1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package com.oracle.graal.hotspot.hsail; 24 25 import static com.oracle.graal.hotspot.hsail.HSAILHotSpotBackend.Options.*; 26 27 import java.util.concurrent.*; 28 29 import com.oracle.graal.hotspot.hsail.HSAILHotSpotBackend.Options; 30 31 /** 32 * Thread pool for HSAIL allocation support. 33 */ 34 public class DonorThreadPool { 35 36 private final Thread[] threads; 37 38 void waitAt(CyclicBarrier barrier) { 39 try { 40 barrier.await(); 41 } catch (Exception e) { 42 e.printStackTrace(); 43 } 44 } 45 46 /** 47 * Creates a pool of threads whose size is given by {@link Options#HsailDonorThreads}. 48 */ 49 DonorThreadPool() { 50 int size = HsailDonorThreads.getValue(); 51 this.threads = new Thread[size]; 52 CyclicBarrier barrier = new CyclicBarrier(size + 1); 53 54 // fill in threads 55 for (int i = 0; i < size; i++) { 56 threads[i] = new Thread(new Runnable() { 57 @Override 58 public void run() { 59 while (true) { 60 waitAt(barrier); 61 } 62 } 63 }, "HsailDonorThread-" + i); 64 threads[i].setDaemon(true); 65 threads[i].start(); 66 } 67 // creating thread waits at barrier to make sure others have started 68 waitAt(barrier); 69 } 70 71 public Thread[] getThreads() { 72 return threads; 73 } 74 }