOn() {
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return blockedOn;
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}
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}
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