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/*
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* Copyright (c) 2010, Mentor Graphics Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of the <ORGANIZATION> nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <openmcapi.h>
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/*************************************************************************
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*
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* FUNCTION
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*
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* mcapi_data_available
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*
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* DESCRIPTION
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*
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* Non-blocking API routine to check for data on an endpoint.
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*
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* INPUTS
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*
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* *rx_endp_ptr A pointer to the endpoint being checked
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* for data.
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* type The type of channel; packet or scalar.
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* *msg_count A pointer to the number of receive calls
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* that will complete without blocking.
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* *mcapi_status A pointer to memory that will be filled in
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* with the status of the call.
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*
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* OUTPUTS
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*
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* The number of receive operations that are guaranteed to not block
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* waiting for incoming data.
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*
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*************************************************************************/
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void mcapi_data_available(MCAPI_ENDPOINT *rx_endp_ptr, mcapi_uint32_t type,
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mcapi_uint_t *msg_count,
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mcapi_status_t *mcapi_status)
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{
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/* Validate the status parameter. */
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if (mcapi_status)
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{
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/* Ensure this is a receive handle. */
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if (rx_endp_ptr->mcapi_state & MCAPI_ENDP_RX)
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{
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/* Check if the endpoint is connected. */
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if (rx_endp_ptr->mcapi_state & MCAPI_ENDP_CONNECTED)
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{
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/* Ensure this is a macthing channel type. */
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if (rx_endp_ptr->mcapi_chan_type == type)
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{
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/* Count the number of packets on the channel. */
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mcapi_check_data(rx_endp_ptr, msg_count);
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/* The return value is success whether there is data
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* on the endpoint or not.
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*/
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*mcapi_status = MCAPI_SUCCESS;
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}
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/* This is a scalar channel. */
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else
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{
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*mcapi_status = MCAPI_ERR_CHAN_TYPE;
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}
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}
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/* The connection has not been made yet. */
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else
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{
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*mcapi_status = MGC_MCAPI_ERR_NOT_CONNECTED;
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}
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}
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/* Data cannot be received on a send handle. */
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else if (rx_endp_ptr->mcapi_state & MCAPI_ENDP_TX)
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{
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*mcapi_status = MCAPI_ERR_CHAN_DIRECTION;
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}
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/* The receive handle has been closed. */
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else
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{
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*mcapi_status = MCAPI_ERR_CHAN_INVALID;
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}
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}
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}
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