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JDK 1.1 Source Code Directory
JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes:
"C:\fyicenter\jdk-1.1.8\src".
Here is the list of Java classes of the JDK 1.1 source code:
✍: FYIcenter
⏎ java/lang/ThreadGroup.java
/* * @(#)ThreadGroup.java 1.37 01/12/10 * * Copyright 2002 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.lang; import java.io.PrintStream; import sun.misc.VM; /** * A thread group represents a set of threads. In addition, a thread * group can also include other thread groups. The thread groups form * a tree in which every thread group except the initial thread group * has a parent. * <p> * A thread is allowed to access information about its own thread * group, but not to access information about its thread group's * parent thread group or any other thread groups. * * @author unascribed * @version 1.37, 12/10/01 * @since JDK1.0 */ /* The locking strategy for this code is to try to lock only one level of the * tree wherever possible, but otherwise to lock from the bottom up. * That is, from child thread groups to parents. * This has the advantage of limiting the number of locks that need to be held * and in particular avoids having to grab the lock for the root thread group, * (or a global lock) which would be a source of contention on a * multi-processor system with many thread groups. * This policy often leads to taking a snapshot of the state of a thread group * and working off of that snapshot, rather than holding the thread group locked * while we work on the children. */ public class ThreadGroup { ThreadGroup parent; String name; int maxPriority; boolean destroyed; boolean daemon; boolean vmAllowSuspension; int nthreads; Thread threads[]; int ngroups; ThreadGroup groups[]; /** * Creates an empty Thread group that is not in any Thread group. * This method is used to create the system Thread group. */ private ThreadGroup() { // called from C code this.name = "system"; this.maxPriority = Thread.MAX_PRIORITY; } /** * Constructs a new thread group. The parent of this new group is * the thread group of the currently running thread. * * @param name the name of the new thread group. * @since JDK1.0 */ public ThreadGroup(String name) { this(Thread.currentThread().getThreadGroup(), name); } /** * Creates a new thread group. The parent of this new group is the * specified thread group. * <p> * The <code>checkAccess</code> method of the parent thread group is * called with no arguments; this may result in a security exception. * * @param parent the parent thread group. * @param name the name of the new thread group. * @exception NullPointerException if the thread group argument is * <code>null</code>. * @exception SecurityException if the current thread cannot create a * thread in the specified thread group. * @see java.lang.SecurityException * @see java.lang.ThreadGroup#checkAccess() * @since JDK1.0 */ public ThreadGroup(ThreadGroup parent, String name) { if (parent == null) { throw new NullPointerException(); } parent.checkAccess(); this.name = name; this.maxPriority = parent.maxPriority; this.daemon = parent.daemon; this.vmAllowSuspension = parent.vmAllowSuspension; this.parent = parent; parent.add(this); } /** * Returns the name of this thread group. * * @return the name of this thread group. * @since JDK1.0 */ public final String getName() { return name; } /** * Returns the parent of this thread group. * * @return the parent of this thread group. The top-level thread group * is the only thread group whose parent is <code>null</code>. * @since JDK1.0 */ public final ThreadGroup getParent() { checkAccess(); return parent; } /** * Returns the maximum priority of this thread group. Threads that are * part of this group cannot have a higher priority than the maximum * priority. * * @return the maximum priority that a thread in this thread group * can have. * @since JDK1.0 */ public final int getMaxPriority() { return maxPriority; } /** * Tests if this thread group is a daemon thread group. A * daemon thread group is automatically destroyed when its last * thread is stopped or its last thread group is destroyed. * * @return <code>true</code> if this thread group is a daemon thread group; * <code>false</code> otherwise. * @since JDK1.0 */ public final boolean isDaemon() { return daemon; } /** * Tests if this thread group has been destroyed. * * @since JDK1.1 */ public synchronized boolean isDestroyed() { return destroyed; } /** * Changes the daemon status of this thread group. * <p> * First, the <code>checkAccess</code> method of this thread group is * called with no arguments; this may result in a security exception. * <p> * A daemon thread group is automatically destroyed when its last * thread is stopped or its last thread group is destroyed. * * @param daemon if <code>true</code>, marks this thread group as * a daemon thread group; otherwise, marks this * thread group as normal. * @exception SecurityException if the current thread cannot modify * this thread. * @see java.lang.SecurityException * @see java.lang.ThreadGroup#checkAccess() * @since JDK1.0 */ public final void setDaemon(boolean daemon) { checkAccess(); this.daemon = daemon; } /** * Sets the maximum priority of the group. * <p> * First, the <code>checkAccess</code> method of this thread group is * called with no arguments; this may result in a security exception. * <p> * Threads in the thread group that already have a higher priority * are not affected. * * @param pri the new priority of the thread group. * @exception SecurityException if the current thread cannot modify * this thread group. * @see java.lang.SecurityException * @see java.lang.ThreadGroup#checkAccess() * @since JDK1.0 */ public final void setMaxPriority(int pri) { int ngroupsSnapshot; ThreadGroup[] groupsSnapshot; synchronized (this) { checkAccess(); if (pri < Thread.MIN_PRIORITY) { maxPriority = Thread.MIN_PRIORITY; } else if (pri < maxPriority) { maxPriority = pri; } ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } } for (int i = 0 ; i < ngroupsSnapshot ; i++) { groupsSnapshot[i].setMaxPriority(pri); } } /** * Tests if this thread group is either the thread group * argument or one of its ancestor thread groups. * * @param g a thread group. * @return <code>true</code> if this thread group is the thread group * argument or one of its ancestor thread groups; * <code>false</code> otherwise. * @since JDK1.0 */ public final boolean parentOf(ThreadGroup g) { for (; g != null ; g = g.parent) { if (g == this) { return true; } } return false; } /** * Determines if the currently running thread has permission to * modify this thread group. * <p> * If there is a security manager, its <code>checkAccess</code> method * is called with this thread group as its argument. This may result * in throwing a <code>SecurityException</code>. * * @exception SecurityException if the current thread is not allowed to * access this thread group. * @see java.lang.SecurityManager#checkAccess(java.lang.ThreadGroup) * @since JDK1.0 */ public final void checkAccess() { SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkAccess(this); } } /** * Returns an estimate of the number of active threads in this * thread group. * * @return the number of active threads in this thread group and in any * other thread group that has this thread group as an ancestor. * @since JDK1.0 */ public int activeCount() { int result; // Snapshot sub-group data so we don't hold this lock // while our children are computing. int ngroupsSnapshot; ThreadGroup[] groupsSnapshot; synchronized (this) { if (destroyed) { return 0; } result = nthreads; ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } } for (int i = 0 ; i < ngroupsSnapshot ; i++) { result += groupsSnapshot[i].activeCount(); } return result; } /** * Copies into the specified array every active thread in this * thread group and its subgroups. * <p> * An application should use the <code>activeCount</code> method to * get an estimate of how big the array should be. If the array is * too short to hold all the threads, the extra threads are silently * ignored. * * @param list an array into which to place the list of threads. * @return the number of threads put into the array. * @see java.lang.ThreadGroup#activeCount() * @since JDK1.0 */ public int enumerate(Thread list[]) { return enumerate(list, 0, true); } /** * Copies into the specified array every active thread in this * thread group. If the <code>recurse</code> flag is * <code>true</code>, references to every active thread in this * thread's subgroups are also included. If the array is too short to * hold all the threads, the extra threads are silently ignored. * <p> * An application should use the <code>activeCount</code> method to * get an estimate of how big the array should be. * * @param list an array into which to place the list of threads. * @param recurse a flag indicating whether also to include threads * in thread groups that are subgroups of this * thread group. * @return the number of threads placed into the array. * @see java.lang.ThreadGroup#activeCount() * @since JDK1.0 */ public int enumerate(Thread list[], boolean recurse) { return enumerate(list, 0, recurse); } private int enumerate(Thread list[], int n, boolean recurse) { int ngroupsSnapshot = 0; ThreadGroup[] groupsSnapshot = null; synchronized (this) { if (destroyed) { return 0; } int nt = nthreads; if (nt > list.length - n) { nt = list.length - n; } if (nt > 0) { System.arraycopy(threads, 0, list, n, nt); n += nt; } if (recurse) { ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } } } if (recurse) { for (int i = 0 ; i < ngroupsSnapshot ; i++) { n = groupsSnapshot[i].enumerate(list, n, true); } } return n; } /** * Returns an estimate of the number of active groups in this * thread group. * * @return the number of active thread groups with this thread group as * an ancestor. * @since JDK1.0 */ public int activeGroupCount() { int ngroupsSnapshot; ThreadGroup[] groupsSnapshot; synchronized (this) { if (destroyed) { return 0; } ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } } int n = ngroupsSnapshot; for (int i = 0 ; i < ngroupsSnapshot ; i++) { n += groupsSnapshot[i].activeGroupCount(); } return n; } /** * Copies into the specified array references to every active * subgroup in this thread group. * <p> * An application should use the <code>activeGroupCount</code> * method to get an estimate of how big the array should be. If the * array is too short to hold all the thread groups, the extra thread * groups are silently ignored. * * @param list an array into which to place the list of thread groups. * @return the number of thread groups put into the array. * @see java.lang.ThreadGroup#activeGroupCount() * @since JDK1.0 */ public int enumerate(ThreadGroup list[]) { return enumerate(list, 0, true); } /** * Copies into the specified array references to every active * subgroup in this thread group. If the <code>recurse</code> flag is * <code>true</code>, references to all active subgroups of the * subgroups and so forth are also included. * <p> * An application should use the <code>activeGroupCount</code> * method to get an estimate of how big the array should be. * * @param list an array into which to place the list of threads. * @param recurse a flag indicating whether to recursively enumerate * all included thread groups. * @return the number of thread groups put into the array. * @see java.lang.ThreadGroup#activeGroupCount() * @since JDK1.0 */ public int enumerate(ThreadGroup list[], boolean recurse) { return enumerate(list, 0, recurse); } private int enumerate(ThreadGroup list[], int n, boolean recurse) { int ngroupsSnapshot = 0; ThreadGroup[] groupsSnapshot = null; synchronized (this) { if (destroyed) { return 0; } int ng = ngroups; if (ng > list.length - n) { ng = list.length - n; } if (ng > 0) { System.arraycopy(groups, 0, list, n, ng); n += ng; } if (recurse) { ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } } } if (recurse) { for (int i = 0 ; i < ngroupsSnapshot ; i++) { n = groupsSnapshot[i].enumerate(list, n, true); } } return n; } /** * Stops all processes in this thread group. * <p> * First, the <code>checkAccess</code> method of this thread group is * called with no arguments; this may result in a security exception. * <p> * This method then calls the <code>stop</code> method on all the * threads in this thread group and in all of its subgroups. * * @exception SecurityException if the current thread is not allowed * to access this thread group or any of the threads in * the thread group. * @see java.lang.SecurityException * @see java.lang.Thread#stop() * @see java.lang.ThreadGroup#checkAccess() * @since JDK1.0 */ public final void stop() { if (stopOrSuspend(false)) Thread.currentThread().stop(); } /** * Suspends all processes in this thread group. * <p> * First, the <code>checkAccess</code> method of this thread group is * called with no arguments; this may result in a security exception. * <p> * This method then calls the <code>suspend</code> method on all the * threads in this thread group and in all of its subgroups. * * @exception SecurityException if the current thread is not allowed * to access this thread group or any of the threads in * the thread group. * @see java.lang.SecurityException * @see java.lang.Thread#suspend() * @see java.lang.ThreadGroup#checkAccess() * @since JDK1.0 */ public final void suspend() { if (stopOrSuspend(true)) Thread.currentThread().suspend(); } /** * Helper method: recursively stops or suspends (as directed by the * boolean argument) all of the threads in this thread group and its * subgroups, except the current thread. This method returns true * if (and only if) the current thread is found to be in this thread * group or one of its subgroups. */ private boolean stopOrSuspend(boolean suspend) { boolean suicide = false; Thread us = Thread.currentThread(); int ngroupsSnapshot; ThreadGroup[] groupsSnapshot = null; synchronized (this) { checkAccess(); for (int i = 0 ; i < nthreads ; i++) { if (threads[i]==us) suicide = true; else if (suspend) threads[i].suspend(); else threads[i].stop(); } ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } } for (int i = 0 ; i < ngroupsSnapshot ; i++) suicide = groupsSnapshot[i].stopOrSuspend(suspend) || suicide; return suicide; } /** * Resumes all processes in this thread group. * <p> * First, the <code>checkAccess</code> method of this thread group is * called with no arguments; this may result in a security exception. * <p> * This method then calls the <code>resume</code> method on all the * threads in this thread group and in all of its sub groups. * * @exception SecurityException if the current thread is not allowed to * access this thread group or any of the threads in the * thread group. * @see java.lang.SecurityException * @see java.lang.Thread#resume() * @see java.lang.ThreadGroup#checkAccess() * @since JDK1.0 */ public final void resume() { int ngroupsSnapshot; ThreadGroup[] groupsSnapshot; synchronized (this) { checkAccess(); for (int i = 0 ; i < nthreads ; i++) { threads[i].resume(); } ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } } for (int i = 0 ; i < ngroupsSnapshot ; i++) { groupsSnapshot[i].resume(); } } /** * Destroys this thread group and all of its subgroups. This thread * group must be empty, indicating that all threads that had been in * this thread group have since stopped. * * @exception IllegalThreadStateException if the thread group is not * empty or if the thread group has already been destroyed. * @exception SecurityException if the current thread cannot modify this * thread group. * @since JDK1.0 */ public final void destroy() { int ngroupsSnapshot; ThreadGroup[] groupsSnapshot; synchronized (this) { checkAccess(); if (destroyed || (nthreads > 0)) { throw new IllegalThreadStateException(); } ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } if (parent != null) { destroyed = true; ngroups = 0; groups = null; nthreads = 0; threads = null; } } for (int i = 0 ; i < ngroupsSnapshot ; i += 1) { groupsSnapshot[i].destroy(); } if (parent != null) { parent.remove(this); } } /** * Adds the specified Thread group to this group. * @param g the specified Thread group to be added * @exception IllegalThreadStateException If the Thread group has been destroyed. */ private final void add(ThreadGroup g){ synchronized (this) { if (destroyed) { throw new IllegalThreadStateException(); } if (groups == null) { groups = new ThreadGroup[4]; } else if (ngroups == groups.length) { ThreadGroup newgroups[] = new ThreadGroup[ngroups * 2]; System.arraycopy(groups, 0, newgroups, 0, ngroups); groups = newgroups; } groups[ngroups] = g; // This is done last so it doesn't matter in case the // thread is killed ngroups++; } } /** * Removes the specified Thread group from this group. * @param g the Thread group to be removed * @return if this Thread has already been destroyed. */ private void remove(ThreadGroup g) { synchronized (this) { if (destroyed) { return; } for (int i = 0 ; i < ngroups ; i++) { if (groups[i] == g) { ngroups -= 1; System.arraycopy(groups, i + 1, groups, i, ngroups - i); // Zap dangling reference to the dead group so that // the garbage collector will collect it. groups[ngroups] = null; break; } } if (nthreads == 0) { notifyAll(); } if (daemon && (nthreads == 0) && (ngroups == 0)) { destroy(); } } } /** * Adds the specified Thread to this group. * @param t the Thread to be added * @exception IllegalThreadStateException If the Thread group has been destroyed. */ void add(Thread t) { synchronized (this) { if (destroyed) { throw new IllegalThreadStateException(); } if (threads == null) { threads = new Thread[4]; } else if (nthreads == threads.length) { Thread newthreads[] = new Thread[nthreads * 2]; System.arraycopy(threads, 0, newthreads, 0, nthreads); threads = newthreads; } threads[nthreads] = t; // This is done last so it doesn't matter in case the // thread is killed nthreads++; } } /** * Removes the specified Thread from this group. * @param t the Thread to be removed * @return if the Thread has already been destroyed. */ void remove(Thread t) { synchronized (this) { if (destroyed) { return; } for (int i = 0 ; i < nthreads ; i++) { if (threads[i] == t) { System.arraycopy(threads, i + 1, threads, i, --nthreads - i); // Zap dangling reference to the dead thread so that // the garbage collector will collect it. threads[nthreads] = null; break; } } if (nthreads == 0) { notifyAll(); } if (daemon && (nthreads == 0) && (ngroups == 0)) { destroy(); } } } /** * Prints information about this thread group to the standard * output. This method is useful only for debugging. * * @since JDK1.0 */ public void list() { list(System.out, 0); } void list(PrintStream out, int indent) { int ngroupsSnapshot; ThreadGroup[] groupsSnapshot; synchronized (this) { for (int j = 0 ; j < indent ; j++) { out.print(" "); } out.println(this); indent += 4; for (int i = 0 ; i < nthreads ; i++) { for (int j = 0 ; j < indent ; j++) { out.print(" "); } out.println(threads[i]); } ngroupsSnapshot = ngroups; if (groups != null) { groupsSnapshot = new ThreadGroup[ngroupsSnapshot]; System.arraycopy(groups, 0, groupsSnapshot, 0, ngroupsSnapshot); } else { groupsSnapshot = null; } } for (int i = 0 ; i < ngroupsSnapshot ; i++) { groupsSnapshot[i].list(out, indent); } } /** * Called by the Java Virtual Machine when a thread in this * thread group stops because of an uncaught exception. * <p> * The <code>uncaughtException</code> method of * <code>ThreadGroup</code> does the following: * <ul> * <li>If this thread group has a parent thread group, the * <code>uncaughtException</code> method of that parent is called * with the same two arguments. * <li>Otherwise, this method determines if the <code>Throwable</code> * argument is an instance of <code>ThreadDeath</code>. If so, nothing * special is done. Otherwise, the <code>Throwable</code>'s * <code>printStackTrace</code> method is called to print a stack * backtrace to the standard error stream. * </ul> * <p> * Applications can override this method in subclasses of * <code>ThreadGroup</code> to provide alternative handling of * uncaught exceptions. * * @param t the thread that is about to exit. * @param e the uncaught exception. * @see java.lang.System#err * @see java.lang.ThreadDeath * @see java.lang.Throwable#printStackTrace(java.io.PrintStream) * @since JDK1.0 */ public void uncaughtException(Thread t, Throwable e) { if (parent != null) { parent.uncaughtException(t, e); } else if (!(e instanceof ThreadDeath)) { e.printStackTrace(System.err); } } /** * Used by VM to control lowmem implicit suspension. * * @since JDK1.1 */ public boolean allowThreadSuspension(boolean b) { this.vmAllowSuspension = b; if (!b) { VM.unsuspendSomeThreads(); } return true; } /** * Returns a string representation of this Thread group. * * @return a string representation of this thread group. * @since JDK1.0 */ public String toString() { return getClass().getName() + "[name=" + getName() + ",maxpri=" + maxPriority + "]"; } }
⏎ java/lang/ThreadGroup.java
Or download all of them as a single archive file:
File name: jdk-1.1.8-src.zip File size: 1574187 bytes Release date: 2018-11-16 Download
⇒ Backup JDK 1.1 Installation Directory
2018-11-17, 176954👍, 0💬
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