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- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2000-2003 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- * Portions of this software are based upon public domain software
- * originally written at the National Center for Supercomputing Applications,
- * University of Illinois, Urbana-Champaign.
- */
-
- #ifndef APR_QUEUE_H
- #define APR_QUEUE_H
-
- #if APR_HAS_THREADS
- /**
- * @file apr_queue.h
- * @brief Thread Safe FIFO bounded queue
- * @note Since most implementations of the queue are backed by a condition
- * variable implementation, it isn't available on systems without threads.
- * Although condition variables are some times available without threads.
- */
-
- #include "apu.h"
- #include "apr_errno.h"
- #include "apr_pools.h"
-
- #ifdef __cplusplus
- extern "C" {
- #endif /* __cplusplus */
-
- /**
- * @defgroup APR_Util_FIFO Thread Safe FIFO bounded queue
- * @ingroup APR_Util
- * @{
- */
-
- /**
- * opaque structure
- */
- typedef struct apr_queue_t apr_queue_t;
-
- /**
- * create a FIFO queue
- * @param queue The new queue
- * @param queue_capacity maximum size of the queue
- * @param a pool to allocate queue from
- */
- APU_DECLARE(apr_status_t) apr_queue_create(apr_queue_t **queue,
- unsigned int queue_capacity,
- apr_pool_t *a);
-
- /**
- * push/add a object to the queue, blocking if the queue is already full
- *
- * @param queue the queue
- * @param data the data
- * @returns APR_EINTR the blocking was interrupted (try again)
- * @returns APR_EOF the queue has been terminated
- * @returns APR_SUCCESS on a successfull push
- */
- APU_DECLARE(apr_status_t) apr_queue_push(apr_queue_t *queue, void *data);
-
- /**
- * pop/get an object from the queue, blocking if the queue is already empty
- *
- * @param queue the queue
- * @param data the data
- * @returns APR_EINTR the blocking was interrupted (try again)
- * @returns APR_EOF if the queue has been terminated
- * @returns APR_SUCCESS on a successfull pop
- */
- APU_DECLARE(apr_status_t) apr_queue_pop(apr_queue_t *queue, void **data);
-
- /**
- * push/add a object to the queue, returning immediatly if the queue is full
- *
- * @param queue the queue
- * @param data the data
- * @returns APR_EINTR the blocking operation was interrupted (try again)
- * @returns APR_EAGAIN the queue is full
- * @returns APR_EOF the queue has been terminated
- * @returns APR_SUCCESS on a successfull push
- */
- APU_DECLARE(apr_status_t) apr_queue_trypush(apr_queue_t *queue, void *data);
-
- /**
- * pop/get an object to the queue, returning immediatly if the queue is empty
- *
- * @param queue the queue
- * @param data the data
- * @returns APR_EINTR the blocking operation was interrupted (try again)
- * @returns APR_EAGAIN the queue is empty
- * @returns APR_EOF the queue has been terminated
- * @returns APR_SUCCESS on a successfull push
- */
- APU_DECLARE(apr_status_t) apr_queue_trypop(apr_queue_t *queue, void **data);
-
- /**
- * returns the size of the queue.
- *
- * @warning this is not threadsafe, and is intended for reporting/monitoring
- * of the queue.
- * @param queue the queue
- * @returns the size of the queue
- */
- APU_DECLARE(unsigned int) apr_queue_size(apr_queue_t *queue);
-
- /**
- * interrupt all the threads blocking on this queue.
- *
- * @param queue the queue
- */
- APU_DECLARE(apr_status_t) apr_queue_interrupt_all(apr_queue_t *queue);
-
- /**
- * terminate all queue, sendinging a interupt to all the
- * blocking threads
- *
- * @param queue the queue
- */
- APU_DECLARE(apr_status_t) apr_queue_term(apr_queue_t *queue);
-
- #ifdef __cplusplus
- }
- #endif
-
- /** @} */
-
- #endif /* APR_HAS_THREADS */
-
- #endif /* APRQUEUE_H */
-