/**
 * @file
 * This routine polls to see if a packet has arrived.  If one
 * has it informs the executive. It uses a Classic API Timer
 */

/*
 *  COPYRIGHT (c) 1989-2008, 2016.
 *  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.rtems.org/license/LICENSE.
 */

#include <rtems/score/sysstate.h>
#include <rtems/score/watchdogimpl.h>

#include "shm_driver.h"

static void Shm_Poll_Set_timer( Watchdog_Control *the_watchdog )
{
  Per_CPU_Control  *cpu;
  ISR_lock_Context  lock_context;

  cpu = _Watchdog_Get_CPU( the_watchdog );
  _ISR_lock_ISR_disable( &lock_context );
  _Watchdog_Per_CPU_acquire_critical( cpu, &lock_context );
  _Watchdog_Insert(
    &cpu->Watchdog.Header[ PER_CPU_WATCHDOG_TICKS ],
    the_watchdog,
    cpu->Watchdog.ticks + 1
  );
  _Watchdog_Per_CPU_release_critical( cpu, &lock_context );
  _ISR_lock_ISR_enable( &lock_context );
}

static void Shm_Poll_TSR( Watchdog_Control *the_watchdog )
{
  uint32_t tmpfront;

  /*
   *  This should NEVER happen but just in case.
   */
  if (!_System_state_Is_up(_System_state_Get()))
    return;

  tmpfront = Shm_Local_receive_queue->front;
  if ( Shm_Convert(tmpfront) != Shm_Locked_queue_End_of_list ) {
    rtems_multiprocessing_announce();
    Shm_Interrupt_count++;
  }

  Shm_Poll_Set_timer( the_watchdog );
}

static Watchdog_Control Shm_Poll_Watchdog = WATCHDOG_INITIALIZER(
  Shm_Poll_TSR
);

void Shm_install_timer(void)
{
  Shm_Poll_Set_timer( &Shm_Poll_Watchdog );
}