Package org.apache.hadoop.hdfs.util

Interface RwLock

All Known Subinterfaces:

Namesystem

All Known Implementing Classes:

FSNamesystem

public interface RwLock

Read-write lock interface.

Method Summary

Modifier and Type	Method	Description
boolean	hasReadLock()	Check if the current thread holds read lock.
boolean	hasWriteLock()	Check if the current thread holds write lock.
void	readLock()	Acquire read lock.
void	readLockInterruptibly()	Acquire read lock, unless interrupted while waiting
void	readUnlock()	Release read lock.
void	readUnlock(java.lang.String opName)	Release read lock with operation name.
void	writeLock()	Acquire write lock.
void	writeLockInterruptibly()	Acquire write lock, unless interrupted while waiting
void	writeUnlock()	Release write lock.
void	writeUnlock(java.lang.String opName)	Release write lock with operation name.

Method Detail

readLock

void readLock()

Acquire read lock.

readLockInterruptibly

void readLockInterruptibly()
                    throws java.lang.InterruptedException

Acquire read lock, unless interrupted while waiting

Throws:

java.lang.InterruptedException

readUnlock

void readUnlock()

Release read lock.

readUnlock

void readUnlock(java.lang.String opName)

Release read lock with operation name.

Parameters:

opName - Option name.

hasReadLock

boolean hasReadLock()

Check if the current thread holds read lock.

writeLock

void writeLock()

Acquire write lock.

writeLockInterruptibly

void writeLockInterruptibly()
                     throws java.lang.InterruptedException

Acquire write lock, unless interrupted while waiting

Throws:

java.lang.InterruptedException

writeUnlock

void writeUnlock()

Release write lock.

writeUnlock

void writeUnlock(java.lang.String opName)

Release write lock with operation name.

Parameters:

opName - Option name.

hasWriteLock

boolean hasWriteLock()

Check if the current thread holds write lock.