Package one.nio.mem

Class FixedSizeAllocator

java.lang.Object

one.nio.mem.FixedSizeAllocator

All Implemented Interfaces:

Allocator

public class FixedSizeAllocator
extends Object
implements Allocator

Field Summary

Fields

Modifier and Type	Field	Description
protected final long	chunkSize
protected final long	entrySize
protected long	head
protected static final long	headOffset
protected final long	startAddress
protected long	totalMemory
protected long	totalPages
protected AtomicLong	usedPages

Constructor Summary

Constructors

Constructor	Description
FixedSizeAllocator(long entrySize, long chunkSize)
FixedSizeAllocator(long startAddress, long totalMemory, long entrySize)
FixedSizeAllocator(long startAddress, long totalMemory, long entrySize, long head)

Method Summary

Modifier and Type	Method	Description
long	calloc(int size)
long	chunkSize()
protected int	countFreePages()
long	entrySize()
void	free(long entry)
long	freePages()
protected long	getMemoryFromSystem(long size)
long	head()
long	malloc()
long	malloc(int size)
static void	relocate(long currentPtr, long delta)
long	startAddress()
long	totalMemory()
long	totalPages()
long	usedMemory()
long	usedPages()
void	verify()	Verify the layout of the heap.

Methods inherited from class java.lang.Object

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

Field Details

headOffset

protected static final long headOffset

head

protected volatile long head

usedPages

protected AtomicLong usedPages

startAddress

protected final long startAddress

entrySize

protected final long entrySize

chunkSize

protected final long chunkSize

totalMemory

protected long totalMemory

totalPages

protected long totalPages

Constructor Details

FixedSizeAllocator

public FixedSizeAllocator(long entrySize,
 long chunkSize)

FixedSizeAllocator

public FixedSizeAllocator(long startAddress,
 long totalMemory,
 long entrySize)

FixedSizeAllocator

public FixedSizeAllocator(long startAddress,
 long totalMemory,
 long entrySize,
 long head)

Method Details

relocate

public static void relocate(long currentPtr,
 long delta)

head

public long head()

countFreePages

protected int countFreePages()

entrySize

public long entrySize()

chunkSize

public long chunkSize()

startAddress

public long startAddress()

totalMemory

public long totalMemory()

malloc

public long malloc()

malloc

public long malloc(int size)

Specified by:

malloc in interface Allocator

calloc

public long calloc(int size)

Specified by:

calloc in interface Allocator

free

public void free(long entry)

Specified by:

free in interface Allocator

verify

public void verify()

Description copied from interface: Allocator

Verify the layout of the heap. Expensive operation, used only for debugging purposes.

Specified by:

verify in interface Allocator

getMemoryFromSystem

protected long getMemoryFromSystem(long size)

usedPages

public long usedPages()

totalPages

public long totalPages()

freePages

public long freePages()

usedMemory

public long usedMemory()