win32/osal.c

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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 411 2012-12-02 20:16:39Z rtlaka $
 *------------------------------------------------------------------------------
 */

#include <winsock2.h>
#include <osal.h>
#include "osal_win32.h"

static int64_t sysfrequency;
static double qpc2usec;

#define USECS_PER_SEC     1000000
  
int osal_gettimeofday (struct timeval *tv, struct timezone *tz)
{
   int64_t wintime, usecs;
   if(!sysfrequency)
   {
      QueryPerformanceFrequency((LARGE_INTEGER *)&sysfrequency);
      qpc2usec = 1000000.0 / sysfrequency;
   }
   QueryPerformanceCounter((LARGE_INTEGER *)&wintime);
   usecs = (int64_t)((double)wintime * qpc2usec);
   tv->tv_sec = (long)(usecs / 1000000);
   tv->tv_usec = (long)(usecs - (tv->tv_sec * 1000000));
   
   return 1;
}

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;
}

int osal_usleep(uint32 usec)
{
   SleepEx(usec / 1000, FALSE);
   return 1;
}