00001 /* 00002 * SpanDSP - a series of DSP components for telephony 00003 * 00004 * private/queue.h - simple in process message queuing 00005 * 00006 * Written by Steve Underwood <steveu@coppice.org> 00007 * 00008 * Copyright (C) 2004 Steve Underwood 00009 * 00010 * All rights reserved. 00011 * 00012 * This program is free software; you can redistribute it and/or modify 00013 * it under the terms of the GNU Lesser General Public License version 2.1, 00014 * as published by the Free Software Foundation. 00015 * 00016 * This program is distributed in the hope that it will be useful, 00017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00019 * GNU Lesser General Public License for more details. 00020 * 00021 * You should have received a copy of the GNU Lesser General Public 00022 * License along with this program; if not, write to the Free Software 00023 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00024 * 00025 * $Id: queue.h,v 1.2 2009/01/31 08:48:11 steveu Exp $ 00026 */ 00027 00028 #if !defined(_SPANDSP_PRIVATE_QUEUE_H_) 00029 #define _SPANDSP_PRIVATE_QUEUE_H_ 00030 00031 /*! 00032 Queue descriptor. This defines the working state for a single instance of 00033 a byte stream or message oriented queue. 00034 */ 00035 struct queue_state_s 00036 { 00037 /*! \brief Flags indicating the mode of the queue. */ 00038 int flags; 00039 /*! \brief The length of the data buffer. */ 00040 int len; 00041 /*! \brief The buffer input pointer. */ 00042 volatile int iptr; 00043 /*! \brief The buffer output pointer. */ 00044 volatile int optr; 00045 #if defined(SPANDSP_FULLY_DEFINE_QUEUE_STATE_T) 00046 /*! \brief The data buffer, sized at the time the structure is created. */ 00047 uint8_t data[]; 00048 #endif 00049 }; 00050 00051 #endif 00052 /*- End of file ------------------------------------------------------------*/