/* "time.c"
 * Fuctions relatingto the timer device: Timer_Open(), Timer_Close(), and
 * Timer_Post(). Timer_Post() requests the timer device to send a message
 * after the given number of seconds and microseconds.
 */
#include <exec/types.h>
#include <exec/ports.h>
#include <devices/timer.h>

#include "cycles.h"

TIMEREQ *Timer_Open(unit,tp)
ULONG unit;
PORT *tp;
{
  long error;
  TIMEREQ *tr;

  if (!tp) tp = CreatePort(0,0);
  if (!tp) return(0);

  tr = (TIMEREQ *)CreateExtIO(tp,sizeof(TIMEREQ));
  if(!tr) {
    printf("Can't create timer request\n");
    return(0);
  }
  error = OpenDevice("timer.device",unit,tr,0L);
  if (error) {
    Timer_Close(tr);
    return(0);
  }
  return(tr);
}
/* close the timer device down */
void Timer_Close(tr)
TIMEREQ *tr;
{
  PORT *tp;

  if (tr) {
    tp = tr->tr_node.io_Message.mn_ReplyPort;
    if (tp) DeletePort(tp);
    CloseDevice(tr);
    DeleteExtIO(tr,sizeof(TIMEREQ));
  }
}
/* ask the timer to reply to our message after a certain time */
void Timer_Post(tr,secs,micro)
TIMEREQ *tr;
{
  tr->tr_node.io_Command = TR_ADDREQUEST;
  tr->tr_time.tv_secs    = secs;
  tr->tr_time.tv_micro   = micro;
  SendIO(tr);
}