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/* void Shm_Poll()
*
* This routine polls to see if a packet has arrived. If one
* has it informs the executive. It is typically called from
* the clock tick interrupt service routine.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* poll.c,v 1.2 1995/05/09 20:22:57 joel Exp
*/
#include <rtems.h>
#include <rtems/sysstate.h>
#include "shm.h"
#include "clockdrv.h"
void Shm_Poll()
{
rtems_unsigned32 tmpfront;
Clock_isr( 0 ); /* invoke standard clock ISR */
/*
* Check for msgs only if we are "up"
* This avoids a race condition where we may get a clock
* interrupt before MPCI has completed its init
*/
if (_System_state_Is_up(_System_state_Get()))
{
/* enable_tracing(); */
/* ticks += 1; */
Shm_Lock( Shm_Local_receive_queue );
tmpfront = Shm_Local_receive_queue->front;
Shm_Unlock( Shm_Local_receive_queue );
if ( Shm_Convert(tmpfront) == Shm_Locked_queue_End_of_list ) return;
rtems_multiprocessing_announce();
Shm_Interrupt_count++;
}
}
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