File	Doc	Category	Size	Date	Package
Lock.java	API Doc	Apache Tomcat 6.0.14	5215	Fri Jul 20 04:20:32 BST 2007	org.apache.tomcat.jni

Lock

• java.lang.Object

Fields Summary
public static final int	APR_LOCK_FCNTL Enumerated potential types for APR process locking methods Warning : Check APR_HAS_foo_SERIALIZE defines to see if the platform supports APR_LOCK_foo. Only APR_LOCK_DEFAULT is portable.
public static final int	APR_LOCK_FLOCK fcntl()
public static final int	APR_LOCK_SYSVSEM flock()
public static final int	APR_LOCK_PROC_PTHREAD System V Semaphores
public static final int	APR_LOCK_POSIXSEM POSIX pthread process-based locking
public static final int	APR_LOCK_DEFAULT POSIX semaphore process-based locking

Constructors Summary

Methods Summary
public static native long	childInit(java.lang.String fname, long pool) Re-open a mutex in a child process. This function must be called to maintain portability, even if the underlying lock mechanism does not require it. param fname A file name to use if the mutex mechanism requires one. This argument should always be provided. The mutex code itself will determine if it should be used. This filename should be the same one that was passed to apr_proc_mutex_create(). param pool The pool to operate on. return Newly opened mutex.
public static native long	create(java.lang.String fname, int mech, long pool) Create and initialize a mutex that can be used to synchronize processes. Warning : Check APR_HAS_foo_SERIALIZE defines to see if the platform supports APR_LOCK_foo. Only APR_LOCK_DEFAULT is portable. param fname A file name to use if the lock mechanism requires one. This argument should always be provided. The lock code itself will determine if it should be used. param mech The mechanism to use for the interprocess lock, if any; one of APR_LOCK_FCNTL APR_LOCK_FLOCK APR_LOCK_SYSVSEM APR_LOCK_POSIXSEM APR_LOCK_PROC_PTHREAD APR_LOCK_DEFAULT pick the default mechanism for the platform param pool the pool from which to allocate the mutex. return Newly created mutex.
public static native java.lang.String	defname() Display the name of the default mutex: APR_LOCK_DEFAULT
public static native int	destroy(long mutex) Destroy the mutex and free the memory associated with the lock. param mutex the mutex to destroy.
public static native int	lock(long mutex) Acquire the lock for the given mutex. If the mutex is already locked, the current thread will be put to sleep until the lock becomes available. param mutex the mutex on which to acquire the lock.
public static native java.lang.String	lockfile(long mutex) Return the name of the lockfile for the mutex, or NULL if the mutex doesn't use a lock file
public static native java.lang.String	name(long mutex) Display the name of the mutex, as it relates to the actual method used. This matches the valid options for Apache's AcceptMutex directive param mutex the name of the mutex
public static native int	trylock(long mutex) Attempt to acquire the lock for the given mutex. If the mutex has already been acquired, the call returns immediately with APR_EBUSY. Note: it is important that the APR_STATUS_IS_EBUSY(s) macro be used to determine if the return value was APR_EBUSY, for portability reasons. param mutex the mutex on which to attempt the lock acquiring.
public static native int	unlock(long mutex) Release the lock for the given mutex. param mutex the mutex from which to release the lock.