one.nio.os

Class Proc

java.lang.Object

one.nio.os.Proc

public final class Proc
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	CLONE_NEWCGROUP
static int	CLONE_NEWIPC
static int	CLONE_NEWNET
static int	CLONE_NEWPID
static int	CLONE_NEWUSER
static int	CLONE_NEWUTS
static int	IOPRIO_CLASS_BE
static int	IOPRIO_CLASS_IDLE
static int	IOPRIO_CLASS_RT
static boolean	IS_SUPPORTED
static int	SCHED_BATCH
static int	SCHED_IDLE
static int	SCHED_OTHER

Constructor Summary

Constructors

Constructor and Description
Proc()

Method Summary

Modifier and Type	Method and Description
static long[]	getAffinity(int pid)
static int	getpid()
static int	getppid()
static int	getpriority(int pid) Obtain the nice value of a process
static int	gettid()
static int	ioprio_get(int pid)
static int	ioprio_set(int pid, int ioprio)
static long	sched_getaffinity(int pid)
static int	sched_getscheduler(int pid)
static int	sched_setaffinity(int pid, long mask)
static int	sched_setscheduler(int pid, int policy)
static int	setAffinity(int pid, long[] mask) The same as above, but allows an arbitrary long mask
static void	setDedicatedCpu(int pid, int cpu)
static int	setns(int fd, int nstype)
static int	setpriority(int pid, int value) Set the nice value of a process to value+ {NZERO}.

Methods inherited from class java.lang.Object

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

Field Detail

IS_SUPPORTED

public static final boolean IS_SUPPORTED

IOPRIO_CLASS_RT

public static final int IOPRIO_CLASS_RT

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Constant Field Values

IOPRIO_CLASS_BE

public static final int IOPRIO_CLASS_BE

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Constant Field Values

IOPRIO_CLASS_IDLE

public static final int IOPRIO_CLASS_IDLE

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Constant Field Values

SCHED_OTHER

public static final int SCHED_OTHER

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Constant Field Values

SCHED_BATCH

public static final int SCHED_BATCH

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Constant Field Values

SCHED_IDLE

public static final int SCHED_IDLE

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Constant Field Values

CLONE_NEWCGROUP

public static final int CLONE_NEWCGROUP

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Constant Field Values

CLONE_NEWUTS

public static final int CLONE_NEWUTS

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Constant Field Values

CLONE_NEWIPC

public static final int CLONE_NEWIPC

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Constant Field Values

CLONE_NEWUSER

public static final int CLONE_NEWUSER

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Constant Field Values

CLONE_NEWPID

public static final int CLONE_NEWPID

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Constant Field Values

CLONE_NEWNET

public static final int CLONE_NEWNET

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Constant Field Values

Constructor Detail

Proc

public Proc()

Method Detail

gettid

public static int gettid()

getpid

public static int getpid()

getppid

public static int getppid()

sched_setaffinity

public static int sched_setaffinity(int pid,
                                    long mask)

sched_getaffinity

public static long sched_getaffinity(int pid)

setAffinity

public static int setAffinity(int pid,
                              long[] mask)

The same as above, but allows an arbitrary long mask

Parameters:

pid - an id of a thread. If pid is zero, then the calling thread is used

mask - a thread's CPU affinity mask

Returns:

0 on success or errno on failure

getAffinity

public static long[] getAffinity(int pid)

setDedicatedCpu

public static void setDedicatedCpu(int pid,
                                   int cpu)

ioprio_set

public static int ioprio_set(int pid,
                             int ioprio)

ioprio_get

public static int ioprio_get(int pid)

sched_setscheduler

public static int sched_setscheduler(int pid,
                                     int policy)

Parameters:

pid - pid or tid. 0 for current thread

policy - one of the POSIX scheduling policies

Returns:

0 on success or errno on failure

sched_getscheduler

public static int sched_getscheduler(int pid)

Parameters:

pid - pid or tid. 0 for current thread

Returns:

the policy for the thread (a nonnegative integer)

getpriority

public static int getpriority(int pid)

Obtain the nice value of a process

Parameters:

pid - pid or tid. 0 for current thread

Returns:

an integer in the range -{NZERO} to {NZERO}-1. Otherwise, -1 shall be returned and errno set to indicate the error.

setpriority

public static int setpriority(int pid,
                              int value)

Set the nice value of a process to value+ {NZERO}. The default nice value is {NZERO}; lower nice values shall cause more favorable scheduling. While the range of valid nice values is [0,{NZERO}*2-1], implementations may enforce more restrictive limits. If value+ {NZERO} is less than the system's lowest supported nice value, setpriority() shall set the nice value to the lowest supported value; if value+ {NZERO} is greater than the system's highest supported nice value, setpriority() shall set the nice value to the highest supported value.

Parameters:

pid - pid or tid. 0 for current thread

value - a nice value

Returns:

0 on success; otherwise, -1 shall be returned and errno set to indicate the error.

setns

public static int setns(int fd,
                        int nstype)

Parameters:

fd - is a file descriptor referring to one of the namespace entries in a /proc/[pid]/ns/ directory

nstype - specifies which type of namespace the calling thread may be reassociated with. One of CLONE_* constants or 0 to allow any type of namespace to be joined

Returns:

0 on success or errno on failure