/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * particular file as subject to the "Classpath" exception as provided

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

package sun.nio.ch;

// Signalling operations on native threads

//

// On some operating systems (e.g., Linux), closing a channel while another

// thread is blocked in an I/O operation upon that channel does not cause that

// thread to be released.  This class provides access to the native threads

// upon which Java threads are built, and defines a simple signal mechanism

// that can be used to release a native thread from a blocking I/O operation.

// On systems that do not require this type of signalling, the current() method

// always returns -1 and the signal(long) method has no effect.

class NativeThread {

    // Returns an opaque token representing the native thread underlying the

    // invoking Java thread.  On systems that do not require signalling, this

    // method always returns -1.

    //

    static native long current();

    // Signals the given native thread so as to release it from a blocking I/O

    // operation.  On systems that do not require signalling, this method has

    // no effect.

    //

    static native void signal(long nt);

    static native void init();

    static {

        Util.load();

        init();

    }

}