Showing the changes to java/pkg/sun/rmi/runtime/NewThreadAction.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2005, 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.rmi.runtime; | |
| 27 | + | |
| 28 | +import java.security.AccessController; | |
| 29 | +import java.security.PrivilegedAction; | |
| 30 | +import sun.security.util.SecurityConstants; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * A PrivilegedAction for creating a new thread conveniently with an | |
| 34 | + * AccessController.doPrivileged construct. | |
| 35 | + * | |
| 36 | + * All constructors allow the choice of the Runnable for the new | |
| 37 | + * thread to execute, the name of the new thread (which will be | |
| 38 | + * prefixed with "RMI "), and whether or not it will be a daemon | |
| 39 | + * thread. | |
| 40 | + * | |
| 41 | + * The new thread may be created in the system thread group (the root | |
| 42 | + * of the thread group tree) or an internally created non-system | |
| 43 | + * thread group, as specified at construction of this class. | |
| 44 | + * | |
| 45 | + * The new thread will have the system class loader as its initial | |
| 46 | + * context class loader (that is, its context class loader will NOT be | |
| 47 | + * inherited from the current thread). | |
| 48 | + * | |
| 49 | + * @author Peter Jones | |
| 50 | + **/ | |
| 51 | +public final class NewThreadAction implements PrivilegedAction<Thread> { | |
| 52 | + | |
| 53 | + /** cached reference to the system (root) thread group */ | |
| 54 | + static final ThreadGroup systemThreadGroup = | |
| 55 | + AccessController.doPrivileged(new PrivilegedAction<ThreadGroup>() { | |
| 56 | + public ThreadGroup run() { | |
| 57 | + ThreadGroup group = Thread.currentThread().getThreadGroup(); | |
| 58 | + ThreadGroup parent; | |
| 59 | + while ((parent = group.getParent()) != null) { | |
| 60 | + group = parent; | |
| 61 | + } | |
| 62 | + return group; | |
| 63 | + } | |
| 64 | + }); | |
| 65 | + | |
| 66 | + /** | |
| 67 | + * special child of the system thread group for running tasks that | |
| 68 | + * may execute user code, so that the security policy for threads in | |
| 69 | + * the system thread group will not apply | |
| 70 | + */ | |
| 71 | + static final ThreadGroup userThreadGroup = | |
| 72 | + AccessController.doPrivileged(new PrivilegedAction<ThreadGroup>() { | |
| 73 | + public ThreadGroup run() { | |
| 74 | + return new ThreadGroup(systemThreadGroup, "RMI Runtime"); | |
| 75 | + } | |
| 76 | + }); | |
| 77 | + | |
| 78 | + private final ThreadGroup group; | |
| 79 | + private final Runnable runnable; | |
| 80 | + private final String name; | |
| 81 | + private final boolean daemon; | |
| 82 | + | |
| 83 | + NewThreadAction(ThreadGroup group, Runnable runnable, | |
| 84 | + String name, boolean daemon) | |
| 85 | + { | |
| 86 | + this.group = group; | |
| 87 | + this.runnable = runnable; | |
| 88 | + this.name = name; | |
| 89 | + this.daemon = daemon; | |
| 90 | + } | |
| 91 | + | |
| 92 | + /** | |
| 93 | + * Creates an action that will create a new thread in the | |
| 94 | + * system thread group. | |
| 95 | + * | |
| 96 | + * @param runnable the Runnable for the new thread to execute | |
| 97 | + * | |
| 98 | + * @param name the name of the new thread | |
| 99 | + * | |
| 100 | + * @param daemon if true, new thread will be a daemon thread; | |
| 101 | + * if false, new thread will not be a daemon thread | |
| 102 | + */ | |
| 103 | + public NewThreadAction(Runnable runnable, String name, boolean daemon) { | |
| 104 | + this(systemThreadGroup, runnable, name, daemon); | |
| 105 | + } | |
| 106 | + | |
| 107 | + /** | |
| 108 | + * Creates an action that will create a new thread. | |
| 109 | + * | |
| 110 | + * @param runnable the Runnable for the new thread to execute | |
| 111 | + * | |
| 112 | + * @param name the name of the new thread | |
| 113 | + * | |
| 114 | + * @param daemon if true, new thread will be a daemon thread; | |
| 115 | + * if false, new thread will not be a daemon thread | |
| 116 | + * | |
| 117 | + * @param user if true, thread will be created in a non-system | |
| 118 | + * thread group; if false, thread will be created in the system | |
| 119 | + * thread group | |
| 120 | + */ | |
| 121 | + public NewThreadAction(Runnable runnable, String name, boolean daemon, | |
| 122 | + boolean user) | |
| 123 | + { | |
| 124 | + this(user ? userThreadGroup : systemThreadGroup, | |
| 125 | + runnable, name, daemon); | |
| 126 | + } | |
| 127 | + | |
| 128 | + public Thread run() { | |
| 129 | + SecurityManager sm = System.getSecurityManager(); | |
| 130 | + if (sm != null) { | |
| 131 | + sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); | |
| 132 | + } | |
| 133 | + Thread t = new Thread(group, runnable, "RMI " + name); | |
| 134 | + t.setContextClassLoader(ClassLoader.getSystemClassLoader()); | |
| 135 | + t.setDaemon(daemon); | |
| 136 | + return t; | |
| 137 | + } | |
| 138 | +} | |