/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hadoop.hdfs.util;
/** Read-write lock interface. */
public interface RwLock {
/** Acquire read lock. */
public void readLock();
/**
* Acquire the long read lock, unless interrupted while waiting. The long
* read lock should also serve to block all concurrent writers.
**/
void longReadLockInterruptibly() throws InterruptedException;
/** Release the long read lock. */
public void longReadUnlock();
/** Release read lock. */
public void readUnlock();
/** Check if the current thread holds read lock. */
public boolean hasReadLock();
/** Acquire write lock. */
public void writeLock();
/** Acquire write lock, unless interrupted while waiting */
void writeLockInterruptibly() throws InterruptedException;
/** Release write lock. */
public void writeUnlock();
/** Check if the current thread holds write lock. */
public boolean hasWriteLock();
}