01: /*
02: * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
03: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04: *
05: * This code is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU General Public License version 2 only, as
07: * published by the Free Software Foundation. Sun designates this
08: * particular file as subject to the "Classpath" exception as provided
09: * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22: * CA 95054 USA or visit www.sun.com if you need additional information or
23: * have any questions.
24: */
25:
26: package sun.nio.ch;
27:
28: // Signalling operations on native threads
29: //
30: // On some operating systems (e.g., Linux), closing a channel while another
31: // thread is blocked in an I/O operation upon that channel does not cause that
32: // thread to be released. This class provides access to the native threads
33: // upon which Java threads are built, and defines a simple signal mechanism
34: // that can be used to release a native thread from a blocking I/O operation.
35: // On systems that do not require this type of signalling, the current() method
36: // always returns zero and the signal(long) method has no effect.
37:
38: class NativeThread {
39:
40: // Returns an opaque token representing the native thread underlying the
41: // invoking Java thread. On systems that do not require signalling, this
42: // method always returns zero.
43: //
44: static native long current();
45:
46: // Signals the given native thread so as to release it from a blocking I/O
47: // operation. On systems that do not require signalling, this method has
48: // no effect.
49: //
50: static native void signal(long nt);
51:
52: static native void init();
53:
54: static {
55: Util.load();
56: init();
57: }
58:
59: }
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