* * <p>This method determines a block's base address by means of two parameters, * and so it provides (in effect) a <em>double-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. When the object reference is null, * the offset supplies an absolute base address. * * <p>The stores are in coherent (atomic) units of a size determined * by the address and length parameters. If the effective address and * length are all even modulo 8, the stores take place in 'long' units. * If the effective address and length are (resp.) even modulo 4 or 2, * the stores take place in units of 'int' or 'short'. * * @since 1.7 */ public native void setMemory(Object o, long offset, long bytes, byte value); /** * Sets all bytes in a given block of memory to a fixed value * (usually zero). This provides a <em>single-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. * * <p>Equivalent to <code>setMemory(null, address, bytes, value)</code>. */ public void setMemory(long address, long bytes, byte value) { setMemory(null, address, bytes, value); } /** * Sets all bytes in a given block of memory to a copy of another * block. * * <p>This method determines each block's base address by means of two parameters, * and so it provides (in effect) a <em>double-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. When the object reference is null, * the offset supplies an absolute base address. * * <p>The transfers are in coherent (atomic) units of a size determined * by the address and length parameters. If the effective addresses and * length are all even modulo 8, the transfer takes place in 'long' units. * If the effective addresses and length are (resp.) even modulo 4 or 2, * the transfer takes place in units of 'int' or 'short'. * * @since 1.7 */ public native void copyMemory(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes); /** * Sets all bytes in a given block of memory to a copy of another * block. This provides a <em>single-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. * * Equivalent to <code>copyMemory(null, srcAddress, null, destAddress, bytes)</code>. */ public void copyMemory(long srcAddress, long destAddress, long bytes) { copyMemory(null, srcAddress, null, destAddress, bytes); } /** * Disposes of a block of native memory, as obtained from {@link * #allocateMemory} or {@link #reallocateMemory}. The address passed to * this method may be null, in which case no action is taken. * * @see #allocateMemory */ public native void freeMemory(long address); /// random queries /** * This constant differs from all results that will ever be returned from * {@link #staticFieldOffset}, {@link #objectFieldOffset}, * or {@link #arrayBaseOffset}. */ public static final int INVALID_FIELD_OFFSET = -1; /** * Returns the offset of a field, truncated to 32 bits. * This method is implemented as follows: * <blockquote><pre> * public int fieldOffset(Field f) { * if (Modifier.isStatic(f.getModifiers())) * return (int) staticFieldOffset(f); * else * return (int) objectFieldOffset(f); * } * </pre></blockquote> * @deprecated As of 1.4.1, use {@link #staticFieldOffset} for static * fields and {@link #objectFieldOffset} for non-static fields. */ @Deprecated public int fieldOffset(Field f) { if (Modifier.isStatic(f.getModifiers())) return (int) staticFieldOffset(f); else return (int) objectFieldOffset(f); } /** * Returns the base address for accessing some static field * in the given class. This method is implemented as follows: * <blockquote><pre> * public Object staticFieldBase(Class c) { * Field[] fields = c.getDeclaredFields(); * for (int i = 0; i < fields.length; i++) { * if (Modifier.isStatic(fields[i].getModifiers())) { * return staticFieldBase(fields[i]); * } * } * return null; * } * </pre></blockquote> * @deprecated As of 1.4.1, use {@link #staticFieldBase(Field)} * to obtain the base pertaining to a specific {@link Field}. * This method works only for JVMs which store all statics * for a given class in one place. */ @Deprecated public Object staticFieldBase(Class c) { Field[] fields = c.getDeclaredFields(); for (int i = 0; i < fields.length; i++) { if (Modifier.isStatic(fields[i].getModifiers())) { return staticFieldBase(fields[i]); } } return null; } /** * Report the location of a given field in the storage allocation of its * class. Do not expect to perform any sort of arithmetic on this offset; * it is just a cookie which is passed to the unsafe heap memory accessors. * * <p>Any given field will always have the same offset and base, and no * two distinct fields of the same class will ever have the same offset * and base. * * <p>As of 1.4.1, offsets for fields are represented as long values, * although the Sun JVM does not use the most significant 32 bits. * However, JVM implementations which store static fields at absolute * addresses can use long offsets and null base pointers to express * the field locations in a form usable by {@link #getInt(Object,long)}. * Therefore, code which will be ported to such JVMs on 64-bit platforms * must preserve all bits of static field offsets. * @see #getInt(Object, long) */ public native long staticFieldOffset(Field f); /** * Report the location of a given static field, in conjunction with {@link * #staticFieldBase}. * <p>Do not expect to perform any sort of arithmetic on this offset; * it is just a cookie which is passed to the unsafe heap memory accessors. * * <p>Any given field will always have the same offset, and no two distinct * fields of the same class will ever have the same offset. * * <p>As of 1.4.1, offsets for fields are represented as long values, * although the Sun JVM does not use the most significant 32 bits. * It is hard to imagine a JVM technology which needs more than * a few bits to encode an offset within a non-array object, * However, for consistency with other methods in this class, * this method reports its result as a long value. * @see #getInt(Object, long) */ public native long objectFieldOffset(Field f); /** * Report the location of a given static field, in conjunction with {@link * #staticFieldOffset}. * <p>Fetch the base "Object", if any, with which static fields of the * given class can be accessed via methods like {@link #getInt(Object, * long)}. This value may be null. This value may refer to an object * which is a "cookie", not guaranteed to be a real Object, and it should * not be used in any way except as argument to the get and put routines in * this class. */ public native Object staticFieldBase(Field f); /** * Ensure the given class has been initialized. This is often * needed in conjunction with obtaining the static field base of a * class. */ public native void ensureClassInitialized(Class c); /** * Report the offset of the first element in the storage allocation of a * given array class. If {@link #arrayIndexScale} returns a non-zero value * for the same class, you may use that scale factor, together with this * base offset, to form new offsets to access elements of arrays of the * given class. * * @see #getInt(Object, long) * @see #putInt(Object, long, int) */ public native int arrayBaseOffset(Class arrayClass); /** The value of {@code arrayBaseOffset(boolean[].class)} */ public static final int ARRAY_BOOLEAN_BASE_OFFSET = theUnsafe.arrayBaseOffset(boolean[].class); /** The value of {@code arrayBaseOffset(byte[].class)} */ public static final int ARRAY_BYTE_BASE_OFFSET = theUnsafe.arrayBaseOffset(byte[].class); /** The value of {@code arrayBaseOffset(short[].class)} */ public static final int ARRAY_SHORT_BASE_OFFSET = theUnsafe.arrayBaseOffset(short[].class); /** The value of {@code arrayBaseOffset(char[].class)} */ public static final int ARRAY_CHAR_BASE_OFFSET = theUnsafe.arrayBaseOffset(char[].class); /** The value of {@code arrayBaseOffset(int[].class)} */ public static final int ARRAY_INT_BASE_OFFSET = theUnsafe.arrayBaseOffset(int[].class); /** The value of {@code arrayBaseOffset(long[].class)} */ public static final int ARRAY_LONG_BASE_OFFSET = theUnsafe.arrayBaseOffset(long[].class); /** The value of {@code arrayBaseOffset(float[].class)} */ public static final int ARRAY_FLOAT_BASE_OFFSET = theUnsafe.arrayBaseOffset(float[].class); /** The value of {@code arrayBaseOffset(double[].class)} */ public static final int ARRAY_DOUBLE_BASE_OFFSET = theUnsafe.arrayBaseOffset(double[].class); /** The value of {@code arrayBaseOffset(Object[].class)} */ public static final int ARRAY_OBJECT_BASE_OFFSET = theUnsafe.arrayBaseOffset(Object[].class); /** * Report the scale factor for addressing elements in the storage * allocation of a given array class. However, arrays of "narrow" types * will generally not work properly with accessors like {@link * #getByte(Object, int)}, so the scale factor for such classes is reported * as zero. * * @see #arrayBaseOffset * @see #getInt(Object, long) * @see #putInt(Object, long, int) */ public native int arrayIndexScale(Class arrayClass); /** The value of {@code arrayIndexScale(boolean[].class)} */ public static final int ARRAY_BOOLEAN_INDEX_SCALE = theUnsafe.arrayIndexScale(boolean[].class); /** The value of {@code arrayIndexScale(byte[].class)} */ public static final int ARRAY_BYTE_INDEX_SCALE = theUnsafe.arrayIndexScale(byte[].class); /** The value of {@code arrayIndexScale(short[].class)} */ public static final int ARRAY_SHORT_INDEX_SCALE = theUnsafe.arrayIndexScale(short[].class); /** The value of {@code arrayIndexScale(char[].class)} */ public static final int ARRAY_CHAR_INDEX_SCALE = theUnsafe.arrayIndexScale(char[].class); /** The value of {@code arrayIndexScale(int[].class)} */ public static final int ARRAY_INT_INDEX_SCALE = theUnsafe.arrayIndexScale(int[].class); /** The value of {@code arrayIndexScale(long[].class)} */ public static final int ARRAY_LONG_INDEX_SCALE = theUnsafe.arrayIndexScale(long[].class); /** The value of {@code arrayIndexScale(float[].class)} */ public static final int ARRAY_FLOAT_INDEX_SCALE = theUnsafe.arrayIndexScale(float[].class); /** The value of {@code arrayIndexScale(double[].class)} */ public static final int ARRAY_DOUBLE_INDEX_SCALE = theUnsafe.arrayIndexScale(double[].class); /** The value of {@code arrayIndexScale(Object[].class)} */ public static final int ARRAY_OBJECT_INDEX_SCALE = theUnsafe.arrayIndexScale(Object[].class); /** * Report the size in bytes of a native pointer, as stored via {@link * #putAddress}. This value will be either 4 or 8. Note that the sizes of * other primitive types (as stored in native memory blocks) is determined * fully by their information content. */ public native int addressSize(); /** The value of {@code addressSize()} */ public static final int ADDRESS_SIZE = theUnsafe.addressSize(); /** * Report the size in bytes of a native memory page (whatever that is). * This value will always be a power of two. */ public native int pageSize(); /// random trusted operations from JNI: /** * Tell the VM to define a class, without security checks. By default, the * class loader and protection domain come from the caller's class. */ public native Class defineClass(String name, byte[] b, int off, int len, ClassLoader loader, ProtectionDomain protectionDomain); public native Class defineClass(String name, byte[] b, int off, int len); /** * Define a class but do not make it known to the class loader or system dictionary. * <p> * For each CP entry, the corresponding CP patch must either be null or have * the a format that matches its tag: * <ul> * <li>Integer, Long, Float, Double: the corresponding wrapper object type from java.lang * <li>Utf8: a string (must have suitable syntax if used as signature or name) * <li>Class: any java.lang.Class object * <li>String: any object (not just a java.lang.String) * <li>InterfaceMethodRef: (NYI) a method handle to invoke on that call site's arguments * </ul> * @params hostClass context for linkage, access control, protection domain, and class loader * @params data bytes of a class file * @params cpPatches where non-null entries exist, they replace corresponding CP entries in data */ public native Class defineAnonymousClass(Class hostClass, byte[] data, Object[] cpPatches); /** Allocate an instance but do not run any constructor. Initializes the class if it has not yet been. */ public native Object allocateInstance(Class cls) throws InstantiationException; /** Lock the object. It must get unlocked via {@link #monitorExit}. */ public native void monitorEnter(Object o); /** * Unlock the object. It must have been locked via {@link * #monitorEnter}. */ public native void monitorExit(Object o); /** * Tries to lock the object. Returns true or false to indicate * whether the lock succeeded. If it did, the object must be * unlocked via {@link #monitorExit}. */ public native boolean tryMonitorEnter(Object o); /** Throw the exception without telling the verifier. */ public native void throwException(Throwable ee); /** * Atomically update Java variable to <tt>x</tt> if it is currently * holding <tt>expected</tt>. * @return <tt>true</tt> if successful */ public final native boolean compareAndSwapObject(Object o, long offset, Object expected, Object x); /** * Atomically update Java variable to <tt>x</tt> if it is currently * holding <tt>expected</tt>. * @return <tt>true</tt> if successful */ public final native boolean compareAndSwapInt(Object o, long offset, int expected, int x); /** * Atomically update Java variable to <tt>x</tt> if it is currently * holding <tt>expected</tt>. * @return <tt>true</tt> if successful */ public final native boolean compareAndSwapLong(Object o, long offset, long expected, long x); /** * Fetches a reference value from a given Java variable, with volatile * load semantics. Otherwise identical to {@link #getObject(Object, long)} */ public native Object getObjectVolatile(Object o, long offset); /** * Stores a reference value into a given Java variable, with * volatile store semantics. Otherwise identical to {@link #putObject(Object, long, Object)} */ public native void putObjectVolatile(Object o, long offset, Object x); /** Volatile version of {@link #getInt(Object, long)} */ public native int getIntVolatile(Object o, long offset); /** Volatile version of {@link #putInt(Object, long, int)} */ public native void putIntVolatile(Object o, long offset, int x); /** Volatile version of {@link #getBoolean(Object, long)} */ public native boolean getBooleanVolatile(Object o, long offset); /** Volatile version of {@link #putBoolean(Object, long, boolean)} */ public native void putBooleanVolatile(Object o, long offset, boolean x); /** Volatile version of {@link #getByte(Object, long)} */ public native byte getByteVolatile(Object o, long offset); /** Volatile version of {@link #putByte(Object, long, byte)} */ public native void putByteVolatile(Object o, long offset, byte x); /** Volatile version of {@link #getShort(Object, long)} */ public native short getShortVolatile(Object o, long offset); /** Volatile version of {@link #putShort(Object, long, short)} */ public native void putShortVolatile(Object o, long offset, short x); /** Volatile version of {@link #getChar(Object, long)} */ public native char getCharVolatile(Object o, long offset); /** Volatile version of {@link #putChar(Object, long, char)} */ public native void putCharVolatile(Object o, long offset, char x); /** Volatile version of {@link #getLong(Object, long)} */ public native long getLongVolatile(Object o, long offset); /** Volatile version of {@link #putLong(Object, long, long)} */ public native void putLongVolatile(Object o, long offset, long x); /** Volatile version of {@link #getFloat(Object, long)} */ public native float getFloatVolatile(Object o, long offset); /** Volatile version of {@link #putFloat(Object, long, float)} */ public native void putFloatVolatile(Object o, long offset, float x); /** Volatile version of {@link #getDouble(Object, long)} */ public native double getDoubleVolatile(Object o, long offset); /** Volatile version of {@link #putDouble(Object, long, double)} */ public native void putDoubleVolatile(Object o, long offset, double x); /** * Version of {@link #putObjectVolatile(Object, long, Object)} * that does not guarantee immediate visibility of the store to * other threads. This method is generally only useful if the * underlying field is a Java volatile (or if an array cell, one * that is otherwise only accessed using volatile accesses). */ public native void putOrderedObject(Object o, long offset, Object x); /** Ordered/Lazy version of {@link #putIntVolatile(Object, long, int)} */ public native void putOrderedInt(Object o, long offset, int x); /** Ordered/Lazy version of {@link #putLongVolatile(Object, long, long)} */ public native void putOrderedLong(Object o, long offset, long x); /** * Unblock the given thread blocked on <tt>park</tt>, or, if it is * not blocked, cause the subsequent call to <tt>park</tt> not to * block. Note: this operation is "unsafe" solely because the * caller must somehow ensure that the thread has not been * destroyed. Nothing special is usually required to ensure this * when called from Java (in which there will ordinarily be a live * reference to the thread) but this is not nearly-automatically * so when calling from native code. * @param thread the thread to unpark. * */ public native void unpark(Object thread); /** * Block current thread, returning when a balancing * <tt>unpark</tt> occurs, or a balancing <tt>unpark</tt> has * already occurred, or the thread is interrupted, or, if not * absolute and time is not zero, the given time nanoseconds have * elapsed, or if absolute, the given deadline in milliseconds * since Epoch has passed, or spuriously (i.e., returning for no * "reason"). Note: This operation is in the Unsafe class only * because <tt>unpark</tt> is, so it would be strange to place it * elsewhere. */ public native void park(boolean isAbsolute, long time); /** * Gets the load average in the system run queue assigned * to the available processors averaged over various periods of time. * This method retrieves the given <tt>nelem</tt> samples and * assigns to the elements of the given <tt>loadavg</tt> array. * The system imposes a maximum of 3 samples, representing * averages over the last 1, 5, and 15 minutes, respectively. * * @params loadavg an array of double of size nelems * @params nelems the number of samples to be retrieved and * must be 1 to 3. * * @return the number of samples actually retrieved; or -1 * if the load average is unobtainable.Lines 501–1000 of 1003. Previous lines Load more
* * <p>This method determines a block's base address by means of two parameters, * and so it provides (in effect) a <em>double-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. When the object reference is null, * the offset supplies an absolute base address. * * <p>The stores are in coherent (atomic) units of a size determined * by the address and length parameters. If the effective address and * length are all even modulo 8, the stores take place in 'long' units. * If the effective address and length are (resp.) even modulo 4 or 2, * the stores take place in units of 'int' or 'short'. * * @since 1.7 */ public native void setMemory(Object o, long offset, long bytes, byte value); /** * Sets all bytes in a given block of memory to a fixed value * (usually zero). This provides a <em>single-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. * * <p>Equivalent to <code>setMemory(null, address, bytes, value)</code>. */ public void setMemory(long address, long bytes, byte value) { setMemory(null, address, bytes, value); } /** * Sets all bytes in a given block of memory to a copy of another * block. * * <p>This method determines each block's base address by means of two parameters, * and so it provides (in effect) a <em>double-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. When the object reference is null, * the offset supplies an absolute base address. * * <p>The transfers are in coherent (atomic) units of a size determined * by the address and length parameters. If the effective addresses and * length are all even modulo 8, the transfer takes place in 'long' units. * If the effective addresses and length are (resp.) even modulo 4 or 2, * the transfer takes place in units of 'int' or 'short'. * * @since 1.7 */ public native void copyMemory(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes); /** * Sets all bytes in a given block of memory to a copy of another * block. This provides a <em>single-register</em> addressing mode, * as discussed in {@link #getInt(Object,long)}. * * Equivalent to <code>copyMemory(null, srcAddress, null, destAddress, bytes)</code>. */ public void copyMemory(long srcAddress, long destAddress, long bytes) { copyMemory(null, srcAddress, null, destAddress, bytes); } /** * Disposes of a block of native memory, as obtained from {@link * #allocateMemory} or {@link #reallocateMemory}. The address passed to * this method may be null, in which case no action is taken. * * @see #allocateMemory */ public native void freeMemory(long address); /// random queries /** * This constant differs from all results that will ever be returned from * {@link #staticFieldOffset}, {@link #objectFieldOffset}, * or {@link #arrayBaseOffset}. */ public static final int INVALID_FIELD_OFFSET = -1; /** * Returns the offset of a field, truncated to 32 bits. * This method is implemented as follows: * <blockquote><pre> * public int fieldOffset(Field f) { * if (Modifier.isStatic(f.getModifiers())) * return (int) staticFieldOffset(f); * else * return (int) objectFieldOffset(f); * } * </pre></blockquote> * @deprecated As of 1.4.1, use {@link #staticFieldOffset} for static * fields and {@link #objectFieldOffset} for non-static fields. */ @Deprecated public int fieldOffset(Field f) { if (Modifier.isStatic(f.getModifiers())) return (int) staticFieldOffset(f); else return (int) objectFieldOffset(f); } /** * Returns the base address for accessing some static field * in the given class. This method is implemented as follows: * <blockquote><pre> * public Object staticFieldBase(Class c) { * Field[] fields = c.getDeclaredFields(); * for (int i = 0; i < fields.length; i++) { * if (Modifier.isStatic(fields[i].getModifiers())) { * return staticFieldBase(fields[i]); * } * } * return null; * } * </pre></blockquote> * @deprecated As of 1.4.1, use {@link #staticFieldBase(Field)} * to obtain the base pertaining to a specific {@link Field}. * This method works only for JVMs which store all statics * for a given class in one place. */ @Deprecated public Object staticFieldBase(Class c) { Field[] fields = c.getDeclaredFields(); for (int i = 0; i < fields.length; i++) { if (Modifier.isStatic(fields[i].getModifiers())) { return staticFieldBase(fields[i]); } } return null; } /** * Report the location of a given field in the storage allocation of its * class. Do not expect to perform any sort of arithmetic on this offset; * it is just a cookie which is passed to the unsafe heap memory accessors. * * <p>Any given field will always have the same offset and base, and no * two distinct fields of the same class will ever have the same offset * and base. * * <p>As of 1.4.1, offsets for fields are represented as long values, * although the Sun JVM does not use the most significant 32 bits. * However, JVM implementations which store static fields at absolute * addresses can use long offsets and null base pointers to express * the field locations in a form usable by {@link #getInt(Object,long)}. * Therefore, code which will be ported to such JVMs on 64-bit platforms * must preserve all bits of static field offsets. * @see #getInt(Object, long) */ public native long staticFieldOffset(Field f); /** * Report the location of a given static field, in conjunction with {@link * #staticFieldBase}. * <p>Do not expect to perform any sort of arithmetic on this offset; * it is just a cookie which is passed to the unsafe heap memory accessors. * * <p>Any given field will always have the same offset, and no two distinct * fields of the same class will ever have the same offset. * * <p>As of 1.4.1, offsets for fields are represented as long values, * although the Sun JVM does not use the most significant 32 bits. * It is hard to imagine a JVM technology which needs more than * a few bits to encode an offset within a non-array object, * However, for consistency with other methods in this class, * this method reports its result as a long value. * @see #getInt(Object, long) */ public native long objectFieldOffset(Field f); /** * Report the location of a given static field, in conjunction with {@link * #staticFieldOffset}. * <p>Fetch the base "Object", if any, with which static fields of the * given class can be accessed via methods like {@link #getInt(Object, * long)}. This value may be null. This value may refer to an object * which is a "cookie", not guaranteed to be a real Object, and it should * not be used in any way except as argument to the get and put routines in * this class. */ public native Object staticFieldBase(Field f); /** * Ensure the given class has been initialized. This is often * needed in conjunction with obtaining the static field base of a * class. */ public native void ensureClassInitialized(Class c); /** * Report the offset of the first element in the storage allocation of a * given array class. If {@link #arrayIndexScale} returns a non-zero value * for the same class, you may use that scale factor, together with this * base offset, to form new offsets to access elements of arrays of the * given class. * * @see #getInt(Object, long) * @see #putInt(Object, long, int) */ public native int arrayBaseOffset(Class arrayClass); /** The value of {@code arrayBaseOffset(boolean[].class)} */ public static final int ARRAY_BOOLEAN_BASE_OFFSET = theUnsafe.arrayBaseOffset(boolean[].class); /** The value of {@code arrayBaseOffset(byte[].class)} */ public static final int ARRAY_BYTE_BASE_OFFSET = theUnsafe.arrayBaseOffset(byte[].class); /** The value of {@code arrayBaseOffset(short[].class)} */ public static final int ARRAY_SHORT_BASE_OFFSET = theUnsafe.arrayBaseOffset(short[].class); /** The value of {@code arrayBaseOffset(char[].class)} */ public static final int ARRAY_CHAR_BASE_OFFSET = theUnsafe.arrayBaseOffset(char[].class); /** The value of {@code arrayBaseOffset(int[].class)} */ public static final int ARRAY_INT_BASE_OFFSET = theUnsafe.arrayBaseOffset(int[].class); /** The value of {@code arrayBaseOffset(long[].class)} */ public static final int ARRAY_LONG_BASE_OFFSET = theUnsafe.arrayBaseOffset(long[].class); /** The value of {@code arrayBaseOffset(float[].class)} */ public static final int ARRAY_FLOAT_BASE_OFFSET = theUnsafe.arrayBaseOffset(float[].class); /** The value of {@code arrayBaseOffset(double[].class)} */ public static final int ARRAY_DOUBLE_BASE_OFFSET = theUnsafe.arrayBaseOffset(double[].class); /** The value of {@code arrayBaseOffset(Object[].class)} */ public static final int ARRAY_OBJECT_BASE_OFFSET = theUnsafe.arrayBaseOffset(Object[].class); /** * Report the scale factor for addressing elements in the storage * allocation of a given array class. However, arrays of "narrow" types * will generally not work properly with accessors like {@link * #getByte(Object, int)}, so the scale factor for such classes is reported * as zero. * * @see #arrayBaseOffset * @see #getInt(Object, long) * @see #putInt(Object, long, int) */ public native int arrayIndexScale(Class arrayClass); /** The value of {@code arrayIndexScale(boolean[].class)} */ public static final int ARRAY_BOOLEAN_INDEX_SCALE = theUnsafe.arrayIndexScale(boolean[].class); /** The value of {@code arrayIndexScale(byte[].class)} */ public static final int ARRAY_BYTE_INDEX_SCALE = theUnsafe.arrayIndexScale(byte[].class); /** The value of {@code arrayIndexScale(short[].class)} */ public static final int ARRAY_SHORT_INDEX_SCALE = theUnsafe.arrayIndexScale(short[].class); /** The value of {@code arrayIndexScale(char[].class)} */ public static final int ARRAY_CHAR_INDEX_SCALE = theUnsafe.arrayIndexScale(char[].class); /** The value of {@code arrayIndexScale(int[].class)} */ public static final int ARRAY_INT_INDEX_SCALE = theUnsafe.arrayIndexScale(int[].class); /** The value of {@code arrayIndexScale(long[].class)} */ public static final int ARRAY_LONG_INDEX_SCALE = theUnsafe.arrayIndexScale(long[].class); /** The value of {@code arrayIndexScale(float[].class)} */ public static final int ARRAY_FLOAT_INDEX_SCALE = theUnsafe.arrayIndexScale(float[].class); /** The value of {@code arrayIndexScale(double[].class)} */ public static final int ARRAY_DOUBLE_INDEX_SCALE = theUnsafe.arrayIndexScale(double[].class); /** The value of {@code arrayIndexScale(Object[].class)} */ public static final int ARRAY_OBJECT_INDEX_SCALE = theUnsafe.arrayIndexScale(Object[].class); /** * Report the size in bytes of a native pointer, as stored via {@link * #putAddress}. This value will be either 4 or 8. Note that the sizes of * other primitive types (as stored in native memory blocks) is determined * fully by their information content. */ public native int addressSize(); /** The value of {@code addressSize()} */ public static final int ADDRESS_SIZE = theUnsafe.addressSize(); /** * Report the size in bytes of a native memory page (whatever that is). * This value will always be a power of two. */ public native int pageSize(); /// random trusted operations from JNI: /** * Tell the VM to define a class, without security checks. By default, the * class loader and protection domain come from the caller's class. */ public native Class defineClass(String name, byte[] b, int off, int len, ClassLoader loader, ProtectionDomain protectionDomain); public native Class defineClass(String name, byte[] b, int off, int len); /** * Define a class but do not make it known to the class loader or system dictionary. * <p> * For each CP entry, the corresponding CP patch must either be null or have * the a format that matches its tag: * <ul> * <li>Integer, Long, Float, Double: the corresponding wrapper object type from java.lang * <li>Utf8: a string (must have suitable syntax if used as signature or name) * <li>Class: any java.lang.Class object * <li>String: any object (not just a java.lang.String) * <li>InterfaceMethodRef: (NYI) a method handle to invoke on that call site's arguments * </ul> * @params hostClass context for linkage, access control, protection domain, and class loader * @params data bytes of a class file * @params cpPatches where non-null entries exist, they replace corresponding CP entries in data */ public native Class defineAnonymousClass(Class hostClass, byte[] data, Object[] cpPatches); /** Allocate an instance but do not run any constructor. Initializes the class if it has not yet been. */ public native Object allocateInstance(Class cls) throws InstantiationException; /** Lock the object. It must get unlocked via {@link #monitorExit}. */ public native void monitorEnter(Object o); /** * Unlock the object. It must have been locked via {@link * #monitorEnter}. */ public native void monitorExit(Object o); /** * Tries to lock the object. Returns true or false to indicate * whether the lock succeeded. If it did, the object must be * unlocked via {@link #monitorExit}. */ public native boolean tryMonitorEnter(Object o); /** Throw the exception without telling the verifier. */ public native void throwException(Throwable ee); /** * Atomically update Java variable to <tt>x</tt> if it is currently * holding <tt>expected</tt>. * @return <tt>true</tt> if successful */ public final native boolean compareAndSwapObject(Object o, long offset, Object expected, Object x); /** * Atomically update Java variable to <tt>x</tt> if it is currently * holding <tt>expected</tt>. * @return <tt>true</tt> if successful */ public final native boolean compareAndSwapInt(Object o, long offset, int expected, int x); /** * Atomically update Java variable to <tt>x</tt> if it is currently * holding <tt>expected</tt>. * @return <tt>true</tt> if successful */ public final native boolean compareAndSwapLong(Object o, long offset, long expected, long x); /** * Fetches a reference value from a given Java variable, with volatile * load semantics. Otherwise identical to {@link #getObject(Object, long)} */ public native Object getObjectVolatile(Object o, long offset); /** * Stores a reference value into a given Java variable, with * volatile store semantics. Otherwise identical to {@link #putObject(Object, long, Object)} */ public native void putObjectVolatile(Object o, long offset, Object x); /** Volatile version of {@link #getInt(Object, long)} */ public native int getIntVolatile(Object o, long offset); /** Volatile version of {@link #putInt(Object, long, int)} */ public native void putIntVolatile(Object o, long offset, int x); /** Volatile version of {@link #getBoolean(Object, long)} */ public native boolean getBooleanVolatile(Object o, long offset); /** Volatile version of {@link #putBoolean(Object, long, boolean)} */ public native void putBooleanVolatile(Object o, long offset, boolean x); /** Volatile version of {@link #getByte(Object, long)} */ public native byte getByteVolatile(Object o, long offset); /** Volatile version of {@link #putByte(Object, long, byte)} */ public native void putByteVolatile(Object o, long offset, byte x); /** Volatile version of {@link #getShort(Object, long)} */ public native short getShortVolatile(Object o, long offset); /** Volatile version of {@link #putShort(Object, long, short)} */ public native void putShortVolatile(Object o, long offset, short x); /** Volatile version of {@link #getChar(Object, long)} */ public native char getCharVolatile(Object o, long offset); /** Volatile version of {@link #putChar(Object, long, char)} */ public native void putCharVolatile(Object o, long offset, char x); /** Volatile version of {@link #getLong(Object, long)} */ public native long getLongVolatile(Object o, long offset); /** Volatile version of {@link #putLong(Object, long, long)} */ public native void putLongVolatile(Object o, long offset, long x); /** Volatile version of {@link #getFloat(Object, long)} */ public native float getFloatVolatile(Object o, long offset); /** Volatile version of {@link #putFloat(Object, long, float)} */ public native void putFloatVolatile(Object o, long offset, float x); /** Volatile version of {@link #getDouble(Object, long)} */ public native double getDoubleVolatile(Object o, long offset); /** Volatile version of {@link #putDouble(Object, long, double)} */ public native void putDoubleVolatile(Object o, long offset, double x); /** * Version of {@link #putObjectVolatile(Object, long, Object)} * that does not guarantee immediate visibility of the store to * other threads. This method is generally only useful if the * underlying field is a Java volatile (or if an array cell, one * that is otherwise only accessed using volatile accesses). */ public native void putOrderedObject(Object o, long offset, Object x); /** Ordered/Lazy version of {@link #putIntVolatile(Object, long, int)} */ public native void putOrderedInt(Object o, long offset, int x); /** Ordered/Lazy version of {@link #putLongVolatile(Object, long, long)} */ public native void putOrderedLong(Object o, long offset, long x); /** * Unblock the given thread blocked on <tt>park</tt>, or, if it is * not blocked, cause the subsequent call to <tt>park</tt> not to * block. Note: this operation is "unsafe" solely because the * caller must somehow ensure that the thread has not been * destroyed. Nothing special is usually required to ensure this * when called from Java (in which there will ordinarily be a live * reference to the thread) but this is not nearly-automatically * so when calling from native code. * @param thread the thread to unpark. * */ public native void unpark(Object thread); /** * Block current thread, returning when a balancing * <tt>unpark</tt> occurs, or a balancing <tt>unpark</tt> has * already occurred, or the thread is interrupted, or, if not * absolute and time is not zero, the given time nanoseconds have * elapsed, or if absolute, the given deadline in milliseconds * since Epoch has passed, or spuriously (i.e., returning for no * "reason"). Note: This operation is in the Unsafe class only * because <tt>unpark</tt> is, so it would be strange to place it * elsewhere. */ public native void park(boolean isAbsolute, long time); /** * Gets the load average in the system run queue assigned * to the available processors averaged over various periods of time. * This method retrieves the given <tt>nelem</tt> samples and * assigns to the elements of the given <tt>loadavg</tt> array. * The system imposes a maximum of 3 samples, representing * averages over the last 1, 5, and 15 minutes, respectively. * * @params loadavg an array of double of size nelems * @params nelems the number of samples to be retrieved and * must be 1 to 3. * * @return the number of samples actually retrieved; or -1 * if the load average is unobtainable.