forked from Imagelibrary/rtems
61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* Shm_Receive_packet
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*
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* This routine is the shared memory locked queue MPCI driver routine
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* used to obtain a packet containing a message from this node's
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* receive queue.
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*
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* Input parameters:
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* packet - address of a pointer to a packet
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*
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* Output parameters:
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* *(rpb->packet) - pointer to packet
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* NULL if no packet currently available
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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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 OWNER 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 <rtems.h>
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#include "shm_driver.h"
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rtems_mpci_entry Shm_Receive_packet(
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rtems_packet_prefix **packet
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)
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{
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Shm_Envelope_control *ecb;
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ecb = Shm_Locked_queue_Get( Shm_Local_receive_queue );
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if ( ecb ) {
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*(packet) = Shm_Envelope_control_to_packet_prefix_pointer( ecb );
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if ( ecb->Preamble.endian != Shm_Configuration->format )
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Shm_Convert_packet( *packet );
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Shm_Receive_message_count++;
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} else {
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*(packet) = NULL;
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Shm_Null_message_count++;
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}
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}
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