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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package android.os.cts;
     17 
     18 import junit.framework.TestCase;
     19 
     20 import android.os.ConditionVariable;
     21 
     22 import com.android.compatibility.common.util.TestThread;
     23 
     24 public class ConditionVariableTest extends TestCase {
     25     private static final int WAIT_TIME = 3000;
     26     private static final int BLOCK_TIME = 1000;
     27     private static final int BLOCK_TIME_DELTA = 200;
     28     private static final int SLEEP_TIME = 1000;
     29     private static final int TOLERANCE_MS = BLOCK_TIME;
     30     private ConditionVariable mConditionVariable;
     31 
     32     @Override
     33     protected void setUp() throws Exception {
     34         super.setUp();
     35         mConditionVariable = new ConditionVariable();
     36     }
     37 
     38     public void testConstructor() {
     39         assertFalse(mConditionVariable.block(BLOCK_TIME));
     40         assertFalse(new ConditionVariable(false).block(BLOCK_TIME));
     41         assertTrue(new ConditionVariable(true).block(BLOCK_TIME));
     42     }
     43 
     44     public void testConditionVariable() throws Throwable {
     45         // test open then block(long)
     46         mConditionVariable.open();
     47         long time = System.currentTimeMillis();
     48         assertTrue(mConditionVariable.block(BLOCK_TIME));
     49         assertTrue(System.currentTimeMillis() - time < TOLERANCE_MS);
     50 
     51         // test close then block(long)
     52         mConditionVariable.close();
     53         time = System.currentTimeMillis();
     54         assertFalse(mConditionVariable.block(BLOCK_TIME));
     55         assertTrue(System.currentTimeMillis() - time >= BLOCK_TIME);
     56 
     57         // test block then open
     58         time = System.currentTimeMillis();
     59         TestThread t = new TestThread(new Runnable() {
     60 
     61             public void run() {
     62                 try {
     63                     Thread.sleep(SLEEP_TIME);
     64                 } catch (InterruptedException e) {
     65                     fail(e.getMessage());
     66                 }
     67                 mConditionVariable.open();
     68             }
     69         });
     70 
     71         t.start();
     72         mConditionVariable.block();
     73         long timeDelta = System.currentTimeMillis() - time;
     74         assertTrue(timeDelta >= BLOCK_TIME && timeDelta <= BLOCK_TIME + BLOCK_TIME_DELTA);
     75         t.joinAndCheck(WAIT_TIME);
     76 
     77         time = System.currentTimeMillis();
     78         t = new TestThread(new Runnable() {
     79 
     80             public void run() {
     81                 try {
     82                     Thread.sleep(BLOCK_TIME >> 1);
     83                 } catch (InterruptedException e) {
     84                     fail(e.getMessage());
     85                 }
     86                 mConditionVariable.open();
     87             }
     88         });
     89         t.start();
     90 
     91         assertTrue(mConditionVariable.block(BLOCK_TIME));
     92         t.joinAndCheck(WAIT_TIME);
     93     }
     94 }
     95