112 lines
3.4 KiB
Java
112 lines
3.4 KiB
Java
/*
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* Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.ch;
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// Special-purpose data structure for sets of native threads
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class NativeThreadSet {
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private long[] elts;
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private int used = 0;
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private boolean waitingToEmpty;
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NativeThreadSet(int n) {
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elts = new long[n];
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}
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// Adds the current native thread to this set, returning its index so that
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// it can efficiently be removed later.
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//
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int add() {
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long th = NativeThread.current();
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// 0 and -1 are treated as placeholders, not real thread handles
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if (th == 0)
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th = -1;
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synchronized (this) {
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int start = 0;
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if (used >= elts.length) {
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int on = elts.length;
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int nn = on * 2;
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long[] nelts = new long[nn];
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System.arraycopy(elts, 0, nelts, 0, on);
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elts = nelts;
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start = on;
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}
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for (int i = start; i < elts.length; i++) {
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if (elts[i] == 0) {
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elts[i] = th;
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used++;
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return i;
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}
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}
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assert false;
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return -1;
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}
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}
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// Removes the thread at the given index.
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//
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void remove(int i) {
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synchronized (this) {
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elts[i] = 0;
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used--;
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if (used == 0 && waitingToEmpty)
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notifyAll();
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}
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}
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// Signals all threads in this set.
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//
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synchronized void signalAndWait() {
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boolean interrupted = false;
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while (used > 0) {
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int u = used;
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int n = elts.length;
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for (int i = 0; i < n; i++) {
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long th = elts[i];
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if (th == 0)
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continue;
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if (th != -1)
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NativeThread.signal(th);
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if (--u == 0)
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break;
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}
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waitingToEmpty = true;
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try {
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wait(50);
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} catch (InterruptedException e) {
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interrupted = true;
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} finally {
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waitingToEmpty = false;
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}
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}
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if (interrupted)
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Thread.currentThread().interrupt();
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}
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}
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