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annotate graal/com.oracle.max.base/src/com/sun/max/util/SingleThread.java @ 4222:8e2985cdaaa5

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Renaming of VMExits and VMEntries part 3.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 04 Jan 2012 21:13:44 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.util;
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24
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25 import java.util.concurrent.*;
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26
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27 import com.sun.max.*;
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28 import com.sun.max.lang.*;
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29 import com.sun.max.program.*;
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30
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31 /**
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32 * Compute given functions in always one and the same single thread.
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33 *
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34 * This is for example necessary in Linux where one and
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35 * the same thread needs to be reused to represent the whole process in certain contexts,
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36 * e.g. when using the ptrace interface.
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37 */
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38 public class SingleThread extends Thread {
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39
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40 private static Thread worker;
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41 private static final ExecutorService executorService = Executors.newSingleThreadExecutor(new ThreadFactory() {
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42 public Thread newThread(Runnable runnable) {
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43 ProgramError.check(worker == null, "Single worker thread died unexpectedly");
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44 worker = new Thread(runnable);
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45 worker.setName("SingleThread");
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46 return worker;
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47 }
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48 });
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49
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50 private static final boolean disabled = false;
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51
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52 public static <V> V execute(Function<V> function) {
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53 if (disabled || Thread.currentThread() == worker) {
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54 try {
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55 return function.call();
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56 } catch (Exception exception) {
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57 throw ProgramError.unexpected(exception);
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58 }
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59 }
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60 synchronized (executorService) {
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61 final Future<V> future = executorService.submit(function);
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62 while (true) {
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63 try {
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64 return future.get();
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65 } catch (ExecutionException e) {
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66 throw Utils.cast(RuntimeException.class, e.getCause());
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67 } catch (InterruptedException exception) {
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68 // continue
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69 }
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70 }
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71 }
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72 }
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73
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74 public static <V> V executeWithException(Function<V> function) throws Exception {
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75 if (disabled || Thread.currentThread() == worker) {
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76 return function.call();
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77 }
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78 synchronized (executorService) {
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79 final Future<V> future = executorService.submit(function);
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80 while (true) {
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81 try {
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82 return future.get();
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83 } catch (ExecutionException e) {
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84 final Throwable cause = e.getCause();
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85 if (cause instanceof Exception) {
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86 throw (Exception) cause;
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87 }
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88 throw ProgramError.unexpected(cause);
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89 } catch (InterruptedException exception) {
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90 // continue
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91 }
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92 }
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93 }
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94 }
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95
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96 public static void execute(final Runnable runnable) {
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97 if (disabled || Thread.currentThread() == worker) {
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98 runnable.run();
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99 }
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100 synchronized (executorService) {
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101 final Future<?> future = executorService.submit(runnable);
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102 while (true) {
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103 try {
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104 future.get();
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105 return;
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106 } catch (ExecutionException e) {
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107 final Throwable cause = e.getCause();
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108 throw ProgramError.unexpected(cause);
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109
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110 } catch (InterruptedException exception) {
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111 // continue
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112 }
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113 }
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114 }
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115 }
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116 }