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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
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* 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
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*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* 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 */
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