com.oracle.svm.core.os

Class OSCommittedMemoryProvider

java.lang.Object

com.oracle.svm.core.os.OSCommittedMemoryProvider

All Implemented Interfaces:

CommittedMemoryProvider

public class OSCommittedMemoryProvider
extends Object
implements CommittedMemoryProvider

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	OSCommittedMemoryProvider.VirtualMemoryTracker

Field Summary

Fields inherited from interface com.oracle.svm.core.os.CommittedMemoryProvider

UNALIGNED

Constructor Summary

Constructors

Constructor and Description
OSCommittedMemoryProvider()

Method Summary

Modifier and Type	Method and Description
org.graalvm.word.Pointer	allocate(org.graalvm.word.UnsignedWord size, org.graalvm.word.UnsignedWord alignment, boolean executable) Allocate the requested amount of virtual memory at the requested alignment.
boolean	free(org.graalvm.word.PointerBase start, org.graalvm.word.UnsignedWord nbytes, org.graalvm.word.UnsignedWord alignment, boolean executable) Release a block of committed memory that was allocated with CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean), requiring the exact same parameter values that were originally passed to CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).
int	initialize(org.graalvm.nativeimage.c.type.WordPointer isolatePointer, CEntryPointCreateIsolateParameters parameters) Performs initializations for the current isolate, before any other methods of this interface may be called.
int	tearDown() Tear down for the current isolate.
protected static void	tearDownVirtualMemoryConsumers()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.oracle.svm.core.os.CommittedMemoryProvider

afterGarbageCollection, beforeGarbageCollection, get, getGranularity

Constructor Detail

OSCommittedMemoryProvider

public OSCommittedMemoryProvider()

Method Detail

initialize

public int initialize(org.graalvm.nativeimage.c.type.WordPointer isolatePointer,
                      CEntryPointCreateIsolateParameters parameters)

Description copied from interface: CommittedMemoryProvider

Performs initializations for the current isolate, before any other methods of this interface may be called.

Specified by:

initialize in interface CommittedMemoryProvider

Returns:

zero in case of success, non-zero in case of an error.

tearDownVirtualMemoryConsumers

protected static void tearDownVirtualMemoryConsumers()

tearDown

public int tearDown()

Description copied from interface: CommittedMemoryProvider

Tear down for the current isolate. This must be the last method of this interface that is called in an isolate.

Specified by:

tearDown in interface CommittedMemoryProvider

Returns:

zero in case of success, non-zero in case of an error.

allocate

public org.graalvm.word.Pointer allocate(org.graalvm.word.UnsignedWord size,
                                         org.graalvm.word.UnsignedWord alignment,
                                         boolean executable)

Allocate the requested amount of virtual memory at the requested alignment.

Specified by:

allocate in interface CommittedMemoryProvider

Parameters:

size - The number of bytes to allocate, which is rounded up to the next multiple of the granularity if required.

alignment - The required alignment of the block start, which should be a multiple of the granularity, or CommittedMemoryProvider.UNALIGNED.

executable - Whether the block must be executable.

Returns:

A Pointer to the aligned memory, or a null Pointer.

free

public boolean free(org.graalvm.word.PointerBase start,
                    org.graalvm.word.UnsignedWord nbytes,
                    org.graalvm.word.UnsignedWord alignment,
                    boolean executable)

Description copied from interface: CommittedMemoryProvider

Release a block of committed memory that was allocated with CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean), requiring the exact same parameter values that were originally passed to CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).

Specified by:

free in interface CommittedMemoryProvider

Parameters:

start - The start of the memory block, as returned by CommittedMemoryProvider.allocate(org.graalvm.word.UnsignedWord, org.graalvm.word.UnsignedWord, boolean).

nbytes - The originally requested size in bytes.

alignment - The originally requested alignment.

executable - Whether the block was requested to be executable.

Returns:

true on success, or false otherwise.