de.gsi.math.utils

Class ConcurrencyUtils

java.lang.Object

de.gsi.math.utils.ConcurrencyUtils

public class ConcurrencyUtils
extends Object

Concurrency utilities.

Author:

Piotr Wendykier (piotr.wendykier@gmail.com), rstein - updates and code reformatting/removing obsolete code

Method Summary

Modifier and Type	Method and Description
static int	extendDimension(int x)
static int	getNumberOfProcessors() Returns the number of available processors
static int	getNumberOfThreads() Returns the current number of threads.
static boolean	isForceThreads()
static boolean	isPowerOf2(int n) Checks if n is a power-of-two number
static int	nextExp2(int n)
static int	nextPow2(int n) Returns the closest power of two greater than or equal to x.
static int	prevPow2(int x) Returns the closest power of two less than or equal to x
static void	setForceThreads(boolean forceThreads)
static void	setNumberOfThreads(int n) Sets the number of threads
static void	sleep(long millis) Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds.
static <T> Future<T>	submit(Callable<T> task) Submits a value-returning task for execution and returns a Future representing the pending results of the task.
static Future<?>	submit(Runnable task) Submits a Runnable task for execution and returns a Future representing that task.
static void	waitForCompletion(Future<?>[] futures) Waits for all threads to complete computation.

Methods inherited from class java.lang.Object

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

Method Detail

extendDimension

public static int extendDimension(int x)

getNumberOfProcessors

public static int getNumberOfProcessors()

Returns the number of available processors

Returns:

number of available processors

getNumberOfThreads

public static int getNumberOfThreads()

Returns the current number of threads.

Returns:

the current number of threads.

isForceThreads

public static boolean isForceThreads()

Returns:

the forceThreads

isPowerOf2

public static boolean isPowerOf2(int n)

Checks if n is a power-of-two number

Parameters:

n - input parameter

Returns:

true if n is power of 2

nextExp2

public static int nextExp2(int n)

nextPow2

public static int nextPow2(int n)

Returns the closest power of two greater than or equal to x.

Parameters:

n - input parameter

Returns:

the closest power of two greater than or equal to x

prevPow2

public static int prevPow2(int x)

Returns the closest power of two less than or equal to x

Parameters:

x - input parameter

Returns:

the closest power of two less then or equal to x

setForceThreads

public static void setForceThreads(boolean forceThreads)

Parameters:

forceThreads - the forceThreads to set

setNumberOfThreads

public static void setNumberOfThreads(int n)

Sets the number of threads

Parameters:

n - number of requested threads

sleep

public static void sleep(long millis)

Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds.

Parameters:

millis - sleep duration in [ms]

submit

public static <T> Future<T> submit(Callable<T> task)

Submits a value-returning task for execution and returns a Future representing the pending results of the task.

Type Parameters:

T - value type of callable

Parameters:

task - task for execution

Returns:

a handle to the task submitted for execution

submit

public static Future<?> submit(Runnable task)

Submits a Runnable task for execution and returns a Future representing that task.

Parameters:

task - task for execution

Returns:

a handle to the task submitted for execution

waitForCompletion

public static void waitForCompletion(Future<?>[] futures)

Waits for all threads to complete computation.

Parameters:

futures - handles to running threads