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Java Source Code / Java Documentation » 6.0 JDK Core » Collections Jar Zip Logging regex » java.util.concurrent.locks

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

java.util.concurrent.locks .LockSupport

LockSupport
public class LockSupport (Code)

Method Summary
public static Object	getBlocker(Thread t) Returns the blocker object supplied to the most recent invocation of a park method that has not yet unblocked, or null if not blocked.
public static void	park(Object blocker) Disables the current thread for thread scheduling purposes unless the permit is available. If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of three things happens: Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or Some other thread the current thread; or The call spuriously (that is, for no reason) returns. This method does not report which of these caused the method to return.
public static void	park() Disables the current thread for thread scheduling purposes unless the permit is available. If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of three things happens: Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or Some other thread the current thread; or The call spuriously (that is, for no reason) returns. This method does not report which of these caused the method to return.
public static void	parkNanos(Object blocker, long nanos) Disables the current thread for thread scheduling purposes, for up to the specified waiting time, unless the permit is available. If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of four things happens: Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or Some other thread the current thread; or The specified waiting time elapses; or The call spuriously (that is, for no reason) returns. This method does not report which of these caused the method to return.
public static void	parkNanos(long nanos) Disables the current thread for thread scheduling purposes, for up to the specified waiting time, unless the permit is available. If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of four things happens: Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or Some other thread the current thread; or The specified waiting time elapses; or The call spuriously (that is, for no reason) returns. This method does not report which of these caused the method to return.
public static void	parkUntil(Object blocker, long deadline) Disables the current thread for thread scheduling purposes, until the specified deadline, unless the permit is available. If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of four things happens: Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or Some other thread the current thread; or The specified deadline passes; or The call spuriously (that is, for no reason) returns. This method does not report which of these caused the method to return.
public static void	parkUntil(long deadline) Disables the current thread for thread scheduling purposes, until the specified deadline, unless the permit is available. If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of four things happens: Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or Some other thread the current thread; or The specified deadline passes; or The call spuriously (that is, for no reason) returns. This method does not report which of these caused the method to return.
public static void	unpark(Thread thread) Makes available the permit for the given thread, if it was not already available.

Method Detail

getBlocker
public static Object getBlocker(Thread t)(Code)
	Returns the blocker object supplied to the most recent invocation of a park method that has not yet unblocked, or null if not blocked. The value returned is just a momentary snapshot -- the thread may have since unblocked or blocked on a different blocker object. the blocker since: 1.6

park

public static void park(Object blocker)(Code)

Disables the current thread for thread scheduling purposes unless the permit is available.

If the permit is available then it is consumed and the call returns immediately; otherwise the current thread becomes disabled for thread scheduling purposes and lies dormant until one of three things happens:

Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or
Some other thread the current thread; or
The call spuriously (that is, for no reason) returns.

This method does not report which of these caused the method to return. Callers should re-check the conditions which caused the thread to park in the first place. Callers may also determine, for example, the interrupt status of the thread upon return.
Parameters:
blocker - the synchronization object responsible for thisthread parking
since:
1.6

park

public static void park()(Code)

Disables the current thread for thread scheduling purposes unless the permit is available.

Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or
Some other thread the current thread; or
The call spuriously (that is, for no reason) returns.

parkNanos

public static void parkNanos(Object blocker, long nanos)(Code)

Disables the current thread for thread scheduling purposes, for up to the specified waiting time, unless the permit is available.

Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or
Some other thread the current thread; or
The specified waiting time elapses; or
The call spuriously (that is, for no reason) returns.

This method does not report which of these caused the method to return. Callers should re-check the conditions which caused the thread to park in the first place. Callers may also determine, for example, the interrupt status of the thread, or the elapsed time upon return.
Parameters:
  blocker - the synchronization object responsible for thisthread parking
Parameters:
  nanos - the maximum number of nanoseconds to wait
since:
   1.6

parkNanos

public static void parkNanos(long nanos)(Code)

Disables the current thread for thread scheduling purposes, for up to the specified waiting time, unless the permit is available.

Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or
Some other thread the current thread; or
The specified waiting time elapses; or
The call spuriously (that is, for no reason) returns.

This method does not report which of these caused the method to return. Callers should re-check the conditions which caused the thread to park in the first place. Callers may also determine, for example, the interrupt status of the thread, or the elapsed time upon return.
Parameters:
nanos - the maximum number of nanoseconds to wait

parkUntil

public static void parkUntil(Object blocker, long deadline)(Code)

Disables the current thread for thread scheduling purposes, until the specified deadline, unless the permit is available.

Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or
Some other thread the current thread; or
The specified deadline passes; or
The call spuriously (that is, for no reason) returns.

This method does not report which of these caused the method to return. Callers should re-check the conditions which caused the thread to park in the first place. Callers may also determine, for example, the interrupt status of the thread, or the current time upon return.
Parameters:
  blocker - the synchronization object responsible for thisthread parking
Parameters:
  deadline - the absolute time, in milliseconds from the Epoch,to wait until
since:
   1.6

parkUntil

public static void parkUntil(long deadline)(Code)

Disables the current thread for thread scheduling purposes, until the specified deadline, unless the permit is available.

Some other thread invokes LockSupport.unpark unpark with the current thread as the target; or
Some other thread the current thread; or
The specified deadline passes; or
The call spuriously (that is, for no reason) returns.

This method does not report which of these caused the method to return. Callers should re-check the conditions which caused the thread to park in the first place. Callers may also determine, for example, the interrupt status of the thread, or the current time upon return.
Parameters:
deadline - the absolute time, in milliseconds from the Epoch,to wait until

unpark
public static void unpark(Thread thread)(Code)
	Makes available the permit for the given thread, if it was not already available. If the thread was blocked on park then it will unblock. Otherwise, its next call to park is guaranteed not to block. This operation is not guaranteed to have any effect at all if the given thread has not been started. Parameters: thread - the thread to unpark, or null , in which casethis operation has no effect

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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