65 lines
2.0 KiB
Java
65 lines
2.0 KiB
Java
/*
|
|
* Copyright (C) 2014 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.android.internal.util;
|
|
|
|
/**
|
|
* Helper class that contains a strong reference to a VirtualRefBase native
|
|
* object. This will incStrong in the ctor, and decStrong in the finalizer.
|
|
* It currently does no accounting of natively allocated memory, for the
|
|
* benefit of either GC triggering or heap profiling.
|
|
*/
|
|
public final class VirtualRefBasePtr {
|
|
// TODO(b/231729094): Convert to NativeAllocationRegistry?
|
|
private long mNativePtr;
|
|
|
|
public VirtualRefBasePtr(long ptr) {
|
|
mNativePtr = ptr;
|
|
nIncStrong(mNativePtr);
|
|
}
|
|
|
|
/*
|
|
* Return the RefBase / VirtualLightRefBase native pointer. Warning: The
|
|
* caller must ensure that the VirtualRefBasePtr object remains reachable
|
|
* while the result is in use. Ideally, the caller should invoke
|
|
* {@link java.lang.ref.Reference#reachabilityFence}
|
|
* on the VirtualRefBasePtr object (or on an object that refers to it) as
|
|
* soon as the result is no longer needed.
|
|
*/
|
|
public long get() {
|
|
return mNativePtr;
|
|
}
|
|
|
|
public void release() {
|
|
if (mNativePtr != 0) {
|
|
nDecStrong(mNativePtr);
|
|
mNativePtr = 0;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void finalize() throws Throwable {
|
|
try {
|
|
release();
|
|
} finally {
|
|
super.finalize();
|
|
}
|
|
}
|
|
|
|
private static native void nIncStrong(long ptr);
|
|
private static native void nDecStrong(long ptr);
|
|
}
|