net.dongliu.direct.utils

类 U

java.lang.Object

net.dongliu.direct.utils.U

public class U
extends Object

Wrapper Unsafe Operations.

作者:

dongliu

构造器概要

构造器

构造器和说明
U()

方法概要

限定符和类型	方法和说明
static long	allocateMemory(long size) Allocates a new block of native memory, of the given size in bytes.
static boolean	compareAndSwapInt(Object o, long offset, int expect, int value) cas operation for int Field.
static boolean	compareAndSwapLong(Object o, long offset, long expect, long value) cas operation for long Field.
static boolean	compareAndSwapObject(Object o, long offset, Object expect, Object value) cas operation for Object Field.
static void	freeMemory(long l) Disposes of a block of native memory, as obtained from #allocateMemory or #reallocateMemory .
static byte	getByte(long pos)
static long	objectFieldOffset(Class klass, String field) Get class field offset
static void	read(long address, byte[] src, int offset, int size) read bytes from unsafe memory.
static long	reallocateMemory(long address, long size) Resizes a new block of native memory, to the given size in bytes.
static void	write(long address, byte[] src, int offset, int size) write bytes to unsafe memory.

从类继承的方法 java.lang.Object

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

构造器详细资料

U

public U()

方法详细资料

allocateMemory

public static long allocateMemory(long size)

Allocates a new block of native memory, of the given size in bytes. The resulting native pointer will never be zero, and will be aligned for all node types.

reallocateMemory

public static long reallocateMemory(long address,
                                    long size)

Resizes a new block of native memory, to the given size in bytes. The resulting native pointer will be zero if and only if the requested size is zero. The resulting native pointer will be aligned for all node types. The address passed to this method may be null, in which case an allocation will be performed.

freeMemory

public static void freeMemory(long l)

Disposes of a block of native memory, as obtained from #allocateMemory or #reallocateMemory . The address passed to this method may be null, in which case no action is taken.

write

public static void write(long address,
                         byte[] src,
                         int offset,
                         int size)

write bytes to unsafe memory.

read

public static void read(long address,
                        byte[] src,
                        int offset,
                        int size)

read bytes from unsafe memory.

objectFieldOffset

public static long objectFieldOffset(Class klass,
                                     String field)

Get class field offset

compareAndSwapObject

public static boolean compareAndSwapObject(Object o,
                                           long offset,
                                           Object expect,
                                           Object value)

cas operation for Object Field.

compareAndSwapLong

public static boolean compareAndSwapLong(Object o,
                                         long offset,
                                         long expect,
                                         long value)

cas operation for long Field.

compareAndSwapInt

public static boolean compareAndSwapInt(Object o,
                                        long offset,
                                        int expect,
                                        int value)

cas operation for int Field.

getByte

public static byte getByte(long pos)