/*
 * Copyright (C) 2006 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 gif;

class ConditionVariable {
    private volatile boolean mCondition;

    synchronized void set(boolean state) {
        if (state)
            open();
        else
            close();
    }

    synchronized void open() {
        boolean old = mCondition;
        mCondition = true;
        if (!old) {
            this.notify();
        }
    }

    synchronized void close() {
        mCondition = false;
    }

    synchronized void block() throws InterruptedException {
        while (!mCondition) {
            this.wait();
        }
    }
}