org.apache.cassandra.utils

Class CLibrary

java.lang.Object

org.apache.cassandra.utils.CLibrary

public final class CLibrary
extends java.lang.Object

Method Summary

Methods

Modifier and Type	Method and Description
static int	close(int fd)
static int	fcntl(int fd, int command, long flags)
static int	fsync(int fd)
static int	getfd(java.io.FileDescriptor descriptor) Get system file descriptor from FileDescriptor object.
static boolean	jnaAvailable()
static boolean	jnaMemoryLockable()
static int	open(java.lang.String path, int flags)
static int	posix_fadvise(int fd, long offset, int len, int flag)
static int	preheatPage(int fd, long position) Suggest kernel to preheat one page for the given file.
static void	tryCloseFD(int fd)
static int	tryFcntl(int fd, int command, int flags)
static void	tryMlockall()
static int	tryOpenDirectory(java.lang.String path)
static void	trySkipCache(int fd, long offset, int len)
static void	trySync(int fd)

Methods inherited from class java.lang.Object

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

Method Detail

fcntl

public static int fcntl(int fd,
        int command,
        long flags)
                 throws com.sun.jna.LastErrorException

Throws:

com.sun.jna.LastErrorException

posix_fadvise

public static int posix_fadvise(int fd,
                long offset,
                int len,
                int flag)
                         throws com.sun.jna.LastErrorException

Throws:

com.sun.jna.LastErrorException

open

public static int open(java.lang.String path,
       int flags)
                throws com.sun.jna.LastErrorException

Throws:

com.sun.jna.LastErrorException

fsync

public static int fsync(int fd)
                 throws com.sun.jna.LastErrorException

Throws:

com.sun.jna.LastErrorException

close

public static int close(int fd)
                 throws com.sun.jna.LastErrorException

Throws:

com.sun.jna.LastErrorException

jnaAvailable

public static boolean jnaAvailable()

jnaMemoryLockable

public static boolean jnaMemoryLockable()

tryMlockall

public static void tryMlockall()

trySkipCache

public static void trySkipCache(int fd,
                long offset,
                int len)

tryFcntl

public static int tryFcntl(int fd,
           int command,
           int flags)

tryOpenDirectory

public static int tryOpenDirectory(java.lang.String path)

trySync

public static void trySync(int fd)

tryCloseFD

public static void tryCloseFD(int fd)

getfd

public static int getfd(java.io.FileDescriptor descriptor)

Get system file descriptor from FileDescriptor object.

Parameters:

descriptor - - FileDescriptor objec to get fd from

Returns:

file descriptor, -1 or error

preheatPage

public static int preheatPage(int fd,
              long position)

Suggest kernel to preheat one page for the given file.

Parameters:

fd - The file descriptor of file to preheat.

position - The offset of the block.

Returns:

On success, zero is returned. On error, an error number is returned.