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 jdk.internal.misc;
27
28 import static java.lang.Thread.State.*;
29 import java.util.Properties;
30
31 public class VM {
32
33 // the init level when the VM is fully initialized
34 private static final int JAVA_LANG_SYSTEM_INITED = 1;
35 private static final int MODULE_SYSTEM_INITED = 2;
36 private static final int SYSTEM_LOADER_INITIALIZING = 3;
37 private static final int SYSTEM_BOOTED = 4;
38
39 // 0, 1, 2, ...
40 private static volatile int initLevel;
41 private static final Object lock = new Object();
42
43 /**
44 * Sets the init level.
45 *
46 * @see java.lang.System#initPhase1
47 * @see java.lang.System#initPhase2
48 * @see java.lang.System#initPhase3
49 */
115 private static boolean pageAlignDirectMemory;
116
117 // Returns {@code true} if the direct buffers should be page aligned. This
118 // variable is initialized by saveAndRemoveProperties.
119 public static boolean isDirectMemoryPageAligned() {
120 return pageAlignDirectMemory;
121 }
122
123 /**
124 * Returns true if the given class loader is in the system domain
125 * in which all permissions are granted.
126 */
127 public static boolean isSystemDomainLoader(ClassLoader loader) {
128 return loader == null;
129 }
130
131 /**
132 * Returns the system property of the specified key saved at
133 * system initialization time. This method should only be used
134 * for the system properties that are not changed during runtime.
135 * It accesses a private copy of the system properties so
136 * that user's locking of the system properties object will not
137 * cause the library to deadlock.
138 *
139 * Note that the saved system properties do not include
140 * the ones set by sun.misc.Version.init().
141 *
142 */
143 public static String getSavedProperty(String key) {
144 if (savedProps.isEmpty())
145 throw new IllegalStateException("Should be non-empty if initialized");
146
147 return savedProps.getProperty(key);
148 }
149
150 // TODO: the Property Management needs to be refactored and
151 // the appropriate prop keys need to be accessible to the
152 // calling classes to avoid duplication of keys.
153 private static final Properties savedProps = new Properties();
154
155 // Save a private copy of the system properties and remove
156 // the system properties that are not intended for public access.
157 //
158 // This method can only be invoked during system initialization.
159 public static void saveAndRemoveProperties(Properties props) {
160 if (initLevel() != 0)
161 throw new IllegalStateException("Wrong init level");
162
163 savedProps.putAll(props);
164
165 // Set the maximum amount of direct memory. This value is controlled
166 // by the vm option -XX:MaxDirectMemorySize=<size>.
167 // The maximum amount of allocatable direct buffer memory (in bytes)
168 // from the system property sun.nio.MaxDirectMemorySize set by the VM.
169 // The system property will be removed.
170 String s = (String)props.remove("sun.nio.MaxDirectMemorySize");
171 if (s != null) {
172 if (s.equals("-1")) {
173 // -XX:MaxDirectMemorySize not given, take default
174 directMemory = Runtime.getRuntime().maxMemory();
175 } else {
176 long l = Long.parseLong(s);
177 if (l > -1)
178 directMemory = l;
179 }
180 }
181
182 // Check if direct buffers should be page aligned
183 s = (String)props.remove("sun.nio.PageAlignDirectMemory");
|
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 jdk.internal.misc;
27
28 import static java.lang.Thread.State.*;
29 import java.util.Map;
30 import java.util.HashMap;
31 import java.util.Properties;
32 import java.util.Collections;
33
34 public class VM {
35
36 // the init level when the VM is fully initialized
37 private static final int JAVA_LANG_SYSTEM_INITED = 1;
38 private static final int MODULE_SYSTEM_INITED = 2;
39 private static final int SYSTEM_LOADER_INITIALIZING = 3;
40 private static final int SYSTEM_BOOTED = 4;
41
42 // 0, 1, 2, ...
43 private static volatile int initLevel;
44 private static final Object lock = new Object();
45
46 /**
47 * Sets the init level.
48 *
49 * @see java.lang.System#initPhase1
50 * @see java.lang.System#initPhase2
51 * @see java.lang.System#initPhase3
52 */
118 private static boolean pageAlignDirectMemory;
119
120 // Returns {@code true} if the direct buffers should be page aligned. This
121 // variable is initialized by saveAndRemoveProperties.
122 public static boolean isDirectMemoryPageAligned() {
123 return pageAlignDirectMemory;
124 }
125
126 /**
127 * Returns true if the given class loader is in the system domain
128 * in which all permissions are granted.
129 */
130 public static boolean isSystemDomainLoader(ClassLoader loader) {
131 return loader == null;
132 }
133
134 /**
135 * Returns the system property of the specified key saved at
136 * system initialization time. This method should only be used
137 * for the system properties that are not changed during runtime.
138 *
139 * Note that the saved system properties do not include
140 * the ones set by java.lang.VersionProps.init().
141 */
142 public static String getSavedProperty(String key) {
143 if (savedProps == null)
144 throw new IllegalStateException("Not yet initialized");
145
146 return savedProps.get(key);
147 }
148
149 /**
150 * Gets an unmodifiable view of the system properties saved at system
151 * initialization time. This method should only be used
152 * for the system properties that are not changed during runtime.
153 *
154 * Note that the saved system properties do not include
155 * the ones set by java.lang.VersionProps.init().
156 */
157 public static Map<String, String> getSavedProperties() {
158 if (savedProps == null)
159 throw new IllegalStateException("Not yet initialized");
160
161 return savedProps;
162 }
163
164 private static Map<String, String> savedProps;
165
166 // Save a private copy of the system properties and remove
167 // the system properties that are not intended for public access.
168 //
169 // This method can only be invoked during system initialization.
170 public static void saveAndRemoveProperties(Properties props) {
171 if (initLevel() != 0)
172 throw new IllegalStateException("Wrong init level");
173
174 @SuppressWarnings({"rawtypes", "unchecked"})
175 Map<String, String> sp =
176 Map.ofEntries(props.entrySet().toArray(new Map.Entry[0]));
177 // only main thread is running at this time, so savedProps and
178 // its content will be correctly published to threads started later
179 savedProps = sp;
180
181 // Set the maximum amount of direct memory. This value is controlled
182 // by the vm option -XX:MaxDirectMemorySize=<size>.
183 // The maximum amount of allocatable direct buffer memory (in bytes)
184 // from the system property sun.nio.MaxDirectMemorySize set by the VM.
185 // The system property will be removed.
186 String s = (String)props.remove("sun.nio.MaxDirectMemorySize");
187 if (s != null) {
188 if (s.equals("-1")) {
189 // -XX:MaxDirectMemorySize not given, take default
190 directMemory = Runtime.getRuntime().maxMemory();
191 } else {
192 long l = Long.parseLong(s);
193 if (l > -1)
194 directMemory = l;
195 }
196 }
197
198 // Check if direct buffers should be page aligned
199 s = (String)props.remove("sun.nio.PageAlignDirectMemory");
|