sun.misc

Class Unsafe

java.lang.Object

sun.misc.Unsafe

public class Unsafe
extends Object

Unsafe = unwanted. See comments in the native peer. We only have it because it is required by java.util.concurrent. Note that in the real world, this class is only callable from the system library, not application code

Field Summary

Fields

Modifier and Type	Field and Description
static int	INVALID_FIELD_OFFSET

Constructor Summary

Constructors

Constructor and Description
Unsafe()

Method Summary

Methods

Modifier and Type	Method and Description
long	allocateMemory(long bytes) this is really a byte[] allocation (used by java.nio.Bits).
int	arrayBaseOffset(Class<?> clazz)
int	arrayIndexScale(Class<?> clazz)
boolean	compareAndSwapInt(Object oThis, long offset, int expect, int update)
boolean	compareAndSwapLong(Object oThis, long offset, long expect, long update)
boolean	compareAndSwapObject(Object oThis, long offset, Object expect, Object update)
void	ensureClassInitialized(Class<?> cls)
int	fieldOffset(Field f)
void	freeMemory(long byteArrayRef) to be used to free allocateMemory() allocated array objects
boolean	getBoolean(Object obj, int offset) Deprecated.
boolean	getBoolean(Object obj, long l)
boolean	getBooleanVolatile(Object obj, long l)
byte	getByte(long address) byte access of allocateMemory() objects.
byte	getByte(Object obj, int offset) Deprecated.
byte	getByte(Object obj, long l)
byte	getByteVolatile(Object obj, long l)
char	getChar(long address)
char	getChar(Object obj, int offset) Deprecated.
char	getChar(Object obj, long l)
char	getCharVolatile(Object obj, long l)
double	getDouble(long address)
double	getDouble(Object obj, int offset) Deprecated.
double	getDouble(Object obj, long l)
double	getDoubleVolatile(Object obj, long l)
float	getFloat(long address)
float	getFloat(Object obj, int offset) Deprecated.
float	getFloat(Object obj, long l)
float	getFloatVolatile(Object obj, long l)
int	getInt(long address)
int	getInt(Object obj, int offset) Deprecated.
int	getInt(Object obj, long l)
int	getIntVolatile(Object obj, long l)
long	getLong(long address)
long	getLong(Object obj, int offset) Deprecated.
long	getLong(Object obj, long l)
long	getLongVolatile(Object obj, long l)
Object	getObject(Object obj, int offset) Deprecated.
Object	getObject(Object obj, long l)
Object	getObjectVolatile(Object obj, long l)
short	getShort(Object obj, int offset) Deprecated.
short	getShort(Object obj, long l)
short	getShortVolatile(Object obj, long l)
static Unsafe	getUnsafe()
long	objectFieldOffset(Field f)
void	park(boolean isAbsolute, long timeout)
void	putBoolean(Object obj, int offset, boolean flag) Deprecated.
void	putBoolean(Object obj, long l, boolean flag)
void	putBooleanVolatile(Object obj, long l, boolean flag)
void	putByte(long address, byte val)
void	putByte(Object obj, int offset, byte byte0) Deprecated.
void	putByte(Object obj, long l, byte byte0)
void	putByteVolatile(Object obj, long l, byte byte0)
void	putChar(long address, char val)
void	putChar(Object obj, int offset, char c) Deprecated.
void	putChar(Object obj, long l, char c)
void	putCharVolatile(Object obj, long l, char c)
void	putDouble(long address, double val)
void	putDouble(Object obj, int offset, double d) Deprecated.
void	putDouble(Object obj, long l, double d)
void	putDoubleVolatile(Object obj, long l, double d)
void	putFloat(long address, float val)
void	putFloat(Object obj, int offset, float f) Deprecated.
void	putFloat(Object obj, long l, float f)
void	putFloatVolatile(Object obj, long l, float f)
void	putInt(long address, int val)
void	putInt(Object obj, int offset, int i) Deprecated.
void	putInt(Object obj, long l, int i)
void	putIntVolatile(Object obj, long l, int i)
void	putLong(long address, long val)
void	putLong(Object obj, int offset, long l1) Deprecated.
void	putLong(Object obj, long l, long l1)
void	putLongVolatile(Object obj, long l, long l1)
void	putObject(Object obj, int offset, Object obj1) Deprecated.
void	putObject(Object obj, long l, Object obj1)
void	putObjectVolatile(Object obj, long l, Object obj1)
void	putOrderedInt(Object obj, long l, int i)
void	putOrderedLong(Object obj, long l, long l1)
void	putOrderedObject(Object obj, long l, Object obj1)
void	putShort(Object obj, int offset, short word0) Deprecated.
void	putShort(Object obj, long l, short word0)
void	putShortVolatile(Object obj, long l, short word0)
void	unpark(Object thread)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INVALID_FIELD_OFFSET

public static final int INVALID_FIELD_OFFSET

See Also:

Constant Field Values

Constructor Detail

Unsafe

public Unsafe()

Method Detail

getUnsafe

public static Unsafe getUnsafe()

fieldOffset

public int fieldOffset(Field f)

objectFieldOffset

public long objectFieldOffset(Field f)

compareAndSwapObject

public boolean compareAndSwapObject(Object oThis,
                           long offset,
                           Object expect,
                           Object update)

compareAndSwapInt

public boolean compareAndSwapInt(Object oThis,
                        long offset,
                        int expect,
                        int update)

compareAndSwapLong

public boolean compareAndSwapLong(Object oThis,
                         long offset,
                         long expect,
                         long update)

park

public void park(boolean isAbsolute,
        long timeout)

unpark

public void unpark(Object thread)

getInt

public int getInt(Object obj,
         long l)

getIntVolatile

public int getIntVolatile(Object obj,
                 long l)

getInt

@Deprecated
public int getInt(Object obj,
                    int offset)

Deprecated.

putInt

public void putInt(Object obj,
          long l,
          int i)

putIntVolatile

public void putIntVolatile(Object obj,
                  long l,
                  int i)

putInt

@Deprecated
public void putInt(Object obj,
                     int offset,
                     int i)

Deprecated.

putOrderedInt

public void putOrderedInt(Object obj,
                 long l,
                 int i)

getObject

public Object getObject(Object obj,
               long l)

getObjectVolatile

public Object getObjectVolatile(Object obj,
                       long l)

getObject

@Deprecated
public Object getObject(Object obj,
                          int offset)

Deprecated.

putObject

public void putObject(Object obj,
             long l,
             Object obj1)

putObjectVolatile

public void putObjectVolatile(Object obj,
                     long l,
                     Object obj1)

putObject

@Deprecated
public void putObject(Object obj,
                        int offset,
                        Object obj1)

Deprecated.

putOrderedObject

public void putOrderedObject(Object obj,
                    long l,
                    Object obj1)

getBoolean

public boolean getBoolean(Object obj,
                 long l)

getBooleanVolatile

public boolean getBooleanVolatile(Object obj,
                         long l)

getBoolean

@Deprecated
public boolean getBoolean(Object obj,
                            int offset)

Deprecated.

putBoolean

public void putBoolean(Object obj,
              long l,
              boolean flag)

putBooleanVolatile

public void putBooleanVolatile(Object obj,
                      long l,
                      boolean flag)

putBoolean

@Deprecated
public void putBoolean(Object obj,
                         int offset,
                         boolean flag)

Deprecated.

getByte

public byte getByte(Object obj,
           long l)

getByteVolatile

public byte getByteVolatile(Object obj,
                   long l)

getByte

@Deprecated
public byte getByte(Object obj,
                      int offset)

Deprecated.

putByte

public void putByte(Object obj,
           long l,
           byte byte0)

putByteVolatile

public void putByteVolatile(Object obj,
                   long l,
                   byte byte0)

putByte

@Deprecated
public void putByte(Object obj,
                      int offset,
                      byte byte0)

Deprecated.

getShort

public short getShort(Object obj,
             long l)

getShortVolatile

public short getShortVolatile(Object obj,
                     long l)

getShort

@Deprecated
public short getShort(Object obj,
                        int offset)

Deprecated.

putShort

public void putShort(Object obj,
            long l,
            short word0)

putShortVolatile

public void putShortVolatile(Object obj,
                    long l,
                    short word0)

putShort

@Deprecated
public void putShort(Object obj,
                       int offset,
                       short word0)

Deprecated.

getChar

public char getChar(Object obj,
           long l)

getCharVolatile

public char getCharVolatile(Object obj,
                   long l)

getChar

@Deprecated
public char getChar(Object obj,
                      int offset)

Deprecated.

putChar

public void putChar(Object obj,
           long l,
           char c)

putCharVolatile

public void putCharVolatile(Object obj,
                   long l,
                   char c)

putChar

@Deprecated
public void putChar(Object obj,
                      int offset,
                      char c)

Deprecated.

getLong

public long getLong(Object obj,
           long l)

getLongVolatile

public long getLongVolatile(Object obj,
                   long l)

getLong

@Deprecated
public long getLong(Object obj,
                      int offset)

Deprecated.

putLong

public void putLong(Object obj,
           long l,
           long l1)

putLongVolatile

public void putLongVolatile(Object obj,
                   long l,
                   long l1)

putOrderedLong

public void putOrderedLong(Object obj,
                  long l,
                  long l1)

putLong

@Deprecated
public void putLong(Object obj,
                      int offset,
                      long l1)

Deprecated.

getFloat

public float getFloat(Object obj,
             long l)

getFloatVolatile

public float getFloatVolatile(Object obj,
                     long l)

getFloat

@Deprecated
public float getFloat(Object obj,
                        int offset)

Deprecated.

putFloat

public void putFloat(Object obj,
            long l,
            float f)

putFloatVolatile

public void putFloatVolatile(Object obj,
                    long l,
                    float f)

putFloat

@Deprecated
public void putFloat(Object obj,
                       int offset,
                       float f)

Deprecated.

getDouble

public double getDouble(Object obj,
               long l)

getDoubleVolatile

public double getDoubleVolatile(Object obj,
                       long l)

getDouble

@Deprecated
public double getDouble(Object obj,
                          int offset)

Deprecated.

putDouble

public void putDouble(Object obj,
             long l,
             double d)

putDoubleVolatile

public void putDoubleVolatile(Object obj,
                     long l,
                     double d)

putDouble

@Deprecated
public void putDouble(Object obj,
                        int offset,
                        double d)

Deprecated.

ensureClassInitialized

public void ensureClassInitialized(Class<?> cls)

arrayBaseOffset

public int arrayBaseOffset(Class<?> clazz)

arrayIndexScale

public int arrayIndexScale(Class<?> clazz)

allocateMemory

public long allocateMemory(long bytes)

this is really a byte[] allocation (used by java.nio.Bits). Note that object has to be explicitly freed with freeMemory() (yikes!)

freeMemory

public void freeMemory(long byteArrayRef)

to be used to free allocateMemory() allocated array objects

getByte

public byte getByte(long address)

byte access of allocateMemory() objects. Note that 'address' has to point into such an object

putByte

public void putByte(long address,
           byte val)

getChar

public char getChar(long address)

putChar

public void putChar(long address,
           char val)

getInt

public int getInt(long address)

putInt

public void putInt(long address,
          int val)

getLong

public long getLong(long address)

putLong

public void putLong(long address,
           long val)

getFloat

public float getFloat(long address)

putFloat

public void putFloat(long address,
            float val)

getDouble

public double getDouble(long address)

putDouble

public void putDouble(long address,
             double val)