101 lines
4.1 KiB
Java
101 lines
4.1 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.jni;
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/** Global
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*
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* @author Mladen Turk
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*/
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public class Global {
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/**
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* Create and initialize a mutex that can be used to synchronize both
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* processes and threads. Note: There is considerable overhead in using
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* this API if only cross-process or cross-thread mutual exclusion is
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* required. See apr_proc_mutex.h and apr_thread_mutex.h for more
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* specialized lock routines.
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* <br><b>Warning :</b> Check APR_HAS_foo_SERIALIZE defines to see if the platform supports
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* APR_LOCK_foo. Only APR_LOCK_DEFAULT is portable.
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* @param fname A file name to use if the lock mechanism requires one. This
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* argument should always be provided. The lock code itself will
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* determine if it should be used.
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* @param mech The mechanism to use for the interprocess lock, if any; one of
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* <PRE>
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* APR_LOCK_FCNTL
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* APR_LOCK_FLOCK
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* APR_LOCK_SYSVSEM
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* APR_LOCK_POSIXSEM
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* APR_LOCK_PROC_PTHREAD
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* APR_LOCK_DEFAULT pick the default mechanism for the platform
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* </PRE>
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* @param pool the pool from which to allocate the mutex.
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* @return Newly created mutex.
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* @throws Error If an error occurred
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*/
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public static native long create(String fname, int mech, long pool)
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throws Error;
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/**
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* Re-open a mutex in a child process.
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* @param fname A file name to use if the mutex mechanism requires one. This
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* argument should always be provided. The mutex code itself will
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* determine if it should be used. This filename should be the
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* same one that was passed to apr_proc_mutex_create().
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* @param pool The pool to operate on.
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* This function must be called to maintain portability, even
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* if the underlying lock mechanism does not require it.
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* @return Newly opened mutex.
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* @throws Error If an error occurred
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*/
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public static native long childInit(String fname, long pool)
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throws Error;
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/**
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* Acquire the lock for the given mutex. If the mutex is already locked,
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* the current thread will be put to sleep until the lock becomes available.
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* @param mutex the mutex on which to acquire the lock.
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* @return the operation status
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*/
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public static native int lock(long mutex);
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/**
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* Attempt to acquire the lock for the given mutex. If the mutex has already
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* been acquired, the call returns immediately with APR_EBUSY. Note: it
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* is important that the APR_STATUS_IS_EBUSY(s) macro be used to determine
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* if the return value was APR_EBUSY, for portability reasons.
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* @param mutex the mutex on which to attempt the lock acquiring.
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* @return the operation status
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*/
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public static native int trylock(long mutex);
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/**
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* Release the lock for the given mutex.
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* @param mutex the mutex from which to release the lock.
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* @return the operation status
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*/
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public static native int unlock(long mutex);
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/**
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* Destroy the mutex and free the memory associated with the lock.
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* @param mutex the mutex to destroy.
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* @return the operation status
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*/
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public static native int destroy(long mutex);
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}
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