8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28
29 // Signalling operations on native threads
30
31 public class NativeThread {
32 private static final long VIRTUAL_THREAD_ID = -1L;
33
34 /**
35 * Returns the id of the current native thread if the platform can signal
36 * native threads, 0 if the platform can not signal native threads, or
37 * -1L if the current thread is a virtual thread.
38 */
39 public static long current() {
40 if (Thread.currentThread().isVirtual()) {
41 return VIRTUAL_THREAD_ID;
42 } else {
43 // no support for signalling threads on Windows
44 return 0;
45 }
46 }
47
48 /**
49 * Signals the given native thread.
50 *
51 * @throws IllegalArgumentException if tid is not a token to a native thread
52 */
53 static void signal(long tid) {
54 throw new UnsupportedOperationException();
55 }
56
57 /**
58 * Returns true the tid is the id of a native thread.
59 */
60 static boolean isNativeThread(long tid) {
61 return false;
62 }
63
64 /**
65 * Returns true if tid is -1L.
66 * @see #current()
67 */
68 static boolean isVirtualThread(long tid) {
69 return (tid == VIRTUAL_THREAD_ID);
70 }
71 }
|
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.nio.ch;
27
28 import java.util.concurrent.locks.LockSupport;
29
30 public class NativeThread {
31 private NativeThread() { }
32
33 /**
34 * Returns the Thread to signal the current thread or {@code null} if the current
35 * thread cannot be signalled.
36 */
37 public static Thread threadToSignal() {
38 Thread thread = Thread.currentThread();
39 return thread.isVirtual() ? thread : null;
40 }
41
42 /**
43 * Signals the given thread.
44 * @throws UnsupportedOperationException is not supported
45 */
46 public static void signal(Thread thread) {
47 if (thread.isVirtual()) {
48 LockSupport.unpark(null);
49 } else {
50 throw new UnsupportedOperationException();
51 }
52 }
53 }
|