1 /* 2 * Copyright (C) 2017 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 17 package art; 18 19 public class Test1906 { 20 public static final Object lock = new Object(); 21 22 public static volatile boolean SECOND_THREAD_RUN = true; 23 public static volatile boolean SECOND_THREAD_RUNNING = false; 24 waitFor(long millis)25 public static void waitFor(long millis) { 26 try { 27 lock.wait(millis); 28 } catch (Exception e) { 29 System.out.println("Unexpected error: " + e); 30 e.printStackTrace(); 31 } 32 } 33 waitForSuspension(Thread target)34 public static void waitForSuspension(Thread target) { 35 while (!Suspension.isSuspended(target)) { 36 waitFor(100); 37 } 38 } 39 run()40 public static void run() { 41 synchronized (lock) { 42 final Thread second_thread = new Thread( 43 () -> { 44 while (SECOND_THREAD_RUN) { SECOND_THREAD_RUNNING = true; } 45 }, 46 "SECONDARY THREAD"); 47 Thread self_thread = new Thread( 48 () -> { 49 try { 50 // Wait for second thread to start doing stuff. 51 while (!SECOND_THREAD_RUNNING) { } 52 Suspension.suspendList(Thread.currentThread(), second_thread); 53 } catch (Throwable t) { 54 System.out.println("Unexpected error occurred " + t); 55 t.printStackTrace(); 56 Runtime.getRuntime().halt(2); 57 } 58 }, 59 "TARGET THREAD"); 60 try { 61 second_thread.start(); 62 self_thread.start(); 63 64 waitForSuspension(self_thread); 65 66 // Wait to see if second thread is running. 67 SECOND_THREAD_RUNNING = false; 68 waitFor(1000); 69 70 if (SECOND_THREAD_RUNNING) { 71 System.out.println("Second thread running after first thread suspended self!"); 72 } else { 73 System.out.println("Second thread suspended before first thread suspended self!"); 74 } 75 76 Suspension.resume(self_thread); 77 waitForSuspension(second_thread); 78 Suspension.resume(second_thread); 79 self_thread.join(); 80 SECOND_THREAD_RUN = false; 81 second_thread.join(); 82 } catch (Throwable t) { 83 System.out.println("something was thrown. Runtime might be in unrecoverable state: " + t); 84 t.printStackTrace(); 85 Runtime.getRuntime().halt(2); 86 } 87 } 88 } 89 } 90