Package edu.wpi.first.util

Class WPIUtilJNI

java.lang.Object

edu.wpi.first.util.WPIUtilJNI

Direct Known Subclasses:

DataLogJNI

public class WPIUtilJNI
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WPIUtilJNI.Helper

Constructor Summary

Constructors

Constructor	Description
WPIUtilJNI()

Method Summary

Modifier and Type	Method	Description
static long	allocateRawFrame()
static int	createEvent(boolean manualReset, boolean initialState)
static int	createSemaphore(int initialCount, int maximumCount)
static void	destroyEvent(int eventHandle)
static void	destroySemaphore(int semHandle)
static void	disableMockTime()
static void	enableMockTime()
static void	forceLoad()	Force load the library.
static void	freeRawFrame(long frame)
static long	getSystemTime()
static long	now()
static boolean	releaseSemaphore(int semHandle, int releaseCount)
static void	resetEvent(int eventHandle)
static void	setEvent(int eventHandle)
static void	setMockTime(long time)
static void	waitForObject(int handle)	Waits for a handle to be signaled.
static int[]	waitForObjects(int[] handles)	Waits for one or more handles to be signaled.
static int[]	waitForObjectsTimeout(int[] handles, double timeout)	Waits for one or more handles to be signaled, with timeout.
static boolean	waitForObjectTimeout(int handle, double timeout)	Waits for a handle to be signaled, with timeout.
static void	writeStderr(String str)

Methods inherited from class java.lang.Object

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

Constructor Details

WPIUtilJNI

public WPIUtilJNI()

Method Details

forceLoad

public static void forceLoad() throws IOException

Force load the library.

Throws:

IOException - if the library failed to load

writeStderr

public static void writeStderr(String str)

enableMockTime

public static void enableMockTime()

disableMockTime

public static void disableMockTime()

setMockTime

public static void setMockTime(long time)

now

public static long now()

getSystemTime

public static long getSystemTime()

createEvent

public static int createEvent(boolean manualReset, boolean initialState)

destroyEvent

public static void destroyEvent(int eventHandle)

setEvent

public static void setEvent(int eventHandle)

resetEvent

public static void resetEvent(int eventHandle)

createSemaphore

public static int createSemaphore(int initialCount, int maximumCount)

destroySemaphore

public static void destroySemaphore(int semHandle)

releaseSemaphore

public static boolean releaseSemaphore(int semHandle, int releaseCount)

allocateRawFrame

public static long allocateRawFrame()

freeRawFrame

public static void freeRawFrame(long frame)

waitForObject

public static void waitForObject(int handle) throws InterruptedException

Waits for a handle to be signaled.

Parameters:

handle - handle to wait on

Throws:

InterruptedException - on failure (e.g. object was destroyed)

waitForObjectTimeout

public static boolean waitForObjectTimeout(int handle, double timeout) throws InterruptedException

Waits for a handle to be signaled, with timeout.

Parameters:

handle - handle to wait on

timeout - timeout in seconds

Returns:

True if timeout reached without handle being signaled

Throws:

InterruptedException - on failure (e.g. object was destroyed)

waitForObjects

public static int[] waitForObjects(int[] handles) throws InterruptedException

Waits for one or more handles to be signaled.

Invalid handles are treated as signaled; the returned array will have the handle error bit set for any invalid handles.

Parameters:

handles - array of handles to wait on

Returns:

array of signaled handles

Throws:

InterruptedException - on failure (e.g. no objects were signaled)

waitForObjectsTimeout

public static int[] waitForObjectsTimeout(int[] handles, double timeout) throws InterruptedException

Waits for one or more handles to be signaled, with timeout.

Invalid handles are treated as signaled; the returned array will have the handle error bit set for any invalid handles.

Parameters:

handles - array of handles to wait on

timeout - timeout in seconds

Returns:

array of signaled handles; empty if timeout reached without any handle being signaled

Throws:

InterruptedException - on failure (e.g. no objects were signaled and no timeout)