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java.lang.Object javax.realtime.RealtimeSystem
public final class RealtimeSystem
RealtimeSystem
provides a means for tuning the behavior of the
implementation by specifying parameters such as the maximum number of
locks that can be in use concurrently, and the monitor control policy.
In addition, RealtimeSystem
provides a mechanism for obtaining access to
the security manager, garbage collector and scheduler, to make queries
from them or to set parameters.
Field Summary | |
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static byte |
BIG_ENDIAN
Value to indicate the byte ordering for the underlying hardware. |
static byte |
BYTE_ORDER
The byte ordering of the underlying hardware. |
static byte |
LITTLE_ENDIAN
Value to indicate the byte ordering for the underlying hardware. |
Method Summary | |
---|---|
static GarbageCollector |
currentGC()
Return a reference to the currently active garbage collector for the heap. |
static int |
getConcurrentLocksUsed()
Gets the maximum number of locks that have been used concurrently. |
static MonitorControl |
getInitialMonitorControl()
Returns the monitor control object that represents the initial monitor control policy. |
static int |
getMaximumConcurrentLocks()
Gets the maximum number of locks that can be used concurrently without incurring an execution time increase as set by the setMaximumConcurrentLocks() methods. |
static RealtimeSecurity |
getSecurityManager()
Gets a reference to the security manager used to control access to real-time system features such as access to physical memory. |
static void |
setMaximumConcurrentLocks(int numLocks)
Sets the anticipated maximum number of locks that may be held or waited on concurrently. |
static void |
setMaximumConcurrentLocks(int number,
boolean hard)
Sets the anticipated maximum number of locks that may be held or waited on concurrently. |
static void |
setSecurityManager(RealtimeSecurity manager)
Sets a new real-time security manager. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final byte BIG_ENDIAN
public static final byte LITTLE_ENDIAN
public static final byte BYTE_ORDER
Method Detail |
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public static GarbageCollector currentGC()
GarbageCollector
object which is the current collector collecting
objects on the traditional Java heap.public static int getConcurrentLocksUsed()
public static int getMaximumConcurrentLocks()
setMaximumConcurrentLocks()
methods.
Note: Any relationship between this method and setMaximumConcurrentLocks
is
implementation-specific. This method returns the actual maximum number of concurrent locks the
platform can currently support, or Integer.MAX_VALUE
if
there is no maximum. The setMaximumConcurrentLocks
method give the implementation a hint
as to the maximum number of concurrent locks it should expect.
public static RealtimeSecurity getSecurityManager()
RealtimeSecurity
object representing the default real-time security manager.public static void setMaximumConcurrentLocks(int numLocks)
numLocks
- An integer whose value becomes the number of
locks that can be in simultaneous use without incurring an
execution time increase. If number
is less than or
equal to zero nothing happens. If the system does not use this
hint this method has no effect other than on the value returned
by getMaximumConcurrentLocks().public static void setMaximumConcurrentLocks(int number, boolean hard)
number
- The maximum number of locks that can be in
simultaneous use without incurring an execution time increase.
If number
is less than or equal to zero nothing
happens. If the system does not use this hint this method has
no effect other than on the value returned by
getMaximumConcurrentLocks().hard
- If true, number
sets a limit. If a lock is attempted which would cause the
number of locks to exceed number
then a ResourceLimitError
is thrown.
If
the system does not limit use of concurrent locks, this parameter is silently ignored.public static void setSecurityManager(RealtimeSecurity manager)
manager
- A RealtimeSecurity
object which will become the new security manager.
java.lang.SecurityException
- Thrown if security manager has already been set.public static MonitorControl getInitialMonitorControl()
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