BOUNCE rtl@rtlinux.org: Approval required: Non-member submissionfrom ["gzeljko" <gzeljko@sezampro.yu>] (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Sat May 19 11:47:28 2001
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From: "gzeljko" <gzeljko@sezampro.yu>
To: <rtl@fsmlabs.com>
References: <OF92BE28D3.68C1072A-ON88256A45.00780215@aero.org> <3AFA954A.D4BE75E0@opersys.com>
Subject: Re: [rtl] do_gettimeofday().
Date: Sat, 19 May 2001 19:42:00 +0200
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Hello,

I'm just testing RTLinux (and hardware).
Motivated with this thread I write small test program  (appended)
for uniprocessor pentium machine to know what we are talking about.

On my test machine (K6/200) it givs stable (2-3 ppm) drift cca. 160 ppm.

gzeljko


// module for testing pentium time drift

#include <linux/mc146818rtc.h>
#include <rtl.h>
#include <rtl_sched.h>
#include <time.h>
#include <pthread.h>

pthread_t print_thread_id;
char save_cmos_B;
hrtime_t htime1, htime2;

unsigned int RTC_UI_handler(unsigned int irq, struct pt_regs *regs) {
   htime2 = gethrtime();
   (void) CMOS_READ(RTC_REG_C);
   rtl_hard_enable_irq (8);
   pthread_wakeup_np(print_thread_id);
   return 0;
}

void* print_thread(void* arg){
   rtl_printf("test started\n");
   pthread_suspend_np(pthread_self());
   htime1 = htime2;
   while (1) {
      pthread_suspend_np(pthread_self());
      rtl_printf("%10d\n",htime2 - htime1 - 1000000000L);
      htime1 = htime2;
   }
}

int init_module(void){
   char ctemp;
   if (!I8253_channel2_free()) {
      conpr("can't use cmos, test interrupted\n");
      return -1;
   }
   save_cmos_B = CMOS_READ(RTC_REG_B);
   ctemp = CMOS_READ(RTC_REG_B);
   ctemp &= 0x8f;
   ctemp |=  RTC_UIE;
   CMOS_WRITE(ctemp, RTC_REG_B); 
   pthread_create (&print_thread_id, NULL, print_thread, 0);
   rtl_request_irq(8, RTC_UI_handler);
   (void) CMOS_READ(RTC_REG_C);
   rtl_hard_enable_irq (8);
   return 0;
} 

void cleanup_module(void){
   rtl_free_irq(8);
   CMOS_WRITE(save_cmos_B, RTC_REG_B);
   pthread_delete_np (print_thread_id);
}