org.apache.tomcat.jni.Poll Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.jni;
/** Poll
*
* @author Mladen Turk
*/
public class Poll {
/**
* Poll return values
*/
/** Can read without blocking */
public static final int APR_POLLIN = 0x001;
/** Priority data available */
public static final int APR_POLLPRI = 0x002;
/** Can write without blocking */
public static final int APR_POLLOUT = 0x004;
/** Pending error */
public static final int APR_POLLERR = 0x010;
/** Hangup occurred */
public static final int APR_POLLHUP = 0x020;
/** Descriptor invalid */
public static final int APR_POLLNVAL = 0x040;
/**
* Pollset Flags
*/
/** Adding or Removing a Descriptor is thread safe */
public static final int APR_POLLSET_THREADSAFE = 0x001;
/** Used in apr_pollfd_t to determine what the apr_descriptor is
* apr_datatype_e enum
*/
public static final int APR_NO_DESC = 0; /** nothing here */
public static final int APR_POLL_SOCKET = 1; /** descriptor refers to a socket */
public static final int APR_POLL_FILE = 2; /** descriptor refers to a file */
public static final int APR_POLL_LASTDESC = 3; /** descriptor is the last one in the list */
/**
* Setup a pollset object.
* If flags equals APR_POLLSET_THREADSAFE, then a pollset is
* created on which it is safe to make concurrent calls to
* apr_pollset_add(), apr_pollset_remove() and apr_pollset_poll() from
* separate threads. This feature is only supported on some
* platforms; the apr_pollset_create() call will fail with
* APR_ENOTIMPL on platforms where it is not supported.
* @param size The maximum number of descriptors that this pollset can hold
* @param p The pool from which to allocate the pollset
* @param flags Optional flags to modify the operation of the pollset.
* @param ttl Maximum time to live for a particular socket.
* @return The pointer in which to return the newly created object
* @throws Error Pollset creation failed
*/
public static native long create(int size, long p, int flags, long ttl)
throws Error;
/**
* Destroy a pollset object
* @param pollset The pollset to destroy
* @return the operation status
*/
public static native int destroy(long pollset);
/**
* Add a socket to a pollset with the default timeout.
* @param pollset The pollset to which to add the socket
* @param sock The sockets to add
* @param reqevents requested events
* @return the operation status
*/
public static native int add(long pollset, long sock,
int reqevents);
/**
* Add a socket to a pollset with a specific timeout.
* @param pollset The pollset to which to add the socket
* @param sock The sockets to add
* @param reqevents requested events
* @param timeout requested timeout in microseconds (-1 for infinite)
* @return the operation status
*/
public static native int addWithTimeout(long pollset, long sock,
int reqevents, long timeout);
/**
* Remove a descriptor from a pollset
* @param pollset The pollset from which to remove the descriptor
* @param sock The socket to remove
* @return the operation status
*/
public static native int remove(long pollset, long sock);
/**
* Block for activity on the descriptor(s) in a pollset
* @param pollset The pollset to use
* @param timeout Timeout in microseconds
* @param descriptors Array of signaled descriptors (output parameter)
* The descriptor array must be two times the size of pollset.
* and are populated as follows:
*
* descriptors[2n + 0] -> returned events
* descriptors[2n + 1] -> socket
*
* @param remove Remove signaled descriptors from pollset
* @return Number of signaled descriptors (output parameter)
* or negative APR error code.
*/
public static native int poll(long pollset, long timeout,
long [] descriptors, boolean remove);
/**
* Maintain on the descriptor(s) in a pollset
* @param pollset The pollset to use
* @param descriptors Array of signaled descriptors (output parameter)
* The descriptor array must be the size of pollset.
* and are populated as follows:
*
* descriptors[n] -> socket
*
* @param remove Remove signaled descriptors from pollset
* @return Number of signaled descriptors (output parameter)
* or negative APR error code.
*/
public static native int maintain(long pollset, long [] descriptors,
boolean remove);
/**
* Set the socket time to live.
* @param pollset The pollset to use
* @param ttl Timeout in microseconds
*/
public static native void setTtl(long pollset, long ttl);
/**
* Get the socket time to live.
* @param pollset The pollset to use
* @return Timeout in microseconds
*/
public static native long getTtl(long pollset);
/**
* Return all descriptor(s) in a pollset
* @param pollset The pollset to use
* @param descriptors Array of descriptors (output parameter)
* The descriptor array must be two times the size of pollset.
* and are populated as follows:
*
* descriptors[2n + 0] -> returned events
* descriptors[2n + 1] -> socket
*
* @return Number of descriptors (output parameter) in the Poll
* or negative APR error code.
*/
public static native int pollset(long pollset, long [] descriptors);
/**
* Make poll() return.
*
* @param pollset The pollset to use
* @return Negative APR error code
*/
public static native int interrupt(long pollset);
/**
* Check if interrupt() is allowed.
*
* @param pollset The pollset to use
* @return true if {@link #interrupt(long)} is allowed, else
* false
*/
public static native boolean wakeable(long pollset);
}