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Re: 0.94 will appear soon


From: James Courtier-Dutton
Subject: Re: 0.94 will appear soon
Date: Mon, 19 Jan 2004 15:53:59 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6b) Gecko/20031208 Thunderbird/0.4

address@hidden wrote:

* I just stumbled on this code (in 0.93), netboot/timer.c.
-----------------------------------------
unsigned long currticks(void)
{
        static unsigned long clocks_per_tick;
        unsigned long clocks_high, clocks_low;
        unsigned long currticks;
        if (!clocks_per_tick) {
                clocks_per_tick = calibrate_tsc();
                printf("clocks_per_tick = %d\n", clocks_per_tick);
        }
------------------------------------------

Shouldn't clock_per_tick be inited to zero? If so, is that fixed in
the new version?


clock_per_tick is declared as "static" but not given a constant value. But as it is "static" it is therefore automatically given a value of 0. So, it is in fact a definition, I.E. It is automatically give a value of 0 (unless specifically given a different value) the first time one calls the function containing it.

i.e. static unsigned long clocks_per_tick;
is exactly the same as
static unsigned long clocks_per_tick = 0;

So, no fix necassary.

Cheers
James




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