Subversion Repositories openrisc_2011-10-31

/*  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) 1989-1999.

 *  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: poll.c,v 1.2 2001-09-27 12:01:12 chris Exp $

 */

#include <rtems.h>

#include <rtems/score/sysstate.h>

#include <rtems/libio.h>

#include "shm_driver.h"

void Shm_Poll()

{

  rtems_unsigned32 tmpfront;

  rtems_libio_ioctl_args_t args;

  /* invoke clock isr */

  args.iop = 0;

  args.command = rtems_build_name('I', 'S', 'R', ' ');

  (void) rtems_io_control(rtems_clock_major, rtems_clock_minor, &args);

  /*

   * 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()))

  {

      tmpfront = Shm_Local_receive_queue->front;

      if ( Shm_Convert(tmpfront) != Shm_Locked_queue_End_of_list )

      {

          rtems_multiprocessing_announce();

          Shm_Interrupt_count++;

      }

  }

}