osal.c

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/******************************************************************************
 *                *          ***                    ***
 *              ***          ***                    ***
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 * *********  **********     ***      *********     ************     *********
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 * ***             *****        ***   *******   **  **  ******         *****
 *                           t h e  r e a l t i m e  t a r g e t  e x p e r t s
 *
 * http://www.rt-labs.com
 * Copyright (C) 2009. rt-labs AB, Sweden. All rights reserved.
 *------------------------------------------------------------------------------
 * $Id: osal.c 416 2013-01-08 21:54:25Z smf.arthur $
 *------------------------------------------------------------------------------
 */

#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <ethercat_soem/osal.h>

#define USECS_PER_SEC     1000000

int osal_usleep (uint32 usec)
{
   struct timespec ts;
   ts.tv_sec = usec / USECS_PER_SEC;
   ts.tv_nsec = (usec % USECS_PER_SEC) * 1000;
   /* usleep is depricated, use nanosleep instead */
   return nanosleep(&ts, NULL);
}

int osal_gettimeofday(struct timeval *tv, struct timezone *tz)
{
   struct timespec ts;
   int return_value;
   
   /* Use clock_gettime to prevent possible live-lock.
    * Gettimeofday uses CLOCK_REALTIME that can get NTP timeadjust.
    * If this function preempts timeadjust and it uses vpage it live-locks.
    * Also when using XENOMAI, only clock_gettime is RT safe */
   return_value = clock_gettime (CLOCK_MONOTONIC, &ts), 0;
   tv->tv_sec = ts.tv_sec;
   tv->tv_usec = ts.tv_nsec / 1000;
   return return_value;
}

ec_timet osal_current_time (void)
{
   struct timeval current_time;
   ec_timet return_value;

   osal_gettimeofday (&current_time, 0);
   return_value.sec = current_time.tv_sec;
   return_value.usec = current_time.tv_usec;
   return return_value;
}

void osal_timer_start (osal_timert * self, uint32 timeout_usec)
{
   struct timeval start_time;
   struct timeval timeout;
   struct timeval stop_time;

   osal_gettimeofday (&start_time, 0);
   timeout.tv_sec = timeout_usec / USECS_PER_SEC;
   timeout.tv_usec = timeout_usec % USECS_PER_SEC;
   timeradd (&start_time, &timeout, &stop_time);

   self->stop_time.sec = stop_time.tv_sec;
   self->stop_time.usec = stop_time.tv_usec;
}

boolean osal_timer_is_expired (const osal_timert * self)
{
   struct timeval current_time;
   struct timeval stop_time;
   int is_not_yet_expired;

   osal_gettimeofday (&current_time, 0);
   stop_time.tv_sec = self->stop_time.sec;
   stop_time.tv_usec = self->stop_time.usec;
   is_not_yet_expired = timercmp (&current_time, &stop_time, <);

   return is_not_yet_expired == FALSE;
}