author | alanb |
Tue, 05 Feb 2019 18:53:19 +0000 | |
branch | niosocketimpl-branch |
changeset 57148 | 1a13164f3f4f |
parent 47216 | 71c04702a3d5 |
child 57301 | 66c3aaf31f2b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2013, 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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// Signalling operations on native threads |
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// |
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// On some operating systems (e.g., Linux), closing a channel while another |
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// thread is blocked in an I/O operation upon that channel does not cause that |
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// thread to be released. This class provides access to the native threads |
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// upon which Java threads are built, and defines a simple signal mechanism |
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// that can be used to release a native thread from a blocking I/O operation. |
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import jdk.internal.access.JavaLangAccess; |
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import jdk.internal.access.SharedSecrets; |
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public class NativeThread { |
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private static final JavaLangAccess JLA = SharedSecrets.getJavaLangAccess(); |
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/** |
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* Returns the current thread's ID. |
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*/ |
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public static long current() { |
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long tid = JLA.nativeTid(); |
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if (tid == 0) { |
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tid = current0(); |
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JLA.setNativeTid(tid); |
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} |
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return tid; |
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} |
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/** |
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* Signals the given thread. |
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*/ |
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public static void signal(long tid) { |
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signal0(tid); |
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} |
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private static native long current0(); |
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private static native void signal0(long tid); |
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private static native void init(); |
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static { |
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IOUtil.load(); |
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init(); |
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} |
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} |