OpenEuphoria

Re: Strange time() behaviour

• Posted by Matt Lewis <matthewwalkerlewis at gmail.com> Apr 08, 2007
• 535 views

Leonardo Cecchi wrote:
> 
> In the euphoria reference library I read that time() 
> "Return the number of seconds since some fixed point in the past.".
> 
> But, if I execute the following code:
> 
> }}}
<eucode>
> procedure test_time()
>   atom timer, exit_code
> 
>   timer=time()
>   exit_code=system_exec("sleep 2s", 2)
>   ? time()-timer
> end procedure
> 
> test_time()
> </eucode>
{{{

> 
> I obtain:
> 
> $ exu testtime.e 
> 0.0002019999999
> 
> I think the right result should be a number bigger than 2.
> Where I'm wrong?
> I'm working with Euphoria 3.0.2/Linux and the result 
> is the same with Euphoria SVN.

I get the same result.  I think this is a consequence of CLK_TICK being
obsolete.  See here for some detail:

http://www.die.net/doc/linux/man/man2/times.2.html

The relevant code is in be_machine.c:

double current_time()
/* return value for time() function */
{
#ifdef ELINUX   
    struct tms buf;
#endif  
    if (clock_frequency == 0.0) {
	/* no handler */
	return (double)
#ifdef ELINUX
	times(&buf) / clk_tck
#else
	clock() / (double)clocks_per_sec
#endif      
	 + clock_adjust;
    }
    else {
	/* our handler is installed */
	return base_time + our_clock_ticks / clock_frequency;
    }
}

Matt