/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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.intellij.debugger.impl;

/**
 * @author lex
 */
public abstract class DebuggerTaskImpl implements DebuggerTask {
  private int myHolds = 0;

  @Override
  public synchronized final void release() {
    if (myHolds > 0) {
      if (--myHolds == 0) {
        notifyAll();
      }
    }
  }

  @Override
  public synchronized final void hold() {
    myHolds++;
  }

  @Override
  public synchronized final void waitFor() {
    while (myHolds > 0) {
      try {
        wait();
      }
      catch (InterruptedException ignored) {
      }
    }
  }
}
