org.apache.hadoop.hdfs.util
Interface RwLock

public interface RwLock

Read-write lock interface.

Method Summary

boolean	hasReadLock() Check if the current thread holds read lock.
boolean	hasWriteLock() Check if the current thread holds write lock.
void	longReadLockInterruptibly() Acquire the long read lock, unless interrupted while waiting.
void	longReadUnlock() Release the long read lock.
void	readLock() Acquire read lock.
void	readUnlock() Release read lock.
void	writeLock() Acquire write lock.
void	writeLockInterruptibly() Acquire write lock, unless interrupted while waiting
void	writeUnlock() Release write lock.

Method Detail

readLock

void readLock()

Acquire read lock.

longReadLockInterruptibly

void longReadLockInterruptibly()
                               throws InterruptedException

Acquire the long read lock, unless interrupted while waiting. The long read lock should also serve to block all concurrent writers.

Throws:

InterruptedException

longReadUnlock

void longReadUnlock()

Release the long read lock.

readUnlock

void readUnlock()

Release read lock.

hasReadLock

boolean hasReadLock()

Check if the current thread holds read lock.

writeLock

void writeLock()

Acquire write lock.

writeLockInterruptibly

void writeLockInterruptibly()
                            throws InterruptedException

Acquire write lock, unless interrupted while waiting

Throws:

InterruptedException

writeUnlock

void writeUnlock()

Release write lock.

hasWriteLock

boolean hasWriteLock()

Check if the current thread holds write lock.