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.misc;
27
28 import jdk.internal.vm.annotation.ForceInline;
29 import jdk.internal.misc.VM;
30 import jdk.internal.reflect.CallerSensitive;
31 import jdk.internal.reflect.Reflection;
32
33 import java.lang.reflect.Field;
34 import java.security.ProtectionDomain;
35
36
37 /**
38 * A collection of methods for performing low-level, unsafe operations.
39 * Although the class and all methods are public, use of this class is
40 * limited because only trusted code can obtain instances of it.
41 *
42 * <em>Note:</em> It is the resposibility of the caller to make sure
43 * arguments are checked before methods of this class are
44 * called. While some rudimentary checks are performed on the input,
45 * the checks are best effort and when performance is an overriding
46 * priority, as when methods of this class are optimized by the
47 * runtime compiler, some or all checks (if any) may be elided. Hence,
48 * the caller must not rely on the checks and corresponding
49 * exceptions!
50 *
51 * @author John R. Rose
1210 * provide a StoreStore barrier also provide a LoadStore barrier for free.
1211 * @since 1.8
1212 */
1213 @ForceInline
1214 public void storeFence() {
1215 theInternalUnsafe.storeFence();
1216 }
1217
1218 /**
1219 * Ensures that loads and stores before the fence will not be reordered
1220 * with loads and stores after the fence. Implies the effects of both
1221 * loadFence() and storeFence(), and in addition, the effect of a StoreLoad
1222 * barrier.
1223 *
1224 * Corresponds to C11 atomic_thread_fence(memory_order_seq_cst).
1225 * @since 1.8
1226 */
1227 @ForceInline
1228 public void fullFence() {
1229 theInternalUnsafe.fullFence();
1230 }
1231 }
|
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.misc;
27
28 import jdk.internal.vm.annotation.ForceInline;
29 import jdk.internal.misc.VM;
30 import jdk.internal.ref.Cleaner;
31 import jdk.internal.reflect.CallerSensitive;
32 import jdk.internal.reflect.Reflection;
33 import sun.nio.ch.DirectBuffer;
34
35 import java.lang.reflect.Field;
36 import java.security.ProtectionDomain;
37
38
39 /**
40 * A collection of methods for performing low-level, unsafe operations.
41 * Although the class and all methods are public, use of this class is
42 * limited because only trusted code can obtain instances of it.
43 *
44 * <em>Note:</em> It is the resposibility of the caller to make sure
45 * arguments are checked before methods of this class are
46 * called. While some rudimentary checks are performed on the input,
47 * the checks are best effort and when performance is an overriding
48 * priority, as when methods of this class are optimized by the
49 * runtime compiler, some or all checks (if any) may be elided. Hence,
50 * the caller must not rely on the checks and corresponding
51 * exceptions!
52 *
53 * @author John R. Rose
1212 * provide a StoreStore barrier also provide a LoadStore barrier for free.
1213 * @since 1.8
1214 */
1215 @ForceInline
1216 public void storeFence() {
1217 theInternalUnsafe.storeFence();
1218 }
1219
1220 /**
1221 * Ensures that loads and stores before the fence will not be reordered
1222 * with loads and stores after the fence. Implies the effects of both
1223 * loadFence() and storeFence(), and in addition, the effect of a StoreLoad
1224 * barrier.
1225 *
1226 * Corresponds to C11 atomic_thread_fence(memory_order_seq_cst).
1227 * @since 1.8
1228 */
1229 @ForceInline
1230 public void fullFence() {
1231 theInternalUnsafe.fullFence();
1232 }
1233
1234 /**
1235 * Invokes the given direct byte buffer's cleaner, if any.
1236 *
1237 * @param directBuffer a direct byte buffer
1238 * @throws NullPointerException if {@code directBuffer} is null
1239 * @throws IllegalArgumentException if {@code directBuffer} is non-direct,
1240 * or is a {@link java.nio.Buffer#slice slice}, or is a
1241 * {@link java.nio.Buffer#duplicate duplicate}
1242 * @since 9
1243 */
1244 public void invokeCleaner(java.nio.ByteBuffer directBuffer) {
1245 if (!directBuffer.isDirect())
1246 throw new IllegalArgumentException("buffer is non-direct");
1247
1248 DirectBuffer db = (DirectBuffer)directBuffer;
1249 if (db.attachment() != null)
1250 throw new IllegalArgumentException("duplicate or slice");
1251
1252 Cleaner cleaner = db.cleaner();
1253 if (cleaner != null) {
1254 cleaner.clean();
1255 }
1256 }
1257 }
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