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/* Shm_Receive_packet
*
* This routine is the shared memory locked queue MPCI driver routine
* used to obtain a packet containing a message from this node's
* receive queue.
*
* Input parameters:
* packet - address of a pointer to a packet
*
* Output parameters:
* *(rpb->packet) - pointer to packet
* NULL if no packet currently available
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <rtems.h>
#include "shm_driver.h"
rtems_mpci_entry Shm_Receive_packet(
rtems_packet_prefix **packet
)
{
Shm_Envelope_control *ecb;
ecb = Shm_Locked_queue_Get( Shm_Local_receive_queue );
if ( ecb ) {
*(packet) = Shm_Envelope_control_to_packet_prefix_pointer( ecb );
if ( ecb->Preamble.endian != Shm_Configuration->format )
Shm_Convert_packet( *packet );
Shm_Receive_message_count++;
} else {
*(packet) = NULL;
Shm_Null_message_count++;
}
}
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