jnr.ffi.annotations.Pinned Maven / Gradle / Ivy

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Shaded version of DataStax Java Driver for Apache Cassandra

There is a newer version: 3.6.0-1

/*
 * Copyright (C) 2008-2010 Wayne Meissner
 *
 * This file is part of the JNR 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 jnr.ffi.annotations;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Marks a method parameter as being pinnable.
 * 
 * This means the data for the parameter is not copied to/from native memory.
 * Instead, the JVM memory is locked and passed directly to the native code.
 * 
 * 
 * IMPORTANT: This should not be used for functions that may block on 
 * network or filesystem access such as read(2), write(2), stat(2).
 * 
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface Pinned {
}