| java.lang.Object
 sun.misc.Unsafe
| Unsafe | | public class Unsafe (Code) | | The Unsafe service.
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| Method Summary | |
| public int | arrayBaseOffset(Class clazz)
Retrieves the base offset for the array Class given. | | public int | arrayIndexScale(Class clazz)
Retrieves the array index scale for the array Class given. | | public boolean | compareAndSwapInt(Object object, long fieldOffset, int expected, int update)
Compares and swaps the value of an int-typed field on an Object instance.
Parameters:
object - The instance containing the field.
Parameters:
fieldOffset - The offset value of the field.
Parameters:
expected - The expected value of the field.
Parameters:
update - The new value to write to the field. | | public boolean | compareAndSwapLong(Object object, long fieldOffset, long expected, long update)
Compares and swaps the value of a long-typed field on an Object instance.
Parameters:
object - The instance containing the field.
Parameters:
fieldOffset - The offset value of the field.
Parameters:
expected - The expected value of the field.
Parameters:
update - The new value to write to the field. | | public boolean | compareAndSwapObject(Object object, long fieldOffset, Object expected, Object update)
Compares and swaps the value of an Object-typed field on an Object
instance.
Parameters:
object - The instance containing the field.
Parameters:
fieldOffset - The offset value of the field.
Parameters:
expected - The expected value of the field.
Parameters:
update - The new value to write to the field. | | public int | getIntVolatile(Object object, long fieldOffset)
Reads an int value from an Object's field as though it were declared
volatile.
Parameters:
object - The instance containing the field to read from.
Parameters:
fieldOffset - The offset of the field to read from. | | public long | getLong(Object object, long fieldOffset)
Reads a long value from an Object's field.
Parameters:
object - The instance containing the field to read from.
Parameters:
fieldOffset - The offset of the field to read from. | | public long | getLongVolatile(Object object, long fieldOffset)
Reads a long value from an Object's field as though it were declared
volatile.
Parameters:
object - The instance containing the field to read from.
Parameters:
fieldOffset - The offset of the field to read from. | | public Object | getObjectVolatile(Object object, long fieldOffset)
Writes an int value to an Object's field as though it were declared
volatile. | | public static Unsafe | getUnsafe()
Retrieves an instance of this service. | | public long | objectFieldOffset(Field field)
Retrieves the offset value of the
Field for use by other methods
in this class.
Parameters:
field - The Field to retrieve the offset for. | | public void | park(boolean timestamp, long nanosOrTimestamp)
Parks the
Thread.currentThread current thread either for a set
number of nanoseconds or until a future point in time.
Parameters:
timestamp - If true nanosOrTimestampshould be consider as a timestamp based onSystem.currentTimeMillis. | | public void | putIntVolatile(Object object, long fieldOffset, int newValue)
Writes an int value to an Object's field as though it were declared
volatile. | | public void | putLong(Object object, long fieldOffset, long newValue)
Writes a long value to an Object's field. | | public void | putLongVolatile(Object object, long fieldOffset, long newValue)
Writes a long value to an Object's field as though it were declared
volatile. | | public void | putObjectVolatile(Object object, long fieldOffset, Object newValue)
Writes an Object reference value to an Object's field as though it were
declared volatile. | | public void | unpark(Thread thread)
Unparks the
Thread that's passed. |
| arrayBaseOffset | | public int arrayBaseOffset(Class clazz)(Code) | |
Retrieves the base offset for the array Class given. The Class passed
MUST me any array type, such that the method
Class.isArray returns true. For example, int[].class.
Parameters:
clazz - The array Class object. The base offset value. |
| arrayIndexScale | | public int arrayIndexScale(Class clazz)(Code) | |
Retrieves the array index scale for the array Class given. The index
scale is the value used to determine the offset of a particular element
in the array given the array's base offset and an index. The following
code snippet illustrates the usage.
int base = unsafe.arrayBaseOffset(int[].class);
int scale = unsafe.arrayIndexScale(int[].class);
int elementIdx = 1;
int[] array = { 0, 1, 2 };
long offsetForIdx = base + (elementIdx * scale);
The Class passed MUST me any array type, such that the method
Class.isArray returns true. For example,
int[].class.
Parameters:
clazz - The array Class object. The index scale value. |
| compareAndSwapInt | | public boolean compareAndSwapInt(Object object, long fieldOffset, int expected, int update)(Code) | |
Compares and swaps the value of an int-typed field on an Object instance.
Parameters:
object - The instance containing the field.
Parameters:
fieldOffset - The offset value of the field.
Parameters:
expected - The expected value of the field.
Parameters:
update - The new value to write to the field. true if the field was updated, falseotherwise. |
| compareAndSwapLong | | public boolean compareAndSwapLong(Object object, long fieldOffset, long expected, long update)(Code) | |
Compares and swaps the value of a long-typed field on an Object instance.
Parameters:
object - The instance containing the field.
Parameters:
fieldOffset - The offset value of the field.
Parameters:
expected - The expected value of the field.
Parameters:
update - The new value to write to the field. true if the field was updated, falseotherwise. |
| compareAndSwapObject | | public boolean compareAndSwapObject(Object object, long fieldOffset, Object expected, Object update)(Code) | |
Compares and swaps the value of an Object-typed field on an Object
instance.
Parameters:
object - The instance containing the field.
Parameters:
fieldOffset - The offset value of the field.
Parameters:
expected - The expected value of the field.
Parameters:
update - The new value to write to the field. true if the field was updated, falseotherwise. |
| getIntVolatile | | public int getIntVolatile(Object object, long fieldOffset)(Code) | |
Reads an int value from an Object's field as though it were declared
volatile.
Parameters:
object - The instance containing the field to read from.
Parameters:
fieldOffset - The offset of the field to read from. The value that was read. |
| getLong | | public long getLong(Object object, long fieldOffset)(Code) | |
Reads a long value from an Object's field.
Parameters:
object - The instance containing the field to read from.
Parameters:
fieldOffset - The offset of the field to read from. The value that was read. |
| getLongVolatile | | public long getLongVolatile(Object object, long fieldOffset)(Code) | |
Reads a long value from an Object's field as though it were declared
volatile.
Parameters:
object - The instance containing the field to read from.
Parameters:
fieldOffset - The offset of the field to read from. The value that was read. |
| getObjectVolatile | | public Object getObjectVolatile(Object object, long fieldOffset)(Code) | |
Writes an int value to an Object's field as though it were declared
volatile.
Parameters:
object - The instance containing the field to write to.
Parameters:
fieldOffset - The offset of the field to write to.
Parameters:
newValue - The value to write. |
| getUnsafe | | public static Unsafe getUnsafe()(Code) | |
Retrieves an instance of this service.
An instance of Unsafe. |
| objectFieldOffset | | public long objectFieldOffset(Field field)(Code) | |
Retrieves the offset value of the
Field for use by other methods
in this class.
Parameters:
field - The Field to retrieve the offset for. The offset value. |
| park | | public void park(boolean timestamp, long nanosOrTimestamp)(Code) | |
Parks the
Thread.currentThread current thread either for a set
number of nanoseconds or until a future point in time.
Parameters:
timestamp - If true nanosOrTimestampshould be consider as a timestamp based onSystem.currentTimeMillis. If false,then nanosOrTimestamp should be considered as arelative number of nanoseconds from when this method was called;the value 0L can be used in conjunction with thisto indicate that time is not a factor when parking the thread.
Parameters:
nanosOrTimestamp - Either a relative number of nanoseconds or atimestamp in milliseconds as defined bySystem.currentTimeMillis. |
| putIntVolatile | | public void putIntVolatile(Object object, long fieldOffset, int newValue)(Code) | |
Writes an int value to an Object's field as though it were declared
volatile.
Parameters:
object - The instance containing the field to write to.
Parameters:
fieldOffset - The offset of the field to write to.
Parameters:
newValue - The value to write. |
| putLong | | public void putLong(Object object, long fieldOffset, long newValue)(Code) | |
Writes a long value to an Object's field.
Parameters:
object - The instance containing the field to write to.
Parameters:
fieldOffset - The offset of the field to write to.
Parameters:
newValue - The value to write. |
| putLongVolatile | | public void putLongVolatile(Object object, long fieldOffset, long newValue)(Code) | |
Writes a long value to an Object's field as though it were declared
volatile.
Parameters:
object - The instance containing the field to write to.
Parameters:
fieldOffset - The offset of the field to write to.
Parameters:
newValue - The value to write. |
| putObjectVolatile | | public void putObjectVolatile(Object object, long fieldOffset, Object newValue)(Code) | |
Writes an Object reference value to an Object's field as though it were
declared volatile.
Parameters:
object - The instance containing the field to write to.
Parameters:
fieldOffset - The offset of the field to write to.
Parameters:
newValue - The value to write. |
| unpark | | public void unpark(Thread thread)(Code) | |
Unparks the
Thread that's passed.
Parameters:
thread - The Thread to unpark. |
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